[v3,5/9] vcodec: mediatek: Add Mediatek V4L2 Video Decoder Driver

Commit Message

tiffany.lin May 30, 2016, 12:29 p.m. UTC

Add v4l2 layer decoder driver for MT8173

Signed-off-by: Tiffany Lin <[e-mail]>
---
 drivers/media/platform/mtk-vcodec/Makefile         |   10 +-
 drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.c | 1348 ++++++++++++++++++++
 drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.h |   88 ++
 .../media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c |  408 ++++++
 .../media/platform/mtk-vcodec/mtk_vcodec_dec_pm.c  |  206 +++
 .../media/platform/mtk-vcodec/mtk_vcodec_dec_pm.h  |   28 +
 drivers/media/platform/mtk-vcodec/mtk_vcodec_drv.h |   88 +-
 .../media/platform/mtk-vcodec/mtk_vcodec_intr.c    |    4 +-
 .../media/platform/mtk-vcodec/mtk_vcodec_intr.h    |    2 +-
 .../media/platform/mtk-vcodec/mtk_vcodec_util.c    |   31 +-
 .../media/platform/mtk-vcodec/mtk_vcodec_util.h    |    7 +-
 drivers/media/platform/mtk-vcodec/vdec_drv_base.h  |   56 +
 drivers/media/platform/mtk-vcodec/vdec_drv_if.c    |  107 ++
 drivers/media/platform/mtk-vcodec/vdec_drv_if.h    |  101 ++
 drivers/media/platform/mtk-vcodec/vdec_ipi_msg.h   |  103 ++
 15 files changed, 2569 insertions(+), 18 deletions(-)
 create mode 100644 drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.c
 create mode 100644 drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.h
 create mode 100644 drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c
 create mode 100644 drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_pm.c
 create mode 100644 drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_pm.h
 create mode 100644 drivers/media/platform/mtk-vcodec/vdec_drv_base.h
 create mode 100644 drivers/media/platform/mtk-vcodec/vdec_drv_if.c
 create mode 100644 drivers/media/platform/mtk-vcodec/vdec_drv_if.h
 create mode 100644 drivers/media/platform/mtk-vcodec/vdec_ipi_msg.h

Comments

Hans Verkuil July 8, 2016, 11:06 a.m. UTC | #1

On 05/30/2016 02:29 PM, Tiffany Lin wrote:
> Add v4l2 layer decoder driver for MT8173
> 
> Signed-off-by: Tiffany Lin <[e-mail]>
> ---
>  drivers/media/platform/mtk-vcodec/Makefile         |   10 +-
>  drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.c | 1348 ++++++++++++++++++++
>  drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.h |   88 ++
>  .../media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c |  408 ++++++
>  .../media/platform/mtk-vcodec/mtk_vcodec_dec_pm.c  |  206 +++
>  .../media/platform/mtk-vcodec/mtk_vcodec_dec_pm.h  |   28 +
>  drivers/media/platform/mtk-vcodec/mtk_vcodec_drv.h |   88 +-
>  .../media/platform/mtk-vcodec/mtk_vcodec_intr.c    |    4 +-
>  .../media/platform/mtk-vcodec/mtk_vcodec_intr.h    |    2 +-
>  .../media/platform/mtk-vcodec/mtk_vcodec_util.c    |   31 +-
>  .../media/platform/mtk-vcodec/mtk_vcodec_util.h    |    7 +-
>  drivers/media/platform/mtk-vcodec/vdec_drv_base.h  |   56 +
>  drivers/media/platform/mtk-vcodec/vdec_drv_if.c    |  107 ++
>  drivers/media/platform/mtk-vcodec/vdec_drv_if.h    |  101 ++
>  drivers/media/platform/mtk-vcodec/vdec_ipi_msg.h   |  103 ++
>  15 files changed, 2569 insertions(+), 18 deletions(-)
>  create mode 100644 drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.c
>  create mode 100644 drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.h
>  create mode 100644 drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c
>  create mode 100644 drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_pm.c
>  create mode 100644 drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_pm.h
>  create mode 100644 drivers/media/platform/mtk-vcodec/vdec_drv_base.h
>  create mode 100644 drivers/media/platform/mtk-vcodec/vdec_drv_if.c
>  create mode 100644 drivers/media/platform/mtk-vcodec/vdec_drv_if.h
>  create mode 100644 drivers/media/platform/mtk-vcodec/vdec_ipi_msg.h
> 
> diff --git a/drivers/media/platform/mtk-vcodec/Makefile b/drivers/media/platform/mtk-vcodec/Makefile
> index dc5cb00..4c8ed2f 100644
> --- a/drivers/media/platform/mtk-vcodec/Makefile
> +++ b/drivers/media/platform/mtk-vcodec/Makefile
> @@ -1,7 +1,13 @@
>  
>  
> -obj-$(CONFIG_VIDEO_MEDIATEK_VCODEC) += mtk-vcodec-enc.o mtk-vcodec-common.o
> -
> +obj-$(CONFIG_VIDEO_MEDIATEK_VCODEC) += mtk-vcodec-dec.o \
> +				       mtk-vcodec-enc.o \
> +				       mtk-vcodec-common.o
> +
> +mtk-vcodec-dec-y := mtk_vcodec_dec_drv.o \
> +		vdec_drv_if.o \
> +		mtk_vcodec_dec.o \
> +		mtk_vcodec_dec_pm.o \
>  
>  
>  mtk-vcodec-enc-y := venc/venc_vp8_if.o \
> diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.c b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.c
> new file mode 100644
> index 0000000..792858a
> --- /dev/null
> +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.c
> @@ -0,0 +1,1348 @@
> +/*
> +* Copyright (c) 2016 MediaTek Inc.
> +* Author: PC Chen <[e-mail]>
> +*         Tiffany Lin <[e-mail]>
> +*
> +* This program is free software; you can redistribute it and/or modify
> +* it under the terms of the GNU General Public License version 2 as
> +* published by the Free Software Foundation.
> +*
> +* This program is distributed in the hope that it will be useful,
> +* but WITHOUT ANY WARRANTY; without even the implied warranty of
> +* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> +* GNU General Public License for more details.
> +*/
> +
> +#include <media/v4l2-event.h>
> +#include <media/v4l2-mem2mem.h>
> +#include <media/videobuf2-dma-contig.h>
> +
> +#include "mtk_vcodec_drv.h"
> +#include "mtk_vcodec_dec.h"
> +#include "mtk_vcodec_intr.h"
> +#include "mtk_vcodec_util.h"
> +#include "vdec_drv_if.h"
> +#include "mtk_vcodec_dec_pm.h"
> +
> +#define OUT_FMT_IDX	0
> +#define CAP_FMT_IDX	3
> +
> +#define MTK_VDEC_MIN_W	64U
> +#define MTK_VDEC_MIN_H	64U
> +#define DFT_CFG_WIDTH	MTK_VDEC_MIN_W
> +#define DFT_CFG_HEIGHT	MTK_VDEC_MIN_H
> +
> +static struct mtk_video_fmt mtk_video_formats[] = {
> +	{
> +		.fourcc = V4L2_PIX_FMT_H264,
> +		.type = MTK_FMT_DEC,
> +		.num_planes = 1,
> +	},
> +	{
> +		.fourcc = V4L2_PIX_FMT_VP8,
> +		.type = MTK_FMT_DEC,
> +		.num_planes = 1,
> +	},
> +	{
> +		.fourcc = V4L2_PIX_FMT_VP9,
> +		.type = MTK_FMT_DEC,
> +		.num_planes = 1,
> +	},
> +	{
> +		.fourcc = V4L2_PIX_FMT_MT21,
> +		.type = MTK_FMT_FRAME,
> +		.num_planes = 2,
> +	},
> +};
> +
> +static const struct mtk_codec_framesizes mtk_vdec_framesizes[] = {
> +	{
> +		.fourcc	= V4L2_PIX_FMT_H264,
> +		.stepwise = {  MTK_VDEC_MIN_W, MTK_VDEC_MAX_W, 16,
> +				MTK_VDEC_MIN_H, MTK_VDEC_MAX_H, 16 },
> +	},
> +	{
> +		.fourcc	= V4L2_PIX_FMT_VP8,
> +		.stepwise = {  MTK_VDEC_MIN_W, MTK_VDEC_MAX_W, 16,
> +				MTK_VDEC_MIN_H, MTK_VDEC_MAX_H, 16 },
> +	},
> +	{
> +		.fourcc = V4L2_PIX_FMT_VP9,
> +		.stepwise = {  MTK_VDEC_MIN_W, MTK_VDEC_MAX_W, 16,
> +				MTK_VDEC_MIN_H, MTK_VDEC_MAX_H, 16 },
> +	},
> +};
> +
> +#define NUM_SUPPORTED_FRAMESIZE ARRAY_SIZE(mtk_vdec_framesizes)
> +#define NUM_FORMATS ARRAY_SIZE(mtk_video_formats)
> +
> +static struct mtk_video_fmt *mtk_vdec_find_format(struct v4l2_format *f)
> +{
> +	struct mtk_video_fmt *fmt;
> +	unsigned int k;
> +
> +	for (k = 0; k < NUM_FORMATS; k++) {
> +		fmt = &mtk_video_formats[k];
> +		if (fmt->fourcc == f->fmt.pix_mp.pixelformat)
> +			return fmt;
> +	}
> +
> +	return NULL;
> +}
> +
> +static struct mtk_q_data *mtk_vdec_get_q_data(struct mtk_vcodec_ctx *ctx,
> +					      enum v4l2_buf_type type)
> +{
> +	if (V4L2_TYPE_IS_OUTPUT(type))
> +		return &ctx->q_data[MTK_Q_DATA_SRC];
> +
> +	return &ctx->q_data[MTK_Q_DATA_DST];
> +}
> +
> +/* This function is try to clean all display buffer, the buffer will return in

s/is try/tries/
s/buffer/buffers/ (2 times)

checkpatch should complain about this comment block format ('/*' should be on
its own line). Please run checkpatch to double check.

> + * display order.
> + * Note the buffer return from codec driver may still in driver's reference

s/buffer return/buffers returned/
s/still/still be/

> + * list.
> + */
> +static struct vb2_buffer *get_display_buffer(struct mtk_vcodec_ctx *ctx)
> +{
> +	struct vdec_fb *disp_frame_buffer = NULL;
> +	struct mtk_video_dec_buf *dstbuf;
> +
> +	mtk_v4l2_debug(3, "[%d]", ctx->id);
> +	if (vdec_if_get_param(ctx,
> +			GET_PARAM_DISP_FRAME_BUFFER,
> +			&disp_frame_buffer)) {
> +		mtk_v4l2_err("[%d]Cannot get param : GET_PARAM_DISP_FRAME_BUFFER",
> +			ctx->id);
> +		return NULL;
> +	}
> +
> +	if (disp_frame_buffer == NULL) {
> +		mtk_v4l2_debug(3, "No display frame buffer");
> +		return NULL;
> +	}
> +
> +	dstbuf = container_of(disp_frame_buffer, struct mtk_video_dec_buf,
> +				frame_buffer);
> +	mutex_lock(&ctx->lock);
> +	if (dstbuf->used) {
> +		vb2_set_plane_payload(&dstbuf->vb.vb2_buf, 0,
> +					ctx->picinfo.y_bs_sz);
> +		vb2_set_plane_payload(&dstbuf->vb.vb2_buf, 1,
> +					ctx->picinfo.c_bs_sz);
> +
> +		dstbuf->ready_to_display = true;
> +
> +		mtk_v4l2_debug(2,
> +				"[%d]status=%x queue id=%d to done_list %d",
> +				ctx->id, disp_frame_buffer->status,
> +				dstbuf->vb.vb2_buf.index,
> +				dstbuf->queued_in_vb2);
> +
> +		v4l2_m2m_buf_done(&dstbuf->vb, VB2_BUF_STATE_DONE);
> +		ctx->decoded_frame_cnt++;
> +	}
> +	mutex_unlock(&ctx->lock);
> +	return &dstbuf->vb.vb2_buf;
> +}
> +
> +/* This function is try to clean all capture buffers that is not used as

s/is try/tries/
s/is not/are not/

> + * reference buffer by codec driver any more

buffers

> + * In this case, we need re-queue buffer to vb2 buffer if user space
> + * already return this buffer to v4l2 or this buffer is just the output of

returns

> + * previous sps/pps/resolution change decode, or do nothing if user
> + * space still own this buffer

owns

> + */
> +static struct vb2_buffer *get_free_buffer(struct mtk_vcodec_ctx *ctx)
> +{
> +	struct mtk_video_dec_buf *dstbuf;
> +	struct vdec_fb *free_frame_buffer = NULL;
> +
> +	if (vdec_if_get_param(ctx,
> +				GET_PARAM_FREE_FRAME_BUFFER,
> +				&free_frame_buffer)) {
> +		mtk_v4l2_err("[%d] Error!! Cannot get param", ctx->id);
> +		return NULL;
> +	}
> +	if (free_frame_buffer == NULL) {
> +		mtk_v4l2_debug(3, " No free frame buffer");
> +		return NULL;
> +	}
> +
> +	mtk_v4l2_debug(3, "[%d] tmp_frame_addr = 0x%p",
> +			ctx->id, free_frame_buffer);
> +
> +	dstbuf = container_of(free_frame_buffer, struct mtk_video_dec_buf,
> +				frame_buffer);
> +
> +	mutex_lock(&ctx->lock);
> +	if (dstbuf->used) {
> +		if ((dstbuf->queued_in_vb2) &&
> +		    (dstbuf->queued_in_v4l2) &&
> +		    (free_frame_buffer->status == FB_ST_FREE)) {
> +			/* After decode sps/pps or non-display buffer, we dont

don't

> +			 * need to return capture buffer to user space, but
> +			 * just re-queue this capture buffer to vb2 queue.

> +			 * This reduce overheads that dq/q unused capture
> +			 * buffer We use queued_in_vb2 to mark this buffer
> +			 * is from decode output, not q from user space.

garbled comment. Not sure what is meant here.

> +			 */
> +			mtk_v4l2_debug(2,
> +				"[%d]status=%x queue id=%d to rdy_queue %d",
> +				ctx->id, free_frame_buffer->status,
> +				dstbuf->vb.vb2_buf.index,
> +				dstbuf->queued_in_vb2);
> +			v4l2_m2m_buf_queue(ctx->m2m_ctx, &dstbuf->vb);
> +		} else if ((dstbuf->queued_in_vb2 == false) &&
> +			   (dstbuf->queued_in_v4l2 == true)) {
> +			/* If buffer in v4l2 driver but not in vb2 queue yet,
> +			 * and we get this buffer from free_list, it means
> +			 * that codec driver do not use this buffer as
> +			 * reference buffer anymore. We should q buffer to vb2
> +			 * queue, so later work thread could get this buffer
> +			 * for decode In this sate, queued_in_vb2 = false

s/sate/case/

> +			 * menas this buffer is not from previous decode output

means

> +			 */
> +			mtk_v4l2_debug(2,
> +					"[%d]status=%x queue id=%d to rdy_queue",
> +					ctx->id, free_frame_buffer->status,
> +					dstbuf->vb.vb2_buf.index);
> +			v4l2_m2m_buf_queue(ctx->m2m_ctx, &dstbuf->vb);
> +			dstbuf->queued_in_vb2 = true;
> +		} else {
> +			/* Codec driver do not need to reference this capture
> +			 * buffer and this buffer is not in v4l2 driver.
> +			 * Then we dont need to do any thing, just add log when

don't

> +			 * we need to debug buffer flow.
> +			 * When this buffer q from user space, it could
> +			 * directly q to vb2 buffer
> +			 */
> +			mtk_v4l2_debug(3, "[%d]status=%x err queue id=%d %d %d",
> +					ctx->id, free_frame_buffer->status,
> +					dstbuf->vb.vb2_buf.index,
> +					dstbuf->queued_in_vb2,
> +					dstbuf->queued_in_v4l2);
> +		}
> +		dstbuf->used = false;
> +	}
> +	mutex_unlock(&ctx->lock);
> +	return &dstbuf->vb.vb2_buf;
> +}
> +
> +static void clean_display_buffer(struct mtk_vcodec_ctx *ctx)
> +{
> +	struct vb2_buffer *framptr;
> +
> +	do {
> +		framptr = get_display_buffer(ctx);
> +	} while (framptr);
> +}
> +
> +static void clean_free_buffer(struct mtk_vcodec_ctx *ctx)
> +{
> +	struct vb2_buffer *framptr;
> +
> +	do {
> +		framptr = get_free_buffer(ctx);
> +	} while (framptr);
> +}
> +
> +static int mtk_vdec_queue_res_chg_event(struct mtk_vcodec_ctx *ctx)

This can be a void function.

> +{
> +	static const struct v4l2_event ev_src_ch = {
> +		.type = V4L2_EVENT_SOURCE_CHANGE,
> +		.u.src_change.changes =
> +		V4L2_EVENT_SRC_CH_RESOLUTION,
> +	};
> +
> +	mtk_v4l2_debug(1, "[%d]", ctx->id);
> +	v4l2_event_queue_fh(&ctx->fh, &ev_src_ch);
> +
> +	return 0;
> +}
> +
> +static void mtk_vdec_flush_decoder(struct mtk_vcodec_ctx *ctx)
> +{
> +	bool res_chg;
> +	int ret = 0;
> +
> +	ret = vdec_if_decode(ctx, NULL, NULL, &res_chg);
> +	if (ret)
> +		mtk_v4l2_err("DecodeFinal failed, ret=%d", ret);
> +
> +	clean_display_buffer(ctx);
> +	clean_free_buffer(ctx);
> +}
> +
> +static void mtk_vdec_pic_info_update(struct mtk_vcodec_ctx *ctx)
> +{
> +	unsigned int dpbsize = 0;
> +	int ret;
> +
> +	if (vdec_if_get_param(ctx,
> +				GET_PARAM_PIC_INFO,
> +				&ctx->last_decoded_picinfo)) {
> +		mtk_v4l2_err("[%d]Error!! Cannot get param : GET_PARAM_PICTURE_INFO ERR",
> +				ctx->id);
> +		return;
> +	}
> +
> +	if (ctx->last_decoded_picinfo.pic_w == 0 ||
> +		ctx->last_decoded_picinfo.pic_h == 0 ||
> +		ctx->last_decoded_picinfo.buf_w == 0 ||
> +		ctx->last_decoded_picinfo.buf_h == 0) {
> +		mtk_v4l2_err("Cannot get correct pic info");
> +		return;
> +	}
> +
> +	if ((ctx->last_decoded_picinfo.pic_w == ctx->picinfo.pic_w) ||
> +	    (ctx->last_decoded_picinfo.pic_h == ctx->picinfo.pic_h))
> +		return;
> +
> +	mtk_v4l2_debug(1,
> +			"[%d]-> new(%d,%d), old(%d,%d), real(%d,%d)",
> +			ctx->id, ctx->last_decoded_picinfo.pic_w,
> +			ctx->last_decoded_picinfo.pic_h,
> +			ctx->picinfo.pic_w, ctx->picinfo.pic_h,
> +			ctx->last_decoded_picinfo.buf_w,
> +			ctx->last_decoded_picinfo.buf_h);
> +
> +	ret = vdec_if_get_param(ctx, GET_PARAM_DPB_SIZE, &dpbsize);
> +	if (dpbsize == 0)
> +		mtk_v4l2_err("Incorrect dpb size, ret=%d", ret);
> +
> +	ctx->dpb_size = dpbsize;
> +}
> +
> +static void mtk_vdec_worker(struct work_struct *work)
> +{
> +	struct mtk_vcodec_ctx *ctx = container_of(work, struct mtk_vcodec_ctx,
> +				decode_work);
> +	struct mtk_vcodec_dev *dev = ctx->dev;
> +	struct vb2_buffer *src_buf, *dst_buf;
> +	struct mtk_vcodec_mem buf;
> +	struct vdec_fb *pfb;
> +	bool res_chg = false;
> +	int ret;
> +	struct mtk_video_dec_buf *dst_buf_info, *src_buf_info;
> +	struct vb2_v4l2_buffer *dst_vb2_v4l2, *src_vb2_v4l2;
> +
> +	src_buf = v4l2_m2m_next_src_buf(ctx->m2m_ctx);
> +	if (src_buf == NULL) {
> +		v4l2_m2m_job_finish(dev->m2m_dev_dec, ctx->m2m_ctx);
> +		mtk_v4l2_debug(1, "[%d] src_buf empty!!", ctx->id);
> +		return;
> +	}
> +
> +	dst_buf = v4l2_m2m_next_dst_buf(ctx->m2m_ctx);
> +	if (dst_buf == NULL) {
> +		v4l2_m2m_job_finish(dev->m2m_dev_dec, ctx->m2m_ctx);
> +		mtk_v4l2_debug(1, "[%d] dst_buf empty!!", ctx->id);
> +		return;
> +	}
> +
> +	src_vb2_v4l2 = container_of(src_buf, struct vb2_v4l2_buffer, vb2_buf);
> +	src_buf_info = container_of(src_vb2_v4l2, struct mtk_video_dec_buf, vb);
> +
> +	dst_vb2_v4l2 = container_of(dst_buf, struct vb2_v4l2_buffer, vb2_buf);
> +	dst_buf_info = container_of(dst_vb2_v4l2, struct mtk_video_dec_buf, vb);
> +
> +	buf.va = vb2_plane_vaddr(src_buf, 0);
> +	buf.dma_addr = vb2_dma_contig_plane_dma_addr(src_buf, 0);
> +	buf.size = (size_t)src_buf->planes[0].bytesused;
> +	if (!buf.va) {
> +		v4l2_m2m_job_finish(dev->m2m_dev_dec, ctx->m2m_ctx);
> +		mtk_v4l2_err("[%d] id=%d src_addr is NULL!!",
> +				ctx->id, src_buf->index);
> +		return;
> +	}
> +
> +	pfb = &dst_buf_info->frame_buffer;
> +	pfb->base_y.va = vb2_plane_vaddr(dst_buf, 0);
> +	pfb->base_y.dma_addr = vb2_dma_contig_plane_dma_addr(dst_buf, 0);
> +	pfb->base_y.size = ctx->picinfo.y_bs_sz + ctx->picinfo.y_len_sz;
> +
> +	pfb->base_c.va = vb2_plane_vaddr(dst_buf, 1);
> +	pfb->base_c.dma_addr = vb2_dma_contig_plane_dma_addr(dst_buf, 1);
> +	pfb->base_c.size = ctx->picinfo.c_bs_sz + ctx->picinfo.c_len_sz;
> +	pfb->status = 0;
> +	mtk_v4l2_debug(3, "===>[%d] vdec_if_decode() ===>", ctx->id);
> +	mtk_v4l2_debug(3, "[%d] Bitstream VA=%p DMA=%llx Size=0x%lx vb=%p",
> +			ctx->id, buf.va, (u64)buf.dma_addr, buf.size, src_buf);
> +
> +	mtk_v4l2_debug(3,
> +			"id=%d Framebuf  pfb=%p VA=%p Y_DMA=%llx C_DMA=%llx Size=0x%lx",
> +			dst_buf->index, pfb,
> +			pfb->base_y.va, (u64)pfb->base_y.dma_addr,
> +			(u64)pfb->base_c.dma_addr, pfb->base_y.size);
> +
> +	if (src_buf_info->lastframe) {
> +		/* update src buf status */
> +		src_buf = v4l2_m2m_src_buf_remove(ctx->m2m_ctx);
> +		src_buf_info->lastframe = false;
> +		v4l2_m2m_buf_done(&src_buf_info->vb, VB2_BUF_STATE_DONE);
> +
> +		/* update dst buf status */
> +		dst_buf = v4l2_m2m_dst_buf_remove(ctx->m2m_ctx);
> +		dst_buf_info->used = false;
> +
> +		vdec_if_decode(ctx, NULL, NULL, &res_chg);
> +		clean_display_buffer(ctx);
> +		vb2_set_plane_payload(&dst_buf_info->vb.vb2_buf, 0, 0);
> +		vb2_set_plane_payload(&dst_buf_info->vb.vb2_buf, 1, 0);
> +		v4l2_m2m_buf_done(&dst_buf_info->vb, VB2_BUF_STATE_DONE);
> +		clean_free_buffer(ctx);

Just call v4l2_m2m_job_finish(dev->m2m_dev_dec, ctx->m2m_ctx); here and return.


> +	} else {

This can now have one less TAB.

> +		dst_buf_info->vb.vb2_buf.timestamp
> +				= src_buf_info->vb.vb2_buf.timestamp;
> +		dst_buf_info->vb.timecode
> +				= src_buf_info->vb.timecode;
> +		mutex_lock(&ctx->lock);
> +		dst_buf_info->used = true;
> +		mutex_unlock(&ctx->lock);
> +		src_buf_info->used = true;
> +
> +		ret = vdec_if_decode(ctx, &buf, pfb, &res_chg);
> +
> +		if (ret) {
> +			mtk_v4l2_err(
> +				" <===[%d], src_buf[%d]%d sz=0x%zx pts=%llu dst_buf[%d] vdec_if_decode() ret=%d res_chg=%d===>",
> +				ctx->id,
> +				src_buf->index,
> +				src_buf_info->lastframe,
> +				buf.size,
> +				src_buf_info->vb.vb2_buf.timestamp,
> +				dst_buf->index,
> +				ret, res_chg);
> +			src_buf = v4l2_m2m_src_buf_remove(ctx->m2m_ctx);
> +			v4l2_m2m_buf_done(&src_buf_info->vb,
> +					VB2_BUF_STATE_ERROR);
> +		} else if (res_chg == false) {
> +			/* we only return src buffer with VB2_BUF_STATE_DONE
> +			  * when decode success without resolution change
> +			  */
> +			src_buf = v4l2_m2m_src_buf_remove(ctx->m2m_ctx);
> +			v4l2_m2m_buf_done(&src_buf_info->vb,
> +					VB2_BUF_STATE_DONE);
> +		}
> +
> +		dst_buf = v4l2_m2m_dst_buf_remove(ctx->m2m_ctx);
> +		clean_display_buffer(ctx);
> +		clean_free_buffer(ctx);
> +
> +		if (!ret && res_chg) {
> +			mtk_vdec_pic_info_update(ctx);
> +			/*
> +			 * On encountering a resolution change in the stream.
> +			 * The driver must first process and decode all
> +			 * remaining buffers from before the resolution change
> +			 * point, so call flush decode here
> +			 */
> +			mtk_vdec_flush_decoder(ctx);
> +			/*
> +			 * After all buffers containing decoded frames from
> +			 * before the resolution change point ready to be
> +			 * dequeued on the CAPTURE queue, the driver sends a
> +			 * V4L2_EVENT_SOURCE_CHANGE event for source change
> +			 * type V4L2_EVENT_SRC_CH_RESOLUTION
> +			 */
> +			mtk_vdec_queue_res_chg_event(ctx);
> +		}
> +	}
> +
> +	v4l2_m2m_job_finish(dev->m2m_dev_dec, ctx->m2m_ctx);
> +}
> +
> +void mtk_vdec_unlock(struct mtk_vcodec_ctx *ctx)
> +{
> +	mutex_unlock(&ctx->dev->dec_mutex);
> +}
> +
> +void mtk_vdec_lock(struct mtk_vcodec_ctx *ctx)
> +{
> +	mutex_lock(&ctx->dev->dec_mutex);
> +}
> +
> +void mtk_vcodec_vdec_release(struct mtk_vcodec_ctx *ctx)
> +{
> +	vdec_if_deinit(ctx);
> +	ctx->state = MTK_STATE_FREE;
> +}
> +
> +void mtk_vcodec_dec_set_default_params(struct mtk_vcodec_ctx *ctx)
> +{
> +	struct mtk_q_data *q_data;
> +
> +	ctx->m2m_ctx->q_lock = &ctx->dev->dev_mutex;
> +	ctx->fh.m2m_ctx = ctx->m2m_ctx;
> +	ctx->fh.ctrl_handler = &ctx->ctrl_hdl;
> +	INIT_WORK(&ctx->decode_work, mtk_vdec_worker);
> +	ctx->colorspace = V4L2_COLORSPACE_REC709;
> +	ctx->ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT;
> +	ctx->quantization = V4L2_QUANTIZATION_DEFAULT;
> +	ctx->xfer_func = V4L2_XFER_FUNC_DEFAULT;
> +
> +	q_data = &ctx->q_data[MTK_Q_DATA_SRC];
> +	memset(q_data, 0, sizeof(struct mtk_q_data));
> +	q_data->visible_width = DFT_CFG_WIDTH;
> +	q_data->visible_height = DFT_CFG_HEIGHT;
> +	q_data->fmt = &mtk_video_formats[OUT_FMT_IDX];
> +	q_data->field = V4L2_FIELD_NONE;
> +
> +	ctx->q_data[MTK_Q_DATA_DST].sizeimage[0] =
> +		DFT_CFG_WIDTH * DFT_CFG_HEIGHT;
> +	ctx->q_data[MTK_Q_DATA_DST].bytesperline[0] = 0;
> +
> +	q_data = &ctx->q_data[MTK_Q_DATA_DST];
> +	memset(q_data, 0, sizeof(struct mtk_q_data));
> +	q_data->visible_width = DFT_CFG_WIDTH;
> +	q_data->visible_height = DFT_CFG_HEIGHT;
> +	q_data->coded_width = DFT_CFG_WIDTH;
> +	q_data->coded_height = DFT_CFG_HEIGHT;
> +	q_data->fmt = &mtk_video_formats[CAP_FMT_IDX];
> +	q_data->field = V4L2_FIELD_NONE;
> +
> +	v4l_bound_align_image(&q_data->coded_width,
> +				MTK_VDEC_MIN_W,
> +				MTK_VDEC_MAX_W, 4,
> +				&q_data->coded_height,
> +				MTK_VDEC_MIN_H,
> +				MTK_VDEC_MAX_H, 5, 6);
> +
> +	q_data->sizeimage[0] = q_data->coded_width * q_data->coded_height;
> +	q_data->bytesperline[0] = q_data->coded_width;
> +	q_data->sizeimage[1] = q_data->sizeimage[0] / 2;
> +	q_data->bytesperline[1] = q_data->coded_width;
> +}
> +
> +static int vidioc_vdec_qbuf(struct file *file, void *priv,
> +			    struct v4l2_buffer *buf)
> +{
> +	struct mtk_vcodec_ctx *ctx = fh_to_ctx(priv);
> +	struct vb2_queue *vq;
> +	struct vb2_buffer *vb;
> +	struct mtk_video_dec_buf *mtkbuf;
> +	struct vb2_v4l2_buffer	*vb2_v4l2;
> +
> +	if (ctx->state == MTK_STATE_ABORT) {
> +		mtk_v4l2_err("[%d] Call on QBUF after unrecoverable error",
> +				ctx->id);
> +		return -EIO;
> +	}
> +
> +	vq = v4l2_m2m_get_vq(ctx->m2m_ctx, buf->type);
> +	vb = vq->bufs[buf->index];
> +	vb2_v4l2 = container_of(vb, struct vb2_v4l2_buffer, vb2_buf);
> +	mtkbuf = container_of(vb2_v4l2, struct mtk_video_dec_buf, vb);
> +
> +	if ((buf->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) &&
> +	    (buf->m.planes[0].bytesused == 0)) {
> +		mtkbuf->lastframe = true;
> +		mtk_v4l2_debug(1, "[%d] (%d) id=%d lastframe=%d (%d,%d, %d) vb=%p",
> +			 ctx->id, buf->type, buf->index,
> +			 mtkbuf->lastframe, buf->bytesused,
> +			 buf->m.planes[0].bytesused, buf->length,
> +			 vb);
> +	}
> +
> +	return v4l2_m2m_qbuf(file, ctx->m2m_ctx, buf);
> +}
> +
> +static int vidioc_vdec_dqbuf(struct file *file, void *priv,
> +			     struct v4l2_buffer *buf)
> +{
> +	struct mtk_vcodec_ctx *ctx = fh_to_ctx(priv);
> +
> +	if (ctx->state == MTK_STATE_ABORT) {
> +		mtk_v4l2_err("[%d] Call on DQBUF after unrecoverable error",
> +				ctx->id);
> +		return -EIO;
> +	}
> +
> +	return v4l2_m2m_dqbuf(file, ctx->m2m_ctx, buf);
> +}
> +
> +static int vidioc_vdec_querycap(struct file *file, void *priv,
> +				struct v4l2_capability *cap)
> +{
> +	strlcpy(cap->driver, MTK_VCODEC_DEC_NAME, sizeof(cap->driver));
> +	strlcpy(cap->bus_info, MTK_PLATFORM_STR, sizeof(cap->bus_info));
> +	strlcpy(cap->card, MTK_PLATFORM_STR, sizeof(cap->card));
> +
> +	return 0;
> +}
> +
> +static int vidioc_vdec_subscribe_evt(struct v4l2_fh *fh,
> +				     const struct v4l2_event_subscription *sub)
> +{
> +	switch (sub->type) {
> +	case V4L2_EVENT_EOS:
> +		return v4l2_event_subscribe(fh, sub, 2, NULL);
> +	case V4L2_EVENT_SOURCE_CHANGE:
> +		return v4l2_src_change_event_subscribe(fh, sub);
> +	default:
> +		return v4l2_ctrl_subscribe_event(fh, sub);
> +	}
> +}
> +
> +static int vidioc_try_fmt_vid_cap_mplane(struct file *file, void *priv,
> +				struct v4l2_format *f)
> +{
> +	struct mtk_video_fmt *fmt;
> +
> +	fmt = mtk_vdec_find_format(f);
> +	if (!fmt) {
> +		f->fmt.pix.pixelformat = mtk_video_formats[CAP_FMT_IDX].fourcc;
> +		fmt = mtk_vdec_find_format(f);
> +	}
> +
> +	return 0;
> +}
> +
> +static int vidioc_try_fmt_vid_out_mplane(struct file *file, void *priv,
> +				struct v4l2_format *f)
> +{
> +	struct v4l2_pix_format_mplane *pix_fmt_mp = &f->fmt.pix_mp;
> +	struct mtk_video_fmt *fmt;
> +
> +	fmt = mtk_vdec_find_format(f);
> +	if (!fmt) {
> +		f->fmt.pix.pixelformat = mtk_video_formats[OUT_FMT_IDX].fourcc;
> +		fmt = mtk_vdec_find_format(f);
> +	}
> +
> +	if (pix_fmt_mp->plane_fmt[0].sizeimage == 0) {
> +		mtk_v4l2_err("sizeimage of output format must be given");
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}
> +
> +static int vidioc_vdec_g_selection(struct file *file, void *priv,
> +			struct v4l2_selection *s)
> +{
> +	struct mtk_vcodec_ctx *ctx = fh_to_ctx(priv);
> +
> +	if (V4L2_TYPE_IS_OUTPUT(s->type))
> +		return -EINVAL;
> +
> +	if (s->target != V4L2_SEL_TGT_CROP)
> +		return -EINVAL;

How does the cropping rectangle relate to the format size? There is no s_selection,
so this doesn't make sense.

Alternatively, it could be that you are really returning V4L2_SEL_TGT_COMPOSE_PADDED.

> +
> +	if (ctx->state < MTK_STATE_HEADER)
> +		return -EINVAL;
> +
> +	if ((ctx->q_data[MTK_Q_DATA_SRC].fmt->fourcc == V4L2_PIX_FMT_H264) ||
> +	    (ctx->q_data[MTK_Q_DATA_SRC].fmt->fourcc == V4L2_PIX_FMT_VP8) ||
> +	    (ctx->q_data[MTK_Q_DATA_SRC].fmt->fourcc == V4L2_PIX_FMT_VP9)) {
> +
> +		if (vdec_if_get_param(ctx, GET_PARAM_CROP_INFO, &(s->r))) {
> +			mtk_v4l2_debug(2,
> +					"[%d]Error!! Cannot get param : GET_PARAM_CROP_INFO ERR",
> +					ctx->id);
> +			s->r.left = 0;
> +			s->r.top = 0;
> +			s->r.width = ctx->picinfo.buf_w;
> +			s->r.height = ctx->picinfo.buf_h;
> +		}
> +		mtk_v4l2_debug(2, "Cropping info: l=%d t=%d w=%d h=%d",
> +				s->r.left, s->r.top, s->r.width,
> +				s->r.height);
> +	} else {
> +		s->r.left = 0;
> +		s->r.top = 0;
> +		s->r.width = ctx->picinfo.pic_w;
> +		s->r.height = ctx->picinfo.pic_h;
> +		mtk_v4l2_debug(2, "Cropping info: w=%d h=%d fw=%d fh=%d",
> +				s->r.width, s->r.height, ctx->picinfo.buf_w,
> +				ctx->picinfo.buf_h);
> +	}
> +	return 0;
> +}
> +
> +static int vidioc_vdec_s_fmt(struct file *file, void *priv,
> +			     struct v4l2_format *f)
> +{
> +	struct mtk_vcodec_ctx *ctx = fh_to_ctx(priv);
> +	struct v4l2_pix_format_mplane *pix_mp;
> +	struct mtk_q_data *q_data;
> +	int ret = 0;
> +	struct mtk_video_fmt *fmt;
> +	struct vb2_queue *vq;
> +
> +	mtk_v4l2_debug(3, "[%d]", ctx->id);
> +
> +	fmt = mtk_vdec_find_format(f);
> +	if (fmt == NULL) {
> +		mtk_v4l2_err("vidioc_vdec_s_fmt fail");
> +		return ret;
> +	}
> +
> +	pix_mp = &f->fmt.pix_mp;
> +	if ((f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) &&
> +	    vb2_is_busy(&ctx->m2m_ctx->out_q_ctx.q)) {
> +		mtk_v4l2_err("out_q_ctx buffers already requested");
> +		ret = -EBUSY;
> +	}
> +
> +	if ((f->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) &&
> +	    vb2_is_busy(&ctx->m2m_ctx->cap_q_ctx.q)) {
> +		mtk_v4l2_err("cap_q_ctx buffers already requested");
> +		ret = -EBUSY;
> +	}
> +
> +	vq = v4l2_m2m_get_vq(ctx->m2m_ctx, f->type);
> +
> +	q_data = mtk_vdec_get_q_data(ctx, f->type);
> +	if (!q_data)
> +		return -EINVAL;
> +
> +	q_data->fmt = fmt;
> +	if (f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) {
> +		q_data->sizeimage[0] = pix_mp->plane_fmt[0].sizeimage;
> +		pix_mp->plane_fmt[0].bytesperline = 0;
> +		pix_mp->width = 0;
> +		pix_mp->height = 0;
> +
> +		if (ctx->state == MTK_STATE_FREE) {
> +			ret = vdec_if_init(ctx, q_data->fmt->fourcc);
> +			if (ret) {
> +				mtk_v4l2_err("[%d]: vdec_if_init() fail ret=%d",
> +					ctx->id, ret);
> +				return -EINVAL;
> +			}
> +			ctx->state = MTK_STATE_INIT;
> +		}
> +	}
> +
> +	return 0;
> +}
> +
> +static int vidioc_enum_framesizes(struct file *file, void *priv,
> +				struct v4l2_frmsizeenum *fsize)
> +{
> +	int i = 0;
> +	struct mtk_vcodec_ctx *ctx = fh_to_ctx(priv);
> +
> +	if (fsize->index != 0)
> +		return -EINVAL;
> +
> +	for (i = 0; i < NUM_SUPPORTED_FRAMESIZE; ++i) {
> +		if (fsize->pixel_format != mtk_vdec_framesizes[i].fourcc)
> +			continue;
> +
> +		fsize->type = V4L2_FRMSIZE_TYPE_STEPWISE;
> +		fsize->stepwise = mtk_vdec_framesizes[i].stepwise;
> +		if (!(ctx->dev->dec_capability &
> +				VCODEC_CAPABILITY_4K_DISABLED)) {
> +			mtk_v4l2_debug(3, "4K is enabled");
> +			fsize->stepwise.max_width =
> +					VCODEC_DEC_4K_CODED_WIDTH;
> +			fsize->stepwise.max_height =
> +					VCODEC_DEC_4K_CODED_HEIGHT;
> +		}
> +		mtk_v4l2_debug(1, "%x, %d %d %d %d %d %d",
> +				ctx->dev->dec_capability,
> +				fsize->stepwise.min_width,
> +				fsize->stepwise.max_width,
> +				fsize->stepwise.step_width,
> +				fsize->stepwise.min_height,
> +				fsize->stepwise.max_height,
> +				fsize->stepwise.step_height);
> +		return 0;
> +	}
> +
> +	return -EINVAL;
> +}
> +
> +static int vidioc_enum_fmt(struct v4l2_fmtdesc *f, bool output_queue)
> +{
> +	struct mtk_video_fmt *fmt;
> +	int i, j = 0;
> +
> +	for (i = 0; i < NUM_FORMATS; i++) {
> +		if (output_queue && (mtk_video_formats[i].type != MTK_FMT_DEC))
> +			continue;
> +		if (!output_queue &&
> +			(mtk_video_formats[i].type != MTK_FMT_FRAME))
> +			continue;
> +
> +		if (j == f->index)
> +			break;
> +		++j;
> +	}
> +
> +	if (i == NUM_FORMATS)
> +		return -EINVAL;
> +
> +	fmt = &mtk_video_formats[i];
> +	f->pixelformat = fmt->fourcc;
> +
> +	return 0;
> +}
> +
> +static int vidioc_vdec_enum_fmt_vid_cap_mplane(struct file *file, void *pirv,
> +					       struct v4l2_fmtdesc *f)
> +{
> +	return vidioc_enum_fmt(f, false);
> +}
> +
> +static int vidioc_vdec_enum_fmt_vid_out_mplane(struct file *file, void *priv,
> +					       struct v4l2_fmtdesc *f)
> +{
> +	return vidioc_enum_fmt(f, true);
> +}
> +
> +static int vidioc_vdec_g_fmt(struct file *file, void *priv,
> +			     struct v4l2_format *f)
> +{
> +	struct mtk_vcodec_ctx *ctx = fh_to_ctx(priv);
> +	struct v4l2_pix_format_mplane *pix_mp = &f->fmt.pix_mp;
> +	struct vb2_queue *vq;
> +	struct mtk_q_data *q_data;
> +
> +	vq = v4l2_m2m_get_vq(ctx->m2m_ctx, f->type);
> +	if (!vq) {
> +		mtk_v4l2_err("no vb2 queue for type=%d",
> +			f->type);
> +		return -EINVAL;
> +	}
> +
> +	q_data = mtk_vdec_get_q_data(ctx, f->type);
> +
> +	if ((f->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) &&
> +	    (ctx->state >= MTK_STATE_HEADER)) {
> +		/* Until STREAMOFF is called on the CAPTURE queue
> +		 * (acknowledging the event), the driver operates as if
> +		 * the resolution hasn't changed yet.
> +		 * So we just return picinfo yet, and update picinfo in
> +		 * stop_streaming hook function
> +		 */
> +		q_data->sizeimage[0] = ctx->picinfo.y_bs_sz +
> +					ctx->picinfo.y_len_sz;
> +		q_data->sizeimage[1] = ctx->picinfo.c_bs_sz +
> +					ctx->picinfo.c_len_sz;
> +		q_data->bytesperline[0] = ctx->last_decoded_picinfo.buf_w;
> +		q_data->bytesperline[1] = ctx->last_decoded_picinfo.buf_w;
> +		q_data->coded_width = ctx->picinfo.buf_w;
> +		q_data->coded_height = ctx->picinfo.buf_h;
> +
> +		/*
> +		 * Width and height are set to the dimensions
> +		 * of the movie, the buffer is bigger and
> +		 * further processing stages should crop to this
> +		 * rectangle.
> +		 */
> +		pix_mp->width = q_data->coded_width;
> +		pix_mp->height = q_data->coded_height;
> +		pix_mp->field = V4L2_FIELD_NONE;
> +
> +		/*
> +		 * Set pixelformat to the format in which mt vcodec
> +		 * outputs the decoded frame
> +		 */
> +		pix_mp->num_planes = q_data->fmt->num_planes;
> +		pix_mp->pixelformat = q_data->fmt->fourcc;
> +		pix_mp->plane_fmt[0].bytesperline = q_data->bytesperline[0];
> +		pix_mp->plane_fmt[0].sizeimage = q_data->sizeimage[0];
> +		pix_mp->plane_fmt[1].bytesperline = q_data->bytesperline[1];
> +		pix_mp->plane_fmt[1].sizeimage = q_data->sizeimage[1];
> +
> +	} else if (f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) {
> +		/*
> +		 * This is run on OUTPUT
> +		 * The buffer contains compressed image
> +		 * so width and height have no meaning.
> +		 * Assign value here to pass v4l2-compliance test
> +		 */
> +		pix_mp->width = q_data->visible_width;
> +		pix_mp->height = q_data->visible_height;
> +		pix_mp->field = V4L2_FIELD_NONE;
> +		pix_mp->plane_fmt[0].bytesperline = q_data->bytesperline[0];
> +		pix_mp->plane_fmt[0].sizeimage = q_data->sizeimage[0];
> +		pix_mp->pixelformat = q_data->fmt->fourcc;
> +		pix_mp->num_planes = q_data->fmt->num_planes;
> +	} else {
> +		pix_mp->width = q_data->coded_width;
> +		pix_mp->height = q_data->coded_height;
> +		pix_mp->field = V4L2_FIELD_NONE;
> +		pix_mp->num_planes = q_data->fmt->num_planes;
> +		pix_mp->pixelformat = q_data->fmt->fourcc;
> +		pix_mp->plane_fmt[0].bytesperline = q_data->bytesperline[0];
> +		pix_mp->plane_fmt[0].sizeimage = q_data->sizeimage[0];
> +		pix_mp->plane_fmt[1].bytesperline = q_data->bytesperline[1];
> +		pix_mp->plane_fmt[1].sizeimage = q_data->sizeimage[1];
> +
> +		mtk_v4l2_debug(1, "[%d] state=%d Format could not be read %d, not ready yet!",
> +				ctx->id, ctx->state, f->type);
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}
> +
> +static int vb2ops_vdec_queue_setup(struct vb2_queue *vq,
> +				unsigned int *nbuffers,
> +				unsigned int *nplanes,
> +				unsigned int sizes[], void *alloc_ctxs[])
> +{
> +	struct mtk_vcodec_ctx *ctx = vb2_get_drv_priv(vq);
> +	struct mtk_q_data *q_data;
> +	unsigned int i;
> +
> +	q_data = mtk_vdec_get_q_data(ctx, vq->type);
> +
> +	if (q_data == NULL) {
> +		mtk_v4l2_err("vq->type=%d err\n", vq->type);
> +		return -EINVAL;
> +	}
> +
> +	if (*nplanes) {
> +		for (i = 0; i < *nplanes; i++) {
> +			if (sizes[i] < q_data->sizeimage[i])
> +				return -EINVAL;
> +			alloc_ctxs[i] = ctx->dev->alloc_ctx;
> +		}
> +	} else {
> +
> +		if (vq->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) {
> +			if (ctx->state < MTK_STATE_HEADER) {
> +				mtk_v4l2_err("State not ready");
> +				return -EINVAL;
> +			}
> +			/*
> +			 * Output plane count is 2 - one for Y and one for CbCr
> +			 */
> +			*nplanes = 2;
> +		} else {
> +			*nplanes = 1;
> +		}
> +
> +		for (i = 0; i < *nplanes; i++) {
> +			sizes[i] = q_data->sizeimage[i];
> +			alloc_ctxs[i] = ctx->dev->alloc_ctx;
> +		}
> +	}
> +
> +	mtk_v4l2_debug(1,
> +			"[%d]\t type = %d, get %d plane(s), %d buffer(s) of size 0x%x 0x%x ",
> +			ctx->id, vq->type, *nplanes, *nbuffers,
> +			sizes[0], sizes[1]);
> +
> +	return 0;
> +}
> +
> +static int vb2ops_vdec_buf_prepare(struct vb2_buffer *vb)
> +{
> +	struct mtk_vcodec_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
> +	struct mtk_q_data *q_data;
> +	int i;
> +
> +	mtk_v4l2_debug(3, "[%d] (%d) id=%d",
> +			ctx->id, vb->vb2_queue->type, vb->index);
> +
> +	q_data = mtk_vdec_get_q_data(ctx, vb->vb2_queue->type);
> +
> +	for (i = 0; i < q_data->fmt->num_planes; i++) {
> +		if (vb2_plane_size(vb, i) > q_data->sizeimage[i]) {

Shouldn't this be < instead of > ?

