drivers/video/bridge/anx6345.c - u-boot-mtk - Git at Google

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * Copyright (C) 2017 Vasily Khoruzhick <anarsoul@gmail.com>
  */

 #include <common.h>
 #include <dm.h>
 #include <errno.h>
 #include <i2c.h>
 #include <edid.h>
 #include <video_bridge.h>
 #include "../anx98xx-edp.h"

 #define DP_MAX_LINK_RATE		0x001
 #define DP_MAX_LANE_COUNT		0x002
 #define DP_MAX_LANE_COUNT_MASK		0x1f

 struct anx6345_priv {
 	u8 edid[EDID_SIZE];
 };

 static int anx6345_write(struct udevice *dev, unsigned int addr_off,
 			 unsigned char reg_addr, unsigned char value)
 {
 	uint8_t buf[2];
 	struct i2c_msg msg;
 	int ret;

 	msg.addr = addr_off;
 	msg.flags = 0;
 	buf[0] = reg_addr;
 	buf[1] = value;
 	msg.buf = buf;
 	msg.len = 2;
 	ret = dm_i2c_xfer(dev, &msg, 1);
 	if (ret) {
 		debug("%s: write failed, reg=%#x, value=%#x, ret=%d\n",
 		      __func__, reg_addr, value, ret);
 		return ret;
 	}

 	return 0;
 }

 static int anx6345_read(struct udevice *dev, unsigned int addr_off,
 			unsigned char reg_addr, unsigned char *value)
 {
 	uint8_t addr, val;
 	struct i2c_msg msg[2];
 	int ret;

 	msg[0].addr = addr_off;
 	msg[0].flags = 0;
 	addr = reg_addr;
 	msg[0].buf = &addr;
 	msg[0].len = 1;
 	msg[1].addr = addr_off;
 	msg[1].flags = I2C_M_RD;
 	msg[1].buf = &val;
 	msg[1].len = 1;
 	ret = dm_i2c_xfer(dev, msg, 2);
 	if (ret) {
 		debug("%s: read failed, reg=%.2x, value=%p, ret=%d\n",
 		      __func__, (int)reg_addr, value, ret);
 		return ret;
 	}
 	*value = val;

 	return 0;
 }

 static int anx6345_write_r0(struct udevice *dev, unsigned char reg_addr,
 			    unsigned char value)
 {
 	struct dm_i2c_chip *chip = dev_get_parent_platdata(dev);

 	return anx6345_write(dev, chip->chip_addr, reg_addr, value);
 }

 static int anx6345_read_r0(struct udevice *dev, unsigned char reg_addr,
 			   unsigned char *value)
 {
 	struct dm_i2c_chip *chip = dev_get_parent_platdata(dev);

 	return anx6345_read(dev, chip->chip_addr, reg_addr, value);
 }

 static int anx6345_write_r1(struct udevice *dev, unsigned char reg_addr,
 			    unsigned char value)
 {
 	struct dm_i2c_chip *chip = dev_get_parent_platdata(dev);

 	return anx6345_write(dev, chip->chip_addr + 1, reg_addr, value);
 }

 static int anx6345_read_r1(struct udevice *dev, unsigned char reg_addr,
 			   unsigned char *value)
 {
 	struct dm_i2c_chip *chip = dev_get_parent_platdata(dev);

 	return anx6345_read(dev, chip->chip_addr + 1, reg_addr, value);
 }

 static int anx6345_set_backlight(struct udevice *dev, int percent)
 {
 	return -ENOSYS;
 }

 static int anx6345_aux_wait(struct udevice *dev)
 {
 	int ret = -ETIMEDOUT;
 	u8 v;
 	int retries = 1000;

 	do {
 		anx6345_read_r0(dev, ANX9804_DP_AUX_CH_CTL_2, &v);
 		if (!(v & ANX9804_AUX_EN)) {
 			ret = 0;
 			break;
 		}
 		udelay(100);
 	} while (retries--);

 	if (ret) {
 		debug("%s: timed out waiting for AUX_EN to clear\n", __func__);
 		return ret;
 	}

 	ret = -ETIMEDOUT;
 	retries = 1000;
 	do {
 		anx6345_read_r1(dev, ANX9804_DP_INT_STA, &v);
 		if (v & ANX9804_RPLY_RECEIV) {
 			ret = 0;
 			break;
 		}
 		udelay(100);
 	} while (retries--);

 	if (ret) {
 		debug("%s: timed out waiting to receive reply\n", __func__);
 		return ret;
 	}

