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From: Meng Yi <meng.yi@nxp.com>
To: <stefan@agner.ch>, <jianwei.wang.chn@gmail.com>,
	<dri-devel@lists.freedesktop.org>
Subject: [PATCH v3 1/3] drm/layerscape: Add sii9022a driver
Date: Wed, 9 Mar 2016 16:31:00 +0800
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The SiI9022A is an ultra low-power HDMI transmitter. It supports
resolutions from standard definition 480i/p and 576i/p all the way
to high-definition 720p, 1080i, and 1080p, the highest resolution
supported 4K today. It also supports all PC resolutions up
to UXGA for netbooks

Signed-off-by: Meng Yi <meng.yi@nxp.com>
Signed-off-by: Alison Wang <alison.wang@nxp.com>
Signed-off-by: Xiubo Li <lixiubo@cmss.chinamobile.com>
Signed-off-by: Jianwei Wang <jianwei.wang.chn@gmail.com>
---
 drivers/gpu/drm/i2c/Kconfig       |   6 +
 drivers/gpu/drm/i2c/Makefile      |   3 +
 drivers/gpu/drm/i2c/sii9022_drv.c | 449 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 458 insertions(+)
 create mode 100644 drivers/gpu/drm/i2c/sii9022_drv.c

diff --git a/drivers/gpu/drm/i2c/Kconfig b/drivers/gpu/drm/i2c/Kconfig
index 22c7ed6..8646729 100644
--- a/drivers/gpu/drm/i2c/Kconfig
+++ b/drivers/gpu/drm/i2c/Kconfig
@@ -31,4 +31,10 @@ config DRM_I2C_NXP_TDA998X
 	help
 	  Support for NXP Semiconductors TDA998X HDMI encoders.
 
+config DRM_I2C_SII9022
+	tristate "Silicon Image sii9022 TMDS transmitter"
+	help
+	  Support for sii9022 and similar single-link (or dual-link
+	  when used in pairs) TMDS transmitters.
+
 endmenu
diff --git a/drivers/gpu/drm/i2c/Makefile b/drivers/gpu/drm/i2c/Makefile
index 2c72eb5..cf2e8b9 100644
--- a/drivers/gpu/drm/i2c/Makefile
+++ b/drivers/gpu/drm/i2c/Makefile
@@ -10,3 +10,6 @@ obj-$(CONFIG_DRM_I2C_SIL164) += sil164.o
 
 tda998x-y := tda998x_drv.o
 obj-$(CONFIG_DRM_I2C_NXP_TDA998X) += tda998x.o
+
+sii9022-y := sii9022_drv.o
+obj-$(CONFIG_DRM_I2C_SII9022) +=sii9022.o
diff --git a/drivers/gpu/drm/i2c/sii9022_drv.c b/drivers/gpu/drm/i2c/sii9022_drv.c
new file mode 100644
index 0000000..bc49cad
--- /dev/null
+++ b/drivers/gpu/drm/i2c/sii9022_drv.c
@@ -0,0 +1,449 @@
+/*
+ * Copyright 2015 Freescale Semiconductor, Inc.
+ *
+ * Freescale DCU drm device driver
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/console.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/fb.h>
+#include <linux/fsl_devices.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/backlight.h>
+#include <video/videomode.h>
+#include <video/of_display_timing.h>
+
+#include <drm/drmP.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_encoder_slave.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_edid.h>
+
+
+#define SII902X_INPUT_BUS_FMT	0x08
+#define SII902X_TPI_AVI_INPUT_FMT	0x09
+#define SII902X_TPI_AVI_OUTPUT_FMT	0x0A
+#define SII902X_SYS_CONTROL	0x1A
+#define SII902X_SYS_CTR_DDC_REQ	BIT(2)
+#define SII902X_SYS_CTR_DDC_BUS_AVAI	(BIT(2) | BIT(1))
+#define SII902X_TPI_FAMILY_DEV_ID	0x1B
+#define SII902X_TPI_DEV_REV_ID	0x1C
+#define SII902X_TPI_REV_LEVEL_ID	0x1D
+#define SII902X_POWER_STATE	0x1E
+#define SII902X_TPI_AUDIO_CFG0	0x24
+#define SII902X_TPI_AUDIO_CFG1	0x25
+#define SII902X_TPI_AUDIO_CFG2	0x26
+#define SII902X_TPI_AUDIO_CFG3	0x27
+#define SII902X_TPI_HDCP_REV	0x30
+#define SII902X_TPI_INT_ENABLE	0x3C