> +			mtk_v4l2_err("data will not fit into plane %d (%lu < %d)",
> +				i, vb2_plane_size(vb, i),
> +				q_data->sizeimage[i]);
> +		}
> +	}
> +
> +	return 0;
> +}
> +
> +static void vb2ops_vdec_buf_queue(struct vb2_buffer *vb)
> +{
> +	struct mtk_vcodec_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
> +	struct vb2_v4l2_buffer *vb2_v4l2 = container_of(vb,
> +				struct vb2_v4l2_buffer, vb2_buf);
> +	struct mtk_video_dec_buf *buf = container_of(vb2_v4l2,
> +				struct mtk_video_dec_buf, vb);
> +
> +	mtk_v4l2_debug(3, "[%d] (%d) id=%d, vb=%p",
> +			ctx->id, vb->vb2_queue->type,
> +			vb->index, vb);
> +	/*
> +	 * check if this buffer is ready to be used after decode
> +	 */
> +	if (vb->vb2_queue->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) {

Do the 'else' part first and return there.

Then this can be shifted one TAB to the left.

> +		struct vb2_buffer *src_buf;
> +		struct mtk_vcodec_mem src_mem;
> +		bool res_chg = false;
> +		int ret = 0;
> +		unsigned int dpbsize = 1;
> +
> +		v4l2_m2m_buf_queue(ctx->m2m_ctx, vb2_v4l2);
> +
> +		if (ctx->state == MTK_STATE_INIT) {

Ditto.

> +			src_buf = v4l2_m2m_next_src_buf(ctx->m2m_ctx);
> +			if (!src_buf) {
> +				mtk_v4l2_err("No src buffer");
> +				return;
> +			}
> +
> +			src_mem.va	= vb2_plane_vaddr(src_buf, 0);
> +			src_mem.dma_addr = vb2_dma_contig_plane_dma_addr(
> +						src_buf,
> +						0);
> +			src_mem.size = (size_t)src_buf->planes[0].bytesused;
> +			mtk_v4l2_debug(2,
> +					"[%d] buf id=%d va=%p dma=%llx size=%zu",
> +					ctx->id, src_buf->index,
> +					src_mem.va, (u64)src_mem.dma_addr,
> +					src_mem.size);
> +
> +			ret = vdec_if_decode(ctx, &src_mem, NULL, &res_chg);
> +			if (ret) {
> +				/* fb == NULL menas to parse SPS/PPS header or
> +				 * resolution info in src_mem. Decode can fail
> +				 * if there is no SPS header or picture info
> +				 * in bs
> +				 */
> +				src_buf = v4l2_m2m_src_buf_remove(ctx->m2m_ctx);
> +				v4l2_m2m_buf_done(to_vb2_v4l2_buffer(src_buf),
> +						VB2_BUF_STATE_DONE);
> +				mtk_v4l2_debug(0, "[%d] vdec_if_decode() src_buf=%d, size=%zu, fail=%d",
> +						ctx->id, src_buf->index,
> +						src_mem.size, ret);
> +				return;
> +			}
> +
> +			if (vdec_if_get_param(ctx,
> +						GET_PARAM_PIC_INFO,
> +						&ctx->picinfo)) {
> +				mtk_v4l2_err("[%d]Error!! Cannot get param : GET_PARAM_PICTURE_INFO ERR",
> +						ctx->id);
> +				return;
> +			}
> +
> +			ctx->last_decoded_picinfo = ctx->picinfo;
> +			ctx->q_data[MTK_Q_DATA_DST].sizeimage[0] =
> +						ctx->picinfo.y_bs_sz +
> +						ctx->picinfo.y_len_sz;
> +			ctx->q_data[MTK_Q_DATA_DST].bytesperline[0] =
> +						ctx->picinfo.buf_w;
> +			ctx->q_data[MTK_Q_DATA_DST].sizeimage[1] =
> +						ctx->picinfo.c_bs_sz +
> +						ctx->picinfo.c_len_sz;
> +			ctx->q_data[MTK_Q_DATA_DST].bytesperline[1] =
> +						ctx->picinfo.buf_w;
> +			mtk_v4l2_debug(2, "[%d] vdec_if_init() OK wxh=%dx%d pic wxh=%dx%d sz[0]=0x%x sz[1]=0x%x",
> +				ctx->id,
> +				ctx->picinfo.buf_w, ctx->picinfo.buf_h,
> +				ctx->picinfo.pic_w, ctx->picinfo.pic_h,
> +				ctx->q_data[MTK_Q_DATA_DST].sizeimage[0],
> +				ctx->q_data[MTK_Q_DATA_DST].sizeimage[1]);
> +
> +			ret = vdec_if_get_param(ctx, GET_PARAM_DPB_SIZE,
> +						&dpbsize);
> +			if (dpbsize == 0) {
> +				mtk_v4l2_err("[%d] vdec_if_get_param()  GET_PARAM_DPB_SIZE fail=%d",
> +						ctx->id, ret);
> +			}
> +			ctx->dpb_size = dpbsize;
> +			ctx->state = MTK_STATE_HEADER;
> +			mtk_v4l2_debug(1, "[%d] dpbsize=%d", ctx->id,
> +					ctx->dpb_size);
> +		} else {
> +			mtk_v4l2_debug(3, "[%d] already init driver %d",
> +					ctx->id, ctx->state);
> +		}
> +	} else {
> +		mutex_lock(&ctx->lock);
> +		if (buf->used == false) {
> +			v4l2_m2m_buf_queue(ctx->m2m_ctx,
> +					to_vb2_v4l2_buffer(vb));
> +			buf->queued_in_vb2 = true;
> +			buf->queued_in_v4l2 = true;
> +			buf->ready_to_display = false;
> +		} else {
> +			buf->queued_in_vb2 = false;
> +			buf->queued_in_v4l2 = true;
> +			buf->ready_to_display = false;
> +		}
> +		mutex_unlock(&ctx->lock);
> +	}
> +}
> +
> +static void vb2ops_vdec_buf_finish(struct vb2_buffer *vb)
> +{
> +	struct mtk_vcodec_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
> +
> +	if (vb->vb2_queue->type ==
> +		V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) {

Place this on one line.

Actually, just invert the condition and return. The remainder can then be shifted
one TAB to the left.

> +		struct vb2_v4l2_buffer *vb2_v4l2;
> +		struct mtk_video_dec_buf *buf;
> +
> +		vb2_v4l2 = container_of(vb, struct vb2_v4l2_buffer, vb2_buf);
> +		buf = container_of(vb2_v4l2, struct mtk_video_dec_buf, vb);
> +		mutex_lock(&ctx->lock);
> +		buf->queued_in_v4l2 = false;
> +		buf->queued_in_vb2 = false;
> +		mutex_unlock(&ctx->lock);
> +	}
> +}
> +
> +static int vb2ops_vdec_buf_init(struct vb2_buffer *vb)
> +{
> +	struct vb2_v4l2_buffer *vb2_v4l2 = container_of(vb,
> +					struct vb2_v4l2_buffer, vb2_buf);
> +	struct mtk_video_dec_buf *buf = container_of(vb2_v4l2,
> +					struct mtk_video_dec_buf, vb);
> +
> +	if (vb->vb2_queue->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) {
> +		buf->used = false;
> +		buf->ready_to_display = false;
> +		buf->queued_in_v4l2 = false;
> +	} else {
> +		buf->lastframe = false;
> +	}
> +
> +	return 0;
> +}
> +
> +static int vb2ops_vdec_start_streaming(struct vb2_queue *q, unsigned int count)
> +{
> +	struct mtk_vcodec_ctx *ctx = vb2_get_drv_priv(q);
> +
> +	if (ctx->state == MTK_STATE_FLUSH)
> +		ctx->state = MTK_STATE_HEADER;
> +
> +	return 0;
> +}
> +
> +static void vb2ops_vdec_stop_streaming(struct vb2_queue *q)
> +{
> +	struct vb2_buffer *src_buf = NULL, *dst_buf = NULL;
> +	struct mtk_vcodec_ctx *ctx = vb2_get_drv_priv(q);
> +
> +	mtk_v4l2_debug(3, "[%d] (%d) state=(%x) ctx->decoded_frame_cnt=%d",
> +			ctx->id, q->type, ctx->state, ctx->decoded_frame_cnt);
> +
> +	if (q->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) {
> +		while ((src_buf = v4l2_m2m_src_buf_remove(ctx->m2m_ctx)))
> +			v4l2_m2m_buf_done(to_vb2_v4l2_buffer(src_buf),
> +					VB2_BUF_STATE_ERROR);
> +

Same trick can be done here.

> +	} else if (q->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) {
> +		if (ctx->state >= MTK_STATE_HEADER) {
> +
> +			/* Until STREAMOFF is called on the CAPTURE queue
> +			 * (acknowledging the event), the driver operates
> +			 * as if the resolution hasn't changed yet, i.e.
> +			 * VIDIOC_G_FMT< etc. return previous resolution.
> +			 * So we update picinfo here
> +			 */
> +			ctx->picinfo = ctx->last_decoded_picinfo;
> +
> +			mtk_v4l2_debug(2,
> +				"[%d]-> new(%d,%d), old(%d,%d), real(%d,%d)",
> +				ctx->id, ctx->last_decoded_picinfo.pic_w,
> +				ctx->last_decoded_picinfo.pic_h,
> +				ctx->picinfo.pic_w, ctx->picinfo.pic_h,
> +				ctx->last_decoded_picinfo.buf_w,
> +				ctx->last_decoded_picinfo.buf_h);
> +
> +			mtk_vdec_flush_decoder(ctx);
> +		}
> +		ctx->state = MTK_STATE_FLUSH;
> +
> +		while ((dst_buf = v4l2_m2m_dst_buf_remove(ctx->m2m_ctx))) {
> +			vb2_set_plane_payload(dst_buf, 0, 0);
> +			vb2_set_plane_payload(dst_buf, 1, 0);
> +			v4l2_m2m_buf_done(to_vb2_v4l2_buffer(dst_buf),
> +					VB2_BUF_STATE_ERROR);
> +		}
> +	}
> +}
> +
> +static void m2mops_vdec_device_run(void *priv)
> +{
> +	struct mtk_vcodec_ctx *ctx = priv;
> +	struct mtk_vcodec_dev *dev = ctx->dev;
> +
> +	queue_work(dev->decode_workqueue, &ctx->decode_work);
> +}
> +
> +static int m2mops_vdec_job_ready(void *m2m_priv)
> +{
> +	struct mtk_vcodec_ctx *ctx = m2m_priv;
> +
> +	mtk_v4l2_debug(3, "[%d]", ctx->id);
> +
> +	if (ctx->state == MTK_STATE_ABORT)
> +		return 0;
> +
> +	if ((ctx->last_decoded_picinfo.pic_w != ctx->picinfo.pic_w) ||
> +	    (ctx->last_decoded_picinfo.pic_h != ctx->picinfo.pic_h))
> +		return 0;
> +
> +	if (ctx->state != MTK_STATE_HEADER)
> +		return 0;
> +
> +	return 1;
> +}
> +
> +static void m2mops_vdec_job_abort(void *priv)
> +{
> +	struct mtk_vcodec_ctx *ctx = priv;
> +
> +	ctx->state = MTK_STATE_ABORT;
> +}
> +
> +static int mtk_vdec_g_v_ctrl(struct v4l2_ctrl *ctrl)
> +{
> +	struct mtk_vcodec_ctx *ctx = ctrl_to_ctx(ctrl);
> +	int ret = 0;
> +
> +	switch (ctrl->id) {
> +	case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE:
> +		if (ctx->state >= MTK_STATE_HEADER) {
> +			ctrl->val = ctx->dpb_size;
> +		} else {
> +			mtk_v4l2_err("Seqinfo not ready");
> +			ctrl->val = 1;
> +			ret = -EAGAIN;
> +		}
> +		break;
> +	default:
> +		ret = -EINVAL;
> +	}
> +	return ret;
> +}
> +
> +static const struct v4l2_ctrl_ops mtk_vcodec_dec_ctrl_ops = {
> +	.g_volatile_ctrl = mtk_vdec_g_v_ctrl,
> +};
> +
> +int mtk_vcodec_dec_ctrls_setup(struct mtk_vcodec_ctx *ctx)
> +{
> +	struct v4l2_ctrl *ctrl;
> +
> +	v4l2_ctrl_handler_init(&ctx->ctrl_hdl, 1);
> +
> +	ctrl = v4l2_ctrl_new_std(&ctx->ctrl_hdl,
> +				&mtk_vcodec_dec_ctrl_ops,
> +				V4L2_CID_MIN_BUFFERS_FOR_CAPTURE,
> +				1, 32, 1, 1);
> +	ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
> +
> +	if (ctx->ctrl_hdl.error) {
> +		mtk_v4l2_err("Adding control failed %d",
> +				ctx->ctrl_hdl.error);
> +		return ctx->ctrl_hdl.error;
> +	}
> +
> +	v4l2_ctrl_handler_setup(&ctx->ctrl_hdl);
> +	return 0;
> +}
> +
> +static void m2mops_vdec_lock(void *m2m_priv)
> +{
> +	struct mtk_vcodec_ctx *ctx = m2m_priv;
> +
> +	mtk_v4l2_debug(3, "[%d]", ctx->id);
> +	mutex_lock(&ctx->dev->dev_mutex);
> +}
> +
> +static void m2mops_vdec_unlock(void *m2m_priv)
> +{
> +	struct mtk_vcodec_ctx *ctx = m2m_priv;
> +
> +	mtk_v4l2_debug(3, "[%d]", ctx->id);
> +	mutex_unlock(&ctx->dev->dev_mutex);
> +}
> +
> +const struct v4l2_m2m_ops mtk_vdec_m2m_ops = {
> +	.device_run	= m2mops_vdec_device_run,
> +	.job_ready	= m2mops_vdec_job_ready,
> +	.job_abort	= m2mops_vdec_job_abort,
> +	.lock		= m2mops_vdec_lock,
> +	.unlock		= m2mops_vdec_unlock,
> +};
> +
> +static const struct vb2_ops mtk_vdec_vb2_ops = {
> +	.queue_setup	= vb2ops_vdec_queue_setup,
> +	.buf_prepare	= vb2ops_vdec_buf_prepare,
> +	.buf_queue	= vb2ops_vdec_buf_queue,
> +	.wait_prepare	= vb2_ops_wait_prepare,
> +	.wait_finish	= vb2_ops_wait_finish,
> +	.buf_init	= vb2ops_vdec_buf_init,
> +	.buf_finish	= vb2ops_vdec_buf_finish,
> +	.start_streaming	= vb2ops_vdec_start_streaming,
> +	.stop_streaming	= vb2ops_vdec_stop_streaming,
> +};
> +
> +const struct v4l2_ioctl_ops mtk_vdec_ioctl_ops = {
> +	.vidioc_streamon	= v4l2_m2m_ioctl_streamon,
> +	.vidioc_streamoff	= v4l2_m2m_ioctl_streamoff,
> +	.vidioc_reqbufs		= v4l2_m2m_ioctl_reqbufs,
> +	.vidioc_querybuf	= v4l2_m2m_ioctl_querybuf,
> +	.vidioc_expbuf		= v4l2_m2m_ioctl_expbuf,
> +
> +	.vidioc_qbuf		= vidioc_vdec_qbuf,
> +	.vidioc_dqbuf		= vidioc_vdec_dqbuf,
> +
> +	.vidioc_try_fmt_vid_cap_mplane	= vidioc_try_fmt_vid_cap_mplane,
> +	.vidioc_try_fmt_vid_out_mplane	= vidioc_try_fmt_vid_out_mplane,
> +
> +	.vidioc_s_fmt_vid_cap_mplane	= vidioc_vdec_s_fmt,
> +	.vidioc_s_fmt_vid_out_mplane	= vidioc_vdec_s_fmt,
> +	.vidioc_g_fmt_vid_cap_mplane	= vidioc_vdec_g_fmt,
> +	.vidioc_g_fmt_vid_out_mplane	= vidioc_vdec_g_fmt,
> +
> +	.vidioc_enum_fmt_vid_cap_mplane	= vidioc_vdec_enum_fmt_vid_cap_mplane,
> +	.vidioc_enum_fmt_vid_out_mplane	= vidioc_vdec_enum_fmt_vid_out_mplane,
> +	.vidioc_enum_framesizes	= vidioc_enum_framesizes,
> +
> +	.vidioc_querycap		= vidioc_vdec_querycap,
> +	.vidioc_subscribe_event		= vidioc_vdec_subscribe_evt,
> +	.vidioc_unsubscribe_event	= v4l2_event_unsubscribe,
> +	.vidioc_g_selection             = vidioc_vdec_g_selection,
> +};
> +
> +int mtk_vcodec_dec_queue_init(void *priv, struct vb2_queue *src_vq,
> +			   struct vb2_queue *dst_vq)
> +{
> +	struct mtk_vcodec_ctx *ctx = priv;
> +	int ret = 0;
> +
> +	mtk_v4l2_debug(3, "[%d]", ctx->id);
> +
> +	src_vq->type		= V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
> +	src_vq->io_modes	= VB2_DMABUF | VB2_MMAP;
> +	src_vq->drv_priv	= ctx;
> +	src_vq->buf_struct_size = sizeof(struct mtk_video_dec_buf);
> +	src_vq->ops		= &mtk_vdec_vb2_ops;
> +	src_vq->mem_ops		= &vb2_dma_contig_memops;
> +	src_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
> +	src_vq->lock		= &ctx->dev->dev_mutex;
> +
> +	ret = vb2_queue_init(src_vq);
> +	if (ret) {
> +		mtk_v4l2_err("Failed to initialize videobuf2 queue(output)");
> +		return ret;
> +	}
> +	dst_vq->type		= V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
> +	dst_vq->io_modes	= VB2_DMABUF | VB2_MMAP;
> +	dst_vq->drv_priv	= ctx;
> +	dst_vq->buf_struct_size = sizeof(struct mtk_video_dec_buf);
> +	dst_vq->ops		= &mtk_vdec_vb2_ops;
> +	dst_vq->mem_ops		= &vb2_dma_contig_memops;
> +	dst_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
> +	dst_vq->lock		= &ctx->dev->dev_mutex;
> +
> +	ret = vb2_queue_init(dst_vq);
> +	if (ret) {
> +		vb2_queue_release(src_vq);
> +		mtk_v4l2_err("Failed to initialize videobuf2 queue(capture)");
> +	}
> +
> +	return ret;
> +}
> +
> diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.h b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.h
> new file mode 100644
> index 0000000..595c244
> --- /dev/null
> +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.h
> @@ -0,0 +1,88 @@
> +/*
> +* Copyright (c) 2016 MediaTek Inc.
> +* Author: PC Chen <[e-mail]>
> +*         Tiffany Lin <[e-mail]>
> +*
> +* This program is free software; you can redistribute it and/or modify
> +* it under the terms of the GNU General Public License version 2 as
> +* published by the Free Software Foundation.
> +*
> +* This program is distributed in the hope that it will be useful,
> +* but WITHOUT ANY WARRANTY; without even the implied warranty of
> +* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> +* GNU General Public License for more details.
> +*/
> +
> +#ifndef _MTK_VCODEC_DEC_H_
> +#define _MTK_VCODEC_DEC_H_
> +
> +#include <media/videobuf2-core.h>
> +#include <media/videobuf2-v4l2.h>
> +
> +#define VCODEC_CAPABILITY_4K_DISABLED	0x10
> +#define VCODEC_DEC_4K_CODED_WIDTH	4096U
> +#define VCODEC_DEC_4K_CODED_HEIGHT	2304U
> +#define MTK_VDEC_MAX_W	2048U
> +#define MTK_VDEC_MAX_H	1088U
> +
> +#define MTK_VDEC_IRQ_STATUS_DEC_SUCCESS        0x10000
> +
> +/**
> + * struct vdec_fb  - decoder frame buffer
> + * @base_y	: Y plane memory info
> + * @base_c	: C plane memory info
> + * @status      : frame buffer status (vdec_fb_status)
> + */
> +struct vdec_fb {
> +	struct mtk_vcodec_mem	base_y;
> +	struct mtk_vcodec_mem	base_c;
> +	unsigned int	status;
> +};
> +
> +/**
> + * struct mtk_video_dec_buf - Private data related to each VB2 buffer.
> + * @b:		VB2 buffer
> + * @list:	link list
> + * @used:	Capture buffer contain decoded frame data and keep in
> + *			codec data structure
> + * @ready_to_display:	Capture buffer not display yet
> + * @queued_in_vb2:	Capture buffer is queue in vb2
> + * @queued_in_v4l2:	Capture buffer is in v4l2 driver, but not in vb2
> + *			queue yet
> + * @lastframe:		Intput buffer is last buffer - EOS
> + * @frame_buffer:	Decode status, and buffer information of Capture buffer
> + *
> + * Note : These status information help us track and debug buffer state
> + */
> +struct mtk_video_dec_buf {
> +	struct vb2_v4l2_buffer	vb;
> +	struct list_head	list;
> +
> +	bool	used;
> +	bool	ready_to_display;
> +	bool	queued_in_vb2;
> +	bool	queued_in_v4l2;
> +	bool	lastframe;
> +	struct vdec_fb	frame_buffer;
> +};
> +
> +extern const struct v4l2_ioctl_ops mtk_vdec_ioctl_ops;
> +extern const struct v4l2_m2m_ops mtk_vdec_m2m_ops;
> +
> +
> +/*
> + * mtk_vdec_lock/mtk_vdec_unlock are for ctx instance to
> + * get/release lock before/after access decoder hw.
> + * mtk_vdec_lock get decoder hw lock and set curr_ctx
> + * to ctx instance that get lock
> + */
> +void mtk_vdec_unlock(struct mtk_vcodec_ctx *ctx);
> +void mtk_vdec_lock(struct mtk_vcodec_ctx *ctx);
> +int mtk_vcodec_dec_queue_init(void *priv, struct vb2_queue *src_vq,
> +			   struct vb2_queue *dst_vq);
> +void mtk_vcodec_dec_set_default_params(struct mtk_vcodec_ctx *ctx);
> +void mtk_vcodec_vdec_release(struct mtk_vcodec_ctx *ctx);
> +int mtk_vcodec_dec_ctrls_setup(struct mtk_vcodec_ctx *ctx);
> +
> +
> +#endif /* _MTK_VCODEC_DEC_H_ */
> diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c
> new file mode 100644
> index 0000000..725d1e5
> --- /dev/null
> +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c
> @@ -0,0 +1,408 @@
> +/*
> +* Copyright (c) 2016 MediaTek Inc.
> +* Author: PC Chen <[e-mail]>
> +*         Tiffany Lin <[e-mail]>
> +*
> +* This program is free software; you can redistribute it and/or modify
> +* it under the terms of the GNU General Public License version 2 as
> +* published by the Free Software Foundation.
> +*
> +* This program is distributed in the hope that it will be useful,
> +* but WITHOUT ANY WARRANTY; without even the implied warranty of
> +* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> +* GNU General Public License for more details.
> +*/
> +
> +#include <linux/slab.h>
> +#include <linux/interrupt.h>
> +#include <linux/irq.h>
> +#include <linux/module.h>
> +#include <linux/of_device.h>
> +#include <linux/of.h>
> +#include <media/v4l2-event.h>
> +#include <media/v4l2-mem2mem.h>
> +#include <media/videobuf2-dma-contig.h>
> +
> +#include "mtk_vcodec_drv.h"
> +#include "mtk_vcodec_dec.h"
> +#include "mtk_vcodec_dec_pm.h"
> +#include "mtk_vcodec_intr.h"
> +#include "mtk_vcodec_util.h"
> +#include "mtk_vpu.h"
> +
> +#define VDEC_HW_ACTIVE	0x10
> +#define VDEC_IRQ_CFG	0x11
> +#define VDEC_IRQ_CLR	0x10
> +#define VDEC_IRQ_CFG_REG	0xa4
> +
> +module_param(mtk_v4l2_dbg_level, int, S_IRUGO | S_IWUSR);
> +module_param(mtk_vcodec_dbg, bool, S_IRUGO | S_IWUSR);
> +
> +/* Wake up context wait_queue */
> +static void wake_up_ctx(struct mtk_vcodec_ctx *ctx)
> +{
> +	ctx->int_cond = 1;
> +	wake_up_interruptible(&ctx->queue);
> +}
> +
> +static irqreturn_t mtk_vcodec_dec_irq_handler(int irq, void *priv)
> +{
> +	struct mtk_vcodec_dev *dev = priv;
> +	struct mtk_vcodec_ctx *ctx;
> +	u32 cg_status = 0;
> +	unsigned int dec_done_status = 0;
> +	void __iomem *vdec_misc_addr = dev->reg_base[VDEC_MISC] +
> +					VDEC_IRQ_CFG_REG;
> +
> +	ctx = mtk_vcodec_get_curr_ctx(dev);
> +
> +	/* check if HW active or not */
> +	cg_status = readl(dev->reg_base[0]);
> +	if ((cg_status & VDEC_HW_ACTIVE) != 0) {
> +		mtk_v4l2_err("DEC ISR, VDEC active is not 0x0 (0x%08x)",
> +			     cg_status);
> +		return IRQ_HANDLED;
> +	}
> +
> +	dec_done_status = readl(vdec_misc_addr);
> +	ctx->irq_status = dec_done_status;
> +	if ((dec_done_status & MTK_VDEC_IRQ_STATUS_DEC_SUCCESS) !=
> +		MTK_VDEC_IRQ_STATUS_DEC_SUCCESS)
> +		return IRQ_HANDLED;
> +
> +	/* clear interrupt */
> +	writel((readl(vdec_misc_addr) | VDEC_IRQ_CFG),
> +		dev->reg_base[VDEC_MISC] + VDEC_IRQ_CFG_REG);
> +	writel((readl(vdec_misc_addr) & ~VDEC_IRQ_CLR),
> +		dev->reg_base[VDEC_MISC] + VDEC_IRQ_CFG_REG);
> +
> +	wake_up_ctx(ctx);
> +
> +	mtk_v4l2_debug(3,
> +			"mtk_vcodec_dec_irq_handler :wake up ctx %d, dec_done_status=%x",
> +			ctx->id, dec_done_status);
> +
> +	return IRQ_HANDLED;
> +}
> +
> +static void mtk_vcodec_dec_reset_handler(void *priv)
> +{
> +	struct mtk_vcodec_dev *dev = priv;
> +	struct mtk_vcodec_ctx *ctx;
> +
> +	mtk_v4l2_err("Watchdog timeout!!");
> +
> +	mutex_lock(&dev->dev_mutex);
> +	list_for_each_entry(ctx, &dev->ctx_list, list) {
> +		ctx->state = MTK_STATE_ABORT;
> +		mtk_v4l2_debug(0, "[%d] Change to state MTK_STATE_ERROR",
> +				ctx->id);
> +	}
> +	mutex_unlock(&dev->dev_mutex);
> +}
> +
> +static int fops_vcodec_open(struct file *file)
> +{
> +	struct mtk_vcodec_dev *dev = video_drvdata(file);
> +	struct mtk_vcodec_ctx *ctx = NULL;
> +	int ret = 0;
> +
> +	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
> +	if (!ctx)
> +		return -ENOMEM;
> +
> +	mutex_lock(&dev->dev_mutex);
> +	ctx->id = dev->id_counter++;
> +	v4l2_fh_init(&ctx->fh, video_devdata(file));
> +	file->private_data = &ctx->fh;
> +	v4l2_fh_add(&ctx->fh);
> +	INIT_LIST_HEAD(&ctx->list);
> +	ctx->dev = dev;
> +	init_waitqueue_head(&ctx->queue);
> +	mutex_init(&ctx->lock);
> +
> +	ctx->type = MTK_INST_DECODER;
> +	ret = mtk_vcodec_dec_ctrls_setup(ctx);
> +	if (ret) {
> +		mtk_v4l2_err("Failed to setup mt vcodec controls");
> +		goto err_ctrls_setup;
> +	}
> +	ctx->m2m_ctx = v4l2_m2m_ctx_init(dev->m2m_dev_dec, ctx,
> +		&mtk_vcodec_dec_queue_init);
> +	if (IS_ERR((__force void *)ctx->m2m_ctx)) {
> +		ret = PTR_ERR((__force void *)ctx->m2m_ctx);
> +		mtk_v4l2_err("Failed to v4l2_m2m_ctx_init() (%d)",
> +			ret);
> +		goto err_m2m_ctx_init;
> +	}
> +	mtk_vcodec_dec_set_default_params(ctx);
> +
> +	if (v4l2_fh_is_singular(&ctx->fh)) {
> +		mtk_vcodec_dec_pw_on(&dev->pm);
> +		/*
> +		 * vpu_load_firmware checks if it was loaded already and
> +		 * does nothing in that case
> +		 */
> +		ret = vpu_load_firmware(dev->vpu_plat_dev);
> +		if (ret < 0) {
> +			/*
> +			 * Return 0 if downloading firmware successfully,
> +			 * otherwise it is failed
> +			 */
> +			mtk_v4l2_err("vpu_load_firmware failed!");
> +			goto err_load_fw;
> +		}
> +
> +		dev->dec_capability =
> +			vpu_get_vdec_hw_capa(dev->vpu_plat_dev);
> +		mtk_v4l2_debug(0, "decoder capability %x", dev->dec_capability);
> +	}
> +
> +	dev->num_instances++;

This field can be dropped since it is no longer used.