 	/* Clear RPLY_RECEIV bit */
 	anx6345_write_r1(dev, ANX9804_DP_INT_STA, v);

 	anx6345_read_r0(dev, ANX9804_AUX_CH_STA, &v);
 	if ((v & ANX9804_AUX_STATUS_MASK) != 0) {
 		debug("AUX status: %d\n", v & ANX9804_AUX_STATUS_MASK);
 		ret = -EIO;
 	}

 	return ret;
 }

 static void anx6345_aux_addr(struct udevice *dev, u32 addr)
 {
 	u8 val;

 	val = addr & 0xff;
 	anx6345_write_r0(dev, ANX9804_DP_AUX_ADDR_7_0, val);
 	val = (addr >> 8) & 0xff;
 	anx6345_write_r0(dev, ANX9804_DP_AUX_ADDR_15_8, val);
 	val = (addr >> 16) & 0x0f;
 	anx6345_write_r0(dev, ANX9804_DP_AUX_ADDR_19_16, val);
 }

 static int anx6345_aux_transfer(struct udevice *dev, u8 req,
 				u32 addr, u8 *buf, size_t len)
 {
 	int i, ret;
 	u8 ctrl1 = req;
 	u8 ctrl2 = ANX9804_AUX_EN;

 	if (len > 16)
 		return -E2BIG;

 	if (len)
 		ctrl1 |= ANX9804_AUX_LENGTH(len);
 	else
 		ctrl2 |= ANX9804_ADDR_ONLY;

 	if (len && !(req & ANX9804_AUX_TX_COMM_READ)) {
 		for (i = 0; i < len; i++)
 			anx6345_write_r0(dev, ANX9804_BUF_DATA_0 + i, buf[i]);
 	}

 	anx6345_aux_addr(dev, addr);
 	anx6345_write_r0(dev, ANX9804_DP_AUX_CH_CTL_1, ctrl1);
 	anx6345_write_r0(dev, ANX9804_DP_AUX_CH_CTL_2, ctrl2);
 	ret = anx6345_aux_wait(dev);
 	if (ret) {
 		debug("AUX transaction timed out\n");
 		return ret;
 	}

 	if (len && (req & ANX9804_AUX_TX_COMM_READ)) {
 		for (i = 0; i < len; i++)
 			anx6345_read_r0(dev, ANX9804_BUF_DATA_0 + i, &buf[i]);
 	}

 	return 0;
 }

 static int anx6345_read_aux_i2c(struct udevice *dev, u8 chip_addr,
 				u8 offset, size_t count, u8 *buf)
 {
 	int i, ret;
 	size_t cur_cnt;
 	u8 cur_offset;

 	for (i = 0; i < count; i += 16) {
 		cur_cnt = (count - i) > 16 ? 16 : count - i;
 		cur_offset = offset + i;
 		ret = anx6345_aux_transfer(dev, ANX9804_AUX_TX_COMM_MOT,
 					   chip_addr, &cur_offset, 1);
 		if (ret) {
 			debug("%s: failed to set i2c offset: %d\n",
 			      __func__, ret);
 			return ret;
 		}
 		ret = anx6345_aux_transfer(dev, ANX9804_AUX_TX_COMM_READ,
 					   chip_addr, buf + i, cur_cnt);
 		if (ret) {
 			debug("%s: failed to read from i2c device: %d\n",
 			      __func__, ret);
 			return ret;
 		}
 	}

 	return 0;
 }

 static int anx6345_read_dpcd(struct udevice *dev, u32 reg, u8 *val)
 {
 	int ret;

 	ret = anx6345_aux_transfer(dev,
 				   ANX9804_AUX_TX_COMM_READ |
 				   ANX9804_AUX_TX_COMM_DP_TRANSACTION,
 				   reg, val, 1);
 	if (ret) {
 		debug("Failed to read DPCD\n");
 		return ret;
 	}

