From patchwork Wed Jan 11 06:51:10 2017
Content-Type: text/plain; charset="utf-8"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
X-Patchwork-Submitter: YT Shen <yt.shen@mediatek.com>
X-Patchwork-Id: 9509461
Return-Path: 
 <linux-mediatek-bounces+patchwork-linux-mediatek=patchwork.kernel.org@lists.infradead.org>
Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org
	[172.30.200.125])
	by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id
	310D560710 for <patchwork-linux-mediatek@patchwork.kernel.org>;
	Wed, 11 Jan 2017 07:55:31 +0000 (UTC)
Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1])
	by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 224642851D
	for <patchwork-linux-mediatek@patchwork.kernel.org>;
	Wed, 11 Jan 2017 07:55:31 +0000 (UTC)
Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486)
	id 171E9285A8; Wed, 11 Jan 2017 07:55:31 +0000 (UTC)
X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on
	pdx-wl-mail.web.codeaurora.org
X-Spam-Level: 
X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED,
	UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1
Received: from bombadil.infradead.org (bombadil.infradead.org
	[198.137.202.9])
	(using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits))
	(No client certificate requested)
	by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 73E752851D
	for <patchwork-linux-mediatek@patchwork.kernel.org>;
	Wed, 11 Jan 2017 07:55:30 +0000 (UTC)
Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org)
	by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux))
	id 1cRDko-0004N2-6H; Wed, 11 Jan 2017 07:55:30 +0000
Received: from merlin.infradead.org ([2001:4978:20e::2])
	by bombadil.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux))
	id 1cRDkb-00045x-Ak; Wed, 11 Jan 2017 07:55:17 +0000
Received: from [210.61.82.183] (helo=mailgw01.mediatek.com)
	by merlin.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux))
	id 1cRCnH-0003R8-NJ; Wed, 11 Jan 2017 06:54:01 +0000
Received: from mtkhts07.mediatek.inc [(172.21.101.69)] by
	mailgw01.mediatek.com (envelope-from <yt.shen@mediatek.com>)
	(mhqrelay.mediatek.com ESMTP with TLS)
	with ESMTP id 768715902; Wed, 11 Jan 2017 14:53:30 +0800
Received: from mtkslt301.mediatek.inc (10.21.14.114) by mtkhts07.mediatek.inc
	(172.21.101.73) with Microsoft SMTP Server id 14.3.266.1;
	Wed, 11 Jan 2017 14:53:29 +0800
From: YT Shen <yt.shen@mediatek.com>
To: <dri-devel@lists.freedesktop.org>, Philipp Zabel <p.zabel@pengutronix.de>,
	CK Hu <ck.hu@mediatek.com>
Subject: [PATCH v11 09/12] drm/mediatek: add dsi transfer function
Date: Wed, 11 Jan 2017 14:51:10 +0800
Message-ID: <1484117473-46644-10-git-send-email-yt.shen@mediatek.com>
X-Mailer: git-send-email 1.9.1
In-Reply-To: <1484117473-46644-1-git-send-email-yt.shen@mediatek.com>
References: <1484117473-46644-1-git-send-email-yt.shen@mediatek.com>
MIME-Version: 1.0
X-MTK: N
X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 
X-CRM114-CacheID: sfid-20170111_015401_164117_FD0667A6 
X-CRM114-Status: GOOD (  23.59  )
X-BeenThere: linux-mediatek@lists.infradead.org
X-Mailman-Version: 2.1.21
Precedence: list
List-Id: <linux-mediatek.lists.infradead.org>
List-Unsubscribe: <http://lists.infradead.org/mailman/options/linux-mediatek>,
	<mailto:linux-mediatek-request@lists.infradead.org?subject=unsubscribe>
List-Archive: <http://lists.infradead.org/pipermail/linux-mediatek/>
List-Post: <mailto:linux-mediatek@lists.infradead.org>
List-Help: <mailto:linux-mediatek-request@lists.infradead.org?subject=help>
List-Subscribe: <http://lists.infradead.org/mailman/listinfo/linux-mediatek>,
	<mailto:linux-mediatek-request@lists.infradead.org?subject=subscribe>
Cc: Mark Rutland <mark.rutland@arm.com>, devicetree@vger.kernel.org,
	srv_heupstream@mediatek.com, David Airlie <airlied@linux.ie>,
	thierry.reding@gmail.com, emil.l.velikov@gmail.com,
	linux-kernel@vger.kernel.org, Rob Herring <robh+dt@kernel.org>,
	linux-mediatek@lists.infradead.org,
	Matthias Brugger <matthias.bgg@gmail.com>,
	yingjoe.chen@mediatek.com, shaoming chen <shaoming.chen@mediatek.com>,
	linux-arm-kernel@lists.infradead.org
Sender: "Linux-mediatek" <linux-mediatek-bounces@lists.infradead.org>
Errors-To: 
 linux-mediatek-bounces+patchwork-linux-mediatek=patchwork.kernel.org@lists.infradead.org
X-Virus-Scanned: ClamAV using ClamSMTP