> +	list_add(&ctx->list, &dev->ctx_list);
> +
> +	mutex_unlock(&dev->dev_mutex);
> +	mtk_v4l2_debug(0, "%s decoder [%d]", dev_name(&dev->plat_dev->dev),
> +			ctx->id);
> +	return ret;
> +
> +	/* Deinit when failure occurred */
> +err_load_fw:
> +	v4l2_m2m_ctx_release(ctx->m2m_ctx);
> +err_m2m_ctx_init:
> +	v4l2_ctrl_handler_free(&ctx->ctrl_hdl);
> +err_ctrls_setup:
> +	v4l2_fh_del(&ctx->fh);
> +	v4l2_fh_exit(&ctx->fh);
> +	kfree(ctx);
> +	mutex_unlock(&dev->dev_mutex);
> +
> +	return ret;
> +}
> +
> +static int fops_vcodec_release(struct file *file)
> +{
> +	struct mtk_vcodec_dev *dev = video_drvdata(file);
> +	struct mtk_vcodec_ctx *ctx = fh_to_ctx(file->private_data);
> +
> +	mtk_v4l2_debug(0, "[%d] decoder", ctx->id);
> +	mutex_lock(&dev->dev_mutex);
> +
> +	mtk_vcodec_vdec_release(ctx);
> +	if (v4l2_fh_is_singular(&ctx->fh))
> +		mtk_vcodec_dec_pw_off(&dev->pm);
> +
> +	v4l2_fh_del(&ctx->fh);
> +	v4l2_fh_exit(&ctx->fh);
> +	v4l2_ctrl_handler_free(&ctx->ctrl_hdl);
> +	v4l2_m2m_ctx_release(ctx->m2m_ctx);
> +
> +	list_del_init(&ctx->list);
> +	dev->num_instances--;
> +	kfree(ctx);
> +	mutex_unlock(&dev->dev_mutex);
> +	return 0;
> +}
> +
> +static const struct v4l2_file_operations mtk_vcodec_fops = {
> +	.owner		= THIS_MODULE,
> +	.open		= fops_vcodec_open,
> +	.release	= fops_vcodec_release,
> +	.poll		= v4l2_m2m_fop_poll,
> +	.unlocked_ioctl	= video_ioctl2,
> +	.mmap		= v4l2_m2m_fop_mmap,
> +};
> +
> +static int mtk_vcodec_probe(struct platform_device *pdev)
> +{
> +	struct mtk_vcodec_dev *dev;
> +	struct video_device *vfd_dec;
> +	struct resource *res;
> +	int i, ret;
> +	DEFINE_DMA_ATTRS(attrs);
> +
> +	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
> +	if (!dev)
> +		return -ENOMEM;
> +
> +	INIT_LIST_HEAD(&dev->ctx_list);
> +	dev->plat_dev = pdev;
> +
> +	dev->vpu_plat_dev = vpu_get_plat_device(dev->plat_dev);
> +	if (dev->vpu_plat_dev == NULL) {
> +		mtk_v4l2_err("[VPU] vpu device in not ready");
> +		return -EPROBE_DEFER;
> +	}
> +
> +	vpu_wdt_reg_handler(dev->vpu_plat_dev, mtk_vcodec_dec_reset_handler,
> +			dev, VPU_RST_DEC);
> +
> +	ret = mtk_vcodec_init_dec_pm(dev);
> +	if (ret < 0) {
> +		dev_err(&pdev->dev, "Failed to get mt vcodec clock source");
> +		return ret;
> +	}
> +
> +	for (i = 0; i < NUM_MAX_VDEC_REG_BASE; i++) {
> +		res = platform_get_resource(pdev, IORESOURCE_MEM, i);
> +		if (res == NULL) {
> +			dev_err(&pdev->dev, "get memory resource failed.");
> +			ret = -ENXIO;
> +			goto err_res;
> +		}
> +		dev->reg_base[i] = devm_ioremap_resource(&pdev->dev, res);
> +		if (IS_ERR((__force void *)dev->reg_base[i])) {
> +			dev_err(&pdev->dev,
> +				"devm_ioremap_resource %d failed.", i);
> +			ret = PTR_ERR((__force void *)dev->reg_base);
> +			goto err_res;
> +		}
> +		mtk_v4l2_debug(2, "reg[%d] base=%p", i, dev->reg_base[i]);
> +	}
> +
> +	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
> +	if (res == NULL) {
> +		dev_err(&pdev->dev, "failed to get irq resource");
> +		ret = -ENOENT;
> +		goto err_res;
> +	}
> +
> +	dev->dec_irq = platform_get_irq(pdev, 0);
> +	ret = devm_request_irq(&pdev->dev, dev->dec_irq,
> +			mtk_vcodec_dec_irq_handler, 0, pdev->name, dev);
> +	if (ret) {
> +		dev_err(&pdev->dev, "Failed to install dev->dec_irq %d (%d)",
> +			dev->dec_irq,
> +			ret);
> +		goto err_res;
> +	}
> +
> +	disable_irq(dev->dec_irq);
> +	mutex_init(&dev->dec_mutex);
> +	mutex_init(&dev->dev_mutex);
> +	spin_lock_init(&dev->irqlock);
> +
> +	snprintf(dev->v4l2_dev.name, sizeof(dev->v4l2_dev.name), "%s",
> +		"[/MTK_V4L2_VDEC]");
> +
> +	ret = v4l2_device_register(&pdev->dev, &dev->v4l2_dev);
> +	if (ret) {
> +		mtk_v4l2_err("v4l2_device_register err=%d", ret);
> +		goto err_res;
> +	}
> +
> +	init_waitqueue_head(&dev->queue);
> +
> +	vfd_dec = video_device_alloc();
> +	if (!vfd_dec) {
> +		mtk_v4l2_err("Failed to allocate video device");
> +		ret = -ENOMEM;
> +		goto err_dec_alloc;
> +	}
> +	vfd_dec->fops		= &mtk_vcodec_fops;
> +	vfd_dec->ioctl_ops	= &mtk_vdec_ioctl_ops;
> +	vfd_dec->release	= video_device_release;
> +	vfd_dec->lock		= &dev->dev_mutex;
> +	vfd_dec->v4l2_dev	= &dev->v4l2_dev;
> +	vfd_dec->vfl_dir	= VFL_DIR_M2M;
> +	vfd_dec->device_caps	= V4L2_CAP_VIDEO_M2M_MPLANE |
> +			V4L2_CAP_STREAMING;
> +
> +	snprintf(vfd_dec->name, sizeof(vfd_dec->name), "%s",
> +		MTK_VCODEC_DEC_NAME);
> +	video_set_drvdata(vfd_dec, dev);
> +	dev->vfd_dec = vfd_dec;
> +	platform_set_drvdata(pdev, dev);
> +
> +	dev->alloc_ctx = vb2_dma_contig_init_ctx(&pdev->dev);
> +	if (IS_ERR((__force void *)dev->alloc_ctx)) {
> +		mtk_v4l2_err("Failed to alloc vb2 dma context 0");
> +		ret = PTR_ERR((__force void *)dev->alloc_ctx);
> +		goto err_vb2_ctx_init;
> +	}
> +
> +	dev->m2m_dev_dec = v4l2_m2m_init(&mtk_vdec_m2m_ops);
> +	if (IS_ERR((__force void *)dev->m2m_dev_dec)) {
> +		mtk_v4l2_err("Failed to init mem2mem dec device");
> +		ret = PTR_ERR((__force void *)dev->m2m_dev_dec);
> +		goto err_dec_mem_init;
> +	}
> +
> +	dev->decode_workqueue =
> +		alloc_ordered_workqueue(MTK_VCODEC_DEC_NAME,
> +			WQ_MEM_RECLAIM | WQ_FREEZABLE);
> +	if (!dev->decode_workqueue) {
> +		mtk_v4l2_err("Failed to create decode workqueue");
> +		ret = -EINVAL;
> +		goto err_event_workq;
> +	}
> +
> +	ret = video_register_device(vfd_dec, VFL_TYPE_GRABBER, 0);
> +	if (ret) {
> +		mtk_v4l2_err("Failed to register video device");
> +		goto err_dec_reg;
> +	}
> +
> +	/* Avoid the iommu eat big hunks */
> +	dma_set_attr(DMA_ATTR_ALLOC_SINGLE_PAGES, &attrs);
> +
> +	mtk_v4l2_debug(0, "decoder registered as /dev/video%d",
> +		vfd_dec->num);
> +
> +	return 0;
> +
> +err_dec_reg:
> +	destroy_workqueue(dev->decode_workqueue);
> +err_event_workq:
> +	v4l2_m2m_release(dev->m2m_dev_dec);
> +err_dec_mem_init:
> +	vb2_dma_contig_cleanup_ctx(dev->alloc_ctx);
> +err_vb2_ctx_init:
> +	video_unregister_device(vfd_dec);
> +err_dec_alloc:
> +	v4l2_device_unregister(&dev->v4l2_dev);
> +err_res:
> +	mtk_vcodec_release_dec_pm(dev);
> +	return ret;
> +}
> +
> +static const struct of_device_id mtk_vcodec_match[] = {
> +	{.compatible = "mediatek,mt8173-vcodec-dec",},
> +	{},
> +};
> +
> +MODULE_DEVICE_TABLE(of, mtk_vcodec_match);
> +
> +static int mtk_vcodec_dec_remove(struct platform_device *pdev)
> +{
> +	struct mtk_vcodec_dev *dev = platform_get_drvdata(pdev);
> +
> +	flush_workqueue(dev->decode_workqueue);
> +	destroy_workqueue(dev->decode_workqueue);
> +	if (dev->m2m_dev_dec)
> +		v4l2_m2m_release(dev->m2m_dev_dec);
> +	if (dev->alloc_ctx)
> +		vb2_dma_contig_cleanup_ctx(dev->alloc_ctx);
> +
> +	if (dev->vfd_dec)
> +		video_unregister_device(dev->vfd_dec);
> +
> +	v4l2_device_unregister(&dev->v4l2_dev);
> +	mtk_vcodec_release_dec_pm(dev);
> +	return 0;
> +}
> +
> +static struct platform_driver mtk_vcodec_dec_driver = {
> +	.probe	= mtk_vcodec_probe,
> +	.remove	= mtk_vcodec_dec_remove,
> +	.driver	= {
> +		.name	= MTK_VCODEC_DEC_NAME,
> +		.owner	= THIS_MODULE,
> +		.of_match_table = mtk_vcodec_match,
> +	},
> +};
> +
> +module_platform_driver(mtk_vcodec_dec_driver);
> +
> +MODULE_LICENSE("GPL v2");
> +MODULE_DESCRIPTION("Mediatek video codec V4L2 decoder driver");
> diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_pm.c b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_pm.c
> new file mode 100644
> index 0000000..364b756
> --- /dev/null
> +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_pm.c
> @@ -0,0 +1,206 @@
> +/*
> +* Copyright (c) 2016 MediaTek Inc.
> +* Author: Tiffany Lin <[e-mail]>
> +*
> +* This program is free software; you can redistribute it and/or modify
> +* it under the terms of the GNU General Public License version 2 as
> +* published by the Free Software Foundation.
> +*
> +* This program is distributed in the hope that it will be useful,
> +* but WITHOUT ANY WARRANTY; without even the implied warranty of
> +* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> +* GNU General Public License for more details.
> +*/
> +
> +#include <linux/clk.h>
> +#include <linux/of_address.h>
> +#include <linux/of_platform.h>
> +#include <linux/pm_runtime.h>
> +#include <soc/mediatek/smi.h>
> +
> +#include "mtk_vcodec_dec_pm.h"
> +#include "mtk_vcodec_util.h"
> +#include "mtk_vpu.h"
> +
> +int mtk_vcodec_init_dec_pm(struct mtk_vcodec_dev *mtkdev)
> +{
> +	struct device_node *node;
> +	struct platform_device *pdev;
> +	struct device *dev;
> +	struct mtk_vcodec_pm *pm;
> +	int ret = 0;
> +
> +	pdev = mtkdev->plat_dev;
> +	pm = &mtkdev->pm;
> +	pm->mtkdev = mtkdev;
> +	dev = &pdev->dev;
> +	node = of_parse_phandle(pdev->dev.of_node, "mediatek,larb", 0);
> +	if (!node) {
> +		mtk_v4l2_err("of_parse_phandle mediatek,larb fail!");
> +		return -1;
> +	}
> +
> +	pdev = of_find_device_by_node(node);
> +	if (WARN_ON(!pdev)) {
> +		of_node_put(node);
> +		return -1;
> +	}
> +	pm->larbvdec = &pdev->dev;
> +
> +	pdev = mtkdev->plat_dev;
> +	pm->dev = &pdev->dev;
> +
> +	pm->vcodecpll = devm_clk_get(&pdev->dev, "vcodecpll");
> +	if (pm->vcodecpll == NULL) {
> +		mtk_v4l2_err("devm_clk_get vcodecpll fail");
> +		ret = -1;
> +	}
> +
> +	pm->univpll_d2 = devm_clk_get(&pdev->dev, "univpll_d2");
> +	if (pm->univpll_d2 == NULL) {
> +		mtk_v4l2_err("devm_clk_get univpll_d2 fail");
> +		ret = -1;
> +	}
> +
> +	pm->clk_cci400_sel = devm_clk_get(&pdev->dev, "clk_cci400_sel");
> +	if (pm->clk_cci400_sel == NULL) {
> +		mtk_v4l2_err("devm_clk_get clk_cci400_sel fail");
> +		ret = -1;
> +	}
> +
> +	pm->vdec_sel = devm_clk_get(&pdev->dev, "vdec_sel");
> +	if (pm->vdec_sel == NULL) {
> +		mtk_v4l2_err("devm_clk_get vdec_sel fail");
> +		ret = -1;
> +	}
> +
> +	pm->vdecpll = devm_clk_get(&pdev->dev, "vdecpll");
> +	if (pm->vdecpll == NULL) {
> +		mtk_v4l2_err("devm_clk_get vdecpll fail");
> +		ret = -1;
> +	}
> +
> +	pm->vencpll = devm_clk_get(&pdev->dev, "vencpll");
> +	if (pm->vencpll == NULL) {
> +		mtk_v4l2_err("devm_clk_get vencpll fail");
> +		ret = -1;
> +	}
> +
> +	pm->venc_lt_sel = devm_clk_get(&pdev->dev, "venc_lt_sel");
> +	if (pm->venc_lt_sel == NULL) {
> +		mtk_v4l2_err("devm_clk_get venc_lt_sel fail");
> +		ret = -1;
> +	}
> +
> +	pm->vdec_bus_clk_src = devm_clk_get(&pdev->dev, "vdec_bus_clk_src");
> +	if (pm->vdec_bus_clk_src == NULL) {
> +		mtk_v4l2_err("devm_clk_get vdec_bus_clk_src");
> +		ret = -1;
> +	}
> +
> +	pm_runtime_enable(&pdev->dev);
> +
> +	return ret;
> +}
> +
> +void mtk_vcodec_release_dec_pm(struct mtk_vcodec_dev *dev)
> +{
> +	pm_runtime_disable(dev->pm.dev);
> +}
> +
> +void mtk_vcodec_dec_pw_on(struct mtk_vcodec_pm *pm)
> +{
> +	int ret;
> +
> +	ret = pm_runtime_get_sync(pm->dev);
> +	if (ret)
> +		mtk_v4l2_err("pm_runtime_get_sync fail %d", ret);
> +}
> +
> +void mtk_vcodec_dec_pw_off(struct mtk_vcodec_pm *pm)
> +{
> +	int ret;
> +
> +	ret = pm_runtime_put_sync(pm->dev);
> +	if (ret)
> +		mtk_v4l2_err("pm_runtime_put_sync fail %d", ret);
> +}
> +
> +void mtk_vcodec_dec_clock_on(struct mtk_vcodec_pm *pm)
> +{
> +	int ret;
> +
> +	ret = clk_set_rate(pm->vcodecpll, 1482 * 1000000);
> +	if (ret)
> +		mtk_v4l2_err("clk_set_rate vcodecpll fail %d", ret);
> +
> +	ret = clk_set_rate(pm->vencpll, 800 * 1000000);
> +	if (ret)
> +		mtk_v4l2_err("clk_set_rate vencpll fail %d", ret);
> +
> +	ret = clk_prepare_enable(pm->vcodecpll);
> +	if (ret)
> +		mtk_v4l2_err("clk_prepare_enable vcodecpll fail %d", ret);
> +
> +	ret = clk_prepare_enable(pm->vencpll);
> +	if (ret)
> +		mtk_v4l2_err("clk_prepare_enable vencpll fail %d", ret);
> +
> +	ret = clk_prepare_enable(pm->vdec_bus_clk_src);
> +	if (ret)
> +		mtk_v4l2_err("clk_prepare_enable vdec_bus_clk_src fail %d",
> +				ret);
> +
> +	ret = clk_prepare_enable(pm->venc_lt_sel);
> +	if (ret)
> +		mtk_v4l2_err("clk_prepare_enable venc_lt_sel fail %d", ret);
> +
> +	ret = clk_set_parent(pm->venc_lt_sel, pm->vdec_bus_clk_src);
> +	if (ret)
> +		mtk_v4l2_err("clk_set_parent venc_lt_sel vdec_bus_clk_src fail %d",
> +				ret);
> +
> +	ret = clk_prepare_enable(pm->univpll_d2);
> +	if (ret)
> +		mtk_v4l2_err("clk_prepare_enable univpll_d2 fail %d", ret);
> +
> +	ret = clk_prepare_enable(pm->clk_cci400_sel);
> +	if (ret)
> +		mtk_v4l2_err("clk_prepare_enable clk_cci400_sel fail %d", ret);
> +
> +	ret = clk_set_parent(pm->clk_cci400_sel, pm->univpll_d2);
> +	if (ret)
> +		mtk_v4l2_err("clk_set_parent clk_cci400_sel univpll_d2 fail %d",
> +				ret);
> +
> +	ret = clk_prepare_enable(pm->vdecpll);
> +	if (ret)
> +		mtk_v4l2_err("clk_prepare_enable vdecpll fail %d", ret);
> +
> +	ret = clk_prepare_enable(pm->vdec_sel);
> +	if (ret)
> +		mtk_v4l2_err("clk_prepare_enable vdec_sel fail %d", ret);
> +
> +	ret = clk_set_parent(pm->vdec_sel, pm->vdecpll);
> +	if (ret)
> +		mtk_v4l2_err("clk_set_parent vdec_sel vdecpll fail %d", ret);
> +
> +	ret = mtk_smi_larb_get(pm->larbvdec);
> +	if (ret)
> +		mtk_v4l2_err("mtk_smi_larb_get larbvdec fail %d", ret);
> +
> +}
> +
> +void mtk_vcodec_dec_clock_off(struct mtk_vcodec_pm *pm)
> +{
> +	mtk_smi_larb_put(pm->larbvdec);
> +	clk_disable_unprepare(pm->vdec_sel);
> +	clk_disable_unprepare(pm->vdecpll);
> +	clk_disable_unprepare(pm->univpll_d2);
> +	clk_disable_unprepare(pm->clk_cci400_sel);
> +	clk_disable_unprepare(pm->venc_lt_sel);
> +	clk_disable_unprepare(pm->vdec_bus_clk_src);
> +	clk_disable_unprepare(pm->vencpll);
> +	clk_disable_unprepare(pm->vcodecpll);
> +}
> +
> diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_pm.h b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_pm.h
> new file mode 100644
> index 0000000..b8bf56f
> --- /dev/null
> +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_pm.h
> @@ -0,0 +1,28 @@
> +/*
> +* Copyright (c) 2016 MediaTek Inc.
> +* Author: Tiffany Lin <[e-mail]>
> +*
> +* This program is free software; you can redistribute it and/or modify
> +* it under the terms of the GNU General Public License version 2 as
> +* published by the Free Software Foundation.
> +*
> +* This program is distributed in the hope that it will be useful,
> +* but WITHOUT ANY WARRANTY; without even the implied warranty of
> +* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> +* GNU General Public License for more details.
> +*/
> +
> +#ifndef _MTK_VCODEC_DEC_PM_H_
> +#define _MTK_VCODEC_DEC_PM_H_
> +
> +#include "mtk_vcodec_drv.h"
> +
> +int mtk_vcodec_init_dec_pm(struct mtk_vcodec_dev *dev);
> +void mtk_vcodec_release_dec_pm(struct mtk_vcodec_dev *dev);
> +
> +void mtk_vcodec_dec_pw_on(struct mtk_vcodec_pm *pm);
> +void mtk_vcodec_dec_pw_off(struct mtk_vcodec_pm *pm);
> +void mtk_vcodec_dec_clock_on(struct mtk_vcodec_pm *pm);
> +void mtk_vcodec_dec_clock_off(struct mtk_vcodec_pm *pm);
> +
> +#endif /* _MTK_VCODEC_DEC_PM_H_ */
> diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_drv.h b/drivers/media/platform/mtk-vcodec/mtk_vcodec_drv.h
> index 78eee50..a11dfec 100644
> --- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_drv.h
> +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_drv.h
> @@ -26,10 +26,10 @@
>  #include "mtk_vcodec_util.h"
>  
>  #define MTK_VCODEC_DRV_NAME	"mtk_vcodec_drv"
> +#define MTK_VCODEC_DEC_NAME	"mtk-vcodec-dec"
>  #define MTK_VCODEC_ENC_NAME	"mtk-vcodec-enc"
>  #define MTK_PLATFORM_STR	"platform:mt8173"
>  
> -
>  #define MTK_VCODEC_MAX_PLANES	3
>  #define MTK_V4L2_BENCHMARK	0
>  #define WAIT_INTR_TIMEOUT_MS	1000
> @@ -180,6 +180,9 @@ struct mtk_enc_params {
>   * struct mtk_vcodec_pm - Power management data structure
>   */
>  struct mtk_vcodec_pm {
> +	struct clk	*vdec_bus_clk_src;
> +	struct clk	*vencpll;
> +
>  	struct clk	*vcodecpll;
>  	struct clk	*univpll_d2;
>  	struct clk	*clk_cci400_sel;
> @@ -197,6 +200,32 @@ struct mtk_vcodec_pm {
>  };
>  
>  /**
> + * struct vdec_pic_info  - picture size information
> + * @pic_w: picture width
> + * @pic_h: picture height
> + * @buf_w: picture buffer width (64 aligned up from pic_w)
> + * @buf_h: picture buffer heiht (64 aligned up from pic_h)
> + * @y_bs_sz: Y bitstream size
> + * @c_bs_sz: CbCr bitstream size
> + * @y_len_sz: additional size required to store decompress information for y
> + *		plane
> + * @c_len_sz: additional size required to store decompress information for cbcr
> + *		plane
> + * E.g. suppose picture size is 176x144,
> + *      buffer size will be aligned to 176x160.
> + */
> +struct vdec_pic_info {
> +	unsigned int pic_w;
> +	unsigned int pic_h;
> +	unsigned int buf_w;
> +	unsigned int buf_h;
> +	unsigned int y_bs_sz;
> +	unsigned int c_bs_sz;
> +	unsigned int y_len_sz;
> +	unsigned int c_len_sz;
> +};
> +
> +/**
>   * struct mtk_vcodec_ctx - Context (instance) private data.
>   *
>   * @type: type of the instance - decoder or encoder
> @@ -210,9 +239,12 @@ struct mtk_vcodec_pm {
>   * @state: state of the context
>   * @param_change: indicate encode parameter type
>   * @enc_params: encoding parameters
> - * @enc_if: hoooked encoder driver interface
> + * @dec_if: hooked decoder driver interface
> + * @enc_if: hooked encoder driver interface
>   * @drv_handle: driver handle for specific decode/encode instance
>   *
> + * @picinfo: store picture info after header parsing
> + * @dpb_size: store dpb count after header parsing
>   * @int_cond: variable used by the waitqueue
>   * @int_type: type of the last interrupt
>   * @queue: waitqueue that can be used to wait for this context to
> @@ -220,12 +252,16 @@ struct mtk_vcodec_pm {
>   * @irq_status: irq status
>   *
>   * @ctrl_hdl: handler for v4l2 framework
> + * @decode_work: worker for the decoding
>   * @encode_work: worker for the encoding
> + * @last_decoded_picinfo: pic information get from latest decode
>   *
>   * @colorspace: enum v4l2_colorspace; supplemental to pixelformat
>   * @ycbcr_enc: enum v4l2_ycbcr_encoding, Y'CbCr encoding
>   * @quantization: enum v4l2_quantization, colorspace quantization
>   * @xfer_func: enum v4l2_xfer_func, colorspace transfer function
> + * @lock: protect variables accessed by V4L2 threads and worker thread such as
> + *	  mtk_video_dec_buf.
>   */
>  struct mtk_vcodec_ctx {
>  	enum mtk_instance_type type;
> @@ -240,21 +276,31 @@ struct mtk_vcodec_ctx {
>  	enum mtk_encode_param param_change;
>  	struct mtk_enc_params enc_params;
>  
> +	struct vdec_common_if *dec_if;
>  	struct venc_common_if *enc_if;
>  	unsigned long drv_handle;
>  
> +	struct vdec_pic_info picinfo;
> +	int dpb_size;
> +
>  	int int_cond;
>  	int int_type;
>  	wait_queue_head_t queue;
>  	unsigned int irq_status;
>  
>  	struct v4l2_ctrl_handler ctrl_hdl;
> +	struct work_struct decode_work;
>  	struct work_struct encode_work;
> +	struct vdec_pic_info last_decoded_picinfo;
>  
>  	enum v4l2_colorspace colorspace;
>  	enum v4l2_ycbcr_encoding ycbcr_enc;
>  	enum v4l2_quantization quantization;
>  	enum v4l2_xfer_func xfer_func;
> +
> +	int decoded_frame_cnt;
> +	struct mutex lock;
> +
>  };
>  
>  /**
> @@ -268,25 +314,48 @@ struct mtk_vcodec_ctx {
>   * @alloc_ctx: VB2 allocator context
>   *	       (for allocations without kernel mapping).
>   * @ctx_list: list of struct mtk_vcodec_ctx
> - * @irqlock: protect data access by irq handler and work thread
> - * @curr_ctx: The context that is waiting for codec hardware
> + * @irqlock: protect data access by irq handler and work thread -- curr_ctx
> + * @curr_ctx: The context that is waiting for codec hardware. Protected by
> + *		irqlock and dec_mutex or enc_mutex.
>   *
>   * @reg_base: Mapped address of MTK Vcodec registers.
>   *
> - * @id_counter: used to identify current opened instance
> + * @id_counter:  An integer id given to the next opened instance
>   * @num_instances: counter of active MTK Vcodec instances
>   *
>   * @encode_workqueue: encode work queue
>   *
> + * @v4l2_dev: V4L2 device to register video devices for.
> + * @vfd_dec: Video device for decoder
> + * @vfd_enc: Video device for encoder
> + *
> + * @m2m_dev_dec: m2m device for decoder
> + * @m2m_dev_enc: m2m device for encoder
> + * @plat_dev: platform device
> + * @vpu_plat_dev: mtk vpu platform device
> + * @alloc_ctx:VB2 allocator context
> + *	      (for allocations without kernel mapping).
> + * @ctx_list: list of struct mtk_vcodec_ctx
> + * @irqlock: protect data access by irq handler and work thread
> + * @curr_ctx: The context that is waiting for codec hardware
> + * @reg_base: Mapped address of MTK Vcodec registers.
> + *
> + * @instance_mask: used to mark which index id are used
> + * @num_instances: counter of active MTK Vcodec instances
> + *
> + * @decode_workqueue: decode work queue
> + * @encode_workqueue: encode work queue
>   * @int_cond: used to identify interrupt condition happen
>   * @int_type: used to identify what kind of interrupt condition happen
>   * @dev_mutex: video_device lock
>   * @queue: waitqueue for waiting for completion of device commands
>   *
> + * @dec_irq: decoder irq resource
>   * @enc_irq: h264 encoder irq resource
> - * @enc_lt_irq: vp8 encoder irq resource
> + * @enc_lt_irq: vp8 encoder lt irq resource
>   *
> - * @enc_mutex: encoder hardware lock.
> + * @dec_mutex: decoder hardware lock
> + * @enc_mutex: encoder hardware lock
>   *
>   * @pm: power management control
>   * @dec_capability: used to identify decode capability, ex: 4k
> @@ -294,8 +363,10 @@ struct mtk_vcodec_ctx {
>   */
>  struct mtk_vcodec_dev {
>  	struct v4l2_device v4l2_dev;
> +	struct video_device *vfd_dec;
>  	struct video_device *vfd_enc;
>  
> +	struct v4l2_m2m_dev *m2m_dev_dec;
>  	struct v4l2_m2m_dev *m2m_dev_enc;
>  	struct platform_device *plat_dev;
>  	struct platform_device *vpu_plat_dev;
> @@ -308,6 +379,7 @@ struct mtk_vcodec_dev {
>  	unsigned long id_counter;
>  	int num_instances;
>  
> +	struct workqueue_struct *decode_workqueue;
>  	struct workqueue_struct *encode_workqueue;
>  
>  	int int_cond;
> @@ -315,9 +387,11 @@ struct mtk_vcodec_dev {
>  	struct mutex dev_mutex;
>  	wait_queue_head_t queue;
>  
> +	int dec_irq;
>  	int enc_irq;
>  	int enc_lt_irq;
>  
> +	struct mutex dec_mutex;
>  	struct mutex enc_mutex;
>  
>  	struct mtk_vcodec_pm pm;
> diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_intr.c b/drivers/media/platform/mtk-vcodec/mtk_vcodec_intr.c
> index 52e7e5c..f0bdb19 100644
> --- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_intr.c
> +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_intr.c
> @@ -30,8 +30,7 @@ int mtk_vcodec_wait_for_done_ctx(struct mtk_vcodec_ctx  *ctx, int command,
>  	timeout_jiff = msecs_to_jiffies(timeout_ms);
>  
>  	ret = wait_event_interruptible_timeout(*waitqueue,
> -				(ctx->int_cond &&
> -				(ctx->int_type == command)),
> +				ctx->int_cond,
>  				timeout_jiff);
>  
>  	if (!ret) {
> @@ -52,3 +51,4 @@ int mtk_vcodec_wait_for_done_ctx(struct mtk_vcodec_ctx  *ctx, int command,
>  	return status;
>  }
>  EXPORT_SYMBOL(mtk_vcodec_wait_for_done_ctx);
> +
> diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_intr.h b/drivers/media/platform/mtk-vcodec/mtk_vcodec_intr.h
> index 33e890f..fbb8b1e 100644
> --- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_intr.h
> +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_intr.h
> @@ -16,7 +16,7 @@
>  #define _MTK_VCODEC_INTR_H_
>  
>  #define MTK_INST_IRQ_RECEIVED		0x1
> -#define MTK_INST_WORK_THREAD_ABORT_DONE	0x2
> +
>  
>  struct mtk_vcodec_ctx;
>  
> diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_util.c b/drivers/media/platform/mtk-vcodec/mtk_vcodec_util.c
> index 5e36513..7617305 100644
> --- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_util.c
> +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_util.c
> @@ -81,14 +81,35 @@ void mtk_vcodec_mem_free(struct mtk_vcodec_ctx *data,
>  		return;
>  	}
>  
> -	dma_free_coherent(dev, size, mem->va, mem->dma_addr);
> -	mem->va = NULL;
> -	mem->dma_addr = 0;
> -	mem->size = 0;
> -
>  	mtk_v4l2_debug(3, "[%d]  - va      = %p", ctx->id, mem->va);
>  	mtk_v4l2_debug(3, "[%d]  - dma     = 0x%lx", ctx->id,
>  		       (unsigned long)mem->dma_addr);
>  	mtk_v4l2_debug(3, "[%d]    size = 0x%lx", ctx->id, size);
> +
> +	dma_free_coherent(dev, size, mem->va, mem->dma_addr);
> +	mem->va = NULL;
> +	mem->dma_addr = 0;
> +	mem->size = 0;
>  }
>  EXPORT_SYMBOL(mtk_vcodec_mem_free);
> +
> +void mtk_vcodec_set_curr_ctx(struct mtk_vcodec_dev *dev,
> +	struct mtk_vcodec_ctx *ctx)
> +{
> +	unsigned long flags;
> +
> +	spin_lock_irqsave(&dev->irqlock, flags);
> +	dev->curr_ctx = ctx;
> +	spin_unlock_irqrestore(&dev->irqlock, flags);
> +}
> +
> +struct mtk_vcodec_ctx *mtk_vcodec_get_curr_ctx(struct mtk_vcodec_dev *dev)
> +{
> +	unsigned long flags;
> +	struct mtk_vcodec_ctx *ctx;
> +
> +	spin_lock_irqsave(&dev->irqlock, flags);
> +	ctx = dev->curr_ctx;
> +	spin_unlock_irqrestore(&dev->irqlock, flags);
> +	return ctx;
> +}
> diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_util.h b/drivers/media/platform/mtk-vcodec/mtk_vcodec_util.h
> index d6345fc..91a0b1a 100644
> --- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_util.h
> +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_util.h
> @@ -1,7 +1,7 @@
>  /*
>  * Copyright (c) 2016 MediaTek Inc.
>  * Author: PC Chen <[e-mail]>
> -*	Tiffany Lin <[e-mail]>
> +*		Tiffany Lin <[e-mail]>
>  *
>  * This program is free software; you can redistribute it and/or modify
>  * it under the terms of the GNU General Public License version 2 as
> @@ -26,6 +26,7 @@ struct mtk_vcodec_mem {
>  };
>  
>  struct mtk_vcodec_ctx;
> +struct mtk_vcodec_dev;
>  
>  extern int mtk_v4l2_dbg_level;
>  extern bool mtk_vcodec_dbg;
> @@ -84,4 +85,8 @@ int mtk_vcodec_mem_alloc(struct mtk_vcodec_ctx *data,
>  				struct mtk_vcodec_mem *mem);
>  void mtk_vcodec_mem_free(struct mtk_vcodec_ctx *data,
>  				struct mtk_vcodec_mem *mem);
> +void mtk_vcodec_set_curr_ctx(struct mtk_vcodec_dev *dev,
> +	struct mtk_vcodec_ctx *ctx);
> +struct mtk_vcodec_ctx *mtk_vcodec_get_curr_ctx(struct mtk_vcodec_dev *dev);
> +
>  #endif /* _MTK_VCODEC_UTIL_H_ */
> diff --git a/drivers/media/platform/mtk-vcodec/vdec_drv_base.h b/drivers/media/platform/mtk-vcodec/vdec_drv_base.h
> new file mode 100644
> index 0000000..7e4c1a9
> --- /dev/null
> +++ b/drivers/media/platform/mtk-vcodec/vdec_drv_base.h
> @@ -0,0 +1,56 @@
> +/*
> + * Copyright (c) 2016 MediaTek Inc.
> + * Author: PC Chen <[e-mail]>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#ifndef _VDEC_DRV_BASE_
> +#define _VDEC_DRV_BASE_
> +
> +#include "mtk_vcodec_drv.h"
> +
> +#include "vdec_drv_if.h"
> +
> +struct vdec_common_if {
> +	/**
> +	 * (*init)() - initialize decode driver
> +	 * @ctx     : [in] mtk v4l2 context
> +	 * @h_vdec  : [out] driver handle
> +	 */
> +	int (*init)(struct mtk_vcodec_ctx *ctx, unsigned long *h_vdec);
> +
> +	/**
> +	 * (*decode)() - trigger decode
> +	 * @h_vdec  : [in] driver handle
> +	 * @bs      : [in] input bitstream
> +	 * @fb      : [in] frame buffer to store decoded frame
> +	 * @res_chg : [out] resolution change happen
> +	 */
> +	int (*decode)(unsigned long h_vdec, struct mtk_vcodec_mem *bs,
> +		      struct vdec_fb *fb, bool *res_chg);
> +
> +	/**
> +	 * (*get_param)() - get driver's parameter
> +	 * @h_vdec : [in] driver handle
> +	 * @type   : [in] input parameter type
> +	 * @out    : [out] buffer to store query result
> +	 */
> +	int (*get_param)(unsigned long h_vdec, enum vdec_get_param_type type,
> +			 void *out);
> +
> +	/**
> +	 * (*deinit)() - deinitialize driver.
> +	 * @h_vdec : [in] driver handle to be deinit
> +	 */
> +	void (*deinit)(unsigned long h_vdec);
> +};
> +
> +#endif
> diff --git a/drivers/media/platform/mtk-vcodec/vdec_drv_if.c b/drivers/media/platform/mtk-vcodec/vdec_drv_if.c
> new file mode 100644
> index 0000000..8202b14
> --- /dev/null
> +++ b/drivers/media/platform/mtk-vcodec/vdec_drv_if.c
> @@ -0,0 +1,107 @@
> +/*
> + * Copyright (c) 2016 MediaTek Inc.
> + * Author: PC Chen <[e-mail]>
> + *         Tiffany Lin <[e-mail]>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/interrupt.h>
> +#include <linux/kernel.h>
> +#include <linux/slab.h>
> +
> +#include "vdec_drv_base.h"
> +#include "vdec_drv_if.h"
> +
> +#include "mtk_vcodec_dec_pm.h"
> +#include "mtk_vcodec_util.h"
> +#include "mtk_vpu.h"
> +
> +int vdec_if_init(struct mtk_vcodec_ctx *ctx, unsigned int fourcc)
> +{
> +	int ret = 0;
> +
> +	switch (fourcc) {
> +	case V4L2_PIX_FMT_H264:
> +	case V4L2_PIX_FMT_VP8:
> +	case V4L2_PIX_FMT_VP9:
> +	default:
> +		return -EINVAL;
> +	}
> +
> +	mtk_vdec_lock(ctx);
> +	mtk_vcodec_dec_clock_on(&ctx->dev->pm);
> +	ret = ctx->dec_if->init(ctx, &ctx->drv_handle);
> +	mtk_vcodec_dec_clock_off(&ctx->dev->pm);
> +	mtk_vdec_unlock(ctx);
> +
> +	return ret;
> +}
> +
> +int vdec_if_decode(struct mtk_vcodec_ctx *ctx, struct mtk_vcodec_mem *bs,
> +		   struct vdec_fb *fb, bool *res_chg)
> +{
> +	int ret = 0;
> +
> +	if (bs) {
> +		if ((bs->dma_addr & 63) != 0) {
> +			mtk_v4l2_err("bs dma_addr should 64 byte align");
> +			return -EINVAL;
> +		}
> +	}
> +
> +	if (fb) {
> +		if (((fb->base_y.dma_addr & 511) != 0) ||
> +		    ((fb->base_c.dma_addr & 511) != 0)) {
> +			mtk_v4l2_err("frame buffer dma_addr should 512 byte align");
> +			return -EINVAL;
> +		}
> +	}
> +
> +	mtk_vdec_lock(ctx);
> +
> +	mtk_vcodec_set_curr_ctx(ctx->dev, ctx);
> +	mtk_vcodec_dec_clock_on(&ctx->dev->pm);
> +	enable_irq(ctx->dev->dec_irq);
> +	ret = ctx->dec_if->decode(ctx->drv_handle, bs, fb, res_chg);
> +	disable_irq(ctx->dev->dec_irq);
> +	mtk_vcodec_dec_clock_off(&ctx->dev->pm);
> +	mtk_vcodec_set_curr_ctx(ctx->dev, NULL);
> +
> +	mtk_vdec_unlock(ctx);
> +
> +	return ret;
> +}
> +
> +int vdec_if_get_param(struct mtk_vcodec_ctx *ctx, enum vdec_get_param_type type,
> +		      void *out)
> +{
> +	int ret = 0;
> +
> +	mtk_vdec_lock(ctx);
> +	ret = ctx->dec_if->get_param(ctx->drv_handle, type, out);
> +	mtk_vdec_unlock(ctx);
> +
> +	return ret;
> +}
> +
> +void vdec_if_deinit(struct mtk_vcodec_ctx *ctx)
> +{
> +	if (ctx->drv_handle == 0)
> +		return;
> +
> +	mtk_vdec_lock(ctx);
> +	mtk_vcodec_dec_clock_on(&ctx->dev->pm);
> +	ctx->dec_if->deinit(ctx->drv_handle);
> +	mtk_vcodec_dec_clock_off(&ctx->dev->pm);
> +	mtk_vdec_unlock(ctx);
> +
> +	ctx->drv_handle = 0;
> +}
> diff --git a/drivers/media/platform/mtk-vcodec/vdec_drv_if.h b/drivers/media/platform/mtk-vcodec/vdec_drv_if.h
> new file mode 100644
> index 0000000..db6b520
> --- /dev/null
> +++ b/drivers/media/platform/mtk-vcodec/vdec_drv_if.h
> @@ -0,0 +1,101 @@
> +/*
> + * Copyright (c) 2016 MediaTek Inc.
> + * Author: PC Chen <[e-mail]>
> + *		   Tiffany Lin <[e-mail]>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#ifndef _VDEC_DRV_IF_H_
> +#define _VDEC_DRV_IF_H_
> +
> +#include "mtk_vcodec_drv.h"
> +#include "mtk_vcodec_dec.h"
> +#include "mtk_vcodec_util.h"
> +
> +
> +/**
> + * struct vdec_fb_status  - decoder frame buffer status
> + * @FB_ST_NORMAL	: initial state
> + * @FB_ST_DISPLAY	: frmae buffer is ready to be displayed
> + * @FB_ST_FREE		: frame buffer is not used by decoder any more
> + */
> +enum vdec_fb_status {
> +	FB_ST_NORMAL		= 0,
> +	FB_ST_DISPLAY		= (1 << 0),
> +	FB_ST_FREE		= (1 << 1)
> +};
> +
> +/* For GET_PARAM_DISP_FRAME_BUFFER and GET_PARAM_FREE_FRAME_BUFFER,
> + * the caller does not own the returned buffer. The buffer will not be
> + *				released before vdec_if_deinit.
> + * GET_PARAM_DISP_FRAME_BUFFER	: get next displayable frame buffer,
> + *				struct vdec_fb**
> + * GET_PARAM_FREE_FRAME_BUFFER	: get non-referenced framebuffer, vdec_fb**
> + * GET_PARAM_PIC_INFO		: get picture info, struct vdec_pic_info*
> + * GET_PARAM_CROP_INFO		: get crop info, struct v4l2_crop*
> + * GET_PARAM_DPB_SIZE		: get dpb size, unsigned int*
> + */
> +enum vdec_get_param_type {
> +	GET_PARAM_DISP_FRAME_BUFFER,
> +	GET_PARAM_FREE_FRAME_BUFFER,
> +	GET_PARAM_PIC_INFO,
> +	GET_PARAM_CROP_INFO,
> +	GET_PARAM_DPB_SIZE
> +};
> +
> +/**
> + * struct vdec_fb_node  - decoder frame buffer node
> + * @list	: list to hold this node
> + * @fb	: point to frame buffer (vdec_fb), fb could point to frame buffer and
> + *	working buffer this is for maintain buffers in different state
> + */
> +struct vdec_fb_node {
> +	struct list_head list;
> +	struct vdec_fb *fb;
> +};
> +
> +/**
> + * vdec_if_init() - initialize decode driver
> + * @ctx	: [in] v4l2 context
> + * @fourcc	: [in] video format fourcc, V4L2_PIX_FMT_H264/VP8/VP9..
> + */
> +int vdec_if_init(struct mtk_vcodec_ctx *ctx, unsigned int fourcc);
> +
> +/**
> + * vdec_if_deinit() - deinitialize decode driver
> + * @ctx	: [in] v4l2 context
> + *
> + */
> +void vdec_if_deinit(struct mtk_vcodec_ctx *ctx);
> +
> +/**
> + * vdec_if_decode() - trigger decode
> + * @ctx	: [in] v4l2 context
> + * @bs	: [in] input bitstream
> + * @fb	: [in] frame buffer to store decoded frame, when null menas parse
> + *	header only
> + * @res_chg	: [out] resolution change happens if current bs have different
> + *	picture width/height
> + * Note: To flush the decoder when reaching EOF, set input bitstream as NULL.
> + */
> +int vdec_if_decode(struct mtk_vcodec_ctx *ctx, struct mtk_vcodec_mem *bs,
> +		   struct vdec_fb *fb, bool *res_chg);
> +
> +/**
> + * vdec_if_get_param() - get driver's parameter
> + * @ctx	: [in] v4l2 context
> + * @type	: [in] input parameter type
> + * @out	: [out] buffer to store query result
> + */
> +int vdec_if_get_param(struct mtk_vcodec_ctx *ctx, enum vdec_get_param_type type,
> +		      void *out);
> +
> +#endif
> diff --git a/drivers/media/platform/mtk-vcodec/vdec_ipi_msg.h b/drivers/media/platform/mtk-vcodec/vdec_ipi_msg.h
> new file mode 100644
> index 0000000..5a8a629
> --- /dev/null
> +++ b/drivers/media/platform/mtk-vcodec/vdec_ipi_msg.h
> @@ -0,0 +1,103 @@
> +/*
> + * Copyright (c) 2016 MediaTek Inc.
> + * Author: PC Chen <[e-mail]>
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#ifndef _VDEC_IPI_MSG_H_
> +#define _VDEC_IPI_MSG_H_
> +
> +/**
> + * enum vdec_ipi_msgid - message id between AP and VPU
> + * @AP_IPIMSG_XXX	: AP to VPU cmd message id
> + * @VPU_IPIMSG_XXX_ACK	: VPU ack AP cmd message id
> + */
> +enum vdec_ipi_msgid {
> +	AP_IPIMSG_DEC_INIT = 0xA000,
> +	AP_IPIMSG_DEC_START = 0xA001,
> +	AP_IPIMSG_DEC_END = 0xA002,
> +	AP_IPIMSG_DEC_DEINIT = 0xA003,
> +	AP_IPIMSG_DEC_RESET = 0xA004,
> +
> +	VPU_IPIMSG_DEC_INIT_ACK = 0xB000,
> +	VPU_IPIMSG_DEC_START_ACK = 0xB001,
> +	VPU_IPIMSG_DEC_END_ACK = 0xB002,
> +	VPU_IPIMSG_DEC_DEINIT_ACK = 0xB003,
> +	VPU_IPIMSG_DEC_RESET_ACK = 0xB004,
> +};
> +
> +/**
> + * struct vdec_ap_ipi_cmd - generic AP to VPU ipi command format
> + * @msg_id	: vdec_ipi_msgid
> + * @vpu_inst_addr	: VPU decoder instance address
> + */
> +struct vdec_ap_ipi_cmd {
> +	uint32_t msg_id;
> +	uint32_t vpu_inst_addr;
> +};
> +
> +/**
> + * struct vdec_vpu_ipi_ack - generic VPU to AP ipi command format
> + * @msg_id	: vdec_ipi_msgid
> + * @status	: VPU exeuction result
> + * @ap_inst_addr	: AP video decoder instance address
> + */
> +struct vdec_vpu_ipi_ack {
> +	uint32_t msg_id;
> +	int32_t status;
> +	uint64_t ap_inst_addr;
> +};
> +
> +/**
> + * struct vdec_ap_ipi_init - for AP_IPIMSG_DEC_INIT
> + * @msg_id	: AP_IPIMSG_DEC_INIT
> + * @reserved	: Reserved field
> + * @ap_inst_addr	: AP video decoder instance address
> + */
> +struct vdec_ap_ipi_init {
> +	uint32_t msg_id;
> +	uint32_t reserved;
> +	uint64_t ap_inst_addr;
> +};
> +
> +/**
> + * struct vdec_ap_ipi_dec_start - for AP_IPIMSG_DEC_START
> + * @msg_id	: AP_IPIMSG_DEC_START
> + * @vpu_inst_addr	: VPU decoder instance address
> + * @data	: Header info
> + *	H264 decoder [0]:buf_sz [1]:nal_start
> + *	VP8 decoder  [0]:width/height
> + *	VP9 decoder  [0]:profile, [1][2] width/height
> + * @reserved	: Reserved field
> + */
> +struct vdec_ap_ipi_dec_start {
> +	uint32_t msg_id;
> +	uint32_t vpu_inst_addr;
> +	uint32_t data[3];
> +	uint32_t reserved;
> +};
> +
> +/**
> + * struct vdec_vpu_ipi_init_ack - for VPU_IPIMSG_DEC_INIT_ACK
> + * @msg_id	: VPU_IPIMSG_DEC_INIT_ACK
> + * @status	: VPU exeuction result
> + * @ap_inst_addr	: AP vcodec_vpu_inst instance address
> + * @vpu_inst_addr	: VPU decoder instance address
> + */
> +struct vdec_vpu_ipi_init_ack {
> +	uint32_t msg_id;
> +	int32_t status;
> +	uint64_t ap_inst_addr;
> +	uint32_t vpu_inst_addr;
> +};
> +
> +#endif
> 

Regards,

	Hans

tiffany.lin Aug. 1, 2016, 9:38 a.m. UTC | #2

Hi Hans,

On Fri, 2016-07-08 at 13:06 +0200, Hans Verkuil wrote:
> On 05/30/2016 02:29 PM, Tiffany Lin wrote:
> > Add v4l2 layer decoder driver for MT8173
> > 
> > Signed-off-by: Tiffany Lin <[e-mail]>
> > ---
> >  drivers/media/platform/mtk-vcodec/Makefile         |   10 +-
> >  drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.c | 1348 ++++++++++++++++++++
> >  drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.h |   88 ++
> >  .../media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c |  408 ++++++
> >  .../media/platform/mtk-vcodec/mtk_vcodec_dec_pm.c  |  206 +++
> >  .../media/platform/mtk-vcodec/mtk_vcodec_dec_pm.h  |   28 +
> >  drivers/media/platform/mtk-vcodec/mtk_vcodec_drv.h |   88 +-
> >  .../media/platform/mtk-vcodec/mtk_vcodec_intr.c    |    4 +-
> >  .../media/platform/mtk-vcodec/mtk_vcodec_intr.h    |    2 +-
> >  .../media/platform/mtk-vcodec/mtk_vcodec_util.c    |   31 +-
> >  .../media/platform/mtk-vcodec/mtk_vcodec_util.h    |    7 +-
> >  drivers/media/platform/mtk-vcodec/vdec_drv_base.h  |   56 +
> >  drivers/media/platform/mtk-vcodec/vdec_drv_if.c    |  107 ++
> >  drivers/media/platform/mtk-vcodec/vdec_drv_if.h    |  101 ++
> >  drivers/media/platform/mtk-vcodec/vdec_ipi_msg.h   |  103 ++
> >  15 files changed, 2569 insertions(+), 18 deletions(-)
> >  create mode 100644 drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.c
> >  create mode 100644 drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.h
> >  create mode 100644 drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c
> >  create mode 100644 drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_pm.c
> >  create mode 100644 drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_pm.h
> >  create mode 100644 drivers/media/platform/mtk-vcodec/vdec_drv_base.h
> >  create mode 100644 drivers/media/platform/mtk-vcodec/vdec_drv_if.c
> >  create mode 100644 drivers/media/platform/mtk-vcodec/vdec_drv_if.h
> >  create mode 100644 drivers/media/platform/mtk-vcodec/vdec_ipi_msg.h
> > 
> > diff --git a/drivers/media/platform/mtk-vcodec/Makefile b/drivers/media/platform/mtk-vcodec/Makefile
> > index dc5cb00..4c8ed2f 100644
> > --- a/drivers/media/platform/mtk-vcodec/Makefile
> > +++ b/drivers/media/platform/mtk-vcodec/Makefile
> > @@ -1,7 +1,13 @@
> >  
> >  
> > -obj-$(CONFIG_VIDEO_MEDIATEK_VCODEC) += mtk-vcodec-enc.o mtk-vcodec-common.o
> > -
> > +obj-$(CONFIG_VIDEO_MEDIATEK_VCODEC) += mtk-vcodec-dec.o \
> > +				       mtk-vcodec-enc.o \
> > +				       mtk-vcodec-common.o
> > +
> > +mtk-vcodec-dec-y := mtk_vcodec_dec_drv.o \
> > +		vdec_drv_if.o \
> > +		mtk_vcodec_dec.o \
> > +		mtk_vcodec_dec_pm.o \
> >  
> >  
> >  mtk-vcodec-enc-y := venc/venc_vp8_if.o \
> > diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.c b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.c
> > new file mode 100644
> > index 0000000..792858a
> > --- /dev/null
> > +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.c
> > @@ -0,0 +1,1348 @@
> > +/*
> > +* Copyright (c) 2016 MediaTek Inc.
> > +* Author: PC Chen <[e-mail]>
> > +*         Tiffany Lin <[e-mail]>
> > +*
> > +* This program is free software; you can redistribute it and/or modify
> > +* it under the terms of the GNU General Public License version 2 as
> > +* published by the Free Software Foundation.
> > +*
> > +* This program is distributed in the hope that it will be useful,
> > +* but WITHOUT ANY WARRANTY; without even the implied warranty of
> > +* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> > +* GNU General Public License for more details.
> > +*/
> > +
> > +#include <media/v4l2-event.h>
> > +#include <media/v4l2-mem2mem.h>
> > +#include <media/videobuf2-dma-contig.h>
> > +
> > +#include "mtk_vcodec_drv.h"
> > +#include "mtk_vcodec_dec.h"
> > +#include "mtk_vcodec_intr.h"
> > +#include "mtk_vcodec_util.h"
> > +#include "vdec_drv_if.h"
> > +#include "mtk_vcodec_dec_pm.h"
> > +
> > +#define OUT_FMT_IDX	0
> > +#define CAP_FMT_IDX	3
> > +
> > +#define MTK_VDEC_MIN_W	64U
> > +#define MTK_VDEC_MIN_H	64U
> > +#define DFT_CFG_WIDTH	MTK_VDEC_MIN_W
> > +#define DFT_CFG_HEIGHT	MTK_VDEC_MIN_H
> > +
> > +static struct mtk_video_fmt mtk_video_formats[] = {
> > +	{
> > +		.fourcc = V4L2_PIX_FMT_H264,
> > +		.type = MTK_FMT_DEC,
> > +		.num_planes = 1,
> > +	},
> > +	{
> > +		.fourcc = V4L2_PIX_FMT_VP8,
> > +		.type = MTK_FMT_DEC,
> > +		.num_planes = 1,
> > +	},
> > +	{
> > +		.fourcc = V4L2_PIX_FMT_VP9,
> > +		.type = MTK_FMT_DEC,
> > +		.num_planes = 1,
> > +	},
> > +	{
> > +		.fourcc = V4L2_PIX_FMT_MT21,
> > +		.type = MTK_FMT_FRAME,
> > +		.num_planes = 2,
> > +	},
> > +};
> > +
> > +static const struct mtk_codec_framesizes mtk_vdec_framesizes[] = {
> > +	{
> > +		.fourcc	= V4L2_PIX_FMT_H264,
> > +		.stepwise = {  MTK_VDEC_MIN_W, MTK_VDEC_MAX_W, 16,
> > +				MTK_VDEC_MIN_H, MTK_VDEC_MAX_H, 16 },
> > +	},
> > +	{
> > +		.fourcc	= V4L2_PIX_FMT_VP8,
> > +		.stepwise = {  MTK_VDEC_MIN_W, MTK_VDEC_MAX_W, 16,
> > +				MTK_VDEC_MIN_H, MTK_VDEC_MAX_H, 16 },
> > +	},
> > +	{
> > +		.fourcc = V4L2_PIX_FMT_VP9,
> > +		.stepwise = {  MTK_VDEC_MIN_W, MTK_VDEC_MAX_W, 16,
> > +				MTK_VDEC_MIN_H, MTK_VDEC_MAX_H, 16 },
> > +	},
> > +};
> > +
> > +#define NUM_SUPPORTED_FRAMESIZE ARRAY_SIZE(mtk_vdec_framesizes)
> > +#define NUM_FORMATS ARRAY_SIZE(mtk_video_formats)
> > +
> > +static struct mtk_video_fmt *mtk_vdec_find_format(struct v4l2_format *f)
> > +{
> > +	struct mtk_video_fmt *fmt;
> > +	unsigned int k;
> > +
> > +	for (k = 0; k < NUM_FORMATS; k++) {
> > +		fmt = &mtk_video_formats[k];
> > +		if (fmt->fourcc == f->fmt.pix_mp.pixelformat)
> > +			return fmt;
> > +	}
> > +
> > +	return NULL;
> > +}
> > +
> > +static struct mtk_q_data *mtk_vdec_get_q_data(struct mtk_vcodec_ctx *ctx,
> > +					      enum v4l2_buf_type type)
> > +{
> > +	if (V4L2_TYPE_IS_OUTPUT(type))
> > +		return &ctx->q_data[MTK_Q_DATA_SRC];
> > +
> > +	return &ctx->q_data[MTK_Q_DATA_DST];
> > +}
> > +
> > +/* This function is try to clean all display buffer, the buffer will return in
> 
> s/is try/tries/
> s/buffer/buffers/ (2 times)
> 
> checkpatch should complain about this comment block format ('/*' should be on
> its own line). Please run checkpatch to double check.
> 
> > + * display order.
> > + * Note the buffer return from codec driver may still in driver's reference
> 
> s/buffer return/buffers returned/
> s/still/still be/
> 

Will fix this in next version.

> > + * list.
> > + */
> > +static struct vb2_buffer *get_display_buffer(struct mtk_vcodec_ctx *ctx)
> > +{
> > +	struct vdec_fb *disp_frame_buffer = NULL;
> > +	struct mtk_video_dec_buf *dstbuf;
> > +
> > +	mtk_v4l2_debug(3, "[%d]", ctx->id);
> > +	if (vdec_if_get_param(ctx,
> > +			GET_PARAM_DISP_FRAME_BUFFER,
> > +			&disp_frame_buffer)) {
> > +		mtk_v4l2_err("[%d]Cannot get param : GET_PARAM_DISP_FRAME_BUFFER",
> > +			ctx->id);
> > +		return NULL;
> > +	}
> > +
> > +	if (disp_frame_buffer == NULL) {
> > +		mtk_v4l2_debug(3, "No display frame buffer");
> > +		return NULL;
> > +	}
> > +
> > +	dstbuf = container_of(disp_frame_buffer, struct mtk_video_dec_buf,
> > +				frame_buffer);
> > +	mutex_lock(&ctx->lock);
> > +	if (dstbuf->used) {
> > +		vb2_set_plane_payload(&dstbuf->vb.vb2_buf, 0,
> > +					ctx->picinfo.y_bs_sz);
> > +		vb2_set_plane_payload(&dstbuf->vb.vb2_buf, 1,
> > +					ctx->picinfo.c_bs_sz);
> > +
> > +		dstbuf->ready_to_display = true;
> > +
> > +		mtk_v4l2_debug(2,
> > +				"[%d]status=%x queue id=%d to done_list %d",
> > +				ctx->id, disp_frame_buffer->status,
> > +				dstbuf->vb.vb2_buf.index,
> > +				dstbuf->queued_in_vb2);
> > +
> > +		v4l2_m2m_buf_done(&dstbuf->vb, VB2_BUF_STATE_DONE);
> > +		ctx->decoded_frame_cnt++;
> > +	}
> > +	mutex_unlock(&ctx->lock);
> > +	return &dstbuf->vb.vb2_buf;
> > +}
> > +
> > +/* This function is try to clean all capture buffers that is not used as
> 
> s/is try/tries/
> s/is not/are not/
> 
> > + * reference buffer by codec driver any more
> 
> buffers
> 
> > + * In this case, we need re-queue buffer to vb2 buffer if user space
> > + * already return this buffer to v4l2 or this buffer is just the output of
> 
> returns
> 
> > + * previous sps/pps/resolution change decode, or do nothing if user
> > + * space still own this buffer
> 
> owns
> 

Will fix this in next version.

> > + */
> > +static struct vb2_buffer *get_free_buffer(struct mtk_vcodec_ctx *ctx)
> > +{
> > +	struct mtk_video_dec_buf *dstbuf;
> > +	struct vdec_fb *free_frame_buffer = NULL;
> > +
> > +	if (vdec_if_get_param(ctx,
> > +				GET_PARAM_FREE_FRAME_BUFFER,
> > +				&free_frame_buffer)) {
> > +		mtk_v4l2_err("[%d] Error!! Cannot get param", ctx->id);
> > +		return NULL;
> > +	}
> > +	if (free_frame_buffer == NULL) {
> > +		mtk_v4l2_debug(3, " No free frame buffer");
> > +		return NULL;
> > +	}
> > +
> > +	mtk_v4l2_debug(3, "[%d] tmp_frame_addr = 0x%p",
> > +			ctx->id, free_frame_buffer);
> > +
> > +	dstbuf = container_of(free_frame_buffer, struct mtk_video_dec_buf,
> > +				frame_buffer);
> > +
> > +	mutex_lock(&ctx->lock);
> > +	if (dstbuf->used) {
> > +		if ((dstbuf->queued_in_vb2) &&
> > +		    (dstbuf->queued_in_v4l2) &&
> > +		    (free_frame_buffer->status == FB_ST_FREE)) {
> > +			/* After decode sps/pps or non-display buffer, we dont
> 
> don't
> 
> > +			 * need to return capture buffer to user space, but
> > +			 * just re-queue this capture buffer to vb2 queue.
> 
> > +			 * This reduce overheads that dq/q unused capture
> > +			 * buffer We use queued_in_vb2 to mark this buffer
> > +			 * is from decode output, not q from user space.
> 
> garbled comment. Not sure what is meant here.
> 
Will fix and refine comment in next version

> > +			 */
> > +			mtk_v4l2_debug(2,
> > +				"[%d]status=%x queue id=%d to rdy_queue %d",
> > +				ctx->id, free_frame_buffer->status,
> > +				dstbuf->vb.vb2_buf.index,
> > +				dstbuf->queued_in_vb2);
> > +			v4l2_m2m_buf_queue(ctx->m2m_ctx, &dstbuf->vb);
> > +		} else if ((dstbuf->queued_in_vb2 == false) &&
> > +			   (dstbuf->queued_in_v4l2 == true)) {
> > +			/* If buffer in v4l2 driver but not in vb2 queue yet,
> > +			 * and we get this buffer from free_list, it means
> > +			 * that codec driver do not use this buffer as
> > +			 * reference buffer anymore. We should q buffer to vb2
> > +			 * queue, so later work thread could get this buffer
> > +			 * for decode In this sate, queued_in_vb2 = false
> 
> s/sate/case/
> 
> > +			 * menas this buffer is not from previous decode output
> 
> means
> 
Will fix this in next version.

> > +			 */
> > +			mtk_v4l2_debug(2,
> > +					"[%d]status=%x queue id=%d to rdy_queue",
> > +					ctx->id, free_frame_buffer->status,
> > +					dstbuf->vb.vb2_buf.index);
> > +			v4l2_m2m_buf_queue(ctx->m2m_ctx, &dstbuf->vb);
> > +			dstbuf->queued_in_vb2 = true;
> > +		} else {
> > +			/* Codec driver do not need to reference this capture
> > +			 * buffer and this buffer is not in v4l2 driver.
> > +			 * Then we dont need to do any thing, just add log when
> 
> don't
> 
Will fix this in next version.

> > +			 * we need to debug buffer flow.
> > +			 * When this buffer q from user space, it could
> > +			 * directly q to vb2 buffer
> > +			 */
> > +			mtk_v4l2_debug(3, "[%d]status=%x err queue id=%d %d %d",
> > +					ctx->id, free_frame_buffer->status,
> > +					dstbuf->vb.vb2_buf.index,
> > +					dstbuf->queued_in_vb2,
> > +					dstbuf->queued_in_v4l2);
> > +		}
> > +		dstbuf->used = false;
> > +	}
> > +	mutex_unlock(&ctx->lock);
> > +	return &dstbuf->vb.vb2_buf;
> > +}
> > +
> > +static void clean_display_buffer(struct mtk_vcodec_ctx *ctx)
> > +{
> > +	struct vb2_buffer *framptr;
> > +
> > +	do {
> > +		framptr = get_display_buffer(ctx);
> > +	} while (framptr);
> > +}
> > +
> > +static void clean_free_buffer(struct mtk_vcodec_ctx *ctx)
> > +{
> > +	struct vb2_buffer *framptr;
> > +
> > +	do {
> > +		framptr = get_free_buffer(ctx);
> > +	} while (framptr);
> > +}
> > +
> > +static int mtk_vdec_queue_res_chg_event(struct mtk_vcodec_ctx *ctx)
> 
> This can be a void function.
> 
Will fix this in next version.