 	return 0;
 }

 static int anx6345_read_edid(struct udevice *dev, u8 *buf, int size)
 {
 	struct anx6345_priv *priv = dev_get_priv(dev);

 	if (size > EDID_SIZE)
 		size = EDID_SIZE;
 	memcpy(buf, priv->edid, size);

 	return size;
 }

 static int anx6345_attach(struct udevice *dev)
 {
 	/* No-op */
 	return 0;
 }

 static int anx6345_enable(struct udevice *dev)
 {
 	u8 chipid, colordepth, lanes, data_rate, c;
 	int ret, i, bpp;
 	struct display_timing timing;
 	struct anx6345_priv *priv = dev_get_priv(dev);

 	/* Deassert reset and enable power */
 	ret = video_bridge_set_active(dev, true);
 	if (ret)
 		return ret;

 	/* Reset */
 	anx6345_write_r1(dev, ANX9804_RST_CTRL_REG, 1);
 	mdelay(100);
 	anx6345_write_r1(dev, ANX9804_RST_CTRL_REG, 0);

 	/* Write 0 to the powerdown reg (powerup everything) */
 	anx6345_write_r1(dev, ANX9804_POWERD_CTRL_REG, 0);

 	ret = anx6345_read_r1(dev, ANX9804_DEV_IDH_REG, &chipid);
 	if (ret)
 		debug("%s: read id failed: %d\n", __func__, ret);

 	switch (chipid) {
 	case 0x63:
 		debug("ANX63xx detected.\n");
 		break;
 	default:
 		debug("Error anx6345 chipid mismatch: %.2x\n", (int)chipid);
 		return -ENODEV;
 	}

 	for (i = 0; i < 100; i++) {
 		anx6345_read_r0(dev, ANX9804_SYS_CTRL2_REG, &c);
 		anx6345_write_r0(dev, ANX9804_SYS_CTRL2_REG, c);
 		anx6345_read_r0(dev, ANX9804_SYS_CTRL2_REG, &c);
 		if ((c & ANX9804_SYS_CTRL2_CHA_STA) == 0)
 			break;

 		mdelay(5);
 	}
 	if (i == 100)
 		debug("Error anx6345 clock is not stable\n");

 	/* Set a bunch of analog related register values */
 	anx6345_write_r0(dev, ANX9804_PLL_CTRL_REG, 0x00);
 	anx6345_write_r1(dev, ANX9804_ANALOG_DEBUG_REG1, 0x70);
 	anx6345_write_r0(dev, ANX9804_LINK_DEBUG_REG, 0x30);

 	/* Force HPD */
 	anx6345_write_r0(dev, ANX9804_SYS_CTRL3_REG,
 			 ANX9804_SYS_CTRL3_F_HPD | ANX9804_SYS_CTRL3_HPD_CTRL);

 	/* Power up and configure lanes */
 	anx6345_write_r0(dev, ANX9804_ANALOG_POWER_DOWN_REG, 0x00);
 	anx6345_write_r0(dev, ANX9804_TRAINING_LANE0_SET_REG, 0x00);
 	anx6345_write_r0(dev, ANX9804_TRAINING_LANE1_SET_REG, 0x00);
 	anx6345_write_r0(dev, ANX9804_TRAINING_LANE2_SET_REG, 0x00);
 	anx6345_write_r0(dev, ANX9804_TRAINING_LANE3_SET_REG, 0x00);

 	/* Reset AUX CH */
 	anx6345_write_r1(dev, ANX9804_RST_CTRL2_REG,
 			 ANX9804_RST_CTRL2_AUX);
 	anx6345_write_r1(dev, ANX9804_RST_CTRL2_REG, 0);