From: shaoming chen <shaoming.chen@mediatek.com>

add dsi read/write commands for transfer function

Signed-off-by: shaoming chen <shaoming.chen@mediatek.com>
Acked-by: CK Hu <ck.hu@mediatek.com>
---
 drivers/gpu/drm/mediatek/mtk_dsi.c | 168 ++++++++++++++++++++++++++++++++++++-
 1 file changed, 166 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
index 474861a..b3c7fd8 100644
--- a/drivers/gpu/drm/mediatek/mtk_dsi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
@@ -24,6 +24,7 @@
 #include <linux/of_graph.h>
 #include <linux/phy/phy.h>
 #include <linux/platform_device.h>
+#include <video/mipi_display.h>
 #include <video/videomode.h>
 
 #include "mtk_drm_ddp_comp.h"
@@ -80,8 +81,16 @@
 #define DSI_HBP_WC		0x54
 #define DSI_HFP_WC		0x58
 
+#define DSI_CMDQ_SIZE		0x60
+#define CMDQ_SIZE			0x3f
+
 #define DSI_HSTX_CKL_WC		0x64
 
+#define DSI_RX_DATA0		0x74
+#define DSI_RX_DATA1		0x78
+#define DSI_RX_DATA2		0x7c
+#define DSI_RX_DATA3		0x80
+
 #define DSI_RACK		0x84
 #define RACK				BIT(0)
 
@@ -117,6 +126,15 @@
 #define CLK_HS_POST			(0xff << 8)
 #define CLK_HS_EXIT			(0xff << 16)
 
+#define DSI_CMDQ0		0x180
+#define CONFIG				(0xff << 0)
+#define SHORT_PACKET			0
+#define LONG_PACKET			2
+#define BTA				BIT(2)
+#define DATA_ID				(0xff << 8)
+#define DATA_0				(0xff << 16)
+#define DATA_1				(0xff << 24)
+
 #define T_LPX		5
 #define T_HS_PREP	6
 #define T_HS_TRAIL	8
@@ -125,6 +143,12 @@
 
 #define NS_TO_CYCLE(n, c)    ((n) / (c) + (((n) % (c)) ? 1 : 0))
 
+#define MTK_DSI_HOST_IS_READ(type) \
+	((type == MIPI_DSI_GENERIC_READ_REQUEST_0_PARAM) || \
+	(type == MIPI_DSI_GENERIC_READ_REQUEST_1_PARAM) || \
+	(type == MIPI_DSI_GENERIC_READ_REQUEST_2_PARAM) || \
+	(type == MIPI_DSI_DCS_READ))
+
 struct phy;
 
 struct mtk_dsi {
@@ -497,12 +521,12 @@ static void mtk_dsi_irq_data_set(struct mtk_dsi *dsi, u32 irq_bit)
 	dsi->irq_data |= irq_bit;
 }
 
-static __maybe_unused void mtk_dsi_irq_data_clear(struct mtk_dsi *dsi, u32 irq_bit)
+static void mtk_dsi_irq_data_clear(struct mtk_dsi *dsi, u32 irq_bit)
 {
 	dsi->irq_data &= ~irq_bit;
 }
 
-static __maybe_unused s32 mtk_dsi_wait_for_irq_done(struct mtk_dsi *dsi, u32 irq_flag,
+static s32 mtk_dsi_wait_for_irq_done(struct mtk_dsi *dsi, u32 irq_flag,
 				     unsigned int timeout)
 {
 	s32 ret = 0;
@@ -832,9 +856,149 @@ static int mtk_dsi_host_detach(struct mipi_dsi_host *host,
 	return 0;
 }
 