+#define SII902X_TPI_INT_STATUS	0x3D
+#define SII902X_TPI_INT_PLUG_IN	BIT(2)
+#define SII902X_GENERAL_PURPOSE_IO0	0xBC
+#define SII902X_GENERAL_PURPOSE_IO1	0xBD
+#define SII902X_GENERAL_PURPOSE_IO2	0xBE
+#define SII902X_TRANS_MODE_DIFF	0xC7
+
+bool g_enable_hdmi;
+
+struct sii902x_data {
+	struct i2c_client *client;
+	struct delayed_work det_work;
+	struct fb_info *fbi;
+} *sii902x;
+
+#define to_sii902x_data(x) \
+	((struct sii902x_data *)to_encoder_slave(x)->slave_priv)
+
+static struct i2c_client *sii902x_to_i2c(struct sii902x_data *sii902x)
+{
+	return sii902x->client;
+}
+
+/* HW access functions */
+static s32 sii902x_write(const struct i2c_client *client,
+			 u8 command, u8 value)
+{
+	return i2c_smbus_write_byte_data(client, command, value);
+}
+
+static s32 sii902x_read(const struct i2c_client *client, u8 command)
+{
+	int val;
+
+	val = i2c_smbus_read_word_data(client, command);
+
+	return val & 0xff;
+}
+
+static void sii902x_poweron(void)
+{
+	/* Turn on DVI or HDMI */
+	sii902x_write(sii902x->client, SII902X_SYS_CONTROL, 0x00);
+}
+
+static void sii902x_poweroff(void)
+{
+	/* disable tmds before changing resolution */
+	sii902x_write(sii902x->client, SII902X_SYS_CONTROL, 0x10);
+}
+
+
+static void sii902x_chip_id(struct sii902x_data *sii902x)
+{
+	struct i2c_client *client = sii902x_to_i2c(sii902x);
+	int val;
+
+	/* read device ID */
+	val = sii902x_read(client, SII902X_TPI_FAMILY_DEV_ID);
+	pr_info("Sii902x: read id = 0x%02X", val);
+	val = sii902x_read(client, SII902X_TPI_DEV_REV_ID);
+	pr_info("-0x%02X", val);
+	val = sii902x_read(client, SII902X_TPI_REV_LEVEL_ID);
+	pr_info("-0x%02X", val);
+	val = sii902x_read(client, SII902X_TPI_HDCP_REV);
+	pr_info("-0x%02X\n", val);
+}
+
+static int sii902x_initialize(struct sii902x_data *sii902x)
+{
+	struct i2c_client *client = sii902x_to_i2c(sii902x);
+	int ret, cnt;
+
+	for (cnt = 0; cnt < 5; cnt++) {
+		/* Set 902x in hardware TPI mode on and jump out of D3 state */
+		ret = sii902x_write(client, SII902X_TRANS_MODE_DIFF, 0x00);
+		if (ret < 0)
+			break;
+	}
+	if (ret != 0)
+		dev_err(&client->dev, "cound not find device\n");
+
+	return ret;
+}
+
+static void sii902x_enable_source(struct sii902x_data *sii902x)
+{
+	struct i2c_client *client = sii902x_to_i2c(sii902x);
+	int val;
+
+	sii902x_write(client, SII902X_GENERAL_PURPOSE_IO0, 0x01);
+	sii902x_write(client, SII902X_GENERAL_PURPOSE_IO1, 0x82);
+	val = sii902x_read(client, SII902X_GENERAL_PURPOSE_IO2);
+	val |= 0x1;
+	sii902x_write(client, SII902X_GENERAL_PURPOSE_IO2, val);
+}
+
+static void sii902x_power_up_tx(struct sii902x_data *sii902x)
+{
+	struct i2c_client *client = sii902x_to_i2c(sii902x);
+	int val;
+
+	val = sii902x_read(client, SII902X_POWER_STATE);
+	val &= ~0x3;
+	sii902x_write(client, SII902X_POWER_STATE, val);
+}
+
+static int sii902x_get_edid_preconfig(void)
+{
+	int old, dat, ret = 0, cnt = 100;
+
+	old = sii902x_read(sii902x->client, SII902X_SYS_CONTROL);
+
+	sii902x_write(sii902x->client, SII902X_SYS_CONTROL,
+		      old | SII902X_SYS_CTR_DDC_REQ);
+	do {
+		cnt--;
+		msleep(20);
+		dat = sii902x_read(sii902x->client, SII902X_SYS_CONTROL);
+	} while ((!(dat & 0x2)) && cnt);
+
+	if (!cnt) {
+		ret = -1;
+		goto done;
+	}
+
+	sii902x_write(sii902x->client, SII902X_SYS_CONTROL,