 	/* Powerdown audio and some other unused bits */
 	anx6345_write_r1(dev, ANX9804_POWERD_CTRL_REG, ANX9804_POWERD_AUDIO);
 	anx6345_write_r0(dev, ANX9804_HDCP_CONTROL_0_REG, 0x00);
 	anx6345_write_r0(dev, 0xa7, 0x00);

 	anx6345_read_aux_i2c(dev, 0x50, 0x0, EDID_SIZE, priv->edid);
 	if (edid_get_timing(priv->edid, EDID_SIZE, &timing, &bpp) != 0) {
 		debug("Failed to parse EDID\n");
 		return -EIO;
 	}
 	debug("%s: panel found: %dx%d, bpp %d\n", __func__,
 	      timing.hactive.typ, timing.vactive.typ, bpp);
 	if (bpp == 6)
 		colordepth = 0x00; /* 6 bit */
 	else
 		colordepth = 0x10; /* 8 bit */
 	anx6345_write_r1(dev, ANX9804_VID_CTRL2_REG, colordepth);

 	if (anx6345_read_dpcd(dev, DP_MAX_LINK_RATE, &data_rate)) {
 		debug("%s: Failed to DP_MAX_LINK_RATE\n", __func__);
 		return -EIO;
 	}
 	debug("%s: data_rate: %d\n", __func__, (int)data_rate);
 	if (anx6345_read_dpcd(dev, DP_MAX_LANE_COUNT, &lanes)) {
 		debug("%s: Failed to read DP_MAX_LANE_COUNT\n", __func__);
 		return -EIO;
 	}
 	lanes &= DP_MAX_LANE_COUNT_MASK;
 	debug("%s: lanes: %d\n", __func__, (int)lanes);

 	/* Set data-rate / lanes */
 	anx6345_write_r0(dev, ANX9804_LINK_BW_SET_REG, data_rate);
 	anx6345_write_r0(dev, ANX9804_LANE_COUNT_SET_REG, lanes);

 	/* Link training */
 	anx6345_write_r0(dev, ANX9804_LINK_TRAINING_CTRL_REG,
 			 ANX9804_LINK_TRAINING_CTRL_EN);
 	mdelay(5);
 	for (i = 0; i < 100; i++) {
 		anx6345_read_r0(dev, ANX9804_LINK_TRAINING_CTRL_REG, &c);
 		if ((chipid == 0x63) && (c & 0x80) == 0)
 			break;

 		mdelay(5);
 	}
 	if (i == 100) {
 		debug("Error anx6345 link training timeout\n");
 		return -ENODEV;
 	}

 	/* Enable */
 	anx6345_write_r1(dev, ANX9804_VID_CTRL1_REG,
 			 ANX9804_VID_CTRL1_VID_EN | ANX9804_VID_CTRL1_EDGE);
 	/* Force stream valid */
 	anx6345_write_r0(dev, ANX9804_SYS_CTRL3_REG,
 			 ANX9804_SYS_CTRL3_F_HPD |
 			 ANX9804_SYS_CTRL3_HPD_CTRL |
 			 ANX9804_SYS_CTRL3_F_VALID |
 			 ANX9804_SYS_CTRL3_VALID_CTRL);

 	return 0;
 }

 static int anx6345_probe(struct udevice *dev)
 {
 	if (device_get_uclass_id(dev->parent) != UCLASS_I2C)
 		return -EPROTONOSUPPORT;

 	return anx6345_enable(dev);
 }

 struct video_bridge_ops anx6345_ops = {
 	.attach = anx6345_attach,
 	.set_backlight = anx6345_set_backlight,
 	.read_edid = anx6345_read_edid,
 };

 static const struct udevice_id anx6345_ids[] = {
 	{ .compatible = "analogix,anx6345", },
 	{ }
 };

 U_BOOT_DRIVER(analogix_anx6345) = {
 	.name	= "analogix_anx6345",
 	.id	= UCLASS_VIDEO_BRIDGE,
 	.of_match = anx6345_ids,
 	.probe	= anx6345_probe,
 	.ops	= &anx6345_ops,
 	.priv_auto_alloc_size = sizeof(struct anx6345_priv),
 };
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* Copyright (C) 2017 Vasily Khoruzhick <anarsoul@gmail.com>
	*/

	#include <common.h>
	#include <dm.h>
	#include <errno.h>
	#include <i2c.h>
	#include <edid.h>
	#include <video_bridge.h>
	#include "../anx98xx-edp.h"