+static void mtk_dsi_wait_for_idle(struct mtk_dsi *dsi)
+{
+	u32 timeout_ms = 500000; /* total 1s ~ 2s timeout */
+
+	while (timeout_ms--) {
+		if (!(readl(dsi->regs + DSI_INTSTA) & DSI_BUSY))
+			break;
+
+		usleep_range(2, 4);
+	}
+
+	if (timeout_ms == 0) {
+		DRM_WARN("polling dsi wait not busy timeout!\n");
+
+		mtk_dsi_enable(dsi);
+		mtk_dsi_reset_engine(dsi);
+	}
+}
+
+static u32 mtk_dsi_recv_cnt(u8 type, u8 *read_data)
+{
+	switch (type) {
+	case MIPI_DSI_RX_GENERIC_SHORT_READ_RESPONSE_1BYTE:
+	case MIPI_DSI_RX_DCS_SHORT_READ_RESPONSE_1BYTE:
+		return 1;
+	case MIPI_DSI_RX_GENERIC_SHORT_READ_RESPONSE_2BYTE:
+	case MIPI_DSI_RX_DCS_SHORT_READ_RESPONSE_2BYTE:
+		return 2;
+	case MIPI_DSI_RX_GENERIC_LONG_READ_RESPONSE:
+	case MIPI_DSI_RX_DCS_LONG_READ_RESPONSE:
+		return read_data[1] + read_data[2] * 16;
+	case MIPI_DSI_RX_ACKNOWLEDGE_AND_ERROR_REPORT:
+		DRM_INFO("type is 0x02, try again\n");
+		break;
+	default:
+		DRM_INFO("type(0x%x) cannot be non-recognite\n", type);
+		break;
+	}
+
+	return 0;
+}
+
+static void mtk_dsi_cmdq(struct mtk_dsi *dsi, const struct mipi_dsi_msg *msg)
+{
+	const char *tx_buf = msg->tx_buf;
+	u8 config, cmdq_size, cmdq_off, type = msg->type;
+	u32 reg_val, cmdq_mask, i;
+
+	if (MTK_DSI_HOST_IS_READ(type))
+		config = BTA;
+	else
+		config = (msg->tx_len > 2) ? LONG_PACKET : SHORT_PACKET;
+
+	if (msg->tx_len > 2) {
+		cmdq_size = 1 + (msg->tx_len + 3) / 4;
+		cmdq_off = 4;
+		cmdq_mask = CONFIG | DATA_ID | DATA_0 | DATA_1;
+		reg_val = (msg->tx_len << 16) | (type << 8) | config;
+	} else {
+		cmdq_size = 1;
+		cmdq_off = 2;
+		cmdq_mask = CONFIG | DATA_ID;
+		reg_val = (type << 8) | config;
+	}
+
+	for (i = 0; i < msg->tx_len; i++)
+		writeb(tx_buf[i], dsi->regs + DSI_CMDQ0 + cmdq_off + i);
+
+	mtk_dsi_mask(dsi, DSI_CMDQ0, cmdq_mask, reg_val);
+	mtk_dsi_mask(dsi, DSI_CMDQ_SIZE, CMDQ_SIZE, cmdq_size);
+}
+
+static ssize_t mtk_dsi_host_send_cmd(struct mtk_dsi *dsi,
+				     const struct mipi_dsi_msg *msg, u8 flag)
+{
+	mtk_dsi_wait_for_idle(dsi);
+	mtk_dsi_irq_data_clear(dsi, flag);
+	mtk_dsi_cmdq(dsi, msg);
+	mtk_dsi_start(dsi);
+
+	if (!mtk_dsi_wait_for_irq_done(dsi, flag, 2000))
+		return -ETIME;
+	else
+		return 0;
+}
+
+static ssize_t mtk_dsi_host_transfer(struct mipi_dsi_host *host,
+				     const struct mipi_dsi_msg *msg)
+{
+	struct mtk_dsi *dsi = host_to_dsi(host);
+	u32 recv_cnt, i;
+	u8 read_data[16];
+	void *src_addr;
+	u8 irq_flag = CMD_DONE_INT_FLAG;
+
+	if (readl(dsi->regs + DSI_MODE_CTRL) & MODE) {
+		DRM_ERROR("dsi engine is not command mode\n");
+		return -EINVAL;
+	}
+
+	if (MTK_DSI_HOST_IS_READ(msg->type))
+		irq_flag |= LPRX_RD_RDY_INT_FLAG;
+
+	if (mtk_dsi_host_send_cmd(dsi, msg, irq_flag) < 0)
+		return -ETIME;
+
+	if (!MTK_DSI_HOST_IS_READ(msg->type))
+		return 0;
+
+	if (!msg->rx_buf) {
+		DRM_ERROR("dsi receive buffer size may be NULL\n");
+		return -EINVAL;
+	}
+
+	for (i = 0; i < 16; i++)
+		*(read_data + i) = readb(dsi->regs + DSI_RX_DATA0 + i);
+
+	recv_cnt = mtk_dsi_recv_cnt(read_data[0], read_data);
+
+	if (recv_cnt > 2)
+		src_addr = &read_data[4];
+	else
+		src_addr = &read_data[1];
+
+	if (recv_cnt > 10)
+		recv_cnt = 10;
+
+	if (recv_cnt > msg->rx_len)
+		recv_cnt = msg->rx_len;
+
+	if (recv_cnt)
+		memcpy(msg->rx_buf, src_addr, recv_cnt);
+
+	DRM_INFO("dsi get %d byte data from the panel address(0x%x)\n",
+		 recv_cnt, *((u8 *)(msg->tx_buf)));
+
+	return recv_cnt;
+}
+
 static const struct mipi_dsi_host_ops mtk_dsi_ops = {
 	.attach = mtk_dsi_host_attach,
 	.detach = mtk_dsi_host_detach,
+	.transfer = mtk_dsi_host_transfer,
 };
 
 static int mtk_dsi_bind(struct device *dev, struct device *master, void *data)