> > +{
> > +	static const struct v4l2_event ev_src_ch = {
> > +		.type = V4L2_EVENT_SOURCE_CHANGE,
> > +		.u.src_change.changes =
> > +		V4L2_EVENT_SRC_CH_RESOLUTION,
> > +	};
> > +
> > +	mtk_v4l2_debug(1, "[%d]", ctx->id);
> > +	v4l2_event_queue_fh(&ctx->fh, &ev_src_ch);
> > +
> > +	return 0;
> > +}
> > +
> > +static void mtk_vdec_flush_decoder(struct mtk_vcodec_ctx *ctx)
> > +{
> > +	bool res_chg;
> > +	int ret = 0;
> > +
> > +	ret = vdec_if_decode(ctx, NULL, NULL, &res_chg);
> > +	if (ret)
> > +		mtk_v4l2_err("DecodeFinal failed, ret=%d", ret);
> > +
> > +	clean_display_buffer(ctx);
> > +	clean_free_buffer(ctx);
> > +}
> > +
> > +static void mtk_vdec_pic_info_update(struct mtk_vcodec_ctx *ctx)
> > +{
> > +	unsigned int dpbsize = 0;
> > +	int ret;
> > +
> > +	if (vdec_if_get_param(ctx,
> > +				GET_PARAM_PIC_INFO,
> > +				&ctx->last_decoded_picinfo)) {
> > +		mtk_v4l2_err("[%d]Error!! Cannot get param : GET_PARAM_PICTURE_INFO ERR",
> > +				ctx->id);
> > +		return;
> > +	}
> > +
> > +	if (ctx->last_decoded_picinfo.pic_w == 0 ||
> > +		ctx->last_decoded_picinfo.pic_h == 0 ||
> > +		ctx->last_decoded_picinfo.buf_w == 0 ||
> > +		ctx->last_decoded_picinfo.buf_h == 0) {
> > +		mtk_v4l2_err("Cannot get correct pic info");
> > +		return;
> > +	}
> > +
> > +	if ((ctx->last_decoded_picinfo.pic_w == ctx->picinfo.pic_w) ||
> > +	    (ctx->last_decoded_picinfo.pic_h == ctx->picinfo.pic_h))
> > +		return;
> > +
> > +	mtk_v4l2_debug(1,
> > +			"[%d]-> new(%d,%d), old(%d,%d), real(%d,%d)",
> > +			ctx->id, ctx->last_decoded_picinfo.pic_w,
> > +			ctx->last_decoded_picinfo.pic_h,
> > +			ctx->picinfo.pic_w, ctx->picinfo.pic_h,
> > +			ctx->last_decoded_picinfo.buf_w,
> > +			ctx->last_decoded_picinfo.buf_h);
> > +
> > +	ret = vdec_if_get_param(ctx, GET_PARAM_DPB_SIZE, &dpbsize);
> > +	if (dpbsize == 0)
> > +		mtk_v4l2_err("Incorrect dpb size, ret=%d", ret);
> > +
> > +	ctx->dpb_size = dpbsize;
> > +}
> > +
> > +static void mtk_vdec_worker(struct work_struct *work)
> > +{
> > +	struct mtk_vcodec_ctx *ctx = container_of(work, struct mtk_vcodec_ctx,
> > +				decode_work);
> > +	struct mtk_vcodec_dev *dev = ctx->dev;
> > +	struct vb2_buffer *src_buf, *dst_buf;
> > +	struct mtk_vcodec_mem buf;
> > +	struct vdec_fb *pfb;
> > +	bool res_chg = false;
> > +	int ret;
> > +	struct mtk_video_dec_buf *dst_buf_info, *src_buf_info;
> > +	struct vb2_v4l2_buffer *dst_vb2_v4l2, *src_vb2_v4l2;
> > +
> > +	src_buf = v4l2_m2m_next_src_buf(ctx->m2m_ctx);
> > +	if (src_buf == NULL) {
> > +		v4l2_m2m_job_finish(dev->m2m_dev_dec, ctx->m2m_ctx);
> > +		mtk_v4l2_debug(1, "[%d] src_buf empty!!", ctx->id);
> > +		return;
> > +	}
> > +
> > +	dst_buf = v4l2_m2m_next_dst_buf(ctx->m2m_ctx);
> > +	if (dst_buf == NULL) {
> > +		v4l2_m2m_job_finish(dev->m2m_dev_dec, ctx->m2m_ctx);
> > +		mtk_v4l2_debug(1, "[%d] dst_buf empty!!", ctx->id);
> > +		return;
> > +	}
> > +
> > +	src_vb2_v4l2 = container_of(src_buf, struct vb2_v4l2_buffer, vb2_buf);
> > +	src_buf_info = container_of(src_vb2_v4l2, struct mtk_video_dec_buf, vb);
> > +
> > +	dst_vb2_v4l2 = container_of(dst_buf, struct vb2_v4l2_buffer, vb2_buf);
> > +	dst_buf_info = container_of(dst_vb2_v4l2, struct mtk_video_dec_buf, vb);
> > +
> > +	buf.va = vb2_plane_vaddr(src_buf, 0);
> > +	buf.dma_addr = vb2_dma_contig_plane_dma_addr(src_buf, 0);
> > +	buf.size = (size_t)src_buf->planes[0].bytesused;
> > +	if (!buf.va) {
> > +		v4l2_m2m_job_finish(dev->m2m_dev_dec, ctx->m2m_ctx);
> > +		mtk_v4l2_err("[%d] id=%d src_addr is NULL!!",
> > +				ctx->id, src_buf->index);
> > +		return;
> > +	}
> > +
> > +	pfb = &dst_buf_info->frame_buffer;
> > +	pfb->base_y.va = vb2_plane_vaddr(dst_buf, 0);
> > +	pfb->base_y.dma_addr = vb2_dma_contig_plane_dma_addr(dst_buf, 0);
> > +	pfb->base_y.size = ctx->picinfo.y_bs_sz + ctx->picinfo.y_len_sz;
> > +
> > +	pfb->base_c.va = vb2_plane_vaddr(dst_buf, 1);
> > +	pfb->base_c.dma_addr = vb2_dma_contig_plane_dma_addr(dst_buf, 1);
> > +	pfb->base_c.size = ctx->picinfo.c_bs_sz + ctx->picinfo.c_len_sz;
> > +	pfb->status = 0;
> > +	mtk_v4l2_debug(3, "===>[%d] vdec_if_decode() ===>", ctx->id);
> > +	mtk_v4l2_debug(3, "[%d] Bitstream VA=%p DMA=%llx Size=0x%lx vb=%p",
> > +			ctx->id, buf.va, (u64)buf.dma_addr, buf.size, src_buf);
> > +
> > +	mtk_v4l2_debug(3,
> > +			"id=%d Framebuf  pfb=%p VA=%p Y_DMA=%llx C_DMA=%llx Size=0x%lx",
> > +			dst_buf->index, pfb,
> > +			pfb->base_y.va, (u64)pfb->base_y.dma_addr,
> > +			(u64)pfb->base_c.dma_addr, pfb->base_y.size);
> > +
> > +	if (src_buf_info->lastframe) {
> > +		/* update src buf status */
> > +		src_buf = v4l2_m2m_src_buf_remove(ctx->m2m_ctx);
> > +		src_buf_info->lastframe = false;
> > +		v4l2_m2m_buf_done(&src_buf_info->vb, VB2_BUF_STATE_DONE);
> > +
> > +		/* update dst buf status */
> > +		dst_buf = v4l2_m2m_dst_buf_remove(ctx->m2m_ctx);
> > +		dst_buf_info->used = false;
> > +
> > +		vdec_if_decode(ctx, NULL, NULL, &res_chg);
> > +		clean_display_buffer(ctx);
> > +		vb2_set_plane_payload(&dst_buf_info->vb.vb2_buf, 0, 0);
> > +		vb2_set_plane_payload(&dst_buf_info->vb.vb2_buf, 1, 0);
> > +		v4l2_m2m_buf_done(&dst_buf_info->vb, VB2_BUF_STATE_DONE);
> > +		clean_free_buffer(ctx);
> 
> Just call v4l2_m2m_job_finish(dev->m2m_dev_dec, ctx->m2m_ctx); here and return.
> 
> 
> > +	} else {
> 
> This can now have one less TAB.
> 
Got it. Will fix this in next version.

> > +		dst_buf_info->vb.vb2_buf.timestamp
> > +				= src_buf_info->vb.vb2_buf.timestamp;
> > +		dst_buf_info->vb.timecode
> > +				= src_buf_info->vb.timecode;
> > +		mutex_lock(&ctx->lock);
> > +		dst_buf_info->used = true;
> > +		mutex_unlock(&ctx->lock);
> > +		src_buf_info->used = true;
> > +
> > +		ret = vdec_if_decode(ctx, &buf, pfb, &res_chg);
> > +
> > +		if (ret) {
> > +			mtk_v4l2_err(
> > +				" <===[%d], src_buf[%d]%d sz=0x%zx pts=%llu dst_buf[%d] vdec_if_decode() ret=%d res_chg=%d===>",
> > +				ctx->id,
> > +				src_buf->index,
> > +				src_buf_info->lastframe,
> > +				buf.size,
> > +				src_buf_info->vb.vb2_buf.timestamp,
> > +				dst_buf->index,
> > +				ret, res_chg);
> > +			src_buf = v4l2_m2m_src_buf_remove(ctx->m2m_ctx);
> > +			v4l2_m2m_buf_done(&src_buf_info->vb,
> > +					VB2_BUF_STATE_ERROR);
> > +		} else if (res_chg == false) {
> > +			/* we only return src buffer with VB2_BUF_STATE_DONE
> > +			  * when decode success without resolution change
> > +			  */
> > +			src_buf = v4l2_m2m_src_buf_remove(ctx->m2m_ctx);
> > +			v4l2_m2m_buf_done(&src_buf_info->vb,
> > +					VB2_BUF_STATE_DONE);
> > +		}
> > +
> > +		dst_buf = v4l2_m2m_dst_buf_remove(ctx->m2m_ctx);
> > +		clean_display_buffer(ctx);
> > +		clean_free_buffer(ctx);
> > +
> > +		if (!ret && res_chg) {
> > +			mtk_vdec_pic_info_update(ctx);
> > +			/*
> > +			 * On encountering a resolution change in the stream.
> > +			 * The driver must first process and decode all
> > +			 * remaining buffers from before the resolution change
> > +			 * point, so call flush decode here
> > +			 */
> > +			mtk_vdec_flush_decoder(ctx);
> > +			/*
> > +			 * After all buffers containing decoded frames from
> > +			 * before the resolution change point ready to be
> > +			 * dequeued on the CAPTURE queue, the driver sends a
> > +			 * V4L2_EVENT_SOURCE_CHANGE event for source change
> > +			 * type V4L2_EVENT_SRC_CH_RESOLUTION
> > +			 */
> > +			mtk_vdec_queue_res_chg_event(ctx);
> > +		}
> > +	}
> > +
> > +	v4l2_m2m_job_finish(dev->m2m_dev_dec, ctx->m2m_ctx);
> > +}
> > +
> > +void mtk_vdec_unlock(struct mtk_vcodec_ctx *ctx)
> > +{
> > +	mutex_unlock(&ctx->dev->dec_mutex);
> > +}
> > +
> > +void mtk_vdec_lock(struct mtk_vcodec_ctx *ctx)
> > +{
> > +	mutex_lock(&ctx->dev->dec_mutex);
> > +}
> > +
> > +void mtk_vcodec_vdec_release(struct mtk_vcodec_ctx *ctx)
> > +{
> > +	vdec_if_deinit(ctx);
> > +	ctx->state = MTK_STATE_FREE;
> > +}
> > +
> > +void mtk_vcodec_dec_set_default_params(struct mtk_vcodec_ctx *ctx)
> > +{
> > +	struct mtk_q_data *q_data;
> > +
> > +	ctx->m2m_ctx->q_lock = &ctx->dev->dev_mutex;
> > +	ctx->fh.m2m_ctx = ctx->m2m_ctx;
> > +	ctx->fh.ctrl_handler = &ctx->ctrl_hdl;
> > +	INIT_WORK(&ctx->decode_work, mtk_vdec_worker);
> > +	ctx->colorspace = V4L2_COLORSPACE_REC709;
> > +	ctx->ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT;
> > +	ctx->quantization = V4L2_QUANTIZATION_DEFAULT;
> > +	ctx->xfer_func = V4L2_XFER_FUNC_DEFAULT;
> > +
> > +	q_data = &ctx->q_data[MTK_Q_DATA_SRC];
> > +	memset(q_data, 0, sizeof(struct mtk_q_data));
> > +	q_data->visible_width = DFT_CFG_WIDTH;
> > +	q_data->visible_height = DFT_CFG_HEIGHT;
> > +	q_data->fmt = &mtk_video_formats[OUT_FMT_IDX];
> > +	q_data->field = V4L2_FIELD_NONE;
> > +
> > +	ctx->q_data[MTK_Q_DATA_DST].sizeimage[0] =
> > +		DFT_CFG_WIDTH * DFT_CFG_HEIGHT;
> > +	ctx->q_data[MTK_Q_DATA_DST].bytesperline[0] = 0;
> > +
> > +	q_data = &ctx->q_data[MTK_Q_DATA_DST];
> > +	memset(q_data, 0, sizeof(struct mtk_q_data));
> > +	q_data->visible_width = DFT_CFG_WIDTH;
> > +	q_data->visible_height = DFT_CFG_HEIGHT;
> > +	q_data->coded_width = DFT_CFG_WIDTH;
> > +	q_data->coded_height = DFT_CFG_HEIGHT;
> > +	q_data->fmt = &mtk_video_formats[CAP_FMT_IDX];
> > +	q_data->field = V4L2_FIELD_NONE;
> > +
> > +	v4l_bound_align_image(&q_data->coded_width,
> > +				MTK_VDEC_MIN_W,
> > +				MTK_VDEC_MAX_W, 4,
> > +				&q_data->coded_height,
> > +				MTK_VDEC_MIN_H,
> > +				MTK_VDEC_MAX_H, 5, 6);
> > +
> > +	q_data->sizeimage[0] = q_data->coded_width * q_data->coded_height;
> > +	q_data->bytesperline[0] = q_data->coded_width;
> > +	q_data->sizeimage[1] = q_data->sizeimage[0] / 2;
> > +	q_data->bytesperline[1] = q_data->coded_width;
> > +}
> > +
> > +static int vidioc_vdec_qbuf(struct file *file, void *priv,
> > +			    struct v4l2_buffer *buf)
> > +{
> > +	struct mtk_vcodec_ctx *ctx = fh_to_ctx(priv);
> > +	struct vb2_queue *vq;
> > +	struct vb2_buffer *vb;
> > +	struct mtk_video_dec_buf *mtkbuf;
> > +	struct vb2_v4l2_buffer	*vb2_v4l2;
> > +
> > +	if (ctx->state == MTK_STATE_ABORT) {
> > +		mtk_v4l2_err("[%d] Call on QBUF after unrecoverable error",
> > +				ctx->id);
> > +		return -EIO;
> > +	}
> > +
> > +	vq = v4l2_m2m_get_vq(ctx->m2m_ctx, buf->type);
> > +	vb = vq->bufs[buf->index];
> > +	vb2_v4l2 = container_of(vb, struct vb2_v4l2_buffer, vb2_buf);
> > +	mtkbuf = container_of(vb2_v4l2, struct mtk_video_dec_buf, vb);
> > +
> > +	if ((buf->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) &&
> > +	    (buf->m.planes[0].bytesused == 0)) {
> > +		mtkbuf->lastframe = true;
> > +		mtk_v4l2_debug(1, "[%d] (%d) id=%d lastframe=%d (%d,%d, %d) vb=%p",
> > +			 ctx->id, buf->type, buf->index,
> > +			 mtkbuf->lastframe, buf->bytesused,
> > +			 buf->m.planes[0].bytesused, buf->length,
> > +			 vb);
> > +	}
> > +
> > +	return v4l2_m2m_qbuf(file, ctx->m2m_ctx, buf);
> > +}
> > +
> > +static int vidioc_vdec_dqbuf(struct file *file, void *priv,
> > +			     struct v4l2_buffer *buf)
> > +{
> > +	struct mtk_vcodec_ctx *ctx = fh_to_ctx(priv);
> > +
> > +	if (ctx->state == MTK_STATE_ABORT) {
> > +		mtk_v4l2_err("[%d] Call on DQBUF after unrecoverable error",
> > +				ctx->id);
> > +		return -EIO;
> > +	}
> > +
> > +	return v4l2_m2m_dqbuf(file, ctx->m2m_ctx, buf);
> > +}
> > +
> > +static int vidioc_vdec_querycap(struct file *file, void *priv,
> > +				struct v4l2_capability *cap)
> > +{
> > +	strlcpy(cap->driver, MTK_VCODEC_DEC_NAME, sizeof(cap->driver));
> > +	strlcpy(cap->bus_info, MTK_PLATFORM_STR, sizeof(cap->bus_info));
> > +	strlcpy(cap->card, MTK_PLATFORM_STR, sizeof(cap->card));
> > +
> > +	return 0;
> > +}
> > +
> > +static int vidioc_vdec_subscribe_evt(struct v4l2_fh *fh,
> > +				     const struct v4l2_event_subscription *sub)
> > +{
> > +	switch (sub->type) {
> > +	case V4L2_EVENT_EOS:
> > +		return v4l2_event_subscribe(fh, sub, 2, NULL);
> > +	case V4L2_EVENT_SOURCE_CHANGE:
> > +		return v4l2_src_change_event_subscribe(fh, sub);
> > +	default:
> > +		return v4l2_ctrl_subscribe_event(fh, sub);
> > +	}
> > +}
> > +
> > +static int vidioc_try_fmt_vid_cap_mplane(struct file *file, void *priv,
> > +				struct v4l2_format *f)
> > +{
> > +	struct mtk_video_fmt *fmt;
> > +
> > +	fmt = mtk_vdec_find_format(f);
> > +	if (!fmt) {
> > +		f->fmt.pix.pixelformat = mtk_video_formats[CAP_FMT_IDX].fourcc;
> > +		fmt = mtk_vdec_find_format(f);
> > +	}
> > +
> > +	return 0;
> > +}
> > +
> > +static int vidioc_try_fmt_vid_out_mplane(struct file *file, void *priv,
> > +				struct v4l2_format *f)
> > +{
> > +	struct v4l2_pix_format_mplane *pix_fmt_mp = &f->fmt.pix_mp;
> > +	struct mtk_video_fmt *fmt;
> > +
> > +	fmt = mtk_vdec_find_format(f);
> > +	if (!fmt) {
> > +		f->fmt.pix.pixelformat = mtk_video_formats[OUT_FMT_IDX].fourcc;
> > +		fmt = mtk_vdec_find_format(f);
> > +	}
> > +
> > +	if (pix_fmt_mp->plane_fmt[0].sizeimage == 0) {
> > +		mtk_v4l2_err("sizeimage of output format must be given");
> > +		return -EINVAL;
> > +	}
> > +
> > +	return 0;
> > +}
> > +
> > +static int vidioc_vdec_g_selection(struct file *file, void *priv,
> > +			struct v4l2_selection *s)
> > +{
> > +	struct mtk_vcodec_ctx *ctx = fh_to_ctx(priv);
> > +
> > +	if (V4L2_TYPE_IS_OUTPUT(s->type))
> > +		return -EINVAL;
> > +
> > +	if (s->target != V4L2_SEL_TGT_CROP)
> > +		return -EINVAL;
> 
> How does the cropping rectangle relate to the format size? There is no s_selection,
> so this doesn't make sense.
> 
I want to return encoded crop information or real display region that
display driver could know where is padding region.
User space use s_fmt/g_fmt  to set/get coded_width and coded_height, and
use g_crop to get real display region.
That's why I do not add s_selection.

> Alternatively, it could be that you are really returning V4L2_SEL_TGT_COMPOSE_PADDED.
> 

V4L2_SEL_TGT_COMPOSE_PADDED means
"The active area and all padding pixels that are inserted or modified by
hardware."
But I just want to return active area to user space.

> > +
> > +	if (ctx->state < MTK_STATE_HEADER)
> > +		return -EINVAL;
> > +
> > +	if ((ctx->q_data[MTK_Q_DATA_SRC].fmt->fourcc == V4L2_PIX_FMT_H264) ||
> > +	    (ctx->q_data[MTK_Q_DATA_SRC].fmt->fourcc == V4L2_PIX_FMT_VP8) ||
> > +	    (ctx->q_data[MTK_Q_DATA_SRC].fmt->fourcc == V4L2_PIX_FMT_VP9)) {
> > +
> > +		if (vdec_if_get_param(ctx, GET_PARAM_CROP_INFO, &(s->r))) {
> > +			mtk_v4l2_debug(2,
> > +					"[%d]Error!! Cannot get param : GET_PARAM_CROP_INFO ERR",
> > +					ctx->id);
> > +			s->r.left = 0;
> > +			s->r.top = 0;
> > +			s->r.width = ctx->picinfo.buf_w;
> > +			s->r.height = ctx->picinfo.buf_h;
> > +		}
> > +		mtk_v4l2_debug(2, "Cropping info: l=%d t=%d w=%d h=%d",
> > +				s->r.left, s->r.top, s->r.width,
> > +				s->r.height);
> > +	} else {
> > +		s->r.left = 0;
> > +		s->r.top = 0;
> > +		s->r.width = ctx->picinfo.pic_w;
> > +		s->r.height = ctx->picinfo.pic_h;
> > +		mtk_v4l2_debug(2, "Cropping info: w=%d h=%d fw=%d fh=%d",
> > +				s->r.width, s->r.height, ctx->picinfo.buf_w,
> > +				ctx->picinfo.buf_h);
> > +	}
> > +	return 0;
> > +}
> > +
> > +static int vidioc_vdec_s_fmt(struct file *file, void *priv,
> > +			     struct v4l2_format *f)
> > +{
> > +	struct mtk_vcodec_ctx *ctx = fh_to_ctx(priv);
> > +	struct v4l2_pix_format_mplane *pix_mp;
> > +	struct mtk_q_data *q_data;
> > +	int ret = 0;
> > +	struct mtk_video_fmt *fmt;
> > +	struct vb2_queue *vq;
> > +
> > +	mtk_v4l2_debug(3, "[%d]", ctx->id);
> > +
> > +	fmt = mtk_vdec_find_format(f);
> > +	if (fmt == NULL) {
> > +		mtk_v4l2_err("vidioc_vdec_s_fmt fail");
> > +		return ret;
> > +	}
> > +
> > +	pix_mp = &f->fmt.pix_mp;
> > +	if ((f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) &&
> > +	    vb2_is_busy(&ctx->m2m_ctx->out_q_ctx.q)) {
> > +		mtk_v4l2_err("out_q_ctx buffers already requested");
> > +		ret = -EBUSY;
> > +	}
> > +
> > +	if ((f->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) &&
> > +	    vb2_is_busy(&ctx->m2m_ctx->cap_q_ctx.q)) {
> > +		mtk_v4l2_err("cap_q_ctx buffers already requested");
> > +		ret = -EBUSY;
> > +	}
> > +
> > +	vq = v4l2_m2m_get_vq(ctx->m2m_ctx, f->type);
> > +
> > +	q_data = mtk_vdec_get_q_data(ctx, f->type);
> > +	if (!q_data)
> > +		return -EINVAL;
> > +
> > +	q_data->fmt = fmt;
> > +	if (f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) {
> > +		q_data->sizeimage[0] = pix_mp->plane_fmt[0].sizeimage;
> > +		pix_mp->plane_fmt[0].bytesperline = 0;
> > +		pix_mp->width = 0;
> > +		pix_mp->height = 0;
> > +
> > +		if (ctx->state == MTK_STATE_FREE) {
> > +			ret = vdec_if_init(ctx, q_data->fmt->fourcc);
> > +			if (ret) {
> > +				mtk_v4l2_err("[%d]: vdec_if_init() fail ret=%d",
> > +					ctx->id, ret);
> > +				return -EINVAL;
> > +			}
> > +			ctx->state = MTK_STATE_INIT;
> > +		}
> > +	}
> > +
> > +	return 0;
> > +}
> > +
> > +static int vidioc_enum_framesizes(struct file *file, void *priv,
> > +				struct v4l2_frmsizeenum *fsize)
> > +{
> > +	int i = 0;
> > +	struct mtk_vcodec_ctx *ctx = fh_to_ctx(priv);
> > +
> > +	if (fsize->index != 0)
> > +		return -EINVAL;
> > +
> > +	for (i = 0; i < NUM_SUPPORTED_FRAMESIZE; ++i) {
> > +		if (fsize->pixel_format != mtk_vdec_framesizes[i].fourcc)
> > +			continue;
> > +
> > +		fsize->type = V4L2_FRMSIZE_TYPE_STEPWISE;
> > +		fsize->stepwise = mtk_vdec_framesizes[i].stepwise;
> > +		if (!(ctx->dev->dec_capability &
> > +				VCODEC_CAPABILITY_4K_DISABLED)) {
> > +			mtk_v4l2_debug(3, "4K is enabled");
> > +			fsize->stepwise.max_width =
> > +					VCODEC_DEC_4K_CODED_WIDTH;
> > +			fsize->stepwise.max_height =
> > +					VCODEC_DEC_4K_CODED_HEIGHT;
> > +		}
> > +		mtk_v4l2_debug(1, "%x, %d %d %d %d %d %d",
> > +				ctx->dev->dec_capability,
> > +				fsize->stepwise.min_width,
> > +				fsize->stepwise.max_width,
> > +				fsize->stepwise.step_width,
> > +				fsize->stepwise.min_height,
> > +				fsize->stepwise.max_height,
> > +				fsize->stepwise.step_height);
> > +		return 0;
> > +	}
> > +
> > +	return -EINVAL;
> > +}
> > +
> > +static int vidioc_enum_fmt(struct v4l2_fmtdesc *f, bool output_queue)
> > +{
> > +	struct mtk_video_fmt *fmt;
> > +	int i, j = 0;
> > +
> > +	for (i = 0; i < NUM_FORMATS; i++) {
> > +		if (output_queue && (mtk_video_formats[i].type != MTK_FMT_DEC))
> > +			continue;
> > +		if (!output_queue &&
> > +			(mtk_video_formats[i].type != MTK_FMT_FRAME))
> > +			continue;
> > +
> > +		if (j == f->index)
> > +			break;
> > +		++j;
> > +	}
> > +
> > +	if (i == NUM_FORMATS)
> > +		return -EINVAL;
> > +
> > +	fmt = &mtk_video_formats[i];
> > +	f->pixelformat = fmt->fourcc;
> > +
> > +	return 0;
> > +}
> > +
> > +static int vidioc_vdec_enum_fmt_vid_cap_mplane(struct file *file, void *pirv,
> > +					       struct v4l2_fmtdesc *f)
> > +{
> > +	return vidioc_enum_fmt(f, false);
> > +}
> > +
> > +static int vidioc_vdec_enum_fmt_vid_out_mplane(struct file *file, void *priv,
> > +					       struct v4l2_fmtdesc *f)
> > +{
> > +	return vidioc_enum_fmt(f, true);
> > +}
> > +
> > +static int vidioc_vdec_g_fmt(struct file *file, void *priv,
> > +			     struct v4l2_format *f)
> > +{
> > +	struct mtk_vcodec_ctx *ctx = fh_to_ctx(priv);
> > +	struct v4l2_pix_format_mplane *pix_mp = &f->fmt.pix_mp;
> > +	struct vb2_queue *vq;
> > +	struct mtk_q_data *q_data;
> > +
> > +	vq = v4l2_m2m_get_vq(ctx->m2m_ctx, f->type);
> > +	if (!vq) {
> > +		mtk_v4l2_err("no vb2 queue for type=%d",
> > +			f->type);
> > +		return -EINVAL;
> > +	}
> > +
> > +	q_data = mtk_vdec_get_q_data(ctx, f->type);
> > +
> > +	if ((f->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) &&
> > +	    (ctx->state >= MTK_STATE_HEADER)) {
> > +		/* Until STREAMOFF is called on the CAPTURE queue
> > +		 * (acknowledging the event), the driver operates as if
> > +		 * the resolution hasn't changed yet.
> > +		 * So we just return picinfo yet, and update picinfo in
> > +		 * stop_streaming hook function
> > +		 */
> > +		q_data->sizeimage[0] = ctx->picinfo.y_bs_sz +
> > +					ctx->picinfo.y_len_sz;
> > +		q_data->sizeimage[1] = ctx->picinfo.c_bs_sz +
> > +					ctx->picinfo.c_len_sz;
> > +		q_data->bytesperline[0] = ctx->last_decoded_picinfo.buf_w;
> > +		q_data->bytesperline[1] = ctx->last_decoded_picinfo.buf_w;
> > +		q_data->coded_width = ctx->picinfo.buf_w;
> > +		q_data->coded_height = ctx->picinfo.buf_h;
> > +
> > +		/*
> > +		 * Width and height are set to the dimensions
> > +		 * of the movie, the buffer is bigger and
> > +		 * further processing stages should crop to this
> > +		 * rectangle.
> > +		 */
> > +		pix_mp->width = q_data->coded_width;
> > +		pix_mp->height = q_data->coded_height;
> > +		pix_mp->field = V4L2_FIELD_NONE;
> > +
> > +		/*
> > +		 * Set pixelformat to the format in which mt vcodec
> > +		 * outputs the decoded frame
> > +		 */
> > +		pix_mp->num_planes = q_data->fmt->num_planes;
> > +		pix_mp->pixelformat = q_data->fmt->fourcc;
> > +		pix_mp->plane_fmt[0].bytesperline = q_data->bytesperline[0];
> > +		pix_mp->plane_fmt[0].sizeimage = q_data->sizeimage[0];
> > +		pix_mp->plane_fmt[1].bytesperline = q_data->bytesperline[1];
> > +		pix_mp->plane_fmt[1].sizeimage = q_data->sizeimage[1];
> > +
> > +	} else if (f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) {
> > +		/*
> > +		 * This is run on OUTPUT
> > +		 * The buffer contains compressed image
> > +		 * so width and height have no meaning.
> > +		 * Assign value here to pass v4l2-compliance test
> > +		 */
> > +		pix_mp->width = q_data->visible_width;
> > +		pix_mp->height = q_data->visible_height;
> > +		pix_mp->field = V4L2_FIELD_NONE;
> > +		pix_mp->plane_fmt[0].bytesperline = q_data->bytesperline[0];
> > +		pix_mp->plane_fmt[0].sizeimage = q_data->sizeimage[0];
> > +		pix_mp->pixelformat = q_data->fmt->fourcc;
> > +		pix_mp->num_planes = q_data->fmt->num_planes;
> > +	} else {
> > +		pix_mp->width = q_data->coded_width;
> > +		pix_mp->height = q_data->coded_height;
> > +		pix_mp->field = V4L2_FIELD_NONE;
> > +		pix_mp->num_planes = q_data->fmt->num_planes;
> > +		pix_mp->pixelformat = q_data->fmt->fourcc;
> > +		pix_mp->plane_fmt[0].bytesperline = q_data->bytesperline[0];
> > +		pix_mp->plane_fmt[0].sizeimage = q_data->sizeimage[0];
> > +		pix_mp->plane_fmt[1].bytesperline = q_data->bytesperline[1];
> > +		pix_mp->plane_fmt[1].sizeimage = q_data->sizeimage[1];
> > +
> > +		mtk_v4l2_debug(1, "[%d] state=%d Format could not be read %d, not ready yet!",
> > +				ctx->id, ctx->state, f->type);
> > +		return -EINVAL;
> > +	}
> > +
> > +	return 0;
> > +}
> > +
> > +static int vb2ops_vdec_queue_setup(struct vb2_queue *vq,
> > +				unsigned int *nbuffers,
> > +				unsigned int *nplanes,
> > +				unsigned int sizes[], void *alloc_ctxs[])
> > +{
> > +	struct mtk_vcodec_ctx *ctx = vb2_get_drv_priv(vq);
> > +	struct mtk_q_data *q_data;
> > +	unsigned int i;
> > +
> > +	q_data = mtk_vdec_get_q_data(ctx, vq->type);
> > +
> > +	if (q_data == NULL) {
> > +		mtk_v4l2_err("vq->type=%d err\n", vq->type);
> > +		return -EINVAL;
> > +	}
> > +
> > +	if (*nplanes) {
> > +		for (i = 0; i < *nplanes; i++) {
> > +			if (sizes[i] < q_data->sizeimage[i])
> > +				return -EINVAL;
> > +			alloc_ctxs[i] = ctx->dev->alloc_ctx;
> > +		}
> > +	} else {
> > +
> > +		if (vq->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) {
> > +			if (ctx->state < MTK_STATE_HEADER) {
> > +				mtk_v4l2_err("State not ready");
> > +				return -EINVAL;
> > +			}
> > +			/*
> > +			 * Output plane count is 2 - one for Y and one for CbCr
> > +			 */
> > +			*nplanes = 2;
> > +		} else {
> > +			*nplanes = 1;
> > +		}
> > +
> > +		for (i = 0; i < *nplanes; i++) {
> > +			sizes[i] = q_data->sizeimage[i];
> > +			alloc_ctxs[i] = ctx->dev->alloc_ctx;
> > +		}
> > +	}
> > +
> > +	mtk_v4l2_debug(1,
> > +			"[%d]\t type = %d, get %d plane(s), %d buffer(s) of size 0x%x 0x%x ",
> > +			ctx->id, vq->type, *nplanes, *nbuffers,
> > +			sizes[0], sizes[1]);
> > +
> > +	return 0;
> > +}
> > +
> > +static int vb2ops_vdec_buf_prepare(struct vb2_buffer *vb)
> > +{
> > +	struct mtk_vcodec_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
> > +	struct mtk_q_data *q_data;
> > +	int i;
> > +
> > +	mtk_v4l2_debug(3, "[%d] (%d) id=%d",
> > +			ctx->id, vb->vb2_queue->type, vb->index);
> > +
> > +	q_data = mtk_vdec_get_q_data(ctx, vb->vb2_queue->type);
> > +
> > +	for (i = 0; i < q_data->fmt->num_planes; i++) {
> > +		if (vb2_plane_size(vb, i) > q_data->sizeimage[i]) {
> 
> Shouldn't this be < instead of > ?
> 
Yes, will fix this in next version.

> > +			mtk_v4l2_err("data will not fit into plane %d (%lu < %d)",
> > +				i, vb2_plane_size(vb, i),
> > +				q_data->sizeimage[i]);
> > +		}
> > +	}
> > +
> > +	return 0;
> > +}
> > +
> > +static void vb2ops_vdec_buf_queue(struct vb2_buffer *vb)
> > +{
> > +	struct mtk_vcodec_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
> > +	struct vb2_v4l2_buffer *vb2_v4l2 = container_of(vb,
> > +				struct vb2_v4l2_buffer, vb2_buf);
> > +	struct mtk_video_dec_buf *buf = container_of(vb2_v4l2,
> > +				struct mtk_video_dec_buf, vb);
> > +
> > +	mtk_v4l2_debug(3, "[%d] (%d) id=%d, vb=%p",
> > +			ctx->id, vb->vb2_queue->type,
> > +			vb->index, vb);
> > +	/*
> > +	 * check if this buffer is ready to be used after decode
> > +	 */
> > +	if (vb->vb2_queue->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) {
> 
> Do the 'else' part first and return there.
> 
> Then this can be shifted one TAB to the left.
> 
Will fix this in next version.

> > +		struct vb2_buffer *src_buf;
> > +		struct mtk_vcodec_mem src_mem;
> > +		bool res_chg = false;
> > +		int ret = 0;
> > +		unsigned int dpbsize = 1;
> > +
> > +		v4l2_m2m_buf_queue(ctx->m2m_ctx, vb2_v4l2);
> > +
> > +		if (ctx->state == MTK_STATE_INIT) {
> 
> Ditto.
> 
Will fix this in next version.

> > +			src_buf = v4l2_m2m_next_src_buf(ctx->m2m_ctx);
> > +			if (!src_buf) {
> > +				mtk_v4l2_err("No src buffer");
> > +				return;
> > +			}
> > +
> > +			src_mem.va	= vb2_plane_vaddr(src_buf, 0);
> > +			src_mem.dma_addr = vb2_dma_contig_plane_dma_addr(
> > +						src_buf,
> > +						0);
> > +			src_mem.size = (size_t)src_buf->planes[0].bytesused;
> > +			mtk_v4l2_debug(2,
> > +					"[%d] buf id=%d va=%p dma=%llx size=%zu",
> > +					ctx->id, src_buf->index,
> > +					src_mem.va, (u64)src_mem.dma_addr,
> > +					src_mem.size);
> > +
> > +			ret = vdec_if_decode(ctx, &src_mem, NULL, &res_chg);
> > +			if (ret) {
> > +				/* fb == NULL menas to parse SPS/PPS header or
> > +				 * resolution info in src_mem. Decode can fail
> > +				 * if there is no SPS header or picture info
> > +				 * in bs
> > +				 */
> > +				src_buf = v4l2_m2m_src_buf_remove(ctx->m2m_ctx);
> > +				v4l2_m2m_buf_done(to_vb2_v4l2_buffer(src_buf),
> > +						VB2_BUF_STATE_DONE);
> > +				mtk_v4l2_debug(0, "[%d] vdec_if_decode() src_buf=%d, size=%zu, fail=%d",
> > +						ctx->id, src_buf->index,
> > +						src_mem.size, ret);
> > +				return;
> > +			}
> > +
> > +			if (vdec_if_get_param(ctx,
> > +						GET_PARAM_PIC_INFO,
> > +						&ctx->picinfo)) {
> > +				mtk_v4l2_err("[%d]Error!! Cannot get param : GET_PARAM_PICTURE_INFO ERR",
> > +						ctx->id);
> > +				return;
> > +			}
> > +
> > +			ctx->last_decoded_picinfo = ctx->picinfo;
> > +			ctx->q_data[MTK_Q_DATA_DST].sizeimage[0] =
> > +						ctx->picinfo.y_bs_sz +
> > +						ctx->picinfo.y_len_sz;
> > +			ctx->q_data[MTK_Q_DATA_DST].bytesperline[0] =
> > +						ctx->picinfo.buf_w;
> > +			ctx->q_data[MTK_Q_DATA_DST].sizeimage[1] =
> > +						ctx->picinfo.c_bs_sz +
> > +						ctx->picinfo.c_len_sz;
> > +			ctx->q_data[MTK_Q_DATA_DST].bytesperline[1] =
> > +						ctx->picinfo.buf_w;
> > +			mtk_v4l2_debug(2, "[%d] vdec_if_init() OK wxh=%dx%d pic wxh=%dx%d sz[0]=0x%x sz[1]=0x%x",
> > +				ctx->id,
> > +				ctx->picinfo.buf_w, ctx->picinfo.buf_h,
> > +				ctx->picinfo.pic_w, ctx->picinfo.pic_h,
> > +				ctx->q_data[MTK_Q_DATA_DST].sizeimage[0],
> > +				ctx->q_data[MTK_Q_DATA_DST].sizeimage[1]);
> > +
> > +			ret = vdec_if_get_param(ctx, GET_PARAM_DPB_SIZE,
> > +						&dpbsize);
> > +			if (dpbsize == 0) {
> > +				mtk_v4l2_err("[%d] vdec_if_get_param()  GET_PARAM_DPB_SIZE fail=%d",
> > +						ctx->id, ret);
> > +			}
> > +			ctx->dpb_size = dpbsize;
> > +			ctx->state = MTK_STATE_HEADER;
> > +			mtk_v4l2_debug(1, "[%d] dpbsize=%d", ctx->id,
> > +					ctx->dpb_size);
> > +		} else {
> > +			mtk_v4l2_debug(3, "[%d] already init driver %d",
> > +					ctx->id, ctx->state);
> > +		}
> > +	} else {
> > +		mutex_lock(&ctx->lock);
> > +		if (buf->used == false) {
> > +			v4l2_m2m_buf_queue(ctx->m2m_ctx,
> > +					to_vb2_v4l2_buffer(vb));
> > +			buf->queued_in_vb2 = true;
> > +			buf->queued_in_v4l2 = true;
> > +			buf->ready_to_display = false;
> > +		} else {
> > +			buf->queued_in_vb2 = false;
> > +			buf->queued_in_v4l2 = true;
> > +			buf->ready_to_display = false;
> > +		}
> > +		mutex_unlock(&ctx->lock);
> > +	}
> > +}
> > +
> > +static void vb2ops_vdec_buf_finish(struct vb2_buffer *vb)
> > +{
> > +	struct mtk_vcodec_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
> > +
> > +	if (vb->vb2_queue->type ==
> > +		V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) {
> 
> Place this on one line.
> 
> Actually, just invert the condition and return. The remainder can then be shifted
> one TAB to the left.
> 
Got it, will fix this in next version.

> > +		struct vb2_v4l2_buffer *vb2_v4l2;
> > +		struct mtk_video_dec_buf *buf;
> > +
> > +		vb2_v4l2 = container_of(vb, struct vb2_v4l2_buffer, vb2_buf);
> > +		buf = container_of(vb2_v4l2, struct mtk_video_dec_buf, vb);
> > +		mutex_lock(&ctx->lock);
> > +		buf->queued_in_v4l2 = false;
> > +		buf->queued_in_vb2 = false;
> > +		mutex_unlock(&ctx->lock);
> > +	}
> > +}
> > +
> > +static int vb2ops_vdec_buf_init(struct vb2_buffer *vb)
> > +{
> > +	struct vb2_v4l2_buffer *vb2_v4l2 = container_of(vb,
> > +					struct vb2_v4l2_buffer, vb2_buf);
> > +	struct mtk_video_dec_buf *buf = container_of(vb2_v4l2,
> > +					struct mtk_video_dec_buf, vb);
> > +
> > +	if (vb->vb2_queue->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) {
> > +		buf->used = false;
> > +		buf->ready_to_display = false;
> > +		buf->queued_in_v4l2 = false;
> > +	} else {
> > +		buf->lastframe = false;
> > +	}
> > +
> > +	return 0;
> > +}
> > +
> > +static int vb2ops_vdec_start_streaming(struct vb2_queue *q, unsigned int count)
> > +{
> > +	struct mtk_vcodec_ctx *ctx = vb2_get_drv_priv(q);
> > +
> > +	if (ctx->state == MTK_STATE_FLUSH)
> > +		ctx->state = MTK_STATE_HEADER;
> > +
> > +	return 0;
> > +}
> > +
> > +static void vb2ops_vdec_stop_streaming(struct vb2_queue *q)
> > +{
> > +	struct vb2_buffer *src_buf = NULL, *dst_buf = NULL;
> > +	struct mtk_vcodec_ctx *ctx = vb2_get_drv_priv(q);
> > +
> > +	mtk_v4l2_debug(3, "[%d] (%d) state=(%x) ctx->decoded_frame_cnt=%d",
> > +			ctx->id, q->type, ctx->state, ctx->decoded_frame_cnt);
> > +
> > +	if (q->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) {
> > +		while ((src_buf = v4l2_m2m_src_buf_remove(ctx->m2m_ctx)))
> > +			v4l2_m2m_buf_done(to_vb2_v4l2_buffer(src_buf),
> > +					VB2_BUF_STATE_ERROR);
> > +
> 
> Same trick can be done here.
> 
Will fix this in next version.