	#define DP_MAX_LINK_RATE 0x001
	#define DP_MAX_LANE_COUNT 0x002
	#define DP_MAX_LANE_COUNT_MASK 0x1f

	struct anx6345_priv {
	u8 edid[EDID_SIZE];
	};

	static int anx6345_write(struct udevice *dev, unsigned int addr_off,
	unsigned char reg_addr, unsigned char value)
	{
	uint8_t buf[2];
	struct i2c_msg msg;
	int ret;

	msg.addr = addr_off;
	msg.flags = 0;
	buf[0] = reg_addr;
	buf[1] = value;
	msg.buf = buf;
	msg.len = 2;
	ret = dm_i2c_xfer(dev, &msg, 1);
	if (ret) {
	debug("%s: write failed, reg=%#x, value=%#x, ret=%d\n",
	__func__, reg_addr, value, ret);
	return ret;
	}

	return 0;
	}

	static int anx6345_read(struct udevice *dev, unsigned int addr_off,
	unsigned char reg_addr, unsigned char *value)
	{
	uint8_t addr, val;
	struct i2c_msg msg[2];
	int ret;

	msg[0].addr = addr_off;
	msg[0].flags = 0;
	addr = reg_addr;
	msg[0].buf = &addr;
	msg[0].len = 1;
	msg[1].addr = addr_off;
	msg[1].flags = I2C_M_RD;
	msg[1].buf = &val;
	msg[1].len = 1;
	ret = dm_i2c_xfer(dev, msg, 2);
	if (ret) {
	debug("%s: read failed, reg=%.2x, value=%p, ret=%d\n",
	__func__, (int)reg_addr, value, ret);
	return ret;
	}
	*value = val;

	return 0;
	}

	static int anx6345_write_r0(struct udevice *dev, unsigned char reg_addr,
	unsigned char value)
	{
	struct dm_i2c_chip *chip = dev_get_parent_platdata(dev);

	return anx6345_write(dev, chip->chip_addr, reg_addr, value);
	}

	static int anx6345_read_r0(struct udevice *dev, unsigned char reg_addr,
	unsigned char *value)
	{
	struct dm_i2c_chip *chip = dev_get_parent_platdata(dev);

	return anx6345_read(dev, chip->chip_addr, reg_addr, value);
	}

	static int anx6345_write_r1(struct udevice *dev, unsigned char reg_addr,
	unsigned char value)
	{
	struct dm_i2c_chip *chip = dev_get_parent_platdata(dev);

	return anx6345_write(dev, chip->chip_addr + 1, reg_addr, value);
	}

	static int anx6345_read_r1(struct udevice *dev, unsigned char reg_addr,
	unsigned char *value)
	{
	struct dm_i2c_chip *chip = dev_get_parent_platdata(dev);

	return anx6345_read(dev, chip->chip_addr + 1, reg_addr, value);
	}

	static int anx6345_set_backlight(struct udevice *dev, int percent)
	{
	return -ENOSYS;
	}

	static int anx6345_aux_wait(struct udevice *dev)
	{
	int ret = -ETIMEDOUT;
	u8 v;
	int retries = 1000;

	do {
	anx6345_read_r0(dev, ANX9804_DP_AUX_CH_CTL_2, &v);
	if (!(v & ANX9804_AUX_EN)) {
	ret = 0;
	break;
	}
	udelay(100);
	} while (retries--);

	if (ret) {
	debug("%s: timed out waiting for AUX_EN to clear\n", __func__);
	return ret;
	}

	ret = -ETIMEDOUT;
	retries = 1000;
	do {
	anx6345_read_r1(dev, ANX9804_DP_INT_STA, &v);
	if (v & ANX9804_RPLY_RECEIV) {
	ret = 0;
	break;
	}
	udelay(100);
	} while (retries--);

	if (ret) {
	debug("%s: timed out waiting to receive reply\n", __func__);
	return ret;
	}