+		      old | SII902X_SYS_CTR_DDC_BUS_AVAI);
+
+done:
+	sii902x_write(sii902x->client, SII902X_SYS_CONTROL, old);
+	return ret;
+}
+
+static int __init enable_hdmi_setup(char *str)
+{
+	g_enable_hdmi = true;
+
+	return 1;
+}
+
+__setup("hdmi", enable_hdmi_setup);
+
+static irqreturn_t sii902x_detect_handler(int irq, void *data)
+{
+	if (g_enable_hdmi)
+		g_enable_hdmi = false;
+
+	return IRQ_HANDLED;
+}
+
+static int sii902x_probe(struct i2c_client *client,
+			 const struct i2c_device_id *id)
+{
+	struct i2c_adapter *adap = to_i2c_adapter(client->dev.parent);
+	int ret, err;
+
+	if (!g_enable_hdmi)
+		return -EPERM;
+
+	if (!i2c_check_functionality(adap, I2C_FUNC_SMBUS_BYTE)) {
+		dev_err(&client->dev, "i2c_check_functionality error\n");
+		return -ENODEV;
+	}
+
+	sii902x = devm_kzalloc(&client->dev, sizeof(*sii902x), GFP_KERNEL);
+	if (!sii902x)
+		return -ENOMEM;
+
+	sii902x->client = client;
+	i2c_set_clientdata(client, sii902x);
+
+	err = sii902x_initialize(sii902x);
+	if (err)
+		return err;
+
+	sii902x_chip_id(sii902x);
+	sii902x_power_up_tx(sii902x);
+	sii902x_enable_source(sii902x);
+
+	if (sii902x_get_edid_preconfig() < 0)
+		dev_warn(&client->dev, "Read edid preconfig failed\n");
+
+	if (client->irq) {
+		ret = devm_request_irq(&client->dev, client->irq,
+				       sii902x_detect_handler, 0,
+				       "SII902x_det", sii902x);
+		if (ret < 0)
+			dev_warn(&client->dev,
+				 "cound not request det irq %d\n",
+				 client->irq);
+		else {
+			/*enable cable hot plug irq*/
+			sii902x_write(client, SII902X_TPI_INT_ENABLE, 0x01);
+		}
+	}
+
+	return 0;
+}
+
+static int sii902x_remove(struct i2c_client *client)
+{
+	sii902x_poweroff();
+	return 0;
+}
+
+/* DRM encoder functions */
+
+static void
+sii902x_encoder_dpms(struct drm_encoder *encoder, int mode)
+{
+	if (mode == DRM_MODE_DPMS_ON)
+		sii902x_poweron();
+	else
+		sii902x_poweroff();
+}
+
+
+static int
+sii902x_encoder_mode_valid(struct drm_encoder *encoder,
+			  struct drm_display_mode *mode)
+{
+	return 0;
+}
+
+static void
+sii902x_encoder_mode_set(struct drm_encoder *encoder,
+			struct drm_display_mode *mode,
+			struct drm_display_mode *adjusted_mode)
+{
+	struct videomode vm;
+	u16 data[4];
+	u32 refresh;
+	u8 *tmp;
+	int i;
+
+	/* Power up */
+	sii902x_power_up_tx(sii902x);
+
+	drm_display_mode_to_videomode(mode, &vm);
+	data[0] = PICOS2KHZ(vm.pixelclock) / 10;
+	data[2] = vm.hsync_len + vm.hback_porch +
+		  vm.hactive + vm.hfront_porch;
+	data[3] = vm.vsync_len + vm.vfront_porch +
+		  vm.vactive + vm.vback_porch;
+	refresh = data[2] * data[3];
+	refresh = (PICOS2KHZ(vm.pixelclock) * 1000) / refresh;
+	data[1] = refresh * 100;
+
+	tmp = (u8 *)data;
+	for (i = 0; i < 8; i++)
+		sii902x_write(sii902x->client, i, tmp[i]);
+
+	/* input bus/pixel: full pixel wide (24bit), rising edge */
+	sii902x_write(sii902x->client, SII902X_INPUT_BUS_FMT, 0x70);
+	/* Set input format to RGB */
+	sii902x_write(sii902x->client, SII902X_TPI_AVI_INPUT_FMT, 0x00);
+	/* set output format to RGB */
+	sii902x_write(sii902x->client, SII902X_TPI_AVI_OUTPUT_FMT, 0x00);
+	/* audio setup */
+	sii902x_write(sii902x->client, SII902X_TPI_AUDIO_CFG1, 0x00);
+	sii902x_write(sii902x->client, SII902X_TPI_AUDIO_CFG2, 0x40);
+	sii902x_write(sii902x->client, SII902X_TPI_AUDIO_CFG3, 0x00);