> > +	} else if (q->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) {
> > +		if (ctx->state >= MTK_STATE_HEADER) {
> > +
> > +			/* Until STREAMOFF is called on the CAPTURE queue
> > +			 * (acknowledging the event), the driver operates
> > +			 * as if the resolution hasn't changed yet, i.e.
> > +			 * VIDIOC_G_FMT< etc. return previous resolution.
> > +			 * So we update picinfo here
> > +			 */
> > +			ctx->picinfo = ctx->last_decoded_picinfo;
> > +
> > +			mtk_v4l2_debug(2,
> > +				"[%d]-> new(%d,%d), old(%d,%d), real(%d,%d)",
> > +				ctx->id, ctx->last_decoded_picinfo.pic_w,
> > +				ctx->last_decoded_picinfo.pic_h,
> > +				ctx->picinfo.pic_w, ctx->picinfo.pic_h,
> > +				ctx->last_decoded_picinfo.buf_w,
> > +				ctx->last_decoded_picinfo.buf_h);
> > +
> > +			mtk_vdec_flush_decoder(ctx);
> > +		}
> > +		ctx->state = MTK_STATE_FLUSH;
> > +
> > +		while ((dst_buf = v4l2_m2m_dst_buf_remove(ctx->m2m_ctx))) {
> > +			vb2_set_plane_payload(dst_buf, 0, 0);
> > +			vb2_set_plane_payload(dst_buf, 1, 0);
> > +			v4l2_m2m_buf_done(to_vb2_v4l2_buffer(dst_buf),
> > +					VB2_BUF_STATE_ERROR);
> > +		}
> > +	}
> > +}
> > +
> > +static void m2mops_vdec_device_run(void *priv)
> > +{
> > +	struct mtk_vcodec_ctx *ctx = priv;
> > +	struct mtk_vcodec_dev *dev = ctx->dev;
> > +
> > +	queue_work(dev->decode_workqueue, &ctx->decode_work);
> > +}
> > +
> > +static int m2mops_vdec_job_ready(void *m2m_priv)
> > +{
> > +	struct mtk_vcodec_ctx *ctx = m2m_priv;
> > +
> > +	mtk_v4l2_debug(3, "[%d]", ctx->id);
> > +
> > +	if (ctx->state == MTK_STATE_ABORT)
> > +		return 0;
> > +
> > +	if ((ctx->last_decoded_picinfo.pic_w != ctx->picinfo.pic_w) ||
> > +	    (ctx->last_decoded_picinfo.pic_h != ctx->picinfo.pic_h))
> > +		return 0;
> > +
> > +	if (ctx->state != MTK_STATE_HEADER)
> > +		return 0;
> > +
> > +	return 1;
> > +}
> > +
> > +static void m2mops_vdec_job_abort(void *priv)
> > +{
> > +	struct mtk_vcodec_ctx *ctx = priv;
> > +
> > +	ctx->state = MTK_STATE_ABORT;
> > +}
> > +
> > +static int mtk_vdec_g_v_ctrl(struct v4l2_ctrl *ctrl)
> > +{
> > +	struct mtk_vcodec_ctx *ctx = ctrl_to_ctx(ctrl);
> > +	int ret = 0;
> > +
> > +	switch (ctrl->id) {
> > +	case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE:
> > +		if (ctx->state >= MTK_STATE_HEADER) {
> > +			ctrl->val = ctx->dpb_size;
> > +		} else {
> > +			mtk_v4l2_err("Seqinfo not ready");
> > +			ctrl->val = 1;
> > +			ret = -EAGAIN;
> > +		}
> > +		break;
> > +	default:
> > +		ret = -EINVAL;
> > +	}
> > +	return ret;
> > +}
> > +
> > +static const struct v4l2_ctrl_ops mtk_vcodec_dec_ctrl_ops = {
> > +	.g_volatile_ctrl = mtk_vdec_g_v_ctrl,
> > +};
> > +
> > +int mtk_vcodec_dec_ctrls_setup(struct mtk_vcodec_ctx *ctx)
> > +{
> > +	struct v4l2_ctrl *ctrl;
> > +
> > +	v4l2_ctrl_handler_init(&ctx->ctrl_hdl, 1);
> > +
> > +	ctrl = v4l2_ctrl_new_std(&ctx->ctrl_hdl,
> > +				&mtk_vcodec_dec_ctrl_ops,
> > +				V4L2_CID_MIN_BUFFERS_FOR_CAPTURE,
> > +				1, 32, 1, 1);
> > +	ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
> > +
> > +	if (ctx->ctrl_hdl.error) {
> > +		mtk_v4l2_err("Adding control failed %d",
> > +				ctx->ctrl_hdl.error);
> > +		return ctx->ctrl_hdl.error;
> > +	}
> > +
> > +	v4l2_ctrl_handler_setup(&ctx->ctrl_hdl);
> > +	return 0;
> > +}
> > +
> > +static void m2mops_vdec_lock(void *m2m_priv)
> > +{
> > +	struct mtk_vcodec_ctx *ctx = m2m_priv;
> > +
> > +	mtk_v4l2_debug(3, "[%d]", ctx->id);
> > +	mutex_lock(&ctx->dev->dev_mutex);
> > +}
> > +
> > +static void m2mops_vdec_unlock(void *m2m_priv)
> > +{
> > +	struct mtk_vcodec_ctx *ctx = m2m_priv;
> > +
> > +	mtk_v4l2_debug(3, "[%d]", ctx->id);
> > +	mutex_unlock(&ctx->dev->dev_mutex);
> > +}
> > +
> > +const struct v4l2_m2m_ops mtk_vdec_m2m_ops = {
> > +	.device_run	= m2mops_vdec_device_run,
> > +	.job_ready	= m2mops_vdec_job_ready,
> > +	.job_abort	= m2mops_vdec_job_abort,
> > +	.lock		= m2mops_vdec_lock,
> > +	.unlock		= m2mops_vdec_unlock,
> > +};
> > +
> > +static const struct vb2_ops mtk_vdec_vb2_ops = {
> > +	.queue_setup	= vb2ops_vdec_queue_setup,
> > +	.buf_prepare	= vb2ops_vdec_buf_prepare,
> > +	.buf_queue	= vb2ops_vdec_buf_queue,
> > +	.wait_prepare	= vb2_ops_wait_prepare,
> > +	.wait_finish	= vb2_ops_wait_finish,
> > +	.buf_init	= vb2ops_vdec_buf_init,
> > +	.buf_finish	= vb2ops_vdec_buf_finish,
> > +	.start_streaming	= vb2ops_vdec_start_streaming,
> > +	.stop_streaming	= vb2ops_vdec_stop_streaming,
> > +};
> > +
> > +const struct v4l2_ioctl_ops mtk_vdec_ioctl_ops = {
> > +	.vidioc_streamon	= v4l2_m2m_ioctl_streamon,
> > +	.vidioc_streamoff	= v4l2_m2m_ioctl_streamoff,
> > +	.vidioc_reqbufs		= v4l2_m2m_ioctl_reqbufs,
> > +	.vidioc_querybuf	= v4l2_m2m_ioctl_querybuf,
> > +	.vidioc_expbuf		= v4l2_m2m_ioctl_expbuf,
> > +
> > +	.vidioc_qbuf		= vidioc_vdec_qbuf,
> > +	.vidioc_dqbuf		= vidioc_vdec_dqbuf,
> > +
> > +	.vidioc_try_fmt_vid_cap_mplane	= vidioc_try_fmt_vid_cap_mplane,
> > +	.vidioc_try_fmt_vid_out_mplane	= vidioc_try_fmt_vid_out_mplane,
> > +
> > +	.vidioc_s_fmt_vid_cap_mplane	= vidioc_vdec_s_fmt,
> > +	.vidioc_s_fmt_vid_out_mplane	= vidioc_vdec_s_fmt,
> > +	.vidioc_g_fmt_vid_cap_mplane	= vidioc_vdec_g_fmt,
> > +	.vidioc_g_fmt_vid_out_mplane	= vidioc_vdec_g_fmt,
> > +
> > +	.vidioc_enum_fmt_vid_cap_mplane	= vidioc_vdec_enum_fmt_vid_cap_mplane,
> > +	.vidioc_enum_fmt_vid_out_mplane	= vidioc_vdec_enum_fmt_vid_out_mplane,
> > +	.vidioc_enum_framesizes	= vidioc_enum_framesizes,
> > +
> > +	.vidioc_querycap		= vidioc_vdec_querycap,
> > +	.vidioc_subscribe_event		= vidioc_vdec_subscribe_evt,
> > +	.vidioc_unsubscribe_event	= v4l2_event_unsubscribe,
> > +	.vidioc_g_selection             = vidioc_vdec_g_selection,
> > +};
> > +
> > +int mtk_vcodec_dec_queue_init(void *priv, struct vb2_queue *src_vq,
> > +			   struct vb2_queue *dst_vq)
> > +{
> > +	struct mtk_vcodec_ctx *ctx = priv;
> > +	int ret = 0;
> > +
> > +	mtk_v4l2_debug(3, "[%d]", ctx->id);
> > +
> > +	src_vq->type		= V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
> > +	src_vq->io_modes	= VB2_DMABUF | VB2_MMAP;
> > +	src_vq->drv_priv	= ctx;
> > +	src_vq->buf_struct_size = sizeof(struct mtk_video_dec_buf);
> > +	src_vq->ops		= &mtk_vdec_vb2_ops;
> > +	src_vq->mem_ops		= &vb2_dma_contig_memops;
> > +	src_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
> > +	src_vq->lock		= &ctx->dev->dev_mutex;
> > +
> > +	ret = vb2_queue_init(src_vq);
> > +	if (ret) {
> > +		mtk_v4l2_err("Failed to initialize videobuf2 queue(output)");
> > +		return ret;
> > +	}
> > +	dst_vq->type		= V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
> > +	dst_vq->io_modes	= VB2_DMABUF | VB2_MMAP;
> > +	dst_vq->drv_priv	= ctx;
> > +	dst_vq->buf_struct_size = sizeof(struct mtk_video_dec_buf);
> > +	dst_vq->ops		= &mtk_vdec_vb2_ops;
> > +	dst_vq->mem_ops		= &vb2_dma_contig_memops;
> > +	dst_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
> > +	dst_vq->lock		= &ctx->dev->dev_mutex;
> > +
> > +	ret = vb2_queue_init(dst_vq);
> > +	if (ret) {
> > +		vb2_queue_release(src_vq);
> > +		mtk_v4l2_err("Failed to initialize videobuf2 queue(capture)");
> > +	}
> > +
> > +	return ret;
> > +}
> > +
> > diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.h b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.h
> > new file mode 100644
> > index 0000000..595c244
> > --- /dev/null
> > +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.h
> > @@ -0,0 +1,88 @@
> > +/*
> > +* Copyright (c) 2016 MediaTek Inc.
> > +* Author: PC Chen <[e-mail]>
> > +*         Tiffany Lin <[e-mail]>
> > +*
> > +* This program is free software; you can redistribute it and/or modify
> > +* it under the terms of the GNU General Public License version 2 as
> > +* published by the Free Software Foundation.
> > +*
> > +* This program is distributed in the hope that it will be useful,
> > +* but WITHOUT ANY WARRANTY; without even the implied warranty of
> > +* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> > +* GNU General Public License for more details.
> > +*/
> > +
> > +#ifndef _MTK_VCODEC_DEC_H_
> > +#define _MTK_VCODEC_DEC_H_
> > +
> > +#include <media/videobuf2-core.h>
> > +#include <media/videobuf2-v4l2.h>
> > +
> > +#define VCODEC_CAPABILITY_4K_DISABLED	0x10
> > +#define VCODEC_DEC_4K_CODED_WIDTH	4096U
> > +#define VCODEC_DEC_4K_CODED_HEIGHT	2304U
> > +#define MTK_VDEC_MAX_W	2048U
> > +#define MTK_VDEC_MAX_H	1088U
> > +
> > +#define MTK_VDEC_IRQ_STATUS_DEC_SUCCESS        0x10000
> > +
> > +/**
> > + * struct vdec_fb  - decoder frame buffer
> > + * @base_y	: Y plane memory info
> > + * @base_c	: C plane memory info
> > + * @status      : frame buffer status (vdec_fb_status)
> > + */
> > +struct vdec_fb {
> > +	struct mtk_vcodec_mem	base_y;
> > +	struct mtk_vcodec_mem	base_c;
> > +	unsigned int	status;
> > +};
> > +
> > +/**
> > + * struct mtk_video_dec_buf - Private data related to each VB2 buffer.
> > + * @b:		VB2 buffer
> > + * @list:	link list
> > + * @used:	Capture buffer contain decoded frame data and keep in
> > + *			codec data structure
> > + * @ready_to_display:	Capture buffer not display yet
> > + * @queued_in_vb2:	Capture buffer is queue in vb2
> > + * @queued_in_v4l2:	Capture buffer is in v4l2 driver, but not in vb2
> > + *			queue yet
> > + * @lastframe:		Intput buffer is last buffer - EOS
> > + * @frame_buffer:	Decode status, and buffer information of Capture buffer
> > + *
> > + * Note : These status information help us track and debug buffer state
> > + */
> > +struct mtk_video_dec_buf {
> > +	struct vb2_v4l2_buffer	vb;
> > +	struct list_head	list;
> > +
> > +	bool	used;
> > +	bool	ready_to_display;
> > +	bool	queued_in_vb2;
> > +	bool	queued_in_v4l2;
> > +	bool	lastframe;
> > +	struct vdec_fb	frame_buffer;
> > +};
> > +
> > +extern const struct v4l2_ioctl_ops mtk_vdec_ioctl_ops;
> > +extern const struct v4l2_m2m_ops mtk_vdec_m2m_ops;
> > +
> > +
> > +/*
> > + * mtk_vdec_lock/mtk_vdec_unlock are for ctx instance to
> > + * get/release lock before/after access decoder hw.
> > + * mtk_vdec_lock get decoder hw lock and set curr_ctx
> > + * to ctx instance that get lock
> > + */
> > +void mtk_vdec_unlock(struct mtk_vcodec_ctx *ctx);
> > +void mtk_vdec_lock(struct mtk_vcodec_ctx *ctx);
> > +int mtk_vcodec_dec_queue_init(void *priv, struct vb2_queue *src_vq,
> > +			   struct vb2_queue *dst_vq);
> > +void mtk_vcodec_dec_set_default_params(struct mtk_vcodec_ctx *ctx);
> > +void mtk_vcodec_vdec_release(struct mtk_vcodec_ctx *ctx);
> > +int mtk_vcodec_dec_ctrls_setup(struct mtk_vcodec_ctx *ctx);
> > +
> > +
> > +#endif /* _MTK_VCODEC_DEC_H_ */
> > diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c
> > new file mode 100644
> > index 0000000..725d1e5
> > --- /dev/null
> > +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c
> > @@ -0,0 +1,408 @@
> > +/*
> > +* Copyright (c) 2016 MediaTek Inc.
> > +* Author: PC Chen <[e-mail]>
> > +*         Tiffany Lin <[e-mail]>
> > +*
> > +* This program is free software; you can redistribute it and/or modify
> > +* it under the terms of the GNU General Public License version 2 as
> > +* published by the Free Software Foundation.
> > +*
> > +* This program is distributed in the hope that it will be useful,
> > +* but WITHOUT ANY WARRANTY; without even the implied warranty of
> > +* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> > +* GNU General Public License for more details.
> > +*/
> > +
> > +#include <linux/slab.h>
> > +#include <linux/interrupt.h>
> > +#include <linux/irq.h>
> > +#include <linux/module.h>
> > +#include <linux/of_device.h>
> > +#include <linux/of.h>
> > +#include <media/v4l2-event.h>
> > +#include <media/v4l2-mem2mem.h>
> > +#include <media/videobuf2-dma-contig.h>
> > +
> > +#include "mtk_vcodec_drv.h"
> > +#include "mtk_vcodec_dec.h"
> > +#include "mtk_vcodec_dec_pm.h"
> > +#include "mtk_vcodec_intr.h"
> > +#include "mtk_vcodec_util.h"
> > +#include "mtk_vpu.h"
> > +
> > +#define VDEC_HW_ACTIVE	0x10
> > +#define VDEC_IRQ_CFG	0x11
> > +#define VDEC_IRQ_CLR	0x10
> > +#define VDEC_IRQ_CFG_REG	0xa4
> > +
> > +module_param(mtk_v4l2_dbg_level, int, S_IRUGO | S_IWUSR);
> > +module_param(mtk_vcodec_dbg, bool, S_IRUGO | S_IWUSR);
> > +
> > +/* Wake up context wait_queue */
> > +static void wake_up_ctx(struct mtk_vcodec_ctx *ctx)
> > +{
> > +	ctx->int_cond = 1;
> > +	wake_up_interruptible(&ctx->queue);
> > +}
> > +
> > +static irqreturn_t mtk_vcodec_dec_irq_handler(int irq, void *priv)
> > +{
> > +	struct mtk_vcodec_dev *dev = priv;
> > +	struct mtk_vcodec_ctx *ctx;
> > +	u32 cg_status = 0;
> > +	unsigned int dec_done_status = 0;
> > +	void __iomem *vdec_misc_addr = dev->reg_base[VDEC_MISC] +
> > +					VDEC_IRQ_CFG_REG;
> > +
> > +	ctx = mtk_vcodec_get_curr_ctx(dev);
> > +
> > +	/* check if HW active or not */
> > +	cg_status = readl(dev->reg_base[0]);
> > +	if ((cg_status & VDEC_HW_ACTIVE) != 0) {
> > +		mtk_v4l2_err("DEC ISR, VDEC active is not 0x0 (0x%08x)",
> > +			     cg_status);
> > +		return IRQ_HANDLED;
> > +	}
> > +
> > +	dec_done_status = readl(vdec_misc_addr);
> > +	ctx->irq_status = dec_done_status;
> > +	if ((dec_done_status & MTK_VDEC_IRQ_STATUS_DEC_SUCCESS) !=
> > +		MTK_VDEC_IRQ_STATUS_DEC_SUCCESS)
> > +		return IRQ_HANDLED;
> > +
> > +	/* clear interrupt */
> > +	writel((readl(vdec_misc_addr) | VDEC_IRQ_CFG),
> > +		dev->reg_base[VDEC_MISC] + VDEC_IRQ_CFG_REG);
> > +	writel((readl(vdec_misc_addr) & ~VDEC_IRQ_CLR),
> > +		dev->reg_base[VDEC_MISC] + VDEC_IRQ_CFG_REG);
> > +
> > +	wake_up_ctx(ctx);
> > +
> > +	mtk_v4l2_debug(3,
> > +			"mtk_vcodec_dec_irq_handler :wake up ctx %d, dec_done_status=%x",
> > +			ctx->id, dec_done_status);
> > +
> > +	return IRQ_HANDLED;
> > +}
> > +
> > +static void mtk_vcodec_dec_reset_handler(void *priv)
> > +{
> > +	struct mtk_vcodec_dev *dev = priv;
> > +	struct mtk_vcodec_ctx *ctx;
> > +
> > +	mtk_v4l2_err("Watchdog timeout!!");
> > +
> > +	mutex_lock(&dev->dev_mutex);
> > +	list_for_each_entry(ctx, &dev->ctx_list, list) {
> > +		ctx->state = MTK_STATE_ABORT;
> > +		mtk_v4l2_debug(0, "[%d] Change to state MTK_STATE_ERROR",
> > +				ctx->id);
> > +	}
> > +	mutex_unlock(&dev->dev_mutex);
> > +}
> > +
> > +static int fops_vcodec_open(struct file *file)
> > +{
> > +	struct mtk_vcodec_dev *dev = video_drvdata(file);
> > +	struct mtk_vcodec_ctx *ctx = NULL;
> > +	int ret = 0;
> > +
> > +	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
> > +	if (!ctx)
> > +		return -ENOMEM;
> > +
> > +	mutex_lock(&dev->dev_mutex);
> > +	ctx->id = dev->id_counter++;
> > +	v4l2_fh_init(&ctx->fh, video_devdata(file));
> > +	file->private_data = &ctx->fh;
> > +	v4l2_fh_add(&ctx->fh);
> > +	INIT_LIST_HEAD(&ctx->list);
> > +	ctx->dev = dev;
> > +	init_waitqueue_head(&ctx->queue);
> > +	mutex_init(&ctx->lock);
> > +
> > +	ctx->type = MTK_INST_DECODER;
> > +	ret = mtk_vcodec_dec_ctrls_setup(ctx);
> > +	if (ret) {
> > +		mtk_v4l2_err("Failed to setup mt vcodec controls");
> > +		goto err_ctrls_setup;
> > +	}
> > +	ctx->m2m_ctx = v4l2_m2m_ctx_init(dev->m2m_dev_dec, ctx,
> > +		&mtk_vcodec_dec_queue_init);
> > +	if (IS_ERR((__force void *)ctx->m2m_ctx)) {
> > +		ret = PTR_ERR((__force void *)ctx->m2m_ctx);
> > +		mtk_v4l2_err("Failed to v4l2_m2m_ctx_init() (%d)",
> > +			ret);
> > +		goto err_m2m_ctx_init;
> > +	}
> > +	mtk_vcodec_dec_set_default_params(ctx);
> > +
> > +	if (v4l2_fh_is_singular(&ctx->fh)) {
> > +		mtk_vcodec_dec_pw_on(&dev->pm);
> > +		/*
> > +		 * vpu_load_firmware checks if it was loaded already and
> > +		 * does nothing in that case
> > +		 */
> > +		ret = vpu_load_firmware(dev->vpu_plat_dev);
> > +		if (ret < 0) {
> > +			/*
> > +			 * Return 0 if downloading firmware successfully,
> > +			 * otherwise it is failed
> > +			 */
> > +			mtk_v4l2_err("vpu_load_firmware failed!");
> > +			goto err_load_fw;
> > +		}
> > +
> > +		dev->dec_capability =
> > +			vpu_get_vdec_hw_capa(dev->vpu_plat_dev);
> > +		mtk_v4l2_debug(0, "decoder capability %x", dev->dec_capability);
> > +	}
> > +
> > +	dev->num_instances++;
> 
> This field can be dropped since it is no longer used.
> 
Will remove this in next version.

best regards,
Tiffany

> > +	list_add(&ctx->list, &dev->ctx_list);
> > +
> > +	mutex_unlock(&dev->dev_mutex);
> > +	mtk_v4l2_debug(0, "%s decoder [%d]", dev_name(&dev->plat_dev->dev),
> > +			ctx->id);
> > +	return ret;
> > +
> > +	/* Deinit when failure occurred */
> > +err_load_fw:
> > +	v4l2_m2m_ctx_release(ctx->m2m_ctx);
> > +err_m2m_ctx_init:
> > +	v4l2_ctrl_handler_free(&ctx->ctrl_hdl);
> > +err_ctrls_setup:
> > +	v4l2_fh_del(&ctx->fh);
> > +	v4l2_fh_exit(&ctx->fh);
> > +	kfree(ctx);
> > +	mutex_unlock(&dev->dev_mutex);
> > +
> > +	return ret;
> > +}
> > +
> > +static int fops_vcodec_release(struct file *file)
> > +{
> > +	struct mtk_vcodec_dev *dev = video_drvdata(file);
> > +	struct mtk_vcodec_ctx *ctx = fh_to_ctx(file->private_data);
> > +
> > +	mtk_v4l2_debug(0, "[%d] decoder", ctx->id);
> > +	mutex_lock(&dev->dev_mutex);
> > +
> > +	mtk_vcodec_vdec_release(ctx);
> > +	if (v4l2_fh_is_singular(&ctx->fh))
> > +		mtk_vcodec_dec_pw_off(&dev->pm);
> > +
> > +	v4l2_fh_del(&ctx->fh);
> > +	v4l2_fh_exit(&ctx->fh);
> > +	v4l2_ctrl_handler_free(&ctx->ctrl_hdl);
> > +	v4l2_m2m_ctx_release(ctx->m2m_ctx);
> > +
> > +	list_del_init(&ctx->list);
> > +	dev->num_instances--;
> > +	kfree(ctx);
> > +	mutex_unlock(&dev->dev_mutex);
> > +	return 0;
> > +}
> > +
> > +static const struct v4l2_file_operations mtk_vcodec_fops = {
> > +	.owner		= THIS_MODULE,
> > +	.open		= fops_vcodec_open,
> > +	.release	= fops_vcodec_release,
> > +	.poll		= v4l2_m2m_fop_poll,
> > +	.unlocked_ioctl	= video_ioctl2,
> > +	.mmap		= v4l2_m2m_fop_mmap,
> > +};
> > +
> > +static int mtk_vcodec_probe(struct platform_device *pdev)
> > +{
> > +	struct mtk_vcodec_dev *dev;
> > +	struct video_device *vfd_dec;
> > +	struct resource *res;
> > +	int i, ret;
> > +	DEFINE_DMA_ATTRS(attrs);
> > +
> > +	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
> > +	if (!dev)
> > +		return -ENOMEM;
> > +
> > +	INIT_LIST_HEAD(&dev->ctx_list);
> > +	dev->plat_dev = pdev;
> > +
> > +	dev->vpu_plat_dev = vpu_get_plat_device(dev->plat_dev);
> > +	if (dev->vpu_plat_dev == NULL) {
> > +		mtk_v4l2_err("[VPU] vpu device in not ready");
> > +		return -EPROBE_DEFER;
> > +	}
> > +
> > +	vpu_wdt_reg_handler(dev->vpu_plat_dev, mtk_vcodec_dec_reset_handler,
> > +			dev, VPU_RST_DEC);
> > +
> > +	ret = mtk_vcodec_init_dec_pm(dev);
> > +	if (ret < 0) {
> > +		dev_err(&pdev->dev, "Failed to get mt vcodec clock source");
> > +		return ret;
> > +	}
> > +
> > +	for (i = 0; i < NUM_MAX_VDEC_REG_BASE; i++) {
> > +		res = platform_get_resource(pdev, IORESOURCE_MEM, i);
> > +		if (res == NULL) {
> > +			dev_err(&pdev->dev, "get memory resource failed.");
> > +			ret = -ENXIO;
> > +			goto err_res;
> > +		}
> > +		dev->reg_base[i] = devm_ioremap_resource(&pdev->dev, res);
> > +		if (IS_ERR((__force void *)dev->reg_base[i])) {
> > +			dev_err(&pdev->dev,
> > +				"devm_ioremap_resource %d failed.", i);
> > +			ret = PTR_ERR((__force void *)dev->reg_base);
> > +			goto err_res;
> > +		}
> > +		mtk_v4l2_debug(2, "reg[%d] base=%p", i, dev->reg_base[i]);
> > +	}
> > +
> > +	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
> > +	if (res == NULL) {
> > +		dev_err(&pdev->dev, "failed to get irq resource");
> > +		ret = -ENOENT;
> > +		goto err_res;
> > +	}
> > +
> > +	dev->dec_irq = platform_get_irq(pdev, 0);
> > +	ret = devm_request_irq(&pdev->dev, dev->dec_irq,
> > +			mtk_vcodec_dec_irq_handler, 0, pdev->name, dev);
> > +	if (ret) {
> > +		dev_err(&pdev->dev, "Failed to install dev->dec_irq %d (%d)",
> > +			dev->dec_irq,
> > +			ret);
> > +		goto err_res;
> > +	}
> > +
> > +	disable_irq(dev->dec_irq);
> > +	mutex_init(&dev->dec_mutex);
> > +	mutex_init(&dev->dev_mutex);
> > +	spin_lock_init(&dev->irqlock);
> > +
> > +	snprintf(dev->v4l2_dev.name, sizeof(dev->v4l2_dev.name), "%s",
> > +		"[/MTK_V4L2_VDEC]");
> > +
> > +	ret = v4l2_device_register(&pdev->dev, &dev->v4l2_dev);
> > +	if (ret) {
> > +		mtk_v4l2_err("v4l2_device_register err=%d", ret);
> > +		goto err_res;
> > +	}
> > +
> > +	init_waitqueue_head(&dev->queue);
> > +
> > +	vfd_dec = video_device_alloc();
> > +	if (!vfd_dec) {
> > +		mtk_v4l2_err("Failed to allocate video device");
> > +		ret = -ENOMEM;
> > +		goto err_dec_alloc;
> > +	}
> > +	vfd_dec->fops		= &mtk_vcodec_fops;
> > +	vfd_dec->ioctl_ops	= &mtk_vdec_ioctl_ops;
> > +	vfd_dec->release	= video_device_release;
> > +	vfd_dec->lock		= &dev->dev_mutex;
> > +	vfd_dec->v4l2_dev	= &dev->v4l2_dev;
> > +	vfd_dec->vfl_dir	= VFL_DIR_M2M;
> > +	vfd_dec->device_caps	= V4L2_CAP_VIDEO_M2M_MPLANE |
> > +			V4L2_CAP_STREAMING;
> > +
> > +	snprintf(vfd_dec->name, sizeof(vfd_dec->name), "%s",
> > +		MTK_VCODEC_DEC_NAME);
> > +	video_set_drvdata(vfd_dec, dev);
> > +	dev->vfd_dec = vfd_dec;
> > +	platform_set_drvdata(pdev, dev);
> > +
> > +	dev->alloc_ctx = vb2_dma_contig_init_ctx(&pdev->dev);
> > +	if (IS_ERR((__force void *)dev->alloc_ctx)) {
> > +		mtk_v4l2_err("Failed to alloc vb2 dma context 0");
> > +		ret = PTR_ERR((__force void *)dev->alloc_ctx);
> > +		goto err_vb2_ctx_init;
> > +	}
> > +
> > +	dev->m2m_dev_dec = v4l2_m2m_init(&mtk_vdec_m2m_ops);
> > +	if (IS_ERR((__force void *)dev->m2m_dev_dec)) {
> > +		mtk_v4l2_err("Failed to init mem2mem dec device");
> > +		ret = PTR_ERR((__force void *)dev->m2m_dev_dec);
> > +		goto err_dec_mem_init;
> > +	}
> > +
> > +	dev->decode_workqueue =
> > +		alloc_ordered_workqueue(MTK_VCODEC_DEC_NAME,
> > +			WQ_MEM_RECLAIM | WQ_FREEZABLE);
> > +	if (!dev->decode_workqueue) {
> > +		mtk_v4l2_err("Failed to create decode workqueue");
> > +		ret = -EINVAL;
> > +		goto err_event_workq;
> > +	}
> > +
> > +	ret = video_register_device(vfd_dec, VFL_TYPE_GRABBER, 0);
> > +	if (ret) {
> > +		mtk_v4l2_err("Failed to register video device");
> > +		goto err_dec_reg;
> > +	}
> > +
> > +	/* Avoid the iommu eat big hunks */
> > +	dma_set_attr(DMA_ATTR_ALLOC_SINGLE_PAGES, &attrs);
> > +
> > +	mtk_v4l2_debug(0, "decoder registered as /dev/video%d",
> > +		vfd_dec->num);
> > +
> > +	return 0;
> > +
> > +err_dec_reg:
> > +	destroy_workqueue(dev->decode_workqueue);
> > +err_event_workq:
> > +	v4l2_m2m_release(dev->m2m_dev_dec);
> > +err_dec_mem_init:
> > +	vb2_dma_contig_cleanup_ctx(dev->alloc_ctx);
> > +err_vb2_ctx_init:
> > +	video_unregister_device(vfd_dec);
> > +err_dec_alloc:
> > +	v4l2_device_unregister(&dev->v4l2_dev);
> > +err_res:
> > +	mtk_vcodec_release_dec_pm(dev);
> > +	return ret;
> > +}
> > +
> > +static const struct of_device_id mtk_vcodec_match[] = {
> > +	{.compatible = "mediatek,mt8173-vcodec-dec",},
> > +	{},
> > +};
> > +
> > +MODULE_DEVICE_TABLE(of, mtk_vcodec_match);
> > +
> > +static int mtk_vcodec_dec_remove(struct platform_device *pdev)
> > +{
> > +	struct mtk_vcodec_dev *dev = platform_get_drvdata(pdev);
> > +
> > +	flush_workqueue(dev->decode_workqueue);
> > +	destroy_workqueue(dev->decode_workqueue);
> > +	if (dev->m2m_dev_dec)
> > +		v4l2_m2m_release(dev->m2m_dev_dec);
> > +	if (dev->alloc_ctx)
> > +		vb2_dma_contig_cleanup_ctx(dev->alloc_ctx);
> > +
> > +	if (dev->vfd_dec)
> > +		video_unregister_device(dev->vfd_dec);
> > +
> > +	v4l2_device_unregister(&dev->v4l2_dev);
> > +	mtk_vcodec_release_dec_pm(dev);
> > +	return 0;
> > +}
> > +
> > +static struct platform_driver mtk_vcodec_dec_driver = {
> > +	.probe	= mtk_vcodec_probe,
> > +	.remove	= mtk_vcodec_dec_remove,
> > +	.driver	= {
> > +		.name	= MTK_VCODEC_DEC_NAME,
> > +		.owner	= THIS_MODULE,
> > +		.of_match_table = mtk_vcodec_match,
> > +	},
> > +};
> > +
> > +module_platform_driver(mtk_vcodec_dec_driver);
> > +
> > +MODULE_LICENSE("GPL v2");
> > +MODULE_DESCRIPTION("Mediatek video codec V4L2 decoder driver");
> > diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_pm.c b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_pm.c
> > new file mode 100644
> > index 0000000..364b756
> > --- /dev/null
> > +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_pm.c
> > @@ -0,0 +1,206 @@
> > +/*
> > +* Copyright (c) 2016 MediaTek Inc.
> > +* Author: Tiffany Lin <[e-mail]>
> > +*
> > +* This program is free software; you can redistribute it and/or modify
> > +* it under the terms of the GNU General Public License version 2 as
> > +* published by the Free Software Foundation.
> > +*
> > +* This program is distributed in the hope that it will be useful,
> > +* but WITHOUT ANY WARRANTY; without even the implied warranty of
> > +* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> > +* GNU General Public License for more details.
> > +*/
> > +
> > +#include <linux/clk.h>
> > +#include <linux/of_address.h>
> > +#include <linux/of_platform.h>
> > +#include <linux/pm_runtime.h>
> > +#include <soc/mediatek/smi.h>
> > +
> > +#include "mtk_vcodec_dec_pm.h"
> > +#include "mtk_vcodec_util.h"
> > +#include "mtk_vpu.h"
> > +
> > +int mtk_vcodec_init_dec_pm(struct mtk_vcodec_dev *mtkdev)
> > +{
> > +	struct device_node *node;
> > +	struct platform_device *pdev;
> > +	struct device *dev;
> > +	struct mtk_vcodec_pm *pm;
> > +	int ret = 0;
> > +
> > +	pdev = mtkdev->plat_dev;
> > +	pm = &mtkdev->pm;
> > +	pm->mtkdev = mtkdev;
> > +	dev = &pdev->dev;
> > +	node = of_parse_phandle(pdev->dev.of_node, "mediatek,larb", 0);
> > +	if (!node) {
> > +		mtk_v4l2_err("of_parse_phandle mediatek,larb fail!");
> > +		return -1;
> > +	}
> > +
> > +	pdev = of_find_device_by_node(node);
> > +	if (WARN_ON(!pdev)) {
> > +		of_node_put(node);
> > +		return -1;
> > +	}
> > +	pm->larbvdec = &pdev->dev;
> > +
> > +	pdev = mtkdev->plat_dev;
> > +	pm->dev = &pdev->dev;
> > +
> > +	pm->vcodecpll = devm_clk_get(&pdev->dev, "vcodecpll");
> > +	if (pm->vcodecpll == NULL) {
> > +		mtk_v4l2_err("devm_clk_get vcodecpll fail");
> > +		ret = -1;
> > +	}
> > +
> > +	pm->univpll_d2 = devm_clk_get(&pdev->dev, "univpll_d2");
> > +	if (pm->univpll_d2 == NULL) {
> > +		mtk_v4l2_err("devm_clk_get univpll_d2 fail");
> > +		ret = -1;
> > +	}
> > +
> > +	pm->clk_cci400_sel = devm_clk_get(&pdev->dev, "clk_cci400_sel");
> > +	if (pm->clk_cci400_sel == NULL) {
> > +		mtk_v4l2_err("devm_clk_get clk_cci400_sel fail");
> > +		ret = -1;
> > +	}
> > +
> > +	pm->vdec_sel = devm_clk_get(&pdev->dev, "vdec_sel");
> > +	if (pm->vdec_sel == NULL) {
> > +		mtk_v4l2_err("devm_clk_get vdec_sel fail");
> > +		ret = -1;
> > +	}
> > +
> > +	pm->vdecpll = devm_clk_get(&pdev->dev, "vdecpll");
> > +	if (pm->vdecpll == NULL) {
> > +		mtk_v4l2_err("devm_clk_get vdecpll fail");
> > +		ret = -1;
> > +	}
> > +
> > +	pm->vencpll = devm_clk_get(&pdev->dev, "vencpll");
> > +	if (pm->vencpll == NULL) {
> > +		mtk_v4l2_err("devm_clk_get vencpll fail");
> > +		ret = -1;
> > +	}
> > +
> > +	pm->venc_lt_sel = devm_clk_get(&pdev->dev, "venc_lt_sel");
> > +	if (pm->venc_lt_sel == NULL) {
> > +		mtk_v4l2_err("devm_clk_get venc_lt_sel fail");
> > +		ret = -1;
> > +	}
> > +
> > +	pm->vdec_bus_clk_src = devm_clk_get(&pdev->dev, "vdec_bus_clk_src");
> > +	if (pm->vdec_bus_clk_src == NULL) {
> > +		mtk_v4l2_err("devm_clk_get vdec_bus_clk_src");
> > +		ret = -1;
> > +	}
> > +
> > +	pm_runtime_enable(&pdev->dev);
> > +
> > +	return ret;
> > +}
> > +
> > +void mtk_vcodec_release_dec_pm(struct mtk_vcodec_dev *dev)
> > +{
> > +	pm_runtime_disable(dev->pm.dev);
> > +}
> > +
> > +void mtk_vcodec_dec_pw_on(struct mtk_vcodec_pm *pm)
> > +{
> > +	int ret;
> > +
> > +	ret = pm_runtime_get_sync(pm->dev);
> > +	if (ret)
> > +		mtk_v4l2_err("pm_runtime_get_sync fail %d", ret);
> > +}
> > +
> > +void mtk_vcodec_dec_pw_off(struct mtk_vcodec_pm *pm)
> > +{
> > +	int ret;
> > +
> > +	ret = pm_runtime_put_sync(pm->dev);
> > +	if (ret)
> > +		mtk_v4l2_err("pm_runtime_put_sync fail %d", ret);
> > +}
> > +
> > +void mtk_vcodec_dec_clock_on(struct mtk_vcodec_pm *pm)
> > +{
> > +	int ret;
> > +
> > +	ret = clk_set_rate(pm->vcodecpll, 1482 * 1000000);
> > +	if (ret)
> > +		mtk_v4l2_err("clk_set_rate vcodecpll fail %d", ret);
> > +
> > +	ret = clk_set_rate(pm->vencpll, 800 * 1000000);
> > +	if (ret)
> > +		mtk_v4l2_err("clk_set_rate vencpll fail %d", ret);
> > +
> > +	ret = clk_prepare_enable(pm->vcodecpll);
> > +	if (ret)
> > +		mtk_v4l2_err("clk_prepare_enable vcodecpll fail %d", ret);
> > +
> > +	ret = clk_prepare_enable(pm->vencpll);
> > +	if (ret)
> > +		mtk_v4l2_err("clk_prepare_enable vencpll fail %d", ret);
> > +
> > +	ret = clk_prepare_enable(pm->vdec_bus_clk_src);
> > +	if (ret)
> > +		mtk_v4l2_err("clk_prepare_enable vdec_bus_clk_src fail %d",
> > +				ret);
> > +
> > +	ret = clk_prepare_enable(pm->venc_lt_sel);
> > +	if (ret)
> > +		mtk_v4l2_err("clk_prepare_enable venc_lt_sel fail %d", ret);
> > +
> > +	ret = clk_set_parent(pm->venc_lt_sel, pm->vdec_bus_clk_src);
> > +	if (ret)
> > +		mtk_v4l2_err("clk_set_parent venc_lt_sel vdec_bus_clk_src fail %d",
> > +				ret);
> > +
> > +	ret = clk_prepare_enable(pm->univpll_d2);
> > +	if (ret)
> > +		mtk_v4l2_err("clk_prepare_enable univpll_d2 fail %d", ret);
> > +
> > +	ret = clk_prepare_enable(pm->clk_cci400_sel);
> > +	if (ret)
> > +		mtk_v4l2_err("clk_prepare_enable clk_cci400_sel fail %d", ret);
> > +
> > +	ret = clk_set_parent(pm->clk_cci400_sel, pm->univpll_d2);
> > +	if (ret)
> > +		mtk_v4l2_err("clk_set_parent clk_cci400_sel univpll_d2 fail %d",
> > +				ret);
> > +
> > +	ret = clk_prepare_enable(pm->vdecpll);
> > +	if (ret)
> > +		mtk_v4l2_err("clk_prepare_enable vdecpll fail %d", ret);
> > +
> > +	ret = clk_prepare_enable(pm->vdec_sel);
> > +	if (ret)
> > +		mtk_v4l2_err("clk_prepare_enable vdec_sel fail %d", ret);
> > +
> > +	ret = clk_set_parent(pm->vdec_sel, pm->vdecpll);
> > +	if (ret)
> > +		mtk_v4l2_err("clk_set_parent vdec_sel vdecpll fail %d", ret);
> > +
> > +	ret = mtk_smi_larb_get(pm->larbvdec);
> > +	if (ret)
> > +		mtk_v4l2_err("mtk_smi_larb_get larbvdec fail %d", ret);
> > +
> > +}
> > +
> > +void mtk_vcodec_dec_clock_off(struct mtk_vcodec_pm *pm)
> > +{
> > +	mtk_smi_larb_put(pm->larbvdec);
> > +	clk_disable_unprepare(pm->vdec_sel);
> > +	clk_disable_unprepare(pm->vdecpll);
> > +	clk_disable_unprepare(pm->univpll_d2);
> > +	clk_disable_unprepare(pm->clk_cci400_sel);
> > +	clk_disable_unprepare(pm->venc_lt_sel);
> > +	clk_disable_unprepare(pm->vdec_bus_clk_src);
> > +	clk_disable_unprepare(pm->vencpll);
> > +	clk_disable_unprepare(pm->vcodecpll);
> > +}
> > +
> > diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_pm.h b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_pm.h
> > new file mode 100644
> > index 0000000..b8bf56f
> > --- /dev/null
> > +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_pm.h
> > @@ -0,0 +1,28 @@
> > +/*
> > +* Copyright (c) 2016 MediaTek Inc.
> > +* Author: Tiffany Lin <[e-mail]>
> > +*
> > +* This program is free software; you can redistribute it and/or modify
> > +* it under the terms of the GNU General Public License version 2 as
> > +* published by the Free Software Foundation.
> > +*
> > +* This program is distributed in the hope that it will be useful,
> > +* but WITHOUT ANY WARRANTY; without even the implied warranty of
> > +* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> > +* GNU General Public License for more details.
> > +*/
> > +
> > +#ifndef _MTK_VCODEC_DEC_PM_H_
> > +#define _MTK_VCODEC_DEC_PM_H_
> > +
> > +#include "mtk_vcodec_drv.h"
> > +
> > +int mtk_vcodec_init_dec_pm(struct mtk_vcodec_dev *dev);
> > +void mtk_vcodec_release_dec_pm(struct mtk_vcodec_dev *dev);
> > +
> > +void mtk_vcodec_dec_pw_on(struct mtk_vcodec_pm *pm);
> > +void mtk_vcodec_dec_pw_off(struct mtk_vcodec_pm *pm);
> > +void mtk_vcodec_dec_clock_on(struct mtk_vcodec_pm *pm);
> > +void mtk_vcodec_dec_clock_off(struct mtk_vcodec_pm *pm);
> > +
> > +#endif /* _MTK_VCODEC_DEC_PM_H_ */
> > diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_drv.h b/drivers/media/platform/mtk-vcodec/mtk_vcodec_drv.h
> > index 78eee50..a11dfec 100644
> > --- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_drv.h
> > +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_drv.h
> > @@ -26,10 +26,10 @@
> >  #include "mtk_vcodec_util.h"
> >  
> >  #define MTK_VCODEC_DRV_NAME	"mtk_vcodec_drv"
> > +#define MTK_VCODEC_DEC_NAME	"mtk-vcodec-dec"
> >  #define MTK_VCODEC_ENC_NAME	"mtk-vcodec-enc"
> >  #define MTK_PLATFORM_STR	"platform:mt8173"
> >  
> > -
> >  #define MTK_VCODEC_MAX_PLANES	3
> >  #define MTK_V4L2_BENCHMARK	0
> >  #define WAIT_INTR_TIMEOUT_MS	1000
> > @@ -180,6 +180,9 @@ struct mtk_enc_params {
> >   * struct mtk_vcodec_pm - Power management data structure
> >   */
> >  struct mtk_vcodec_pm {
> > +	struct clk	*vdec_bus_clk_src;
> > +	struct clk	*vencpll;
> > +
> >  	struct clk	*vcodecpll;
> >  	struct clk	*univpll_d2;
> >  	struct clk	*clk_cci400_sel;
> > @@ -197,6 +200,32 @@ struct mtk_vcodec_pm {
> >  };
> >  
> >  /**
> > + * struct vdec_pic_info  - picture size information
> > + * @pic_w: picture width
> > + * @pic_h: picture height
> > + * @buf_w: picture buffer width (64 aligned up from pic_w)
> > + * @buf_h: picture buffer heiht (64 aligned up from pic_h)
> > + * @y_bs_sz: Y bitstream size
> > + * @c_bs_sz: CbCr bitstream size
> > + * @y_len_sz: additional size required to store decompress information for y
> > + *		plane
> > + * @c_len_sz: additional size required to store decompress information for cbcr
> > + *		plane
> > + * E.g. suppose picture size is 176x144,
> > + *      buffer size will be aligned to 176x160.
> > + */
> > +struct vdec_pic_info {
> > +	unsigned int pic_w;
> > +	unsigned int pic_h;
> > +	unsigned int buf_w;
> > +	unsigned int buf_h;
> > +	unsigned int y_bs_sz;
> > +	unsigned int c_bs_sz;
> > +	unsigned int y_len_sz;
> > +	unsigned int c_len_sz;
> > +};
> > +
> > +/**
> >   * struct mtk_vcodec_ctx - Context (instance) private data.
> >   *
> >   * @type: type of the instance - decoder or encoder
> > @@ -210,9 +239,12 @@ struct mtk_vcodec_pm {
> >   * @state: state of the context
> >   * @param_change: indicate encode parameter type
> >   * @enc_params: encoding parameters
> > - * @enc_if: hoooked encoder driver interface
> > + * @dec_if: hooked decoder driver interface
> > + * @enc_if: hooked encoder driver interface
> >   * @drv_handle: driver handle for specific decode/encode instance
> >   *
> > + * @picinfo: store picture info after header parsing
> > + * @dpb_size: store dpb count after header parsing
> >   * @int_cond: variable used by the waitqueue
> >   * @int_type: type of the last interrupt
> >   * @queue: waitqueue that can be used to wait for this context to
> > @@ -220,12 +252,16 @@ struct mtk_vcodec_pm {
> >   * @irq_status: irq status
> >   *
> >   * @ctrl_hdl: handler for v4l2 framework
> > + * @decode_work: worker for the decoding
> >   * @encode_work: worker for the encoding
> > + * @last_decoded_picinfo: pic information get from latest decode
> >   *
> >   * @colorspace: enum v4l2_colorspace; supplemental to pixelformat
> >   * @ycbcr_enc: enum v4l2_ycbcr_encoding, Y'CbCr encoding
> >   * @quantization: enum v4l2_quantization, colorspace quantization
> >   * @xfer_func: enum v4l2_xfer_func, colorspace transfer function
> > + * @lock: protect variables accessed by V4L2 threads and worker thread such as
> > + *	  mtk_video_dec_buf.
> >   */
> >  struct mtk_vcodec_ctx {
> >  	enum mtk_instance_type type;
> > @@ -240,21 +276,31 @@ struct mtk_vcodec_ctx {
> >  	enum mtk_encode_param param_change;
> >  	struct mtk_enc_params enc_params;
> >  
> > +	struct vdec_common_if *dec_if;
> >  	struct venc_common_if *enc_if;
> >  	unsigned long drv_handle;
> >  
> > +	struct vdec_pic_info picinfo;
> > +	int dpb_size;
> > +
> >  	int int_cond;
> >  	int int_type;
> >  	wait_queue_head_t queue;
> >  	unsigned int irq_status;
> >  
> >  	struct v4l2_ctrl_handler ctrl_hdl;
> > +	struct work_struct decode_work;
> >  	struct work_struct encode_work;
> > +	struct vdec_pic_info last_decoded_picinfo;
> >  
> >  	enum v4l2_colorspace colorspace;
> >  	enum v4l2_ycbcr_encoding ycbcr_enc;
> >  	enum v4l2_quantization quantization;
> >  	enum v4l2_xfer_func xfer_func;
> > +
> > +	int decoded_frame_cnt;
> > +	struct mutex lock;
> > +
> >  };
> >  
> >  /**
> > @@ -268,25 +314,48 @@ struct mtk_vcodec_ctx {
> >   * @alloc_ctx: VB2 allocator context
> >   *	       (for allocations without kernel mapping).
> >   * @ctx_list: list of struct mtk_vcodec_ctx
> > - * @irqlock: protect data access by irq handler and work thread
> > - * @curr_ctx: The context that is waiting for codec hardware
> > + * @irqlock: protect data access by irq handler and work thread -- curr_ctx
> > + * @curr_ctx: The context that is waiting for codec hardware. Protected by
> > + *		irqlock and dec_mutex or enc_mutex.
> >   *
> >   * @reg_base: Mapped address of MTK Vcodec registers.
> >   *
> > - * @id_counter: used to identify current opened instance
> > + * @id_counter:  An integer id given to the next opened instance
> >   * @num_instances: counter of active MTK Vcodec instances
> >   *
> >   * @encode_workqueue: encode work queue
> >   *
> > + * @v4l2_dev: V4L2 device to register video devices for.
> > + * @vfd_dec: Video device for decoder
> > + * @vfd_enc: Video device for encoder
> > + *
> > + * @m2m_dev_dec: m2m device for decoder
> > + * @m2m_dev_enc: m2m device for encoder
> > + * @plat_dev: platform device
> > + * @vpu_plat_dev: mtk vpu platform device
> > + * @alloc_ctx:VB2 allocator context
> > + *	      (for allocations without kernel mapping).
> > + * @ctx_list: list of struct mtk_vcodec_ctx
> > + * @irqlock: protect data access by irq handler and work thread
> > + * @curr_ctx: The context that is waiting for codec hardware
> > + * @reg_base: Mapped address of MTK Vcodec registers.
> > + *
> > + * @instance_mask: used to mark which index id are used
> > + * @num_instances: counter of active MTK Vcodec instances
> > + *
> > + * @decode_workqueue: decode work queue
> > + * @encode_workqueue: encode work queue
> >   * @int_cond: used to identify interrupt condition happen
> >   * @int_type: used to identify what kind of interrupt condition happen
> >   * @dev_mutex: video_device lock
> >   * @queue: waitqueue for waiting for completion of device commands
> >   *
> > + * @dec_irq: decoder irq resource
> >   * @enc_irq: h264 encoder irq resource
> > - * @enc_lt_irq: vp8 encoder irq resource
> > + * @enc_lt_irq: vp8 encoder lt irq resource
> >   *
> > - * @enc_mutex: encoder hardware lock.
> > + * @dec_mutex: decoder hardware lock
> > + * @enc_mutex: encoder hardware lock
> >   *
> >   * @pm: power management control
> >   * @dec_capability: used to identify decode capability, ex: 4k
> > @@ -294,8 +363,10 @@ struct mtk_vcodec_ctx {
> >   */
> >  struct mtk_vcodec_dev {
> >  	struct v4l2_device v4l2_dev;
> > +	struct video_device *vfd_dec;
> >  	struct video_device *vfd_enc;
> >  
> > +	struct v4l2_m2m_dev *m2m_dev_dec;
> >  	struct v4l2_m2m_dev *m2m_dev_enc;
> >  	struct platform_device *plat_dev;
> >  	struct platform_device *vpu_plat_dev;
> > @@ -308,6 +379,7 @@ struct mtk_vcodec_dev {
> >  	unsigned long id_counter;
> >  	int num_instances;
> >  
> > +	struct workqueue_struct *decode_workqueue;
> >  	struct workqueue_struct *encode_workqueue;
> >  
> >  	int int_cond;
> > @@ -315,9 +387,11 @@ struct mtk_vcodec_dev {
> >  	struct mutex dev_mutex;
> >  	wait_queue_head_t queue;
> >  
> > +	int dec_irq;
> >  	int enc_irq;
> >  	int enc_lt_irq;
> >  
> > +	struct mutex dec_mutex;
> >  	struct mutex enc_mutex;
> >  
> >  	struct mtk_vcodec_pm pm;
> > diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_intr.c b/drivers/media/platform/mtk-vcodec/mtk_vcodec_intr.c
> > index 52e7e5c..f0bdb19 100644
> > --- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_intr.c
> > +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_intr.c
> > @@ -30,8 +30,7 @@ int mtk_vcodec_wait_for_done_ctx(struct mtk_vcodec_ctx  *ctx, int command,
> >  	timeout_jiff = msecs_to_jiffies(timeout_ms);
> >  
> >  	ret = wait_event_interruptible_timeout(*waitqueue,
> > -				(ctx->int_cond &&
> > -				(ctx->int_type == command)),
> > +				ctx->int_cond,
> >  				timeout_jiff);
> >  
> >  	if (!ret) {
> > @@ -52,3 +51,4 @@ int mtk_vcodec_wait_for_done_ctx(struct mtk_vcodec_ctx  *ctx, int command,
> >  	return status;
> >  }
> >  EXPORT_SYMBOL(mtk_vcodec_wait_for_done_ctx);
> > +
> > diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_intr.h b/drivers/media/platform/mtk-vcodec/mtk_vcodec_intr.h
> > index 33e890f..fbb8b1e 100644
> > --- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_intr.h
> > +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_intr.h
> > @@ -16,7 +16,7 @@
> >  #define _MTK_VCODEC_INTR_H_
> >  
> >  #define MTK_INST_IRQ_RECEIVED		0x1
> > -#define MTK_INST_WORK_THREAD_ABORT_DONE	0x2
> > +
> >  
> >  struct mtk_vcodec_ctx;
> >  
> > diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_util.c b/drivers/media/platform/mtk-vcodec/mtk_vcodec_util.c
> > index 5e36513..7617305 100644
> > --- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_util.c
> > +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_util.c
> > @@ -81,14 +81,35 @@ void mtk_vcodec_mem_free(struct mtk_vcodec_ctx *data,
> >  		return;
> >  	}
> >  
> > -	dma_free_coherent(dev, size, mem->va, mem->dma_addr);
> > -	mem->va = NULL;
> > -	mem->dma_addr = 0;
> > -	mem->size = 0;
> > -
> >  	mtk_v4l2_debug(3, "[%d]  - va      = %p", ctx->id, mem->va);
> >  	mtk_v4l2_debug(3, "[%d]  - dma     = 0x%lx", ctx->id,
> >  		       (unsigned long)mem->dma_addr);
> >  	mtk_v4l2_debug(3, "[%d]    size = 0x%lx", ctx->id, size);
> > +
> > +	dma_free_coherent(dev, size, mem->va, mem->dma_addr);
> > +	mem->va = NULL;
> > +	mem->dma_addr = 0;
> > +	mem->size = 0;
> >  }
> >  EXPORT_SYMBOL(mtk_vcodec_mem_free);
> > +
> > +void mtk_vcodec_set_curr_ctx(struct mtk_vcodec_dev *dev,
> > +	struct mtk_vcodec_ctx *ctx)
> > +{
> > +	unsigned long flags;
> > +
> > +	spin_lock_irqsave(&dev->irqlock, flags);
> > +	dev->curr_ctx = ctx;
> > +	spin_unlock_irqrestore(&dev->irqlock, flags);
> > +}
> > +
> > +struct mtk_vcodec_ctx *mtk_vcodec_get_curr_ctx(struct mtk_vcodec_dev *dev)
> > +{
> > +	unsigned long flags;
> > +	struct mtk_vcodec_ctx *ctx;
> > +
> > +	spin_lock_irqsave(&dev->irqlock, flags);
> > +	ctx = dev->curr_ctx;
> > +	spin_unlock_irqrestore(&dev->irqlock, flags);
> > +	return ctx;
> > +}
> > diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_util.h b/drivers/media/platform/mtk-vcodec/mtk_vcodec_util.h
> > index d6345fc..91a0b1a 100644
> > --- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_util.h
> > +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_util.h
> > @@ -1,7 +1,7 @@
> >  /*
> >  * Copyright (c) 2016 MediaTek Inc.
> >  * Author: PC Chen <[e-mail]>
> > -*	Tiffany Lin <[e-mail]>
> > +*		Tiffany Lin <[e-mail]>
> >  *
> >  * This program is free software; you can redistribute it and/or modify
> >  * it under the terms of the GNU General Public License version 2 as
> > @@ -26,6 +26,7 @@ struct mtk_vcodec_mem {
> >  };
> >  
> >  struct mtk_vcodec_ctx;
> > +struct mtk_vcodec_dev;
> >  
> >  extern int mtk_v4l2_dbg_level;
> >  extern bool mtk_vcodec_dbg;
> > @@ -84,4 +85,8 @@ int mtk_vcodec_mem_alloc(struct mtk_vcodec_ctx *data,
> >  				struct mtk_vcodec_mem *mem);
> >  void mtk_vcodec_mem_free(struct mtk_vcodec_ctx *data,
> >  				struct mtk_vcodec_mem *mem);
> > +void mtk_vcodec_set_curr_ctx(struct mtk_vcodec_dev *dev,
> > +	struct mtk_vcodec_ctx *ctx);
> > +struct mtk_vcodec_ctx *mtk_vcodec_get_curr_ctx(struct mtk_vcodec_dev *dev);
> > +
> >  #endif /* _MTK_VCODEC_UTIL_H_ */
> > diff --git a/drivers/media/platform/mtk-vcodec/vdec_drv_base.h b/drivers/media/platform/mtk-vcodec/vdec_drv_base.h
> > new file mode 100644
> > index 0000000..7e4c1a9
> > --- /dev/null
> > +++ b/drivers/media/platform/mtk-vcodec/vdec_drv_base.h
> > @@ -0,0 +1,56 @@
> > +/*
> > + * Copyright (c) 2016 MediaTek Inc.
> > + * Author: PC Chen <[e-mail]>
> > + *
> > + * This program is free software; you can redistribute it and/or modify
> > + * it under the terms of the GNU General Public License version 2 as
> > + * published by the Free Software Foundation.
> > + *
> > + * This program is distributed in the hope that it will be useful,
> > + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> > + * GNU General Public License for more details.
> > + */
> > +
> > +#ifndef _VDEC_DRV_BASE_
> > +#define _VDEC_DRV_BASE_
> > +
> > +#include "mtk_vcodec_drv.h"
> > +
> > +#include "vdec_drv_if.h"
> > +
> > +struct vdec_common_if {
> > +	/**
> > +	 * (*init)() - initialize decode driver
> > +	 * @ctx     : [in] mtk v4l2 context
> > +	 * @h_vdec  : [out] driver handle
> > +	 */
> > +	int (*init)(struct mtk_vcodec_ctx *ctx, unsigned long *h_vdec);
> > +
> > +	/**
> > +	 * (*decode)() - trigger decode
> > +	 * @h_vdec  : [in] driver handle
> > +	 * @bs      : [in] input bitstream
> > +	 * @fb      : [in] frame buffer to store decoded frame
> > +	 * @res_chg : [out] resolution change happen
> > +	 */
> > +	int (*decode)(unsigned long h_vdec, struct mtk_vcodec_mem *bs,
> > +		      struct vdec_fb *fb, bool *res_chg);
> > +
> > +	/**
> > +	 * (*get_param)() - get driver's parameter
> > +	 * @h_vdec : [in] driver handle
> > +	 * @type   : [in] input parameter type
> > +	 * @out    : [out] buffer to store query result
> > +	 */
> > +	int (*get_param)(unsigned long h_vdec, enum vdec_get_param_type type,
> > +			 void *out);
> > +
> > +	/**
> > +	 * (*deinit)() - deinitialize driver.
> > +	 * @h_vdec : [in] driver handle to be deinit
> > +	 */
> > +	void (*deinit)(unsigned long h_vdec);
> > +};
> > +
> > +#endif
> > diff --git a/drivers/media/platform/mtk-vcodec/vdec_drv_if.c b/drivers/media/platform/mtk-vcodec/vdec_drv_if.c
> > new file mode 100644
> > index 0000000..8202b14
> > --- /dev/null
> > +++ b/drivers/media/platform/mtk-vcodec/vdec_drv_if.c
> > @@ -0,0 +1,107 @@
> > +/*
> > + * Copyright (c) 2016 MediaTek Inc.
> > + * Author: PC Chen <[e-mail]>
> > + *         Tiffany Lin <[e-mail]>
> > + *
> > + * This program is free software; you can redistribute it and/or modify
> > + * it under the terms of the GNU General Public License version 2 as
> > + * published by the Free Software Foundation.
> > + *
> > + * This program is distributed in the hope that it will be useful,
> > + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> > + * GNU General Public License for more details.
> > + */
> > +
> > +#include <linux/interrupt.h>
> > +#include <linux/kernel.h>
> > +#include <linux/slab.h>
> > +
> > +#include "vdec_drv_base.h"
> > +#include "vdec_drv_if.h"
> > +
> > +#include "mtk_vcodec_dec_pm.h"
> > +#include "mtk_vcodec_util.h"
> > +#include "mtk_vpu.h"
> > +
> > +int vdec_if_init(struct mtk_vcodec_ctx *ctx, unsigned int fourcc)
> > +{
> > +	int ret = 0;
> > +
> > +	switch (fourcc) {
> > +	case V4L2_PIX_FMT_H264:
> > +	case V4L2_PIX_FMT_VP8:
> > +	case V4L2_PIX_FMT_VP9:
> > +	default:
> > +		return -EINVAL;
> > +	}
> > +
> > +	mtk_vdec_lock(ctx);
> > +	mtk_vcodec_dec_clock_on(&ctx->dev->pm);
> > +	ret = ctx->dec_if->init(ctx, &ctx->drv_handle);
> > +	mtk_vcodec_dec_clock_off(&ctx->dev->pm);
> > +	mtk_vdec_unlock(ctx);
> > +
> > +	return ret;
> > +}
> > +
> > +int vdec_if_decode(struct mtk_vcodec_ctx *ctx, struct mtk_vcodec_mem *bs,
> > +		   struct vdec_fb *fb, bool *res_chg)
> > +{
> > +	int ret = 0;
> > +
> > +	if (bs) {
> > +		if ((bs->dma_addr & 63) != 0) {
> > +			mtk_v4l2_err("bs dma_addr should 64 byte align");
> > +			return -EINVAL;
> > +		}
> > +	}
> > +
> > +	if (fb) {
> > +		if (((fb->base_y.dma_addr & 511) != 0) ||
> > +		    ((fb->base_c.dma_addr & 511) != 0)) {
> > +			mtk_v4l2_err("frame buffer dma_addr should 512 byte align");
> > +			return -EINVAL;
> > +		}
> > +	}
> > +
> > +	mtk_vdec_lock(ctx);
> > +
> > +	mtk_vcodec_set_curr_ctx(ctx->dev, ctx);
> > +	mtk_vcodec_dec_clock_on(&ctx->dev->pm);
> > +	enable_irq(ctx->dev->dec_irq);
> > +	ret = ctx->dec_if->decode(ctx->drv_handle, bs, fb, res_chg);
> > +	disable_irq(ctx->dev->dec_irq);
> > +	mtk_vcodec_dec_clock_off(&ctx->dev->pm);
> > +	mtk_vcodec_set_curr_ctx(ctx->dev, NULL);
> > +
> > +	mtk_vdec_unlock(ctx);
> > +
> > +	return ret;
> > +}
> > +
> > +int vdec_if_get_param(struct mtk_vcodec_ctx *ctx, enum vdec_get_param_type type,
> > +		      void *out)
> > +{
> > +	int ret = 0;
> > +
> > +	mtk_vdec_lock(ctx);
> > +	ret = ctx->dec_if->get_param(ctx->drv_handle, type, out);
> > +	mtk_vdec_unlock(ctx);
> > +
> > +	return ret;
> > +}
> > +
> > +void vdec_if_deinit(struct mtk_vcodec_ctx *ctx)
> > +{
> > +	if (ctx->drv_handle == 0)
> > +		return;
> > +
> > +	mtk_vdec_lock(ctx);
> > +	mtk_vcodec_dec_clock_on(&ctx->dev->pm);
> > +	ctx->dec_if->deinit(ctx->drv_handle);
> > +	mtk_vcodec_dec_clock_off(&ctx->dev->pm);
> > +	mtk_vdec_unlock(ctx);
> > +
> > +	ctx->drv_handle = 0;
> > +}
> > diff --git a/drivers/media/platform/mtk-vcodec/vdec_drv_if.h b/drivers/media/platform/mtk-vcodec/vdec_drv_if.h
> > new file mode 100644
> > index 0000000..db6b520
> > --- /dev/null
> > +++ b/drivers/media/platform/mtk-vcodec/vdec_drv_if.h
> > @@ -0,0 +1,101 @@
> > +/*
> > + * Copyright (c) 2016 MediaTek Inc.
> > + * Author: PC Chen <[e-mail]>
> > + *		   Tiffany Lin <[e-mail]>
> > + *
> > + * This program is free software; you can redistribute it and/or modify
> > + * it under the terms of the GNU General Public License version 2 as
> > + * published by the Free Software Foundation.
> > + *
> > + * This program is distributed in the hope that it will be useful,
> > + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> > + * GNU General Public License for more details.
> > + */
> > +
> > +#ifndef _VDEC_DRV_IF_H_
> > +#define _VDEC_DRV_IF_H_
> > +
> > +#include "mtk_vcodec_drv.h"
> > +#include "mtk_vcodec_dec.h"
> > +#include "mtk_vcodec_util.h"
> > +
> > +
> > +/**
> > + * struct vdec_fb_status  - decoder frame buffer status
> > + * @FB_ST_NORMAL	: initial state
> > + * @FB_ST_DISPLAY	: frmae buffer is ready to be displayed
> > + * @FB_ST_FREE		: frame buffer is not used by decoder any more
> > + */
> > +enum vdec_fb_status {
> > +	FB_ST_NORMAL		= 0,
> > +	FB_ST_DISPLAY		= (1 << 0),
> > +	FB_ST_FREE		= (1 << 1)
> > +};
> > +
> > +/* For GET_PARAM_DISP_FRAME_BUFFER and GET_PARAM_FREE_FRAME_BUFFER,
> > + * the caller does not own the returned buffer. The buffer will not be
> > + *				released before vdec_if_deinit.
> > + * GET_PARAM_DISP_FRAME_BUFFER	: get next displayable frame buffer,
> > + *				struct vdec_fb**
> > + * GET_PARAM_FREE_FRAME_BUFFER	: get non-referenced framebuffer, vdec_fb**
> > + * GET_PARAM_PIC_INFO		: get picture info, struct vdec_pic_info*
> > + * GET_PARAM_CROP_INFO		: get crop info, struct v4l2_crop*
> > + * GET_PARAM_DPB_SIZE		: get dpb size, unsigned int*
> > + */
> > +enum vdec_get_param_type {
> > +	GET_PARAM_DISP_FRAME_BUFFER,
> > +	GET_PARAM_FREE_FRAME_BUFFER,
> > +	GET_PARAM_PIC_INFO,
> > +	GET_PARAM_CROP_INFO,
> > +	GET_PARAM_DPB_SIZE
> > +};
> > +
> > +/**
> > + * struct vdec_fb_node  - decoder frame buffer node
> > + * @list	: list to hold this node
> > + * @fb	: point to frame buffer (vdec_fb), fb could point to frame buffer and
> > + *	working buffer this is for maintain buffers in different state
> > + */
> > +struct vdec_fb_node {
> > +	struct list_head list;
> > +	struct vdec_fb *fb;
> > +};
> > +
> > +/**
> > + * vdec_if_init() - initialize decode driver
> > + * @ctx	: [in] v4l2 context
> > + * @fourcc	: [in] video format fourcc, V4L2_PIX_FMT_H264/VP8/VP9..
> > + */
> > +int vdec_if_init(struct mtk_vcodec_ctx *ctx, unsigned int fourcc);
> > +
> > +/**
> > + * vdec_if_deinit() - deinitialize decode driver
> > + * @ctx	: [in] v4l2 context
> > + *
> > + */
> > +void vdec_if_deinit(struct mtk_vcodec_ctx *ctx);
> > +
> > +/**
> > + * vdec_if_decode() - trigger decode
> > + * @ctx	: [in] v4l2 context
> > + * @bs	: [in] input bitstream
> > + * @fb	: [in] frame buffer to store decoded frame, when null menas parse
> > + *	header only
> > + * @res_chg	: [out] resolution change happens if current bs have different
> > + *	picture width/height
> > + * Note: To flush the decoder when reaching EOF, set input bitstream as NULL.
> > + */
> > +int vdec_if_decode(struct mtk_vcodec_ctx *ctx, struct mtk_vcodec_mem *bs,
> > +		   struct vdec_fb *fb, bool *res_chg);
> > +
> > +/**
> > + * vdec_if_get_param() - get driver's parameter
> > + * @ctx	: [in] v4l2 context
> > + * @type	: [in] input parameter type
> > + * @out	: [out] buffer to store query result
> > + */
> > +int vdec_if_get_param(struct mtk_vcodec_ctx *ctx, enum vdec_get_param_type type,
> > +		      void *out);
> > +
> > +#endif
> > diff --git a/drivers/media/platform/mtk-vcodec/vdec_ipi_msg.h b/drivers/media/platform/mtk-vcodec/vdec_ipi_msg.h
> > new file mode 100644
> > index 0000000..5a8a629
> > --- /dev/null
> > +++ b/drivers/media/platform/mtk-vcodec/vdec_ipi_msg.h
> > @@ -0,0 +1,103 @@
> > +/*
> > + * Copyright (c) 2016 MediaTek Inc.
> > + * Author: PC Chen <[e-mail]>
> > + *
> > + * This program is free software; you can redistribute it and/or
> > + * modify
> > + * it under the terms of the GNU General Public License version 2 as
> > + * published by the Free Software Foundation.
> > + *
> > + * This program is distributed in the hope that it will be useful,
> > + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> > + * GNU General Public License for more details.
> > + */
> > +
> > +#ifndef _VDEC_IPI_MSG_H_
> > +#define _VDEC_IPI_MSG_H_
> > +
> > +/**
> > + * enum vdec_ipi_msgid - message id between AP and VPU
> > + * @AP_IPIMSG_XXX	: AP to VPU cmd message id
> > + * @VPU_IPIMSG_XXX_ACK	: VPU ack AP cmd message id
> > + */
> > +enum vdec_ipi_msgid {
> > +	AP_IPIMSG_DEC_INIT = 0xA000,
> > +	AP_IPIMSG_DEC_START = 0xA001,
> > +	AP_IPIMSG_DEC_END = 0xA002,
> > +	AP_IPIMSG_DEC_DEINIT = 0xA003,
> > +	AP_IPIMSG_DEC_RESET = 0xA004,
> > +
> > +	VPU_IPIMSG_DEC_INIT_ACK = 0xB000,
> > +	VPU_IPIMSG_DEC_START_ACK = 0xB001,
> > +	VPU_IPIMSG_DEC_END_ACK = 0xB002,
> > +	VPU_IPIMSG_DEC_DEINIT_ACK = 0xB003,
> > +	VPU_IPIMSG_DEC_RESET_ACK = 0xB004,
> > +};
> > +
> > +/**
> > + * struct vdec_ap_ipi_cmd - generic AP to VPU ipi command format
> > + * @msg_id	: vdec_ipi_msgid
> > + * @vpu_inst_addr	: VPU decoder instance address
> > + */
> > +struct vdec_ap_ipi_cmd {
> > +	uint32_t msg_id;
> > +	uint32_t vpu_inst_addr;
> > +};
> > +
> > +/**
> > + * struct vdec_vpu_ipi_ack - generic VPU to AP ipi command format
> > + * @msg_id	: vdec_ipi_msgid
> > + * @status	: VPU exeuction result
> > + * @ap_inst_addr	: AP video decoder instance address
> > + */
> > +struct vdec_vpu_ipi_ack {
> > +	uint32_t msg_id;
> > +	int32_t status;
> > +	uint64_t ap_inst_addr;
> > +};
> > +
> > +/**
> > + * struct vdec_ap_ipi_init - for AP_IPIMSG_DEC_INIT
> > + * @msg_id	: AP_IPIMSG_DEC_INIT
> > + * @reserved	: Reserved field
> > + * @ap_inst_addr	: AP video decoder instance address
> > + */
> > +struct vdec_ap_ipi_init {
> > +	uint32_t msg_id;
> > +	uint32_t reserved;
> > +	uint64_t ap_inst_addr;
> > +};
> > +
> > +/**
> > + * struct vdec_ap_ipi_dec_start - for AP_IPIMSG_DEC_START
> > + * @msg_id	: AP_IPIMSG_DEC_START
> > + * @vpu_inst_addr	: VPU decoder instance address
> > + * @data	: Header info
> > + *	H264 decoder [0]:buf_sz [1]:nal_start
> > + *	VP8 decoder  [0]:width/height
> > + *	VP9 decoder  [0]:profile, [1][2] width/height
> > + * @reserved	: Reserved field
> > + */
> > +struct vdec_ap_ipi_dec_start {
> > +	uint32_t msg_id;
> > +	uint32_t vpu_inst_addr;
> > +	uint32_t data[3];
> > +	uint32_t reserved;
> > +};
> > +
> > +/**
> > + * struct vdec_vpu_ipi_init_ack - for VPU_IPIMSG_DEC_INIT_ACK
> > + * @msg_id	: VPU_IPIMSG_DEC_INIT_ACK
> > + * @status	: VPU exeuction result
> > + * @ap_inst_addr	: AP vcodec_vpu_inst instance address
> > + * @vpu_inst_addr	: VPU decoder instance address
> > + */
> > +struct vdec_vpu_ipi_init_ack {
> > +	uint32_t msg_id;
> > +	int32_t status;
> > +	uint64_t ap_inst_addr;
> > +	uint32_t vpu_inst_addr;
> > +};
> > +
> > +#endif
> > 
> 
> Regards,
> 
> 	Hans