	/* Clear RPLY_RECEIV bit */
	anx6345_write_r1(dev, ANX9804_DP_INT_STA, v);

	anx6345_read_r0(dev, ANX9804_AUX_CH_STA, &v);
	if ((v & ANX9804_AUX_STATUS_MASK) != 0) {
	debug("AUX status: %d\n", v & ANX9804_AUX_STATUS_MASK);
	ret = -EIO;
	}

	return ret;
	}

	static void anx6345_aux_addr(struct udevice *dev, u32 addr)
	{
	u8 val;

	val = addr & 0xff;
	anx6345_write_r0(dev, ANX9804_DP_AUX_ADDR_7_0, val);
	val = (addr >> 8) & 0xff;
	anx6345_write_r0(dev, ANX9804_DP_AUX_ADDR_15_8, val);
	val = (addr >> 16) & 0x0f;
	anx6345_write_r0(dev, ANX9804_DP_AUX_ADDR_19_16, val);
	}

	static int anx6345_aux_transfer(struct udevice *dev, u8 req,
	u32 addr, u8 *buf, size_t len)
	{
	int i, ret;
	u8 ctrl1 = req;
	u8 ctrl2 = ANX9804_AUX_EN;

	if (len > 16)
	return -E2BIG;

	if (len)
	ctrl1 \|= ANX9804_AUX_LENGTH(len);
	else
	ctrl2 \|= ANX9804_ADDR_ONLY;

	if (len && !(req & ANX9804_AUX_TX_COMM_READ)) {
	for (i = 0; i < len; i++)
	anx6345_write_r0(dev, ANX9804_BUF_DATA_0 + i, buf[i]);
	}

	anx6345_aux_addr(dev, addr);
	anx6345_write_r0(dev, ANX9804_DP_AUX_CH_CTL_1, ctrl1);
	anx6345_write_r0(dev, ANX9804_DP_AUX_CH_CTL_2, ctrl2);
	ret = anx6345_aux_wait(dev);
	if (ret) {
	debug("AUX transaction timed out\n");
	return ret;
	}

	if (len && (req & ANX9804_AUX_TX_COMM_READ)) {
	for (i = 0; i < len; i++)
	anx6345_read_r0(dev, ANX9804_BUF_DATA_0 + i, &buf[i]);
	}

	return 0;
	}

	static int anx6345_read_aux_i2c(struct udevice *dev, u8 chip_addr,
	u8 offset, size_t count, u8 *buf)
	{
	int i, ret;
	size_t cur_cnt;
	u8 cur_offset;

	for (i = 0; i < count; i += 16) {
	cur_cnt = (count - i) > 16 ? 16 : count - i;
	cur_offset = offset + i;
	ret = anx6345_aux_transfer(dev, ANX9804_AUX_TX_COMM_MOT,
	chip_addr, &cur_offset, 1);
	if (ret) {
	debug("%s: failed to set i2c offset: %d\n",
	__func__, ret);
	return ret;
	}
	ret = anx6345_aux_transfer(dev, ANX9804_AUX_TX_COMM_READ,
	chip_addr, buf + i, cur_cnt);
	if (ret) {
	debug("%s: failed to read from i2c device: %d\n",
	__func__, ret);
	return ret;
	}
	}

	return 0;
	}

	static int anx6345_read_dpcd(struct udevice dev, u32 reg, u8 val)
	{
	int ret;

	ret = anx6345_aux_transfer(dev,
	ANX9804_AUX_TX_COMM_READ \|
	ANX9804_AUX_TX_COMM_DP_TRANSACTION,
	reg, val, 1);
	if (ret) {
	debug("Failed to read DPCD\n");
	return ret;
	}

	return 0;
	}

	static int anx6345_read_edid(struct udevice dev, u8 buf, int size)
	{
	struct anx6345_priv *priv = dev_get_priv(dev);

	if (size > EDID_SIZE)
	size = EDID_SIZE;
	memcpy(buf, priv->edid, size);

	return size;
	}

	static int anx6345_attach(struct udevice *dev)
	{
	/* No-op */
	return 0;
	}

	static int anx6345_enable(struct udevice *dev)
	{
	u8 chipid, colordepth, lanes, data_rate, c;
	int ret, i, bpp;
	struct display_timing timing;
	struct anx6345_priv *priv = dev_get_priv(dev);

	/* Deassert reset and enable power */
	ret = video_bridge_set_active(dev, true);
	if (ret)
	return ret;

	/* Reset */
	anx6345_write_r1(dev, ANX9804_RST_CTRL_REG, 1);
	mdelay(100);
	anx6345_write_r1(dev, ANX9804_RST_CTRL_REG, 0);