+}
+
+struct edid *sii902x_drm_get_edid(struct drm_connector *connector,
+				  struct i2c_adapter *adapter)
+{
+	int old, dat, cnt = 100;
+	struct edid *edid;
+
+	old = sii902x_read(sii902x->client, SII902X_SYS_CONTROL);
+
+	sii902x_write(sii902x->client, SII902X_SYS_CONTROL,
+		      old | SII902X_SYS_CTR_DDC_REQ);
+	do {
+		cnt--;
+		msleep(20);
+		dat = sii902x_read(sii902x->client, SII902X_SYS_CONTROL);
+	} while ((!(dat & 0x2)) && cnt);
+
+	if (!cnt) {
+		edid = NULL;
+		goto done;
+	}
+
+	sii902x_write(sii902x->client, SII902X_SYS_CONTROL,
+		      old | SII902X_SYS_CTR_DDC_BUS_AVAI);
+
+	/* edid reading */
+	edid = drm_get_edid(connector, adapter);
+
+	cnt = 100;
+	do {
+		cnt--;
+		sii902x_write(sii902x->client, SII902X_SYS_CONTROL,
+			      old & ~SII902X_SYS_CTR_DDC_BUS_AVAI);
+		msleep(20);
+		dat = sii902x_read(sii902x->client, SII902X_SYS_CONTROL);
+	} while ((dat & 0x6) && cnt);
+
+	if (!cnt)
+		edid = NULL;
+
+done:
+	sii902x_write(sii902x->client, SII902X_SYS_CONTROL, old);
+	return edid;
+}
+
+static int
+sii902x_encoder_get_modes(struct drm_encoder *encoder,
+			 struct drm_connector *connector)
+{
+	struct drm_device *dev = connector->dev;
+	struct i2c_adapter *adap = to_i2c_adapter(sii902x->client->dev.parent);
+	struct edid *edid;
+	struct drm_display_mode *mode;
+	int ret;
+
+	edid = sii902x_drm_get_edid(connector, adap);
+	if (edid) {
+		drm_mode_connector_update_edid_property(connector, edid);
+		ret = drm_add_edid_modes(connector, edid);
+		kfree(edid);
+	} else {
+		dev_dbg(dev->dev, "failed to get edid\n");
+	}
+
+	list_for_each_entry(mode, &connector->probed_modes, head) {
+		if (mode->hdisplay == 1024 || mode->vdisplay == 768)
+			mode->type |= DRM_MODE_TYPE_PREFERRED;
+		else
+			mode->type &= ~DRM_MODE_TYPE_PREFERRED;
+	}
+
+	return ret;
+}
+
+static struct drm_encoder_slave_funcs sii902x_encoder_funcs = {
+	.dpms = sii902x_encoder_dpms,
+	.mode_valid = sii902x_encoder_mode_valid,
+	.mode_set = sii902x_encoder_mode_set,
+	.get_modes = sii902x_encoder_get_modes,
+};
+static int
+sii902x_encoder_init(struct i2c_client *client,
+		    struct drm_device *dev,
+		    struct drm_encoder_slave *encoder)
+{
+
+	encoder->slave_funcs = &sii902x_encoder_funcs;
+
+	return 0;
+}
+static const struct i2c_device_id sii902x_id[] = {
+	{ "sii902x", 0 },
+	{},
+};
+MODULE_DEVICE_TABLE(i2c, sii902x_id);
+
+static const struct of_device_id sii902x_dt_ids[] = {
+	{ .compatible = "sil,sii9022a", },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, sii902x_dt_ids);
+
+static struct drm_i2c_encoder_driver sii902x_driver = {
+	.i2c_driver = {
+		.probe = sii902x_probe,
+		.remove = sii902x_remove,
+		.driver = {
+			.name = "sii902x",
+			.owner = THIS_MODULE,
+			.of_match_table = sii902x_dt_ids,
+		},
+		.id_table = sii902x_id,
+	},
+	.encoder_init = sii902x_encoder_init,
+};
+
+/* Module initialization */
+
+static int __init sii902x_init(void)
+{
+	return drm_i2c_encoder_register(THIS_MODULE, &sii902x_driver);
+}
+
+static void __exit sii902x_exit(void)
+{
+	drm_i2c_encoder_unregister(&sii902x_driver);
+}
+
+
+MODULE_AUTHOR("Freescale Semiconductor, Inc.");
+MODULE_DESCRIPTION("SII902x DVI/HDMI driver");
+MODULE_LICENSE("GPL");
+
+
+module_init(sii902x_init);
+module_exit(sii902x_exit);