Hans Verkuil Aug. 1, 2016, 10:39 a.m. UTC | #3

Hi Tiffany,

On 08/01/2016 11:38 AM, Tiffany Lin wrote:
> Hi Hans,

<snip>

>>> +static int vidioc_vdec_g_selection(struct file *file, void *priv,
>>> +			struct v4l2_selection *s)
>>> +{
>>> +	struct mtk_vcodec_ctx *ctx = fh_to_ctx(priv);
>>> +
>>> +	if (V4L2_TYPE_IS_OUTPUT(s->type))
>>> +		return -EINVAL;
>>> +
>>> +	if (s->target != V4L2_SEL_TGT_CROP)
>>> +		return -EINVAL;
>>
>> How does the cropping rectangle relate to the format size? There is no s_selection,
>> so this doesn't make sense.
>>
> I want to return encoded crop information or real display region that
> display driver could know where is padding region.

Sorry, I don't understand this.

This is a decoder, so based on the bitstream it decodes to a certain width
and height. I assume that is what you refer to as coded_width and coded_height?

If so, then what is the 'real display region' and how does it relate to the
coded width/height?

This is probably a terminology issue but I need to understand this before I
can decide what should be done here.

Regards,

	Hans

> User space use s_fmt/g_fmt  to set/get coded_width and coded_height, and
> use g_crop to get real display region.
> That's why I do not add s_selection.
> 
>> Alternatively, it could be that you are really returning V4L2_SEL_TGT_COMPOSE_PADDED.
>>
> 
> V4L2_SEL_TGT_COMPOSE_PADDED means
> "The active area and all padding pixels that are inserted or modified by
> hardware."
> But I just want to return active area to user space.
> 
>>> +
>>> +	if (ctx->state < MTK_STATE_HEADER)
>>> +		return -EINVAL;
>>> +
>>> +	if ((ctx->q_data[MTK_Q_DATA_SRC].fmt->fourcc == V4L2_PIX_FMT_H264) ||
>>> +	    (ctx->q_data[MTK_Q_DATA_SRC].fmt->fourcc == V4L2_PIX_FMT_VP8) ||
>>> +	    (ctx->q_data[MTK_Q_DATA_SRC].fmt->fourcc == V4L2_PIX_FMT_VP9)) {
>>> +
>>> +		if (vdec_if_get_param(ctx, GET_PARAM_CROP_INFO, &(s->r))) {
>>> +			mtk_v4l2_debug(2,
>>> +					"[%d]Error!! Cannot get param : GET_PARAM_CROP_INFO ERR",
>>> +					ctx->id);
>>> +			s->r.left = 0;
>>> +			s->r.top = 0;
>>> +			s->r.width = ctx->picinfo.buf_w;
>>> +			s->r.height = ctx->picinfo.buf_h;
>>> +		}
>>> +		mtk_v4l2_debug(2, "Cropping info: l=%d t=%d w=%d h=%d",
>>> +				s->r.left, s->r.top, s->r.width,
>>> +				s->r.height);
>>> +	} else {
>>> +		s->r.left = 0;
>>> +		s->r.top = 0;
>>> +		s->r.width = ctx->picinfo.pic_w;
>>> +		s->r.height = ctx->picinfo.pic_h;
>>> +		mtk_v4l2_debug(2, "Cropping info: w=%d h=%d fw=%d fh=%d",
>>> +				s->r.width, s->r.height, ctx->picinfo.buf_w,
>>> +				ctx->picinfo.buf_h);
>>> +	}
>>> +	return 0;
>>> +}

tiffany.lin Aug. 1, 2016, 11:28 a.m. UTC | #4

Hi Hans,

On Mon, 2016-08-01 at 12:39 +0200, Hans Verkuil wrote:
> Hi Tiffany,
> 
> On 08/01/2016 11:38 AM, Tiffany Lin wrote:
> > Hi Hans,
> 
> <snip>
> 
> >>> +static int vidioc_vdec_g_selection(struct file *file, void *priv,
> >>> +			struct v4l2_selection *s)
> >>> +{
> >>> +	struct mtk_vcodec_ctx *ctx = fh_to_ctx(priv);
> >>> +
> >>> +	if (V4L2_TYPE_IS_OUTPUT(s->type))
> >>> +		return -EINVAL;
> >>> +
> >>> +	if (s->target != V4L2_SEL_TGT_CROP)
> >>> +		return -EINVAL;
> >>
> >> How does the cropping rectangle relate to the format size? There is no s_selection,
> >> so this doesn't make sense.
> >>
> > I want to return encoded crop information or real display region that
> > display driver could know where is padding region.
> 
> Sorry, I don't understand this.
> 
> This is a decoder, so based on the bitstream it decodes to a certain width
> and height. I assume that is what you refer to as coded_width and coded_height?
> 
> If so, then what is the 'real display region' and how does it relate to the
> coded width/height?
> 
> This is probably a terminology issue but I need to understand this before I
> can decide what should be done here.
> 
We define coded_width and coded_height as frame buffer width and height.
Coded resolution is stream resolution in pixels aligned to codec format
and hardware requirements.
And we assign bytesperline as coded_width.

g_selection is for getting visible resolution for user space.
visible resolution - stream resolution of the visible picture, in
pixels, to be used for display purposes; must be smaller or equal to
coded resolution;
visible height - height for given visible resolution
visible width - width for given visible resolution

For my understand, g_fmt should return coded width/height in
pix_mp->width, pix_mp->height.
And bytesperline is coded with.
g_selection return visible width/height.
Is this understanding correct?


best regards,
Tiffany
> Regards,
> 
> 	Hans
> 
> > User space use s_fmt/g_fmt  to set/get coded_width and coded_height, and
> > use g_crop to get real display region.
> > That's why I do not add s_selection.
> > 
> >> Alternatively, it could be that you are really returning V4L2_SEL_TGT_COMPOSE_PADDED.
> >>
> > 
> > V4L2_SEL_TGT_COMPOSE_PADDED means
> > "The active area and all padding pixels that are inserted or modified by
> > hardware."
> > But I just want to return active area to user space.
> > 
> >>> +
> >>> +	if (ctx->state < MTK_STATE_HEADER)
> >>> +		return -EINVAL;
> >>> +
> >>> +	if ((ctx->q_data[MTK_Q_DATA_SRC].fmt->fourcc == V4L2_PIX_FMT_H264) ||
> >>> +	    (ctx->q_data[MTK_Q_DATA_SRC].fmt->fourcc == V4L2_PIX_FMT_VP8) ||
> >>> +	    (ctx->q_data[MTK_Q_DATA_SRC].fmt->fourcc == V4L2_PIX_FMT_VP9)) {
> >>> +
> >>> +		if (vdec_if_get_param(ctx, GET_PARAM_CROP_INFO, &(s->r))) {
> >>> +			mtk_v4l2_debug(2,
> >>> +					"[%d]Error!! Cannot get param : GET_PARAM_CROP_INFO ERR",
> >>> +					ctx->id);
> >>> +			s->r.left = 0;
> >>> +			s->r.top = 0;
> >>> +			s->r.width = ctx->picinfo.buf_w;
> >>> +			s->r.height = ctx->picinfo.buf_h;
> >>> +		}
> >>> +		mtk_v4l2_debug(2, "Cropping info: l=%d t=%d w=%d h=%d",
> >>> +				s->r.left, s->r.top, s->r.width,
> >>> +				s->r.height);
> >>> +	} else {
> >>> +		s->r.left = 0;
> >>> +		s->r.top = 0;
> >>> +		s->r.width = ctx->picinfo.pic_w;
> >>> +		s->r.height = ctx->picinfo.pic_h;
> >>> +		mtk_v4l2_debug(2, "Cropping info: w=%d h=%d fw=%d fh=%d",
> >>> +				s->r.width, s->r.height, ctx->picinfo.buf_w,
> >>> +				ctx->picinfo.buf_h);
> >>> +	}
> >>> +	return 0;
> >>> +}

Patch

diff --git a/drivers/media/platform/mtk-vcodec/Makefile b/drivers/media/platform/mtk-vcodec/Makefile
index dc5cb00..4c8ed2f 100644
--- a/drivers/media/platform/mtk-vcodec/Makefile
+++ b/drivers/media/platform/mtk-vcodec/Makefile
@@ -1,7 +1,13 @@ 
 
 
-obj-$(CONFIG_VIDEO_MEDIATEK_VCODEC) += mtk-vcodec-enc.o mtk-vcodec-common.o
-
+obj-$(CONFIG_VIDEO_MEDIATEK_VCODEC) += mtk-vcodec-dec.o \
+				       mtk-vcodec-enc.o \
+				       mtk-vcodec-common.o
+
+mtk-vcodec-dec-y := mtk_vcodec_dec_drv.o \
+		vdec_drv_if.o \
+		mtk_vcodec_dec.o \
+		mtk_vcodec_dec_pm.o \
 
 
 mtk-vcodec-enc-y := venc/venc_vp8_if.o \
diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.c b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.c
new file mode 100644
index 0000000..792858a
--- /dev/null
+++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.c
@@ -0,0 +1,1348 @@ 
+/*
+* Copyright (c) 2016 MediaTek Inc.
+* Author: PC Chen <[e-mail]>
+*         Tiffany Lin <[e-mail]>
+*
+* This program is free software; you can redistribute it and/or modify
+* it under the terms of the GNU General Public License version 2 as
+* published by the Free Software Foundation.
+*
+* This program is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+* GNU General Public License for more details.
+*/
+
+#include <media/v4l2-event.h>
+#include <media/v4l2-mem2mem.h>
+#include <media/videobuf2-dma-contig.h>
+
+#include "mtk_vcodec_drv.h"
+#include "mtk_vcodec_dec.h"
+#include "mtk_vcodec_intr.h"
+#include "mtk_vcodec_util.h"
+#include "vdec_drv_if.h"
+#include "mtk_vcodec_dec_pm.h"
+
+#define OUT_FMT_IDX	0
+#define CAP_FMT_IDX	3
+
+#define MTK_VDEC_MIN_W	64U
+#define MTK_VDEC_MIN_H	64U
+#define DFT_CFG_WIDTH	MTK_VDEC_MIN_W
+#define DFT_CFG_HEIGHT	MTK_VDEC_MIN_H
+
+static struct mtk_video_fmt mtk_video_formats[] = {
+	{
+		.fourcc = V4L2_PIX_FMT_H264,
+		.type = MTK_FMT_DEC,
+		.num_planes = 1,
+	},
+	{
+		.fourcc = V4L2_PIX_FMT_VP8,
+		.type = MTK_FMT_DEC,
+		.num_planes = 1,
+	},
+	{
+		.fourcc = V4L2_PIX_FMT_VP9,
+		.type = MTK_FMT_DEC,
+		.num_planes = 1,
+	},
+	{
+		.fourcc = V4L2_PIX_FMT_MT21,
+		.type = MTK_FMT_FRAME,
+		.num_planes = 2,
+	},
+};
+
+static const struct mtk_codec_framesizes mtk_vdec_framesizes[] = {
+	{
+		.fourcc	= V4L2_PIX_FMT_H264,
+		.stepwise = {  MTK_VDEC_MIN_W, MTK_VDEC_MAX_W, 16,
+				MTK_VDEC_MIN_H, MTK_VDEC_MAX_H, 16 },
+	},
+	{
+		.fourcc	= V4L2_PIX_FMT_VP8,
+		.stepwise = {  MTK_VDEC_MIN_W, MTK_VDEC_MAX_W, 16,
+				MTK_VDEC_MIN_H, MTK_VDEC_MAX_H, 16 },
+	},
+	{
+		.fourcc = V4L2_PIX_FMT_VP9,
+		.stepwise = {  MTK_VDEC_MIN_W, MTK_VDEC_MAX_W, 16,
+				MTK_VDEC_MIN_H, MTK_VDEC_MAX_H, 16 },
+	},
+};
+
+#define NUM_SUPPORTED_FRAMESIZE ARRAY_SIZE(mtk_vdec_framesizes)
+#define NUM_FORMATS ARRAY_SIZE(mtk_video_formats)
+
+static struct mtk_video_fmt *mtk_vdec_find_format(struct v4l2_format *f)
+{
+	struct mtk_video_fmt *fmt;
+	unsigned int k;
+
+	for (k = 0; k < NUM_FORMATS; k++) {
+		fmt = &mtk_video_formats[k];
+		if (fmt->fourcc == f->fmt.pix_mp.pixelformat)
+			return fmt;
+	}
+
+	return NULL;
+}
+
+static struct mtk_q_data *mtk_vdec_get_q_data(struct mtk_vcodec_ctx *ctx,
+					      enum v4l2_buf_type type)
+{
+	if (V4L2_TYPE_IS_OUTPUT(type))
+		return &ctx->q_data[MTK_Q_DATA_SRC];
+
+	return &ctx->q_data[MTK_Q_DATA_DST];
+}
+
+/* This function is try to clean all display buffer, the buffer will return in
+ * display order.
+ * Note the buffer return from codec driver may still in driver's reference
+ * list.
+ */
+static struct vb2_buffer *get_display_buffer(struct mtk_vcodec_ctx *ctx)
+{
+	struct vdec_fb *disp_frame_buffer = NULL;
+	struct mtk_video_dec_buf *dstbuf;
+
+	mtk_v4l2_debug(3, "[%d]", ctx->id);
+	if (vdec_if_get_param(ctx,
+			GET_PARAM_DISP_FRAME_BUFFER,
+			&disp_frame_buffer)) {
+		mtk_v4l2_err("[%d]Cannot get param : GET_PARAM_DISP_FRAME_BUFFER",
+			ctx->id);
+		return NULL;
+	}
+
+	if (disp_frame_buffer == NULL) {
+		mtk_v4l2_debug(3, "No display frame buffer");
+		return NULL;
+	}
+
+	dstbuf = container_of(disp_frame_buffer, struct mtk_video_dec_buf,
+				frame_buffer);
+	mutex_lock(&ctx->lock);
+	if (dstbuf->used) {
+		vb2_set_plane_payload(&dstbuf->vb.vb2_buf, 0,
+					ctx->picinfo.y_bs_sz);
+		vb2_set_plane_payload(&dstbuf->vb.vb2_buf, 1,
+					ctx->picinfo.c_bs_sz);
+
+		dstbuf->ready_to_display = true;
+
+		mtk_v4l2_debug(2,
+				"[%d]status=%x queue id=%d to done_list %d",
+				ctx->id, disp_frame_buffer->status,
+				dstbuf->vb.vb2_buf.index,
+				dstbuf->queued_in_vb2);
+
+		v4l2_m2m_buf_done(&dstbuf->vb, VB2_BUF_STATE_DONE);
+		ctx->decoded_frame_cnt++;
+	}
+	mutex_unlock(&ctx->lock);
+	return &dstbuf->vb.vb2_buf;
+}
+
+/* This function is try to clean all capture buffers that is not used as
+ * reference buffer by codec driver any more
+ * In this case, we need re-queue buffer to vb2 buffer if user space
+ * already return this buffer to v4l2 or this buffer is just the output of
+ * previous sps/pps/resolution change decode, or do nothing if user
+ * space still own this buffer
+ */
+static struct vb2_buffer *get_free_buffer(struct mtk_vcodec_ctx *ctx)
+{
+	struct mtk_video_dec_buf *dstbuf;
+	struct vdec_fb *free_frame_buffer = NULL;
+
+	if (vdec_if_get_param(ctx,
+				GET_PARAM_FREE_FRAME_BUFFER,
+				&free_frame_buffer)) {
+		mtk_v4l2_err("[%d] Error!! Cannot get param", ctx->id);
+		return NULL;
+	}
+	if (free_frame_buffer == NULL) {
+		mtk_v4l2_debug(3, " No free frame buffer");
+		return NULL;
+	}
+
+	mtk_v4l2_debug(3, "[%d] tmp_frame_addr = 0x%p",
+			ctx->id, free_frame_buffer);
+
+	dstbuf = container_of(free_frame_buffer, struct mtk_video_dec_buf,
+				frame_buffer);
+
+	mutex_lock(&ctx->lock);
+	if (dstbuf->used) {
+		if ((dstbuf->queued_in_vb2) &&
+		    (dstbuf->queued_in_v4l2) &&
+		    (free_frame_buffer->status == FB_ST_FREE)) {
+			/* After decode sps/pps or non-display buffer, we dont
+			 * need to return capture buffer to user space, but
+			 * just re-queue this capture buffer to vb2 queue.
+			 * This reduce overheads that dq/q unused capture
+			 * buffer We use queued_in_vb2 to mark this buffer
+			 * is from decode output, not q from user space.
+			 */
+			mtk_v4l2_debug(2,
+				"[%d]status=%x queue id=%d to rdy_queue %d",
+				ctx->id, free_frame_buffer->status,
+				dstbuf->vb.vb2_buf.index,
+				dstbuf->queued_in_vb2);
+			v4l2_m2m_buf_queue(ctx->m2m_ctx, &dstbuf->vb);
+		} else if ((dstbuf->queued_in_vb2 == false) &&
+			   (dstbuf->queued_in_v4l2 == true)) {
+			/* If buffer in v4l2 driver but not in vb2 queue yet,
+			 * and we get this buffer from free_list, it means
+			 * that codec driver do not use this buffer as
+			 * reference buffer anymore. We should q buffer to vb2
+			 * queue, so later work thread could get this buffer
+			 * for decode In this sate, queued_in_vb2 = false
+			 * menas this buffer is not from previous decode output
+			 */
+			mtk_v4l2_debug(2,
+					"[%d]status=%x queue id=%d to rdy_queue",
+					ctx->id, free_frame_buffer->status,
+					dstbuf->vb.vb2_buf.index);
+			v4l2_m2m_buf_queue(ctx->m2m_ctx, &dstbuf->vb);
+			dstbuf->queued_in_vb2 = true;
+		} else {
+			/* Codec driver do not need to reference this capture
+			 * buffer and this buffer is not in v4l2 driver.
+			 * Then we dont need to do any thing, just add log when
+			 * we need to debug buffer flow.
+			 * When this buffer q from user space, it could
+			 * directly q to vb2 buffer
+			 */
+			mtk_v4l2_debug(3, "[%d]status=%x err queue id=%d %d %d",
+					ctx->id, free_frame_buffer->status,
+					dstbuf->vb.vb2_buf.index,
+					dstbuf->queued_in_vb2,
+					dstbuf->queued_in_v4l2);
+		}
+		dstbuf->used = false;
+	}
+	mutex_unlock(&ctx->lock);
+	return &dstbuf->vb.vb2_buf;
+}
+
+static void clean_display_buffer(struct mtk_vcodec_ctx *ctx)
+{
+	struct vb2_buffer *framptr;
+
+	do {
+		framptr = get_display_buffer(ctx);
+	} while (framptr);
+}
+
+static void clean_free_buffer(struct mtk_vcodec_ctx *ctx)
+{
+	struct vb2_buffer *framptr;
+
+	do {
+		framptr = get_free_buffer(ctx);
+	} while (framptr);
+}
+
+static int mtk_vdec_queue_res_chg_event(struct mtk_vcodec_ctx *ctx)
+{
+	static const struct v4l2_event ev_src_ch = {
+		.type = V4L2_EVENT_SOURCE_CHANGE,
+		.u.src_change.changes =
+		V4L2_EVENT_SRC_CH_RESOLUTION,
+	};
+
+	mtk_v4l2_debug(1, "[%d]", ctx->id);
+	v4l2_event_queue_fh(&ctx->fh, &ev_src_ch);
+
+	return 0;
+}
+
+static void mtk_vdec_flush_decoder(struct mtk_vcodec_ctx *ctx)
+{
+	bool res_chg;
+	int ret = 0;
+
+	ret = vdec_if_decode(ctx, NULL, NULL, &res_chg);
+	if (ret)
+		mtk_v4l2_err("DecodeFinal failed, ret=%d", ret);
+
+	clean_display_buffer(ctx);
+	clean_free_buffer(ctx);
+}
+
+static void mtk_vdec_pic_info_update(struct mtk_vcodec_ctx *ctx)
+{
+	unsigned int dpbsize = 0;
+	int ret;
+
+	if (vdec_if_get_param(ctx,
+				GET_PARAM_PIC_INFO,
+				&ctx->last_decoded_picinfo)) {
+		mtk_v4l2_err("[%d]Error!! Cannot get param : GET_PARAM_PICTURE_INFO ERR",
+				ctx->id);
+		return;
+	}
+
+	if (ctx->last_decoded_picinfo.pic_w == 0 ||
+		ctx->last_decoded_picinfo.pic_h == 0 ||
+		ctx->last_decoded_picinfo.buf_w == 0 ||
+		ctx->last_decoded_picinfo.buf_h == 0) {
+		mtk_v4l2_err("Cannot get correct pic info");
+		return;
+	}
+
+	if ((ctx->last_decoded_picinfo.pic_w == ctx->picinfo.pic_w) ||
+	    (ctx->last_decoded_picinfo.pic_h == ctx->picinfo.pic_h))
+		return;
+
+	mtk_v4l2_debug(1,
+			"[%d]-> new(%d,%d), old(%d,%d), real(%d,%d)",
+			ctx->id, ctx->last_decoded_picinfo.pic_w,
+			ctx->last_decoded_picinfo.pic_h,
+			ctx->picinfo.pic_w, ctx->picinfo.pic_h,
+			ctx->last_decoded_picinfo.buf_w,
+			ctx->last_decoded_picinfo.buf_h);
+
+	ret = vdec_if_get_param(ctx, GET_PARAM_DPB_SIZE, &dpbsize);
+	if (dpbsize == 0)
+		mtk_v4l2_err("Incorrect dpb size, ret=%d", ret);
+
+	ctx->dpb_size = dpbsize;
+}
+
+static void mtk_vdec_worker(struct work_struct *work)
+{
+	struct mtk_vcodec_ctx *ctx = container_of(work, struct mtk_vcodec_ctx,
+				decode_work);
+	struct mtk_vcodec_dev *dev = ctx->dev;
+	struct vb2_buffer *src_buf, *dst_buf;
+	struct mtk_vcodec_mem buf;
+	struct vdec_fb *pfb;
+	bool res_chg = false;
+	int ret;
+	struct mtk_video_dec_buf *dst_buf_info, *src_buf_info;
+	struct vb2_v4l2_buffer *dst_vb2_v4l2, *src_vb2_v4l2;
+
+	src_buf = v4l2_m2m_next_src_buf(ctx->m2m_ctx);
+	if (src_buf == NULL) {
+		v4l2_m2m_job_finish(dev->m2m_dev_dec, ctx->m2m_ctx);
+		mtk_v4l2_debug(1, "[%d] src_buf empty!!", ctx->id);
+		return;
+	}
+
+	dst_buf = v4l2_m2m_next_dst_buf(ctx->m2m_ctx);
+	if (dst_buf == NULL) {
+		v4l2_m2m_job_finish(dev->m2m_dev_dec, ctx->m2m_ctx);
+		mtk_v4l2_debug(1, "[%d] dst_buf empty!!", ctx->id);
+		return;
+	}
+
+	src_vb2_v4l2 = container_of(src_buf, struct vb2_v4l2_buffer, vb2_buf);
+	src_buf_info = container_of(src_vb2_v4l2, struct mtk_video_dec_buf, vb);
+
+	dst_vb2_v4l2 = container_of(dst_buf, struct vb2_v4l2_buffer, vb2_buf);
+	dst_buf_info = container_of(dst_vb2_v4l2, struct mtk_video_dec_buf, vb);
+
+	buf.va = vb2_plane_vaddr(src_buf, 0);
+	buf.dma_addr = vb2_dma_contig_plane_dma_addr(src_buf, 0);
+	buf.size = (size_t)src_buf->planes[0].bytesused;
+	if (!buf.va) {
+		v4l2_m2m_job_finish(dev->m2m_dev_dec, ctx->m2m_ctx);
+		mtk_v4l2_err("[%d] id=%d src_addr is NULL!!",
+				ctx->id, src_buf->index);
+		return;
+	}
+
+	pfb = &dst_buf_info->frame_buffer;
+	pfb->base_y.va = vb2_plane_vaddr(dst_buf, 0);
+	pfb->base_y.dma_addr = vb2_dma_contig_plane_dma_addr(dst_buf, 0);
+	pfb->base_y.size = ctx->picinfo.y_bs_sz + ctx->picinfo.y_len_sz;
+
+	pfb->base_c.va = vb2_plane_vaddr(dst_buf, 1);
+	pfb->base_c.dma_addr = vb2_dma_contig_plane_dma_addr(dst_buf, 1);
+	pfb->base_c.size = ctx->picinfo.c_bs_sz + ctx->picinfo.c_len_sz;
+	pfb->status = 0;
+	mtk_v4l2_debug(3, "===>[%d] vdec_if_decode() ===>", ctx->id);
+	mtk_v4l2_debug(3, "[%d] Bitstream VA=%p DMA=%llx Size=0x%lx vb=%p",
+			ctx->id, buf.va, (u64)buf.dma_addr, buf.size, src_buf);
+
+	mtk_v4l2_debug(3,
+			"id=%d Framebuf  pfb=%p VA=%p Y_DMA=%llx C_DMA=%llx Size=0x%lx",
+			dst_buf->index, pfb,
+			pfb->base_y.va, (u64)pfb->base_y.dma_addr,
+			(u64)pfb->base_c.dma_addr, pfb->base_y.size);
+
+	if (src_buf_info->lastframe) {
+		/* update src buf status */
+		src_buf = v4l2_m2m_src_buf_remove(ctx->m2m_ctx);
+		src_buf_info->lastframe = false;
+		v4l2_m2m_buf_done(&src_buf_info->vb, VB2_BUF_STATE_DONE);
+
+		/* update dst buf status */
+		dst_buf = v4l2_m2m_dst_buf_remove(ctx->m2m_ctx);
+		dst_buf_info->used = false;
+
+		vdec_if_decode(ctx, NULL, NULL, &res_chg);
+		clean_display_buffer(ctx);
+		vb2_set_plane_payload(&dst_buf_info->vb.vb2_buf, 0, 0);
+		vb2_set_plane_payload(&dst_buf_info->vb.vb2_buf, 1, 0);
+		v4l2_m2m_buf_done(&dst_buf_info->vb, VB2_BUF_STATE_DONE);
+		clean_free_buffer(ctx);
+	} else {
+		dst_buf_info->vb.vb2_buf.timestamp
+				= src_buf_info->vb.vb2_buf.timestamp;
+		dst_buf_info->vb.timecode
+				= src_buf_info->vb.timecode;
+		mutex_lock(&ctx->lock);
+		dst_buf_info->used = true;
+		mutex_unlock(&ctx->lock);
+		src_buf_info->used = true;
+
+		ret = vdec_if_decode(ctx, &buf, pfb, &res_chg);
+
+		if (ret) {
+			mtk_v4l2_err(
+				" <===[%d], src_buf[%d]%d sz=0x%zx pts=%llu dst_buf[%d] vdec_if_decode() ret=%d res_chg=%d===>",
+				ctx->id,
+				src_buf->index,
+				src_buf_info->lastframe,
+				buf.size,
+				src_buf_info->vb.vb2_buf.timestamp,
+				dst_buf->index,
+				ret, res_chg);
+			src_buf = v4l2_m2m_src_buf_remove(ctx->m2m_ctx);
+			v4l2_m2m_buf_done(&src_buf_info->vb,
+					VB2_BUF_STATE_ERROR);
+		} else if (res_chg == false) {
+			/* we only return src buffer with VB2_BUF_STATE_DONE
+			  * when decode success without resolution change
+			  */
+			src_buf = v4l2_m2m_src_buf_remove(ctx->m2m_ctx);
+			v4l2_m2m_buf_done(&src_buf_info->vb,
+					VB2_BUF_STATE_DONE);
+		}
+
+		dst_buf = v4l2_m2m_dst_buf_remove(ctx->m2m_ctx);
+		clean_display_buffer(ctx);
+		clean_free_buffer(ctx);
+
+		if (!ret && res_chg) {
+			mtk_vdec_pic_info_update(ctx);
+			/*
+			 * On encountering a resolution change in the stream.
+			 * The driver must first process and decode all
+			 * remaining buffers from before the resolution change
+			 * point, so call flush decode here
+			 */
+			mtk_vdec_flush_decoder(ctx);
+			/*
+			 * After all buffers containing decoded frames from
+			 * before the resolution change point ready to be
+			 * dequeued on the CAPTURE queue, the driver sends a
+			 * V4L2_EVENT_SOURCE_CHANGE event for source change
+			 * type V4L2_EVENT_SRC_CH_RESOLUTION
+			 */
+			mtk_vdec_queue_res_chg_event(ctx);
+		}
+	}
+
+	v4l2_m2m_job_finish(dev->m2m_dev_dec, ctx->m2m_ctx);
+}
+
+void mtk_vdec_unlock(struct mtk_vcodec_ctx *ctx)
+{
+	mutex_unlock(&ctx->dev->dec_mutex);
+}
+
+void mtk_vdec_lock(struct mtk_vcodec_ctx *ctx)
+{
+	mutex_lock(&ctx->dev->dec_mutex);
+}
+
+void mtk_vcodec_vdec_release(struct mtk_vcodec_ctx *ctx)
+{
+	vdec_if_deinit(ctx);
+	ctx->state = MTK_STATE_FREE;
+}
+
+void mtk_vcodec_dec_set_default_params(struct mtk_vcodec_ctx *ctx)
+{
+	struct mtk_q_data *q_data;
+
+	ctx->m2m_ctx->q_lock = &ctx->dev->dev_mutex;
+	ctx->fh.m2m_ctx = ctx->m2m_ctx;
+	ctx->fh.ctrl_handler = &ctx->ctrl_hdl;
+	INIT_WORK(&ctx->decode_work, mtk_vdec_worker);
+	ctx->colorspace = V4L2_COLORSPACE_REC709;
+	ctx->ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT;
+	ctx->quantization = V4L2_QUANTIZATION_DEFAULT;
+	ctx->xfer_func = V4L2_XFER_FUNC_DEFAULT;
+
+	q_data = &ctx->q_data[MTK_Q_DATA_SRC];
+	memset(q_data, 0, sizeof(struct mtk_q_data));
+	q_data->visible_width = DFT_CFG_WIDTH;
+	q_data->visible_height = DFT_CFG_HEIGHT;
+	q_data->fmt = &mtk_video_formats[OUT_FMT_IDX];
+	q_data->field = V4L2_FIELD_NONE;
+
+	ctx->q_data[MTK_Q_DATA_DST].sizeimage[0] =
+		DFT_CFG_WIDTH * DFT_CFG_HEIGHT;
+	ctx->q_data[MTK_Q_DATA_DST].bytesperline[0] = 0;
+
+	q_data = &ctx->q_data[MTK_Q_DATA_DST];
+	memset(q_data, 0, sizeof(struct mtk_q_data));
+	q_data->visible_width = DFT_CFG_WIDTH;
+	q_data->visible_height = DFT_CFG_HEIGHT;
+	q_data->coded_width = DFT_CFG_WIDTH;
+	q_data->coded_height = DFT_CFG_HEIGHT;
+	q_data->fmt = &mtk_video_formats[CAP_FMT_IDX];
+	q_data->field = V4L2_FIELD_NONE;
+
+	v4l_bound_align_image(&q_data->coded_width,
+				MTK_VDEC_MIN_W,
+				MTK_VDEC_MAX_W, 4,
+				&q_data->coded_height,
+				MTK_VDEC_MIN_H,
+				MTK_VDEC_MAX_H, 5, 6);
+
+	q_data->sizeimage[0] = q_data->coded_width * q_data->coded_height;
+	q_data->bytesperline[0] = q_data->coded_width;
+	q_data->sizeimage[1] = q_data->sizeimage[0] / 2;
+	q_data->bytesperline[1] = q_data->coded_width;
+}
+
+static int vidioc_vdec_qbuf(struct file *file, void *priv,
+			    struct v4l2_buffer *buf)
+{
+	struct mtk_vcodec_ctx *ctx = fh_to_ctx(priv);
+	struct vb2_queue *vq;
+	struct vb2_buffer *vb;
+	struct mtk_video_dec_buf *mtkbuf;
+	struct vb2_v4l2_buffer	*vb2_v4l2;
+
+	if (ctx->state == MTK_STATE_ABORT) {
+		mtk_v4l2_err("[%d] Call on QBUF after unrecoverable error",
+				ctx->id);
+		return -EIO;
+	}
+
+	vq = v4l2_m2m_get_vq(ctx->m2m_ctx, buf->type);
+	vb = vq->bufs[buf->index];
+	vb2_v4l2 = container_of(vb, struct vb2_v4l2_buffer, vb2_buf);
+	mtkbuf = container_of(vb2_v4l2, struct mtk_video_dec_buf, vb);
+
+	if ((buf->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) &&
+	    (buf->m.planes[0].bytesused == 0)) {
+		mtkbuf->lastframe = true;
+		mtk_v4l2_debug(1, "[%d] (%d) id=%d lastframe=%d (%d,%d, %d) vb=%p",
+			 ctx->id, buf->type, buf->index,
+			 mtkbuf->lastframe, buf->bytesused,
+			 buf->m.planes[0].bytesused, buf->length,
+			 vb);
+	}
+
+	return v4l2_m2m_qbuf(file, ctx->m2m_ctx, buf);
+}
+
+static int vidioc_vdec_dqbuf(struct file *file, void *priv,
+			     struct v4l2_buffer *buf)
+{
+	struct mtk_vcodec_ctx *ctx = fh_to_ctx(priv);
+
+	if (ctx->state == MTK_STATE_ABORT) {
+		mtk_v4l2_err("[%d] Call on DQBUF after unrecoverable error",
+				ctx->id);
+		return -EIO;
+	}
+
+	return v4l2_m2m_dqbuf(file, ctx->m2m_ctx, buf);
+}
+
+static int vidioc_vdec_querycap(struct file *file, void *priv,
+				struct v4l2_capability *cap)
+{
+	strlcpy(cap->driver, MTK_VCODEC_DEC_NAME, sizeof(cap->driver));
+	strlcpy(cap->bus_info, MTK_PLATFORM_STR, sizeof(cap->bus_info));
+	strlcpy(cap->card, MTK_PLATFORM_STR, sizeof(cap->card));
+
+	return 0;
+}
+
+static int vidioc_vdec_subscribe_evt(struct v4l2_fh *fh,
+				     const struct v4l2_event_subscription *sub)
+{
+	switch (sub->type) {
+	case V4L2_EVENT_EOS:
+		return v4l2_event_subscribe(fh, sub, 2, NULL);
+	case V4L2_EVENT_SOURCE_CHANGE:
+		return v4l2_src_change_event_subscribe(fh, sub);
+	default:
+		return v4l2_ctrl_subscribe_event(fh, sub);
+	}
+}
+
+static int vidioc_try_fmt_vid_cap_mplane(struct file *file, void *priv,
+				struct v4l2_format *f)
+{
+	struct mtk_video_fmt *fmt;
+
+	fmt = mtk_vdec_find_format(f);
+	if (!fmt) {
+		f->fmt.pix.pixelformat = mtk_video_formats[CAP_FMT_IDX].fourcc;
+		fmt = mtk_vdec_find_format(f);
+	}
+
+	return 0;
+}
+
+static int vidioc_try_fmt_vid_out_mplane(struct file *file, void *priv,
+				struct v4l2_format *f)
+{
+	struct v4l2_pix_format_mplane *pix_fmt_mp = &f->fmt.pix_mp;
+	struct mtk_video_fmt *fmt;
+
+	fmt = mtk_vdec_find_format(f);
+	if (!fmt) {
+		f->fmt.pix.pixelformat = mtk_video_formats[OUT_FMT_IDX].fourcc;
+		fmt = mtk_vdec_find_format(f);
+	}
+
+	if (pix_fmt_mp->plane_fmt[0].sizeimage == 0) {
+		mtk_v4l2_err("sizeimage of output format must be given");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int vidioc_vdec_g_selection(struct file *file, void *priv,
+			struct v4l2_selection *s)
+{
+	struct mtk_vcodec_ctx *ctx = fh_to_ctx(priv);
+
+	if (V4L2_TYPE_IS_OUTPUT(s->type))
+		return -EINVAL;
+
+	if (s->target != V4L2_SEL_TGT_CROP)
+		return -EINVAL;
+
+	if (ctx->state < MTK_STATE_HEADER)
+		return -EINVAL;
+
+	if ((ctx->q_data[MTK_Q_DATA_SRC].fmt->fourcc == V4L2_PIX_FMT_H264) ||
+	    (ctx->q_data[MTK_Q_DATA_SRC].fmt->fourcc == V4L2_PIX_FMT_VP8) ||
+	    (ctx->q_data[MTK_Q_DATA_SRC].fmt->fourcc == V4L2_PIX_FMT_VP9)) {
+
+		if (vdec_if_get_param(ctx, GET_PARAM_CROP_INFO, &(s->r))) {
+			mtk_v4l2_debug(2,
+					"[%d]Error!! Cannot get param : GET_PARAM_CROP_INFO ERR",
+					ctx->id);
+			s->r.left = 0;
+			s->r.top = 0;
+			s->r.width = ctx->picinfo.buf_w;
+			s->r.height = ctx->picinfo.buf_h;
+		}
+		mtk_v4l2_debug(2, "Cropping info: l=%d t=%d w=%d h=%d",
+				s->r.left, s->r.top, s->r.width,
+				s->r.height);
+	} else {
+		s->r.left = 0;
+		s->r.top = 0;
+		s->r.width = ctx->picinfo.pic_w;
+		s->r.height = ctx->picinfo.pic_h;
+		mtk_v4l2_debug(2, "Cropping info: w=%d h=%d fw=%d fh=%d",
+				s->r.width, s->r.height, ctx->picinfo.buf_w,
+				ctx->picinfo.buf_h);
+	}
+	return 0;
+}
+
+static int vidioc_vdec_s_fmt(struct file *file, void *priv,
+			     struct v4l2_format *f)
+{
+	struct mtk_vcodec_ctx *ctx = fh_to_ctx(priv);
+	struct v4l2_pix_format_mplane *pix_mp;
+	struct mtk_q_data *q_data;
+	int ret = 0;
+	struct mtk_video_fmt *fmt;
+	struct vb2_queue *vq;
+
+	mtk_v4l2_debug(3, "[%d]", ctx->id);
+
+	fmt = mtk_vdec_find_format(f);
+	if (fmt == NULL) {
+		mtk_v4l2_err("vidioc_vdec_s_fmt fail");
+		return ret;
+	}
+
+	pix_mp = &f->fmt.pix_mp;
+	if ((f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) &&
+	    vb2_is_busy(&ctx->m2m_ctx->out_q_ctx.q)) {
+		mtk_v4l2_err("out_q_ctx buffers already requested");
+		ret = -EBUSY;
+	}
+
+	if ((f->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) &&
+	    vb2_is_busy(&ctx->m2m_ctx->cap_q_ctx.q)) {
+		mtk_v4l2_err("cap_q_ctx buffers already requested");
+		ret = -EBUSY;
+	}
+
+	vq = v4l2_m2m_get_vq(ctx->m2m_ctx, f->type);
+
+	q_data = mtk_vdec_get_q_data(ctx, f->type);
+	if (!q_data)
+		return -EINVAL;
+
+	q_data->fmt = fmt;
+	if (f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) {
+		q_data->sizeimage[0] = pix_mp->plane_fmt[0].sizeimage;
+		pix_mp->plane_fmt[0].bytesperline = 0;
+		pix_mp->width = 0;
+		pix_mp->height = 0;
+
+		if (ctx->state == MTK_STATE_FREE) {
+			ret = vdec_if_init(ctx, q_data->fmt->fourcc);
+			if (ret) {
+				mtk_v4l2_err("[%d]: vdec_if_init() fail ret=%d",
+					ctx->id, ret);
+				return -EINVAL;
+			}
+			ctx->state = MTK_STATE_INIT;
+		}
+	}
+
+	return 0;
+}
+
+static int vidioc_enum_framesizes(struct file *file, void *priv,
+				struct v4l2_frmsizeenum *fsize)
+{
+	int i = 0;
+	struct mtk_vcodec_ctx *ctx = fh_to_ctx(priv);
+
+	if (fsize->index != 0)
+		return -EINVAL;
+
+	for (i = 0; i < NUM_SUPPORTED_FRAMESIZE; ++i) {
+		if (fsize->pixel_format != mtk_vdec_framesizes[i].fourcc)
+			continue;
+
+		fsize->type = V4L2_FRMSIZE_TYPE_STEPWISE;
+		fsize->stepwise = mtk_vdec_framesizes[i].stepwise;
+		if (!(ctx->dev->dec_capability &
+				VCODEC_CAPABILITY_4K_DISABLED)) {
+			mtk_v4l2_debug(3, "4K is enabled");
+			fsize->stepwise.max_width =
+					VCODEC_DEC_4K_CODED_WIDTH;
+			fsize->stepwise.max_height =
+					VCODEC_DEC_4K_CODED_HEIGHT;
+		}
+		mtk_v4l2_debug(1, "%x, %d %d %d %d %d %d",
+				ctx->dev->dec_capability,
+				fsize->stepwise.min_width,
+				fsize->stepwise.max_width,
+				fsize->stepwise.step_width,
+				fsize->stepwise.min_height,
+				fsize->stepwise.max_height,
+				fsize->stepwise.step_height);
+		return 0;
+	}
+
+	return -EINVAL;
+}
+
+static int vidioc_enum_fmt(struct v4l2_fmtdesc *f, bool output_queue)
+{
+	struct mtk_video_fmt *fmt;
+	int i, j = 0;
+
+	for (i = 0; i < NUM_FORMATS; i++) {
+		if (output_queue && (mtk_video_formats[i].type != MTK_FMT_DEC))
+			continue;
+		if (!output_queue &&
+			(mtk_video_formats[i].type != MTK_FMT_FRAME))
+			continue;
+
+		if (j == f->index)
+			break;
+		++j;
+	}
+
+	if (i == NUM_FORMATS)
+		return -EINVAL;
+
+	fmt = &mtk_video_formats[i];
+	f->pixelformat = fmt->fourcc;
+
+	return 0;
+}
+
+static int vidioc_vdec_enum_fmt_vid_cap_mplane(struct file *file, void *pirv,
+					       struct v4l2_fmtdesc *f)
+{
+	return vidioc_enum_fmt(f, false);
+}
+
+static int vidioc_vdec_enum_fmt_vid_out_mplane(struct file *file, void *priv,
+					       struct v4l2_fmtdesc *f)
+{
+	return vidioc_enum_fmt(f, true);
+}
+
+static int vidioc_vdec_g_fmt(struct file *file, void *priv,
+			     struct v4l2_format *f)
+{
+	struct mtk_vcodec_ctx *ctx = fh_to_ctx(priv);
+	struct v4l2_pix_format_mplane *pix_mp = &f->fmt.pix_mp;
+	struct vb2_queue *vq;
+	struct mtk_q_data *q_data;
+
+	vq = v4l2_m2m_get_vq(ctx->m2m_ctx, f->type);
+	if (!vq) {
+		mtk_v4l2_err("no vb2 queue for type=%d",
+			f->type);
+		return -EINVAL;
+	}
+
+	q_data = mtk_vdec_get_q_data(ctx, f->type);
+
+	if ((f->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) &&
+	    (ctx->state >= MTK_STATE_HEADER)) {
+		/* Until STREAMOFF is called on the CAPTURE queue
+		 * (acknowledging the event), the driver operates as if
+		 * the resolution hasn't changed yet.
+		 * So we just return picinfo yet, and update picinfo in
+		 * stop_streaming hook function
+		 */
+		q_data->sizeimage[0] = ctx->picinfo.y_bs_sz +
+					ctx->picinfo.y_len_sz;
+		q_data->sizeimage[1] = ctx->picinfo.c_bs_sz +
+					ctx->picinfo.c_len_sz;
+		q_data->bytesperline[0] = ctx->last_decoded_picinfo.buf_w;
+		q_data->bytesperline[1] = ctx->last_decoded_picinfo.buf_w;
+		q_data->coded_width = ctx->picinfo.buf_w;
+		q_data->coded_height = ctx->picinfo.buf_h;
+
+		/*
+		 * Width and height are set to the dimensions
+		 * of the movie, the buffer is bigger and
+		 * further processing stages should crop to this
+		 * rectangle.
+		 */
+		pix_mp->width = q_data->coded_width;
+		pix_mp->height = q_data->coded_height;
+		pix_mp->field = V4L2_FIELD_NONE;
+
+		/*
+		 * Set pixelformat to the format in which mt vcodec
+		 * outputs the decoded frame
+		 */
+		pix_mp->num_planes = q_data->fmt->num_planes;
+		pix_mp->pixelformat = q_data->fmt->fourcc;
+		pix_mp->plane_fmt[0].bytesperline = q_data->bytesperline[0];
+		pix_mp->plane_fmt[0].sizeimage = q_data->sizeimage[0];
+		pix_mp->plane_fmt[1].bytesperline = q_data->bytesperline[1];
+		pix_mp->plane_fmt[1].sizeimage = q_data->sizeimage[1];
+
+	} else if (f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) {
+		/*
+		 * This is run on OUTPUT
+		 * The buffer contains compressed image
+		 * so width and height have no meaning.
+		 * Assign value here to pass v4l2-compliance test
+		 */
+		pix_mp->width = q_data->visible_width;
+		pix_mp->height = q_data->visible_height;
+		pix_mp->field = V4L2_FIELD_NONE;
+		pix_mp->plane_fmt[0].bytesperline = q_data->bytesperline[0];
+		pix_mp->plane_fmt[0].sizeimage = q_data->sizeimage[0];
+		pix_mp->pixelformat = q_data->fmt->fourcc;
+		pix_mp->num_planes = q_data->fmt->num_planes;
+	} else {
+		pix_mp->width = q_data->coded_width;
+		pix_mp->height = q_data->coded_height;
+		pix_mp->field = V4L2_FIELD_NONE;
+		pix_mp->num_planes = q_data->fmt->num_planes;
+		pix_mp->pixelformat = q_data->fmt->fourcc;
+		pix_mp->plane_fmt[0].bytesperline = q_data->bytesperline[0];
+		pix_mp->plane_fmt[0].sizeimage = q_data->sizeimage[0];
+		pix_mp->plane_fmt[1].bytesperline = q_data->bytesperline[1];
+		pix_mp->plane_fmt[1].sizeimage = q_data->sizeimage[1];
+
+		mtk_v4l2_debug(1, "[%d] state=%d Format could not be read %d, not ready yet!",
+				ctx->id, ctx->state, f->type);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int vb2ops_vdec_queue_setup(struct vb2_queue *vq,
+				unsigned int *nbuffers,
+				unsigned int *nplanes,
+				unsigned int sizes[], void *alloc_ctxs[])
+{
+	struct mtk_vcodec_ctx *ctx = vb2_get_drv_priv(vq);
+	struct mtk_q_data *q_data;
+	unsigned int i;
+
+	q_data = mtk_vdec_get_q_data(ctx, vq->type);
+
+	if (q_data == NULL) {
+		mtk_v4l2_err("vq->type=%d err\n", vq->type);
+		return -EINVAL;
+	}
+
+	if (*nplanes) {
+		for (i = 0; i < *nplanes; i++) {
+			if (sizes[i] < q_data->sizeimage[i])
+				return -EINVAL;
+			alloc_ctxs[i] = ctx->dev->alloc_ctx;
+		}
+	} else {
+
+		if (vq->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) {
+			if (ctx->state < MTK_STATE_HEADER) {
+				mtk_v4l2_err("State not ready");
+				return -EINVAL;
+			}
+			/*
+			 * Output plane count is 2 - one for Y and one for CbCr
+			 */
+			*nplanes = 2;
+		} else {
+			*nplanes = 1;
+		}
+
+		for (i = 0; i < *nplanes; i++) {
+			sizes[i] = q_data->sizeimage[i];
+			alloc_ctxs[i] = ctx->dev->alloc_ctx;
+		}
+	}
+
+	mtk_v4l2_debug(1,
+			"[%d]\t type = %d, get %d plane(s), %d buffer(s) of size 0x%x 0x%x ",
+			ctx->id, vq->type, *nplanes, *nbuffers,
+			sizes[0], sizes[1]);
+
+	return 0;
+}
+
+static int vb2ops_vdec_buf_prepare(struct vb2_buffer *vb)
+{
+	struct mtk_vcodec_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
+	struct mtk_q_data *q_data;
+	int i;
+
+	mtk_v4l2_debug(3, "[%d] (%d) id=%d",
+			ctx->id, vb->vb2_queue->type, vb->index);
+
+	q_data = mtk_vdec_get_q_data(ctx, vb->vb2_queue->type);
+
+	for (i = 0; i < q_data->fmt->num_planes; i++) {
+		if (vb2_plane_size(vb, i) > q_data->sizeimage[i]) {
+			mtk_v4l2_err("data will not fit into plane %d (%lu < %d)",
+				i, vb2_plane_size(vb, i),
+				q_data->sizeimage[i]);
+		}
+	}
+
+	return 0;
+}
+
+static void vb2ops_vdec_buf_queue(struct vb2_buffer *vb)
+{
+	struct mtk_vcodec_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
+	struct vb2_v4l2_buffer *vb2_v4l2 = container_of(vb,
+				struct vb2_v4l2_buffer, vb2_buf);
+	struct mtk_video_dec_buf *buf = container_of(vb2_v4l2,
+				struct mtk_video_dec_buf, vb);
+
+	mtk_v4l2_debug(3, "[%d] (%d) id=%d, vb=%p",
+			ctx->id, vb->vb2_queue->type,
+			vb->index, vb);
+	/*
+	 * check if this buffer is ready to be used after decode
+	 */
+	if (vb->vb2_queue->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) {
+		struct vb2_buffer *src_buf;
+		struct mtk_vcodec_mem src_mem;
+		bool res_chg = false;
+		int ret = 0;
+		unsigned int dpbsize = 1;
+
+		v4l2_m2m_buf_queue(ctx->m2m_ctx, vb2_v4l2);
+
+		if (ctx->state == MTK_STATE_INIT) {
+			src_buf = v4l2_m2m_next_src_buf(ctx->m2m_ctx);
+			if (!src_buf) {
+				mtk_v4l2_err("No src buffer");
+				return;
+			}
+
+			src_mem.va	= vb2_plane_vaddr(src_buf, 0);
+			src_mem.dma_addr = vb2_dma_contig_plane_dma_addr(
+						src_buf,
+						0);
+			src_mem.size = (size_t)src_buf->planes[0].bytesused;
+			mtk_v4l2_debug(2,
+					"[%d] buf id=%d va=%p dma=%llx size=%zu",
+					ctx->id, src_buf->index,
+					src_mem.va, (u64)src_mem.dma_addr,
+					src_mem.size);
+
+			ret = vdec_if_decode(ctx, &src_mem, NULL, &res_chg);
+			if (ret) {
+				/* fb == NULL menas to parse SPS/PPS header or
+				 * resolution info in src_mem. Decode can fail
+				 * if there is no SPS header or picture info
+				 * in bs
+				 */
+				src_buf = v4l2_m2m_src_buf_remove(ctx->m2m_ctx);
+				v4l2_m2m_buf_done(to_vb2_v4l2_buffer(src_buf),
+						VB2_BUF_STATE_DONE);
+				mtk_v4l2_debug(0, "[%d] vdec_if_decode() src_buf=%d, size=%zu, fail=%d",
+						ctx->id, src_buf->index,
+						src_mem.size, ret);
+				return;
+			}
+
+			if (vdec_if_get_param(ctx,
+						GET_PARAM_PIC_INFO,
+						&ctx->picinfo)) {
+				mtk_v4l2_err("[%d]Error!! Cannot get param : GET_PARAM_PICTURE_INFO ERR",
+						ctx->id);
+				return;
+			}
+
+			ctx->last_decoded_picinfo = ctx->picinfo;
+			ctx->q_data[MTK_Q_DATA_DST].sizeimage[0] =
+						ctx->picinfo.y_bs_sz +
+						ctx->picinfo.y_len_sz;
+			ctx->q_data[MTK_Q_DATA_DST].bytesperline[0] =
+						ctx->picinfo.buf_w;
+			ctx->q_data[MTK_Q_DATA_DST].sizeimage[1] =
+						ctx->picinfo.c_bs_sz +
+						ctx->picinfo.c_len_sz;
+			ctx->q_data[MTK_Q_DATA_DST].bytesperline[1] =
+						ctx->picinfo.buf_w;
+			mtk_v4l2_debug(2, "[%d] vdec_if_init() OK wxh=%dx%d pic wxh=%dx%d sz[0]=0x%x sz[1]=0x%x",
+				ctx->id,
+				ctx->picinfo.buf_w, ctx->picinfo.buf_h,
+				ctx->picinfo.pic_w, ctx->picinfo.pic_h,
+				ctx->q_data[MTK_Q_DATA_DST].sizeimage[0],
+				ctx->q_data[MTK_Q_DATA_DST].sizeimage[1]);
+
+			ret = vdec_if_get_param(ctx, GET_PARAM_DPB_SIZE,
+						&dpbsize);
+			if (dpbsize == 0) {
+				mtk_v4l2_err("[%d] vdec_if_get_param()  GET_PARAM_DPB_SIZE fail=%d",
+						ctx->id, ret);
+			}
+			ctx->dpb_size = dpbsize;
+			ctx->state = MTK_STATE_HEADER;
+			mtk_v4l2_debug(1, "[%d] dpbsize=%d", ctx->id,
+					ctx->dpb_size);
+		} else {
+			mtk_v4l2_debug(3, "[%d] already init driver %d",
+					ctx->id, ctx->state);
+		}
+	} else {
+		mutex_lock(&ctx->lock);
+		if (buf->used == false) {
+			v4l2_m2m_buf_queue(ctx->m2m_ctx,
+					to_vb2_v4l2_buffer(vb));
+			buf->queued_in_vb2 = true;
+			buf->queued_in_v4l2 = true;
+			buf->ready_to_display = false;
+		} else {
+			buf->queued_in_vb2 = false;
+			buf->queued_in_v4l2 = true;
+			buf->ready_to_display = false;
+		}
+		mutex_unlock(&ctx->lock);
+	}
+}
+
+static void vb2ops_vdec_buf_finish(struct vb2_buffer *vb)
+{
+	struct mtk_vcodec_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
+
+	if (vb->vb2_queue->type ==
+		V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) {
+		struct vb2_v4l2_buffer *vb2_v4l2;
+		struct mtk_video_dec_buf *buf;
+
+		vb2_v4l2 = container_of(vb, struct vb2_v4l2_buffer, vb2_buf);
+		buf = container_of(vb2_v4l2, struct mtk_video_dec_buf, vb);
+		mutex_lock(&ctx->lock);
+		buf->queued_in_v4l2 = false;
+		buf->queued_in_vb2 = false;
+		mutex_unlock(&ctx->lock);
+	}
+}
+
+static int vb2ops_vdec_buf_init(struct vb2_buffer *vb)
+{
+	struct vb2_v4l2_buffer *vb2_v4l2 = container_of(vb,
+					struct vb2_v4l2_buffer, vb2_buf);
+	struct mtk_video_dec_buf *buf = container_of(vb2_v4l2,
+					struct mtk_video_dec_buf, vb);
+
+	if (vb->vb2_queue->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) {
+		buf->used = false;
+		buf->ready_to_display = false;
+		buf->queued_in_v4l2 = false;
+	} else {
+		buf->lastframe = false;
+	}
+
+	return 0;
+}
+
+static int vb2ops_vdec_start_streaming(struct vb2_queue *q, unsigned int count)
+{
+	struct mtk_vcodec_ctx *ctx = vb2_get_drv_priv(q);
+
+	if (ctx->state == MTK_STATE_FLUSH)
+		ctx->state = MTK_STATE_HEADER;
+
+	return 0;
+}
+
+static void vb2ops_vdec_stop_streaming(struct vb2_queue *q)
+{
+	struct vb2_buffer *src_buf = NULL, *dst_buf = NULL;
+	struct mtk_vcodec_ctx *ctx = vb2_get_drv_priv(q);
+
+	mtk_v4l2_debug(3, "[%d] (%d) state=(%x) ctx->decoded_frame_cnt=%d",
+			ctx->id, q->type, ctx->state, ctx->decoded_frame_cnt);
+
+	if (q->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) {
+		while ((src_buf = v4l2_m2m_src_buf_remove(ctx->m2m_ctx)))
+			v4l2_m2m_buf_done(to_vb2_v4l2_buffer(src_buf),
+					VB2_BUF_STATE_ERROR);
+
+	} else if (q->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) {
+		if (ctx->state >= MTK_STATE_HEADER) {
+
+			/* Until STREAMOFF is called on the CAPTURE queue
+			 * (acknowledging the event), the driver operates
+			 * as if the resolution hasn't changed yet, i.e.
+			 * VIDIOC_G_FMT< etc. return previous resolution.
+			 * So we update picinfo here
+			 */
+			ctx->picinfo = ctx->last_decoded_picinfo;
+
+			mtk_v4l2_debug(2,
+				"[%d]-> new(%d,%d), old(%d,%d), real(%d,%d)",
+				ctx->id, ctx->last_decoded_picinfo.pic_w,
+				ctx->last_decoded_picinfo.pic_h,
+				ctx->picinfo.pic_w, ctx->picinfo.pic_h,
+				ctx->last_decoded_picinfo.buf_w,
+				ctx->last_decoded_picinfo.buf_h);
+
+			mtk_vdec_flush_decoder(ctx);
+		}
+		ctx->state = MTK_STATE_FLUSH;
+
+		while ((dst_buf = v4l2_m2m_dst_buf_remove(ctx->m2m_ctx))) {
+			vb2_set_plane_payload(dst_buf, 0, 0);
+			vb2_set_plane_payload(dst_buf, 1, 0);
+			v4l2_m2m_buf_done(to_vb2_v4l2_buffer(dst_buf),
+					VB2_BUF_STATE_ERROR);
+		}
+	}
+}
+
+static void m2mops_vdec_device_run(void *priv)
+{
+	struct mtk_vcodec_ctx *ctx = priv;
+	struct mtk_vcodec_dev *dev = ctx->dev;
+
+	queue_work(dev->decode_workqueue, &ctx->decode_work);
+}
+
+static int m2mops_vdec_job_ready(void *m2m_priv)
+{
+	struct mtk_vcodec_ctx *ctx = m2m_priv;
+
+	mtk_v4l2_debug(3, "[%d]", ctx->id);
+
+	if (ctx->state == MTK_STATE_ABORT)
+		return 0;
+
+	if ((ctx->last_decoded_picinfo.pic_w != ctx->picinfo.pic_w) ||
+	    (ctx->last_decoded_picinfo.pic_h != ctx->picinfo.pic_h))
+		return 0;
+
+	if (ctx->state != MTK_STATE_HEADER)
+		return 0;
+
+	return 1;
+}
+
+static void m2mops_vdec_job_abort(void *priv)
+{
+	struct mtk_vcodec_ctx *ctx = priv;
+
+	ctx->state = MTK_STATE_ABORT;
+}
+
+static int mtk_vdec_g_v_ctrl(struct v4l2_ctrl *ctrl)
+{
+	struct mtk_vcodec_ctx *ctx = ctrl_to_ctx(ctrl);
+	int ret = 0;
+
+	switch (ctrl->id) {
+	case V4L2_CID_MIN_BUFFERS_FOR_CAPTURE:
+		if (ctx->state >= MTK_STATE_HEADER) {
+			ctrl->val = ctx->dpb_size;
+		} else {
+			mtk_v4l2_err("Seqinfo not ready");
+			ctrl->val = 1;
+			ret = -EAGAIN;
+		}
+		break;
+	default:
+		ret = -EINVAL;
+	}
+	return ret;
+}
+
+static const struct v4l2_ctrl_ops mtk_vcodec_dec_ctrl_ops = {
+	.g_volatile_ctrl = mtk_vdec_g_v_ctrl,
+};
+
+int mtk_vcodec_dec_ctrls_setup(struct mtk_vcodec_ctx *ctx)
+{
+	struct v4l2_ctrl *ctrl;
+
+	v4l2_ctrl_handler_init(&ctx->ctrl_hdl, 1);
+
+	ctrl = v4l2_ctrl_new_std(&ctx->ctrl_hdl,
+				&mtk_vcodec_dec_ctrl_ops,
+				V4L2_CID_MIN_BUFFERS_FOR_CAPTURE,
+				1, 32, 1, 1);
+	ctrl->flags |= V4L2_CTRL_FLAG_VOLATILE;
+
+	if (ctx->ctrl_hdl.error) {
+		mtk_v4l2_err("Adding control failed %d",
+				ctx->ctrl_hdl.error);
+		return ctx->ctrl_hdl.error;
+	}
+
+	v4l2_ctrl_handler_setup(&ctx->ctrl_hdl);
+	return 0;
+}
+
+static void m2mops_vdec_lock(void *m2m_priv)
+{
+	struct mtk_vcodec_ctx *ctx = m2m_priv;
+
+	mtk_v4l2_debug(3, "[%d]", ctx->id);
+	mutex_lock(&ctx->dev->dev_mutex);
+}
+
+static void m2mops_vdec_unlock(void *m2m_priv)
+{
+	struct mtk_vcodec_ctx *ctx = m2m_priv;
+
+	mtk_v4l2_debug(3, "[%d]", ctx->id);
+	mutex_unlock(&ctx->dev->dev_mutex);
+}
+
+const struct v4l2_m2m_ops mtk_vdec_m2m_ops = {
+	.device_run	= m2mops_vdec_device_run,
+	.job_ready	= m2mops_vdec_job_ready,
+	.job_abort	= m2mops_vdec_job_abort,
+	.lock		= m2mops_vdec_lock,
+	.unlock		= m2mops_vdec_unlock,
+};
+
+static const struct vb2_ops mtk_vdec_vb2_ops = {
+	.queue_setup	= vb2ops_vdec_queue_setup,
+	.buf_prepare	= vb2ops_vdec_buf_prepare,
+	.buf_queue	= vb2ops_vdec_buf_queue,
+	.wait_prepare	= vb2_ops_wait_prepare,
+	.wait_finish	= vb2_ops_wait_finish,
+	.buf_init	= vb2ops_vdec_buf_init,
+	.buf_finish	= vb2ops_vdec_buf_finish,
+	.start_streaming	= vb2ops_vdec_start_streaming,
+	.stop_streaming	= vb2ops_vdec_stop_streaming,
+};
+
+const struct v4l2_ioctl_ops mtk_vdec_ioctl_ops = {
+	.vidioc_streamon	= v4l2_m2m_ioctl_streamon,
+	.vidioc_streamoff	= v4l2_m2m_ioctl_streamoff,
+	.vidioc_reqbufs		= v4l2_m2m_ioctl_reqbufs,
+	.vidioc_querybuf	= v4l2_m2m_ioctl_querybuf,
+	.vidioc_expbuf		= v4l2_m2m_ioctl_expbuf,
+
+	.vidioc_qbuf		= vidioc_vdec_qbuf,
+	.vidioc_dqbuf		= vidioc_vdec_dqbuf,
+
+	.vidioc_try_fmt_vid_cap_mplane	= vidioc_try_fmt_vid_cap_mplane,
+	.vidioc_try_fmt_vid_out_mplane	= vidioc_try_fmt_vid_out_mplane,
+
+	.vidioc_s_fmt_vid_cap_mplane	= vidioc_vdec_s_fmt,
+	.vidioc_s_fmt_vid_out_mplane	= vidioc_vdec_s_fmt,
+	.vidioc_g_fmt_vid_cap_mplane	= vidioc_vdec_g_fmt,
+	.vidioc_g_fmt_vid_out_mplane	= vidioc_vdec_g_fmt,
+
+	.vidioc_enum_fmt_vid_cap_mplane	= vidioc_vdec_enum_fmt_vid_cap_mplane,
+	.vidioc_enum_fmt_vid_out_mplane	= vidioc_vdec_enum_fmt_vid_out_mplane,
+	.vidioc_enum_framesizes	= vidioc_enum_framesizes,
+
+	.vidioc_querycap		= vidioc_vdec_querycap,
+	.vidioc_subscribe_event		= vidioc_vdec_subscribe_evt,
+	.vidioc_unsubscribe_event	= v4l2_event_unsubscribe,
+	.vidioc_g_selection             = vidioc_vdec_g_selection,
+};
+
+int mtk_vcodec_dec_queue_init(void *priv, struct vb2_queue *src_vq,
+			   struct vb2_queue *dst_vq)
+{
+	struct mtk_vcodec_ctx *ctx = priv;
+	int ret = 0;
+
+	mtk_v4l2_debug(3, "[%d]", ctx->id);
+
+	src_vq->type		= V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
+	src_vq->io_modes	= VB2_DMABUF | VB2_MMAP;
+	src_vq->drv_priv	= ctx;
+	src_vq->buf_struct_size = sizeof(struct mtk_video_dec_buf);
+	src_vq->ops		= &mtk_vdec_vb2_ops;
+	src_vq->mem_ops		= &vb2_dma_contig_memops;
+	src_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
+	src_vq->lock		= &ctx->dev->dev_mutex;
+
+	ret = vb2_queue_init(src_vq);
+	if (ret) {
+		mtk_v4l2_err("Failed to initialize videobuf2 queue(output)");
+		return ret;
+	}
+	dst_vq->type		= V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
+	dst_vq->io_modes	= VB2_DMABUF | VB2_MMAP;
+	dst_vq->drv_priv	= ctx;
+	dst_vq->buf_struct_size = sizeof(struct mtk_video_dec_buf);
+	dst_vq->ops		= &mtk_vdec_vb2_ops;
+	dst_vq->mem_ops		= &vb2_dma_contig_memops;
+	dst_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
+	dst_vq->lock		= &ctx->dev->dev_mutex;
+
+	ret = vb2_queue_init(dst_vq);
+	if (ret) {
+		vb2_queue_release(src_vq);
+		mtk_v4l2_err("Failed to initialize videobuf2 queue(capture)");
+	}
+
+	return ret;
+}
+
diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.h b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.h
new file mode 100644
index 0000000..595c244
--- /dev/null
+++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.h
@@ -0,0 +1,88 @@ 
+/*
+* Copyright (c) 2016 MediaTek Inc.
+* Author: PC Chen <[e-mail]>
+*         Tiffany Lin <[e-mail]>
+*
+* This program is free software; you can redistribute it and/or modify
+* it under the terms of the GNU General Public License version 2 as
+* published by the Free Software Foundation.
+*
+* This program is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+* GNU General Public License for more details.
+*/
+
+#ifndef _MTK_VCODEC_DEC_H_
+#define _MTK_VCODEC_DEC_H_
+
+#include <media/videobuf2-core.h>
+#include <media/videobuf2-v4l2.h>
+
+#define VCODEC_CAPABILITY_4K_DISABLED	0x10
+#define VCODEC_DEC_4K_CODED_WIDTH	4096U
+#define VCODEC_DEC_4K_CODED_HEIGHT	2304U
+#define MTK_VDEC_MAX_W	2048U
+#define MTK_VDEC_MAX_H	1088U
+
+#define MTK_VDEC_IRQ_STATUS_DEC_SUCCESS        0x10000
+
+/**
+ * struct vdec_fb  - decoder frame buffer
+ * @base_y	: Y plane memory info
+ * @base_c	: C plane memory info
+ * @status      : frame buffer status (vdec_fb_status)
+ */
+struct vdec_fb {
+	struct mtk_vcodec_mem	base_y;
+	struct mtk_vcodec_mem	base_c;
+	unsigned int	status;
+};
+
+/**
+ * struct mtk_video_dec_buf - Private data related to each VB2 buffer.
+ * @b:		VB2 buffer
+ * @list:	link list
+ * @used:	Capture buffer contain decoded frame data and keep in
+ *			codec data structure
+ * @ready_to_display:	Capture buffer not display yet
+ * @queued_in_vb2:	Capture buffer is queue in vb2
+ * @queued_in_v4l2:	Capture buffer is in v4l2 driver, but not in vb2
+ *			queue yet
+ * @lastframe:		Intput buffer is last buffer - EOS
+ * @frame_buffer:	Decode status, and buffer information of Capture buffer
+ *
+ * Note : These status information help us track and debug buffer state
+ */
+struct mtk_video_dec_buf {
+	struct vb2_v4l2_buffer	vb;
+	struct list_head	list;
+
+	bool	used;
+	bool	ready_to_display;
+	bool	queued_in_vb2;
+	bool	queued_in_v4l2;
+	bool	lastframe;
+	struct vdec_fb	frame_buffer;
+};
+
+extern const struct v4l2_ioctl_ops mtk_vdec_ioctl_ops;
+extern const struct v4l2_m2m_ops mtk_vdec_m2m_ops;
+
+
+/*
+ * mtk_vdec_lock/mtk_vdec_unlock are for ctx instance to
+ * get/release lock before/after access decoder hw.
+ * mtk_vdec_lock get decoder hw lock and set curr_ctx
+ * to ctx instance that get lock
+ */
+void mtk_vdec_unlock(struct mtk_vcodec_ctx *ctx);
+void mtk_vdec_lock(struct mtk_vcodec_ctx *ctx);
+int mtk_vcodec_dec_queue_init(void *priv, struct vb2_queue *src_vq,
+			   struct vb2_queue *dst_vq);
+void mtk_vcodec_dec_set_default_params(struct mtk_vcodec_ctx *ctx);
+void mtk_vcodec_vdec_release(struct mtk_vcodec_ctx *ctx);
+int mtk_vcodec_dec_ctrls_setup(struct mtk_vcodec_ctx *ctx);
+
+
+#endif /* _MTK_VCODEC_DEC_H_ */
diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c
new file mode 100644
index 0000000..725d1e5
--- /dev/null
+++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c
@@ -0,0 +1,408 @@ 
+/*
+* Copyright (c) 2016 MediaTek Inc.
+* Author: PC Chen <[e-mail]>
+*         Tiffany Lin <[e-mail]>
+*
+* This program is free software; you can redistribute it and/or modify
+* it under the terms of the GNU General Public License version 2 as
+* published by the Free Software Foundation.
+*
+* This program is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+* GNU General Public License for more details.
+*/
+
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/of.h>
+#include <media/v4l2-event.h>
+#include <media/v4l2-mem2mem.h>
+#include <media/videobuf2-dma-contig.h>
+
+#include "mtk_vcodec_drv.h"
+#include "mtk_vcodec_dec.h"
+#include "mtk_vcodec_dec_pm.h"
+#include "mtk_vcodec_intr.h"
+#include "mtk_vcodec_util.h"
+#include "mtk_vpu.h"
+
+#define VDEC_HW_ACTIVE	0x10
+#define VDEC_IRQ_CFG	0x11
+#define VDEC_IRQ_CLR	0x10
+#define VDEC_IRQ_CFG_REG	0xa4
+
+module_param(mtk_v4l2_dbg_level, int, S_IRUGO | S_IWUSR);
+module_param(mtk_vcodec_dbg, bool, S_IRUGO | S_IWUSR);
+
+/* Wake up context wait_queue */
+static void wake_up_ctx(struct mtk_vcodec_ctx *ctx)
+{
+	ctx->int_cond = 1;
+	wake_up_interruptible(&ctx->queue);
+}
+
+static irqreturn_t mtk_vcodec_dec_irq_handler(int irq, void *priv)
+{
+	struct mtk_vcodec_dev *dev = priv;
+	struct mtk_vcodec_ctx *ctx;
+	u32 cg_status = 0;
+	unsigned int dec_done_status = 0;
+	void __iomem *vdec_misc_addr = dev->reg_base[VDEC_MISC] +
+					VDEC_IRQ_CFG_REG;
+
+	ctx = mtk_vcodec_get_curr_ctx(dev);
+
+	/* check if HW active or not */
+	cg_status = readl(dev->reg_base[0]);
+	if ((cg_status & VDEC_HW_ACTIVE) != 0) {
+		mtk_v4l2_err("DEC ISR, VDEC active is not 0x0 (0x%08x)",
+			     cg_status);
+		return IRQ_HANDLED;
+	}
+
+	dec_done_status = readl(vdec_misc_addr);
+	ctx->irq_status = dec_done_status;
+	if ((dec_done_status & MTK_VDEC_IRQ_STATUS_DEC_SUCCESS) !=
+		MTK_VDEC_IRQ_STATUS_DEC_SUCCESS)
+		return IRQ_HANDLED;
+
+	/* clear interrupt */
+	writel((readl(vdec_misc_addr) | VDEC_IRQ_CFG),
+		dev->reg_base[VDEC_MISC] + VDEC_IRQ_CFG_REG);
+	writel((readl(vdec_misc_addr) & ~VDEC_IRQ_CLR),
+		dev->reg_base[VDEC_MISC] + VDEC_IRQ_CFG_REG);
+
+	wake_up_ctx(ctx);
+
+	mtk_v4l2_debug(3,
+			"mtk_vcodec_dec_irq_handler :wake up ctx %d, dec_done_status=%x",
+			ctx->id, dec_done_status);
+
+	return IRQ_HANDLED;
+}
+
+static void mtk_vcodec_dec_reset_handler(void *priv)
+{
+	struct mtk_vcodec_dev *dev = priv;
+	struct mtk_vcodec_ctx *ctx;
+
+	mtk_v4l2_err("Watchdog timeout!!");
+
+	mutex_lock(&dev->dev_mutex);
+	list_for_each_entry(ctx, &dev->ctx_list, list) {
+		ctx->state = MTK_STATE_ABORT;
+		mtk_v4l2_debug(0, "[%d] Change to state MTK_STATE_ERROR",
+				ctx->id);
+	}
+	mutex_unlock(&dev->dev_mutex);
+}
+
+static int fops_vcodec_open(struct file *file)
+{
+	struct mtk_vcodec_dev *dev = video_drvdata(file);
+	struct mtk_vcodec_ctx *ctx = NULL;
+	int ret = 0;
+
+	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
+	if (!ctx)
+		return -ENOMEM;
+
+	mutex_lock(&dev->dev_mutex);
+	ctx->id = dev->id_counter++;
+	v4l2_fh_init(&ctx->fh, video_devdata(file));
+	file->private_data = &ctx->fh;
+	v4l2_fh_add(&ctx->fh);
+	INIT_LIST_HEAD(&ctx->list);
+	ctx->dev = dev;
+	init_waitqueue_head(&ctx->queue);
+	mutex_init(&ctx->lock);
+
+	ctx->type = MTK_INST_DECODER;
+	ret = mtk_vcodec_dec_ctrls_setup(ctx);
+	if (ret) {
+		mtk_v4l2_err("Failed to setup mt vcodec controls");
+		goto err_ctrls_setup;
+	}
+	ctx->m2m_ctx = v4l2_m2m_ctx_init(dev->m2m_dev_dec, ctx,
+		&mtk_vcodec_dec_queue_init);
+	if (IS_ERR((__force void *)ctx->m2m_ctx)) {
+		ret = PTR_ERR((__force void *)ctx->m2m_ctx);
+		mtk_v4l2_err("Failed to v4l2_m2m_ctx_init() (%d)",
+			ret);
+		goto err_m2m_ctx_init;
+	}
+	mtk_vcodec_dec_set_default_params(ctx);
+
+	if (v4l2_fh_is_singular(&ctx->fh)) {
+		mtk_vcodec_dec_pw_on(&dev->pm);
+		/*
+		 * vpu_load_firmware checks if it was loaded already and
+		 * does nothing in that case
+		 */
+		ret = vpu_load_firmware(dev->vpu_plat_dev);
+		if (ret < 0) {
+			/*
+			 * Return 0 if downloading firmware successfully,
+			 * otherwise it is failed
+			 */
+			mtk_v4l2_err("vpu_load_firmware failed!");
+			goto err_load_fw;
+		}
+
+		dev->dec_capability =
+			vpu_get_vdec_hw_capa(dev->vpu_plat_dev);
+		mtk_v4l2_debug(0, "decoder capability %x", dev->dec_capability);
+	}
+
+	dev->num_instances++;
+	list_add(&ctx->list, &dev->ctx_list);
+
+	mutex_unlock(&dev->dev_mutex);
+	mtk_v4l2_debug(0, "%s decoder [%d]", dev_name(&dev->plat_dev->dev),
+			ctx->id);
+	return ret;
+
+	/* Deinit when failure occurred */
+err_load_fw:
+	v4l2_m2m_ctx_release(ctx->m2m_ctx);
+err_m2m_ctx_init:
+	v4l2_ctrl_handler_free(&ctx->ctrl_hdl);
+err_ctrls_setup:
+	v4l2_fh_del(&ctx->fh);
+	v4l2_fh_exit(&ctx->fh);
+	kfree(ctx);
+	mutex_unlock(&dev->dev_mutex);
+
+	return ret;
+}
+
+static int fops_vcodec_release(struct file *file)
+{
+	struct mtk_vcodec_dev *dev = video_drvdata(file);
+	struct mtk_vcodec_ctx *ctx = fh_to_ctx(file->private_data);
+
+	mtk_v4l2_debug(0, "[%d] decoder", ctx->id);
+	mutex_lock(&dev->dev_mutex);
+
+	mtk_vcodec_vdec_release(ctx);
+	if (v4l2_fh_is_singular(&ctx->fh))
+		mtk_vcodec_dec_pw_off(&dev->pm);
+
+	v4l2_fh_del(&ctx->fh);
+	v4l2_fh_exit(&ctx->fh);
+	v4l2_ctrl_handler_free(&ctx->ctrl_hdl);
+	v4l2_m2m_ctx_release(ctx->m2m_ctx);
+
+	list_del_init(&ctx->list);
+	dev->num_instances--;
+	kfree(ctx);
+	mutex_unlock(&dev->dev_mutex);
+	return 0;
+}
+
+static const struct v4l2_file_operations mtk_vcodec_fops = {
+	.owner		= THIS_MODULE,
+	.open		= fops_vcodec_open,
+	.release	= fops_vcodec_release,
+	.poll		= v4l2_m2m_fop_poll,
+	.unlocked_ioctl	= video_ioctl2,
+	.mmap		= v4l2_m2m_fop_mmap,
+};
+
+static int mtk_vcodec_probe(struct platform_device *pdev)
+{
+	struct mtk_vcodec_dev *dev;
+	struct video_device *vfd_dec;
+	struct resource *res;
+	int i, ret;
+	DEFINE_DMA_ATTRS(attrs);
+
+	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
+	if (!dev)
+		return -ENOMEM;
+
+	INIT_LIST_HEAD(&dev->ctx_list);
+	dev->plat_dev = pdev;
+
+	dev->vpu_plat_dev = vpu_get_plat_device(dev->plat_dev);
+	if (dev->vpu_plat_dev == NULL) {
+		mtk_v4l2_err("[VPU] vpu device in not ready");
+		return -EPROBE_DEFER;
+	}
+
+	vpu_wdt_reg_handler(dev->vpu_plat_dev, mtk_vcodec_dec_reset_handler,
+			dev, VPU_RST_DEC);
+
+	ret = mtk_vcodec_init_dec_pm(dev);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "Failed to get mt vcodec clock source");
+		return ret;
+	}
+
+	for (i = 0; i < NUM_MAX_VDEC_REG_BASE; i++) {
+		res = platform_get_resource(pdev, IORESOURCE_MEM, i);
+		if (res == NULL) {
+			dev_err(&pdev->dev, "get memory resource failed.");
+			ret = -ENXIO;
+			goto err_res;
+		}
+		dev->reg_base[i] = devm_ioremap_resource(&pdev->dev, res);
+		if (IS_ERR((__force void *)dev->reg_base[i])) {
+			dev_err(&pdev->dev,
+				"devm_ioremap_resource %d failed.", i);
+			ret = PTR_ERR((__force void *)dev->reg_base);
+			goto err_res;
+		}
+		mtk_v4l2_debug(2, "reg[%d] base=%p", i, dev->reg_base[i]);
+	}
+
+	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+	if (res == NULL) {
+		dev_err(&pdev->dev, "failed to get irq resource");
+		ret = -ENOENT;
+		goto err_res;
+	}
+
+	dev->dec_irq = platform_get_irq(pdev, 0);
+	ret = devm_request_irq(&pdev->dev, dev->dec_irq,
+			mtk_vcodec_dec_irq_handler, 0, pdev->name, dev);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to install dev->dec_irq %d (%d)",
+			dev->dec_irq,
+			ret);
+		goto err_res;
+	}
+
+	disable_irq(dev->dec_irq);
+	mutex_init(&dev->dec_mutex);
+	mutex_init(&dev->dev_mutex);
+	spin_lock_init(&dev->irqlock);
+
+	snprintf(dev->v4l2_dev.name, sizeof(dev->v4l2_dev.name), "%s",
+		"[/MTK_V4L2_VDEC]");
+
+	ret = v4l2_device_register(&pdev->dev, &dev->v4l2_dev);
+	if (ret) {
+		mtk_v4l2_err("v4l2_device_register err=%d", ret);
+		goto err_res;
+	}
+
+	init_waitqueue_head(&dev->queue);
+
+	vfd_dec = video_device_alloc();
+	if (!vfd_dec) {
+		mtk_v4l2_err("Failed to allocate video device");
+		ret = -ENOMEM;
+		goto err_dec_alloc;
+	}
+	vfd_dec->fops		= &mtk_vcodec_fops;
+	vfd_dec->ioctl_ops	= &mtk_vdec_ioctl_ops;
+	vfd_dec->release	= video_device_release;
+	vfd_dec->lock		= &dev->dev_mutex;
+	vfd_dec->v4l2_dev	= &dev->v4l2_dev;
+	vfd_dec->vfl_dir	= VFL_DIR_M2M;
+	vfd_dec->device_caps	= V4L2_CAP_VIDEO_M2M_MPLANE |
+			V4L2_CAP_STREAMING;
+
+	snprintf(vfd_dec->name, sizeof(vfd_dec->name), "%s",
+		MTK_VCODEC_DEC_NAME);
+	video_set_drvdata(vfd_dec, dev);
+	dev->vfd_dec = vfd_dec;
+	platform_set_drvdata(pdev, dev);
+
+	dev->alloc_ctx = vb2_dma_contig_init_ctx(&pdev->dev);
+	if (IS_ERR((__force void *)dev->alloc_ctx)) {
+		mtk_v4l2_err("Failed to alloc vb2 dma context 0");
+		ret = PTR_ERR((__force void *)dev->alloc_ctx);
+		goto err_vb2_ctx_init;
+	}
+
+	dev->m2m_dev_dec = v4l2_m2m_init(&mtk_vdec_m2m_ops);
+	if (IS_ERR((__force void *)dev->m2m_dev_dec)) {
+		mtk_v4l2_err("Failed to init mem2mem dec device");
+		ret = PTR_ERR((__force void *)dev->m2m_dev_dec);
+		goto err_dec_mem_init;
+	}
+
+	dev->decode_workqueue =
+		alloc_ordered_workqueue(MTK_VCODEC_DEC_NAME,
+			WQ_MEM_RECLAIM | WQ_FREEZABLE);
+	if (!dev->decode_workqueue) {
+		mtk_v4l2_err("Failed to create decode workqueue");
+		ret = -EINVAL;
+		goto err_event_workq;
+	}
+
+	ret = video_register_device(vfd_dec, VFL_TYPE_GRABBER, 0);
+	if (ret) {
+		mtk_v4l2_err("Failed to register video device");
+		goto err_dec_reg;
+	}
+
+	/* Avoid the iommu eat big hunks */
+	dma_set_attr(DMA_ATTR_ALLOC_SINGLE_PAGES, &attrs);
+
+	mtk_v4l2_debug(0, "decoder registered as /dev/video%d",
+		vfd_dec->num);
+
+	return 0;
+
+err_dec_reg:
+	destroy_workqueue(dev->decode_workqueue);
+err_event_workq:
+	v4l2_m2m_release(dev->m2m_dev_dec);
+err_dec_mem_init:
+	vb2_dma_contig_cleanup_ctx(dev->alloc_ctx);
+err_vb2_ctx_init:
+	video_unregister_device(vfd_dec);
+err_dec_alloc:
+	v4l2_device_unregister(&dev->v4l2_dev);
+err_res:
+	mtk_vcodec_release_dec_pm(dev);
+	return ret;
+}
+
+static const struct of_device_id mtk_vcodec_match[] = {
+	{.compatible = "mediatek,mt8173-vcodec-dec",},
+	{},
+};
+
+MODULE_DEVICE_TABLE(of, mtk_vcodec_match);
+
+static int mtk_vcodec_dec_remove(struct platform_device *pdev)
+{
+	struct mtk_vcodec_dev *dev = platform_get_drvdata(pdev);
+
+	flush_workqueue(dev->decode_workqueue);
+	destroy_workqueue(dev->decode_workqueue);
+	if (dev->m2m_dev_dec)
+		v4l2_m2m_release(dev->m2m_dev_dec);
+	if (dev->alloc_ctx)
+		vb2_dma_contig_cleanup_ctx(dev->alloc_ctx);
+
+	if (dev->vfd_dec)
+		video_unregister_device(dev->vfd_dec);
+
+	v4l2_device_unregister(&dev->v4l2_dev);
+	mtk_vcodec_release_dec_pm(dev);
+	return 0;
+}
+
+static struct platform_driver mtk_vcodec_dec_driver = {
+	.probe	= mtk_vcodec_probe,
+	.remove	= mtk_vcodec_dec_remove,
+	.driver	= {
+		.name	= MTK_VCODEC_DEC_NAME,
+		.owner	= THIS_MODULE,
+		.of_match_table = mtk_vcodec_match,
+	},
+};
+
+module_platform_driver(mtk_vcodec_dec_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Mediatek video codec V4L2 decoder driver");
diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_pm.c b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_pm.c
new file mode 100644
index 0000000..364b756
--- /dev/null
+++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_pm.c
@@ -0,0 +1,206 @@ 
+/*
+* Copyright (c) 2016 MediaTek Inc.
+* Author: Tiffany Lin <[e-mail]>
+*
+* This program is free software; you can redistribute it and/or modify
+* it under the terms of the GNU General Public License version 2 as
+* published by the Free Software Foundation.
+*
+* This program is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+* GNU General Public License for more details.
+*/
+
+#include <linux/clk.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <linux/pm_runtime.h>
+#include <soc/mediatek/smi.h>
+
+#include "mtk_vcodec_dec_pm.h"
+#include "mtk_vcodec_util.h"
+#include "mtk_vpu.h"
+
+int mtk_vcodec_init_dec_pm(struct mtk_vcodec_dev *mtkdev)
+{
+	struct device_node *node;
+	struct platform_device *pdev;
+	struct device *dev;
+	struct mtk_vcodec_pm *pm;
+	int ret = 0;
+
+	pdev = mtkdev->plat_dev;
+	pm = &mtkdev->pm;
+	pm->mtkdev = mtkdev;
+	dev = &pdev->dev;
+	node = of_parse_phandle(pdev->dev.of_node, "mediatek,larb", 0);
+	if (!node) {
+		mtk_v4l2_err("of_parse_phandle mediatek,larb fail!");
+		return -1;
+	}
+
+	pdev = of_find_device_by_node(node);
+	if (WARN_ON(!pdev)) {
+		of_node_put(node);
+		return -1;
+	}
+	pm->larbvdec = &pdev->dev;
+
+	pdev = mtkdev->plat_dev;
+	pm->dev = &pdev->dev;
+
+	pm->vcodecpll = devm_clk_get(&pdev->dev, "vcodecpll");
+	if (pm->vcodecpll == NULL) {
+		mtk_v4l2_err("devm_clk_get vcodecpll fail");
+		ret = -1;
+	}
+
+	pm->univpll_d2 = devm_clk_get(&pdev->dev, "univpll_d2");
+	if (pm->univpll_d2 == NULL) {
+		mtk_v4l2_err("devm_clk_get univpll_d2 fail");
+		ret = -1;
+	}
+
+	pm->clk_cci400_sel = devm_clk_get(&pdev->dev, "clk_cci400_sel");
+	if (pm->clk_cci400_sel == NULL) {
+		mtk_v4l2_err("devm_clk_get clk_cci400_sel fail");
+		ret = -1;
+	}
+
+	pm->vdec_sel = devm_clk_get(&pdev->dev, "vdec_sel");
+	if (pm->vdec_sel == NULL) {
+		mtk_v4l2_err("devm_clk_get vdec_sel fail");
+		ret = -1;
+	}
+
+	pm->vdecpll = devm_clk_get(&pdev->dev, "vdecpll");
+	if (pm->vdecpll == NULL) {
+		mtk_v4l2_err("devm_clk_get vdecpll fail");
+		ret = -1;
+	}
+
+	pm->vencpll = devm_clk_get(&pdev->dev, "vencpll");
+	if (pm->vencpll == NULL) {
+		mtk_v4l2_err("devm_clk_get vencpll fail");
+		ret = -1;
+	}
+
+	pm->venc_lt_sel = devm_clk_get(&pdev->dev, "venc_lt_sel");
+	if (pm->venc_lt_sel == NULL) {
+		mtk_v4l2_err("devm_clk_get venc_lt_sel fail");
+		ret = -1;
+	}
+
+	pm->vdec_bus_clk_src = devm_clk_get(&pdev->dev, "vdec_bus_clk_src");
+	if (pm->vdec_bus_clk_src == NULL) {
+		mtk_v4l2_err("devm_clk_get vdec_bus_clk_src");
+		ret = -1;
+	}
+
+	pm_runtime_enable(&pdev->dev);
+
+	return ret;
+}
+
+void mtk_vcodec_release_dec_pm(struct mtk_vcodec_dev *dev)
+{
+	pm_runtime_disable(dev->pm.dev);
+}
+
+void mtk_vcodec_dec_pw_on(struct mtk_vcodec_pm *pm)
+{
+	int ret;
+
+	ret = pm_runtime_get_sync(pm->dev);
+	if (ret)
+		mtk_v4l2_err("pm_runtime_get_sync fail %d", ret);
+}
+
+void mtk_vcodec_dec_pw_off(struct mtk_vcodec_pm *pm)
+{
+	int ret;
+
+	ret = pm_runtime_put_sync(pm->dev);
+	if (ret)
+		mtk_v4l2_err("pm_runtime_put_sync fail %d", ret);
+}
+
+void mtk_vcodec_dec_clock_on(struct mtk_vcodec_pm *pm)
+{
+	int ret;
+
+	ret = clk_set_rate(pm->vcodecpll, 1482 * 1000000);
+	if (ret)
+		mtk_v4l2_err("clk_set_rate vcodecpll fail %d", ret);
+
+	ret = clk_set_rate(pm->vencpll, 800 * 1000000);
+	if (ret)
+		mtk_v4l2_err("clk_set_rate vencpll fail %d", ret);
+
+	ret = clk_prepare_enable(pm->vcodecpll);
+	if (ret)
+		mtk_v4l2_err("clk_prepare_enable vcodecpll fail %d", ret);
+
+	ret = clk_prepare_enable(pm->vencpll);
+	if (ret)
+		mtk_v4l2_err("clk_prepare_enable vencpll fail %d", ret);
+
+	ret = clk_prepare_enable(pm->vdec_bus_clk_src);
+	if (ret)
+		mtk_v4l2_err("clk_prepare_enable vdec_bus_clk_src fail %d",
+				ret);
+
+	ret = clk_prepare_enable(pm->venc_lt_sel);
+	if (ret)
+		mtk_v4l2_err("clk_prepare_enable venc_lt_sel fail %d", ret);
+
+	ret = clk_set_parent(pm->venc_lt_sel, pm->vdec_bus_clk_src);
+	if (ret)
+		mtk_v4l2_err("clk_set_parent venc_lt_sel vdec_bus_clk_src fail %d",
+				ret);
+
+	ret = clk_prepare_enable(pm->univpll_d2);
+	if (ret)
+		mtk_v4l2_err("clk_prepare_enable univpll_d2 fail %d", ret);
+
+	ret = clk_prepare_enable(pm->clk_cci400_sel);
+	if (ret)
+		mtk_v4l2_err("clk_prepare_enable clk_cci400_sel fail %d", ret);
+
+	ret = clk_set_parent(pm->clk_cci400_sel, pm->univpll_d2);
+	if (ret)
+		mtk_v4l2_err("clk_set_parent clk_cci400_sel univpll_d2 fail %d",
+				ret);
+
+	ret = clk_prepare_enable(pm->vdecpll);
+	if (ret)
+		mtk_v4l2_err("clk_prepare_enable vdecpll fail %d", ret);
+
+	ret = clk_prepare_enable(pm->vdec_sel);
+	if (ret)
+		mtk_v4l2_err("clk_prepare_enable vdec_sel fail %d", ret);
+
+	ret = clk_set_parent(pm->vdec_sel, pm->vdecpll);
+	if (ret)
+		mtk_v4l2_err("clk_set_parent vdec_sel vdecpll fail %d", ret);
+
+	ret = mtk_smi_larb_get(pm->larbvdec);
+	if (ret)
+		mtk_v4l2_err("mtk_smi_larb_get larbvdec fail %d", ret);
+
+}
+
+void mtk_vcodec_dec_clock_off(struct mtk_vcodec_pm *pm)
+{
+	mtk_smi_larb_put(pm->larbvdec);
+	clk_disable_unprepare(pm->vdec_sel);
+	clk_disable_unprepare(pm->vdecpll);
+	clk_disable_unprepare(pm->univpll_d2);
+	clk_disable_unprepare(pm->clk_cci400_sel);
+	clk_disable_unprepare(pm->venc_lt_sel);
+	clk_disable_unprepare(pm->vdec_bus_clk_src);
+	clk_disable_unprepare(pm->vencpll);
+	clk_disable_unprepare(pm->vcodecpll);
+}
+
diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_pm.h b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_pm.h
new file mode 100644
index 0000000..b8bf56f
--- /dev/null
+++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_pm.h
@@ -0,0 +1,28 @@ 
+/*
+* Copyright (c) 2016 MediaTek Inc.
+* Author: Tiffany Lin <[e-mail]>
+*
+* This program is free software; you can redistribute it and/or modify
+* it under the terms of the GNU General Public License version 2 as
+* published by the Free Software Foundation.
+*
+* This program is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+* GNU General Public License for more details.
+*/
+
+#ifndef _MTK_VCODEC_DEC_PM_H_
+#define _MTK_VCODEC_DEC_PM_H_
+
+#include "mtk_vcodec_drv.h"
+
+int mtk_vcodec_init_dec_pm(struct mtk_vcodec_dev *dev);
+void mtk_vcodec_release_dec_pm(struct mtk_vcodec_dev *dev);
+
+void mtk_vcodec_dec_pw_on(struct mtk_vcodec_pm *pm);
+void mtk_vcodec_dec_pw_off(struct mtk_vcodec_pm *pm);
+void mtk_vcodec_dec_clock_on(struct mtk_vcodec_pm *pm);
+void mtk_vcodec_dec_clock_off(struct mtk_vcodec_pm *pm);
+
+#endif /* _MTK_VCODEC_DEC_PM_H_ */
diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_drv.h b/drivers/media/platform/mtk-vcodec/mtk_vcodec_drv.h
index 78eee50..a11dfec 100644
--- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_drv.h
+++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_drv.h
@@ -26,10 +26,10 @@ 
 #include "mtk_vcodec_util.h"
 
 #define MTK_VCODEC_DRV_NAME	"mtk_vcodec_drv"
+#define MTK_VCODEC_DEC_NAME	"mtk-vcodec-dec"
 #define MTK_VCODEC_ENC_NAME	"mtk-vcodec-enc"
 #define MTK_PLATFORM_STR	"platform:mt8173"
 
-
 #define MTK_VCODEC_MAX_PLANES	3
 #define MTK_V4L2_BENCHMARK	0
 #define WAIT_INTR_TIMEOUT_MS	1000
@@ -180,6 +180,9 @@  struct mtk_enc_params {
  * struct mtk_vcodec_pm - Power management data structure
  */
 struct mtk_vcodec_pm {
+	struct clk	*vdec_bus_clk_src;
+	struct clk	*vencpll;
+
 	struct clk	*vcodecpll;
 	struct clk	*univpll_d2;
 	struct clk	*clk_cci400_sel;
@@ -197,6 +200,32 @@  struct mtk_vcodec_pm {
 };
 
 /**
+ * struct vdec_pic_info  - picture size information
+ * @pic_w: picture width
+ * @pic_h: picture height
+ * @buf_w: picture buffer width (64 aligned up from pic_w)
+ * @buf_h: picture buffer heiht (64 aligned up from pic_h)
+ * @y_bs_sz: Y bitstream size
+ * @c_bs_sz: CbCr bitstream size
+ * @y_len_sz: additional size required to store decompress information for y
+ *		plane
+ * @c_len_sz: additional size required to store decompress information for cbcr
+ *		plane
+ * E.g. suppose picture size is 176x144,
+ *      buffer size will be aligned to 176x160.
+ */
+struct vdec_pic_info {
+	unsigned int pic_w;
+	unsigned int pic_h;
+	unsigned int buf_w;
+	unsigned int buf_h;
+	unsigned int y_bs_sz;
+	unsigned int c_bs_sz;
+	unsigned int y_len_sz;
+	unsigned int c_len_sz;
+};
+
+/**
  * struct mtk_vcodec_ctx - Context (instance) private data.
  *
  * @type: type of the instance - decoder or encoder
@@ -210,9 +239,12 @@  struct mtk_vcodec_pm {
  * @state: state of the context
  * @param_change: indicate encode parameter type
  * @enc_params: encoding parameters
- * @enc_if: hoooked encoder driver interface
+ * @dec_if: hooked decoder driver interface
+ * @enc_if: hooked encoder driver interface
  * @drv_handle: driver handle for specific decode/encode instance
  *
+ * @picinfo: store picture info after header parsing
+ * @dpb_size: store dpb count after header parsing
  * @int_cond: variable used by the waitqueue
  * @int_type: type of the last interrupt
  * @queue: waitqueue that can be used to wait for this context to
@@ -220,12 +252,16 @@  struct mtk_vcodec_pm {
  * @irq_status: irq status
  *
  * @ctrl_hdl: handler for v4l2 framework
+ * @decode_work: worker for the decoding
  * @encode_work: worker for the encoding
+ * @last_decoded_picinfo: pic information get from latest decode
  *
  * @colorspace: enum v4l2_colorspace; supplemental to pixelformat
  * @ycbcr_enc: enum v4l2_ycbcr_encoding, Y'CbCr encoding
  * @quantization: enum v4l2_quantization, colorspace quantization
  * @xfer_func: enum v4l2_xfer_func, colorspace transfer function
+ * @lock: protect variables accessed by V4L2 threads and worker thread such as
+ *	  mtk_video_dec_buf.
  */
 struct mtk_vcodec_ctx {
 	enum mtk_instance_type type;
@@ -240,21 +276,31 @@  struct mtk_vcodec_ctx {
 	enum mtk_encode_param param_change;
 	struct mtk_enc_params enc_params;
 
+	struct vdec_common_if *dec_if;
 	struct venc_common_if *enc_if;
 	unsigned long drv_handle;
 
+	struct vdec_pic_info picinfo;
+	int dpb_size;
+
 	int int_cond;
 	int int_type;
 	wait_queue_head_t queue;
 	unsigned int irq_status;
 
 	struct v4l2_ctrl_handler ctrl_hdl;
+	struct work_struct decode_work;
 	struct work_struct encode_work;
+	struct vdec_pic_info last_decoded_picinfo;
 
 	enum v4l2_colorspace colorspace;
 	enum v4l2_ycbcr_encoding ycbcr_enc;
 	enum v4l2_quantization quantization;
 	enum v4l2_xfer_func xfer_func;
+
+	int decoded_frame_cnt;
+	struct mutex lock;
+
 };
 
 /**
@@ -268,25 +314,48 @@  struct mtk_vcodec_ctx {
  * @alloc_ctx: VB2 allocator context
  *	       (for allocations without kernel mapping).
  * @ctx_list: list of struct mtk_vcodec_ctx
- * @irqlock: protect data access by irq handler and work thread
- * @curr_ctx: The context that is waiting for codec hardware
+ * @irqlock: protect data access by irq handler and work thread -- curr_ctx
+ * @curr_ctx: The context that is waiting for codec hardware. Protected by
+ *		irqlock and dec_mutex or enc_mutex.
  *
  * @reg_base: Mapped address of MTK Vcodec registers.
  *
- * @id_counter: used to identify current opened instance
+ * @id_counter:  An integer id given to the next opened instance
  * @num_instances: counter of active MTK Vcodec instances
  *
  * @encode_workqueue: encode work queue
  *
+ * @v4l2_dev: V4L2 device to register video devices for.
+ * @vfd_dec: Video device for decoder
+ * @vfd_enc: Video device for encoder
+ *
+ * @m2m_dev_dec: m2m device for decoder
+ * @m2m_dev_enc: m2m device for encoder
+ * @plat_dev: platform device
+ * @vpu_plat_dev: mtk vpu platform device
+ * @alloc_ctx:VB2 allocator context
+ *	      (for allocations without kernel mapping).
+ * @ctx_list: list of struct mtk_vcodec_ctx
+ * @irqlock: protect data access by irq handler and work thread
+ * @curr_ctx: The context that is waiting for codec hardware
+ * @reg_base: Mapped address of MTK Vcodec registers.
+ *
+ * @instance_mask: used to mark which index id are used
+ * @num_instances: counter of active MTK Vcodec instances
+ *
+ * @decode_workqueue: decode work queue
+ * @encode_workqueue: encode work queue
  * @int_cond: used to identify interrupt condition happen
  * @int_type: used to identify what kind of interrupt condition happen
  * @dev_mutex: video_device lock
  * @queue: waitqueue for waiting for completion of device commands
  *
+ * @dec_irq: decoder irq resource
  * @enc_irq: h264 encoder irq resource
- * @enc_lt_irq: vp8 encoder irq resource
+ * @enc_lt_irq: vp8 encoder lt irq resource
  *
- * @enc_mutex: encoder hardware lock.
+ * @dec_mutex: decoder hardware lock
+ * @enc_mutex: encoder hardware lock
  *
  * @pm: power management control
  * @dec_capability: used to identify decode capability, ex: 4k
@@ -294,8 +363,10 @@  struct mtk_vcodec_ctx {
  */
 struct mtk_vcodec_dev {
 	struct v4l2_device v4l2_dev;
+	struct video_device *vfd_dec;
 	struct video_device *vfd_enc;
 
+	struct v4l2_m2m_dev *m2m_dev_dec;
 	struct v4l2_m2m_dev *m2m_dev_enc;
 	struct platform_device *plat_dev;
 	struct platform_device *vpu_plat_dev;
@@ -308,6 +379,7 @@  struct mtk_vcodec_dev {
 	unsigned long id_counter;
 	int num_instances;
 
+	struct workqueue_struct *decode_workqueue;
 	struct workqueue_struct *encode_workqueue;
 
 	int int_cond;
@@ -315,9 +387,11 @@  struct mtk_vcodec_dev {
 	struct mutex dev_mutex;
 	wait_queue_head_t queue;
 
+	int dec_irq;
 	int enc_irq;
 	int enc_lt_irq;
 
+	struct mutex dec_mutex;
 	struct mutex enc_mutex;
 
 	struct mtk_vcodec_pm pm;
diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_intr.c b/drivers/media/platform/mtk-vcodec/mtk_vcodec_intr.c
index 52e7e5c..f0bdb19 100644
--- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_intr.c
+++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_intr.c
@@ -30,8 +30,7 @@  int mtk_vcodec_wait_for_done_ctx(struct mtk_vcodec_ctx  *ctx, int command,
 	timeout_jiff = msecs_to_jiffies(timeout_ms);
 
 	ret = wait_event_interruptible_timeout(*waitqueue,
-				(ctx->int_cond &&
-				(ctx->int_type == command)),
+				ctx->int_cond,
 				timeout_jiff);
 
 	if (!ret) {
@@ -52,3 +51,4 @@  int mtk_vcodec_wait_for_done_ctx(struct mtk_vcodec_ctx  *ctx, int command,
 	return status;
 }
 EXPORT_SYMBOL(mtk_vcodec_wait_for_done_ctx);
+
diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_intr.h b/drivers/media/platform/mtk-vcodec/mtk_vcodec_intr.h
index 33e890f..fbb8b1e 100644
--- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_intr.h
+++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_intr.h
@@ -16,7 +16,7 @@ 
 #define _MTK_VCODEC_INTR_H_
 
 #define MTK_INST_IRQ_RECEIVED		0x1
-#define MTK_INST_WORK_THREAD_ABORT_DONE	0x2
+
 
 struct mtk_vcodec_ctx;
 
diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_util.c b/drivers/media/platform/mtk-vcodec/mtk_vcodec_util.c
index 5e36513..7617305 100644
--- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_util.c
+++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_util.c
@@ -81,14 +81,35 @@  void mtk_vcodec_mem_free(struct mtk_vcodec_ctx *data,
 		return;
 	}
 
-	dma_free_coherent(dev, size, mem->va, mem->dma_addr);
-	mem->va = NULL;
-	mem->dma_addr = 0;
-	mem->size = 0;
-
 	mtk_v4l2_debug(3, "[%d]  - va      = %p", ctx->id, mem->va);
 	mtk_v4l2_debug(3, "[%d]  - dma     = 0x%lx", ctx->id,
 		       (unsigned long)mem->dma_addr);
 	mtk_v4l2_debug(3, "[%d]    size = 0x%lx", ctx->id, size);
+
+	dma_free_coherent(dev, size, mem->va, mem->dma_addr);
+	mem->va = NULL;
+	mem->dma_addr = 0;
+	mem->size = 0;
 }
 EXPORT_SYMBOL(mtk_vcodec_mem_free);
+
+void mtk_vcodec_set_curr_ctx(struct mtk_vcodec_dev *dev,
+	struct mtk_vcodec_ctx *ctx)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&dev->irqlock, flags);
+	dev->curr_ctx = ctx;
+	spin_unlock_irqrestore(&dev->irqlock, flags);
+}
+
+struct mtk_vcodec_ctx *mtk_vcodec_get_curr_ctx(struct mtk_vcodec_dev *dev)
+{
+	unsigned long flags;
+	struct mtk_vcodec_ctx *ctx;
+
+	spin_lock_irqsave(&dev->irqlock, flags);
+	ctx = dev->curr_ctx;
+	spin_unlock_irqrestore(&dev->irqlock, flags);
+	return ctx;
+}
diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_util.h b/drivers/media/platform/mtk-vcodec/mtk_vcodec_util.h
index d6345fc..91a0b1a 100644
--- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_util.h
+++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_util.h
@@ -1,7 +1,7 @@ 
 /*
 * Copyright (c) 2016 MediaTek Inc.
 * Author: PC Chen <[e-mail]>
-*	Tiffany Lin <[e-mail]>
+*		Tiffany Lin <[e-mail]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
@@ -26,6 +26,7 @@  struct mtk_vcodec_mem {
 };
 
 struct mtk_vcodec_ctx;
+struct mtk_vcodec_dev;
 
 extern int mtk_v4l2_dbg_level;
 extern bool mtk_vcodec_dbg;
@@ -84,4 +85,8 @@  int mtk_vcodec_mem_alloc(struct mtk_vcodec_ctx *data,
 				struct mtk_vcodec_mem *mem);
 void mtk_vcodec_mem_free(struct mtk_vcodec_ctx *data,
 				struct mtk_vcodec_mem *mem);
+void mtk_vcodec_set_curr_ctx(struct mtk_vcodec_dev *dev,
+	struct mtk_vcodec_ctx *ctx);
+struct mtk_vcodec_ctx *mtk_vcodec_get_curr_ctx(struct mtk_vcodec_dev *dev);
+
 #endif /* _MTK_VCODEC_UTIL_H_ */
diff --git a/drivers/media/platform/mtk-vcodec/vdec_drv_base.h b/drivers/media/platform/mtk-vcodec/vdec_drv_base.h
new file mode 100644
index 0000000..7e4c1a9
--- /dev/null
+++ b/drivers/media/platform/mtk-vcodec/vdec_drv_base.h
@@ -0,0 +1,56 @@ 
+/*
+ * Copyright (c) 2016 MediaTek Inc.
+ * Author: PC Chen <[e-mail]>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef _VDEC_DRV_BASE_
+#define _VDEC_DRV_BASE_
+
+#include "mtk_vcodec_drv.h"
+
+#include "vdec_drv_if.h"
+
+struct vdec_common_if {
+	/**
+	 * (*init)() - initialize decode driver
+	 * @ctx     : [in] mtk v4l2 context
+	 * @h_vdec  : [out] driver handle
+	 */
+	int (*init)(struct mtk_vcodec_ctx *ctx, unsigned long *h_vdec);
+
+	/**
+	 * (*decode)() - trigger decode
+	 * @h_vdec  : [in] driver handle
+	 * @bs      : [in] input bitstream
+	 * @fb      : [in] frame buffer to store decoded frame
+	 * @res_chg : [out] resolution change happen
+	 */
+	int (*decode)(unsigned long h_vdec, struct mtk_vcodec_mem *bs,
+		      struct vdec_fb *fb, bool *res_chg);
+
+	/**
+	 * (*get_param)() - get driver's parameter
+	 * @h_vdec : [in] driver handle
+	 * @type   : [in] input parameter type
+	 * @out    : [out] buffer to store query result
+	 */
+	int (*get_param)(unsigned long h_vdec, enum vdec_get_param_type type,
+			 void *out);
+
+	/**
+	 * (*deinit)() - deinitialize driver.
+	 * @h_vdec : [in] driver handle to be deinit
+	 */
+	void (*deinit)(unsigned long h_vdec);
+};
+
+#endif
diff --git a/drivers/media/platform/mtk-vcodec/vdec_drv_if.c b/drivers/media/platform/mtk-vcodec/vdec_drv_if.c
new file mode 100644
index 0000000..8202b14
--- /dev/null
+++ b/drivers/media/platform/mtk-vcodec/vdec_drv_if.c
@@ -0,0 +1,107 @@ 
+/*
+ * Copyright (c) 2016 MediaTek Inc.
+ * Author: PC Chen <[e-mail]>
+ *         Tiffany Lin <[e-mail]>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+
+#include "vdec_drv_base.h"
+#include "vdec_drv_if.h"
+
+#include "mtk_vcodec_dec_pm.h"
+#include "mtk_vcodec_util.h"
+#include "mtk_vpu.h"
+
+int vdec_if_init(struct mtk_vcodec_ctx *ctx, unsigned int fourcc)
+{
+	int ret = 0;
+
+	switch (fourcc) {
+	case V4L2_PIX_FMT_H264:
+	case V4L2_PIX_FMT_VP8:
+	case V4L2_PIX_FMT_VP9:
+	default:
+		return -EINVAL;
+	}
+
+	mtk_vdec_lock(ctx);
+	mtk_vcodec_dec_clock_on(&ctx->dev->pm);
+	ret = ctx->dec_if->init(ctx, &ctx->drv_handle);
+	mtk_vcodec_dec_clock_off(&ctx->dev->pm);
+	mtk_vdec_unlock(ctx);
+
+	return ret;
+}
+
+int vdec_if_decode(struct mtk_vcodec_ctx *ctx, struct mtk_vcodec_mem *bs,
+		   struct vdec_fb *fb, bool *res_chg)
+{
+	int ret = 0;
+
+	if (bs) {
+		if ((bs->dma_addr & 63) != 0) {
+			mtk_v4l2_err("bs dma_addr should 64 byte align");
+			return -EINVAL;
+		}
+	}
+
+	if (fb) {
+		if (((fb->base_y.dma_addr & 511) != 0) ||
+		    ((fb->base_c.dma_addr & 511) != 0)) {
+			mtk_v4l2_err("frame buffer dma_addr should 512 byte align");
+			return -EINVAL;
+		}
+	}
+
+	mtk_vdec_lock(ctx);
+
+	mtk_vcodec_set_curr_ctx(ctx->dev, ctx);
+	mtk_vcodec_dec_clock_on(&ctx->dev->pm);
+	enable_irq(ctx->dev->dec_irq);
+	ret = ctx->dec_if->decode(ctx->drv_handle, bs, fb, res_chg);
+	disable_irq(ctx->dev->dec_irq);
+	mtk_vcodec_dec_clock_off(&ctx->dev->pm);
+	mtk_vcodec_set_curr_ctx(ctx->dev, NULL);
+
+	mtk_vdec_unlock(ctx);
+
+	return ret;
+}
+
+int vdec_if_get_param(struct mtk_vcodec_ctx *ctx, enum vdec_get_param_type type,
+		      void *out)
+{
+	int ret = 0;
+
+	mtk_vdec_lock(ctx);
+	ret = ctx->dec_if->get_param(ctx->drv_handle, type, out);
+	mtk_vdec_unlock(ctx);
+
+	return ret;
+}
+
+void vdec_if_deinit(struct mtk_vcodec_ctx *ctx)
+{
+	if (ctx->drv_handle == 0)
+		return;
+
+	mtk_vdec_lock(ctx);
+	mtk_vcodec_dec_clock_on(&ctx->dev->pm);
+	ctx->dec_if->deinit(ctx->drv_handle);
+	mtk_vcodec_dec_clock_off(&ctx->dev->pm);
+	mtk_vdec_unlock(ctx);
+
+	ctx->drv_handle = 0;
+}
diff --git a/drivers/media/platform/mtk-vcodec/vdec_drv_if.h b/drivers/media/platform/mtk-vcodec/vdec_drv_if.h
new file mode 100644
index 0000000..db6b520
--- /dev/null
+++ b/drivers/media/platform/mtk-vcodec/vdec_drv_if.h
@@ -0,0 +1,101 @@ 
+/*
+ * Copyright (c) 2016 MediaTek Inc.
+ * Author: PC Chen <[e-mail]>
+ *		   Tiffany Lin <[e-mail]>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef _VDEC_DRV_IF_H_
+#define _VDEC_DRV_IF_H_
+
+#include "mtk_vcodec_drv.h"
+#include "mtk_vcodec_dec.h"
+#include "mtk_vcodec_util.h"
+
+
+/**
+ * struct vdec_fb_status  - decoder frame buffer status
+ * @FB_ST_NORMAL	: initial state
+ * @FB_ST_DISPLAY	: frmae buffer is ready to be displayed
+ * @FB_ST_FREE		: frame buffer is not used by decoder any more
+ */
+enum vdec_fb_status {
+	FB_ST_NORMAL		= 0,
+	FB_ST_DISPLAY		= (1 << 0),
+	FB_ST_FREE		= (1 << 1)
+};
+
+/* For GET_PARAM_DISP_FRAME_BUFFER and GET_PARAM_FREE_FRAME_BUFFER,
+ * the caller does not own the returned buffer. The buffer will not be
+ *				released before vdec_if_deinit.
+ * GET_PARAM_DISP_FRAME_BUFFER	: get next displayable frame buffer,
+ *				struct vdec_fb**
+ * GET_PARAM_FREE_FRAME_BUFFER	: get non-referenced framebuffer, vdec_fb**
+ * GET_PARAM_PIC_INFO		: get picture info, struct vdec_pic_info*
+ * GET_PARAM_CROP_INFO		: get crop info, struct v4l2_crop*
+ * GET_PARAM_DPB_SIZE		: get dpb size, unsigned int*
+ */
+enum vdec_get_param_type {
+	GET_PARAM_DISP_FRAME_BUFFER,
+	GET_PARAM_FREE_FRAME_BUFFER,
+	GET_PARAM_PIC_INFO,
+	GET_PARAM_CROP_INFO,
+	GET_PARAM_DPB_SIZE
+};
+
+/**
+ * struct vdec_fb_node  - decoder frame buffer node
+ * @list	: list to hold this node
+ * @fb	: point to frame buffer (vdec_fb), fb could point to frame buffer and
+ *	working buffer this is for maintain buffers in different state
+ */
+struct vdec_fb_node {
+	struct list_head list;
+	struct vdec_fb *fb;
+};
+
+/**
+ * vdec_if_init() - initialize decode driver
+ * @ctx	: [in] v4l2 context
+ * @fourcc	: [in] video format fourcc, V4L2_PIX_FMT_H264/VP8/VP9..
+ */
+int vdec_if_init(struct mtk_vcodec_ctx *ctx, unsigned int fourcc);
+
+/**
+ * vdec_if_deinit() - deinitialize decode driver
+ * @ctx	: [in] v4l2 context
+ *
+ */
+void vdec_if_deinit(struct mtk_vcodec_ctx *ctx);
+
+/**
+ * vdec_if_decode() - trigger decode
+ * @ctx	: [in] v4l2 context
+ * @bs	: [in] input bitstream
+ * @fb	: [in] frame buffer to store decoded frame, when null menas parse
+ *	header only
+ * @res_chg	: [out] resolution change happens if current bs have different
+ *	picture width/height
+ * Note: To flush the decoder when reaching EOF, set input bitstream as NULL.
+ */
+int vdec_if_decode(struct mtk_vcodec_ctx *ctx, struct mtk_vcodec_mem *bs,
+		   struct vdec_fb *fb, bool *res_chg);
+
+/**
+ * vdec_if_get_param() - get driver's parameter
+ * @ctx	: [in] v4l2 context
+ * @type	: [in] input parameter type
+ * @out	: [out] buffer to store query result
+ */
+int vdec_if_get_param(struct mtk_vcodec_ctx *ctx, enum vdec_get_param_type type,
+		      void *out);
+
+#endif
diff --git a/drivers/media/platform/mtk-vcodec/vdec_ipi_msg.h b/drivers/media/platform/mtk-vcodec/vdec_ipi_msg.h
new file mode 100644
index 0000000..5a8a629
--- /dev/null
+++ b/drivers/media/platform/mtk-vcodec/vdec_ipi_msg.h
@@ -0,0 +1,103 @@ 
+/*
+ * Copyright (c) 2016 MediaTek Inc.
+ * Author: PC Chen <[e-mail]>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef _VDEC_IPI_MSG_H_
+#define _VDEC_IPI_MSG_H_
+
+/**
+ * enum vdec_ipi_msgid - message id between AP and VPU
+ * @AP_IPIMSG_XXX	: AP to VPU cmd message id
+ * @VPU_IPIMSG_XXX_ACK	: VPU ack AP cmd message id
+ */
+enum vdec_ipi_msgid {
+	AP_IPIMSG_DEC_INIT = 0xA000,
+	AP_IPIMSG_DEC_START = 0xA001,
+	AP_IPIMSG_DEC_END = 0xA002,
+	AP_IPIMSG_DEC_DEINIT = 0xA003,
+	AP_IPIMSG_DEC_RESET = 0xA004,
+
+	VPU_IPIMSG_DEC_INIT_ACK = 0xB000,
+	VPU_IPIMSG_DEC_START_ACK = 0xB001,
+	VPU_IPIMSG_DEC_END_ACK = 0xB002,
+	VPU_IPIMSG_DEC_DEINIT_ACK = 0xB003,
+	VPU_IPIMSG_DEC_RESET_ACK = 0xB004,
+};
+
+/**
+ * struct vdec_ap_ipi_cmd - generic AP to VPU ipi command format
+ * @msg_id	: vdec_ipi_msgid
+ * @vpu_inst_addr	: VPU decoder instance address
+ */
+struct vdec_ap_ipi_cmd {
+	uint32_t msg_id;
+	uint32_t vpu_inst_addr;
+};
+
+/**
+ * struct vdec_vpu_ipi_ack - generic VPU to AP ipi command format
+ * @msg_id	: vdec_ipi_msgid
+ * @status	: VPU exeuction result
+ * @ap_inst_addr	: AP video decoder instance address
+ */
+struct vdec_vpu_ipi_ack {
+	uint32_t msg_id;
+	int32_t status;
+	uint64_t ap_inst_addr;
+};
+
+/**
+ * struct vdec_ap_ipi_init - for AP_IPIMSG_DEC_INIT
+ * @msg_id	: AP_IPIMSG_DEC_INIT
+ * @reserved	: Reserved field
+ * @ap_inst_addr	: AP video decoder instance address
+ */
+struct vdec_ap_ipi_init {
+	uint32_t msg_id;
+	uint32_t reserved;
+	uint64_t ap_inst_addr;
+};
+
+/**
+ * struct vdec_ap_ipi_dec_start - for AP_IPIMSG_DEC_START
+ * @msg_id	: AP_IPIMSG_DEC_START
+ * @vpu_inst_addr	: VPU decoder instance address
+ * @data	: Header info
+ *	H264 decoder [0]:buf_sz [1]:nal_start
+ *	VP8 decoder  [0]:width/height
+ *	VP9 decoder  [0]:profile, [1][2] width/height
+ * @reserved	: Reserved field
+ */
+struct vdec_ap_ipi_dec_start {
+	uint32_t msg_id;
+	uint32_t vpu_inst_addr;
+	uint32_t data[3];
+	uint32_t reserved;
+};
+
+/**
+ * struct vdec_vpu_ipi_init_ack - for VPU_IPIMSG_DEC_INIT_ACK
+ * @msg_id	: VPU_IPIMSG_DEC_INIT_ACK
+ * @status	: VPU exeuction result
+ * @ap_inst_addr	: AP vcodec_vpu_inst instance address
+ * @vpu_inst_addr	: VPU decoder instance address
+ */
+struct vdec_vpu_ipi_init_ack {
+	uint32_t msg_id;
+	int32_t status;
+	uint64_t ap_inst_addr;
+	uint32_t vpu_inst_addr;
+};
+
+#endif