	/* Write 0 to the powerdown reg (powerup everything) */
	anx6345_write_r1(dev, ANX9804_POWERD_CTRL_REG, 0);

	ret = anx6345_read_r1(dev, ANX9804_DEV_IDH_REG, &chipid);
	if (ret)
	debug("%s: read id failed: %d\n", __func__, ret);

	switch (chipid) {
	case 0x63:
	debug("ANX63xx detected.\n");
	break;
	default:
	debug("Error anx6345 chipid mismatch: %.2x\n", (int)chipid);
	return -ENODEV;
	}

	for (i = 0; i < 100; i++) {
	anx6345_read_r0(dev, ANX9804_SYS_CTRL2_REG, &c);
	anx6345_write_r0(dev, ANX9804_SYS_CTRL2_REG, c);
	anx6345_read_r0(dev, ANX9804_SYS_CTRL2_REG, &c);
	if ((c & ANX9804_SYS_CTRL2_CHA_STA) == 0)
	break;

	mdelay(5);
	}
	if (i == 100)
	debug("Error anx6345 clock is not stable\n");

	/* Set a bunch of analog related register values */
	anx6345_write_r0(dev, ANX9804_PLL_CTRL_REG, 0x00);
	anx6345_write_r1(dev, ANX9804_ANALOG_DEBUG_REG1, 0x70);
	anx6345_write_r0(dev, ANX9804_LINK_DEBUG_REG, 0x30);

	/* Force HPD */
	anx6345_write_r0(dev, ANX9804_SYS_CTRL3_REG,
	ANX9804_SYS_CTRL3_F_HPD \| ANX9804_SYS_CTRL3_HPD_CTRL);

	/* Power up and configure lanes */
	anx6345_write_r0(dev, ANX9804_ANALOG_POWER_DOWN_REG, 0x00);
	anx6345_write_r0(dev, ANX9804_TRAINING_LANE0_SET_REG, 0x00);
	anx6345_write_r0(dev, ANX9804_TRAINING_LANE1_SET_REG, 0x00);
	anx6345_write_r0(dev, ANX9804_TRAINING_LANE2_SET_REG, 0x00);
	anx6345_write_r0(dev, ANX9804_TRAINING_LANE3_SET_REG, 0x00);

	/* Reset AUX CH */
	anx6345_write_r1(dev, ANX9804_RST_CTRL2_REG,
	ANX9804_RST_CTRL2_AUX);
	anx6345_write_r1(dev, ANX9804_RST_CTRL2_REG, 0);

	/* Powerdown audio and some other unused bits */
	anx6345_write_r1(dev, ANX9804_POWERD_CTRL_REG, ANX9804_POWERD_AUDIO);
	anx6345_write_r0(dev, ANX9804_HDCP_CONTROL_0_REG, 0x00);
	anx6345_write_r0(dev, 0xa7, 0x00);

	anx6345_read_aux_i2c(dev, 0x50, 0x0, EDID_SIZE, priv->edid);
	if (edid_get_timing(priv->edid, EDID_SIZE, &timing, &bpp) != 0) {
	debug("Failed to parse EDID\n");
	return -EIO;
	}
	debug("%s: panel found: %dx%d, bpp %d\n", __func__,
	timing.hactive.typ, timing.vactive.typ, bpp);
	if (bpp == 6)
	colordepth = 0x00; /* 6 bit */
	else
	colordepth = 0x10; /* 8 bit */
	anx6345_write_r1(dev, ANX9804_VID_CTRL2_REG, colordepth);

	if (anx6345_read_dpcd(dev, DP_MAX_LINK_RATE, &data_rate)) {
	debug("%s: Failed to DP_MAX_LINK_RATE\n", __func__);
	return -EIO;
	}
	debug("%s: data_rate: %d\n", __func__, (int)data_rate);
	if (anx6345_read_dpcd(dev, DP_MAX_LANE_COUNT, &lanes)) {
	debug("%s: Failed to read DP_MAX_LANE_COUNT\n", __func__);
	return -EIO;
	}
	lanes &= DP_MAX_LANE_COUNT_MASK;
	debug("%s: lanes: %d\n", __func__, (int)lanes);

	/* Set data-rate / lanes */
	anx6345_write_r0(dev, ANX9804_LINK_BW_SET_REG, data_rate);
	anx6345_write_r0(dev, ANX9804_LANE_COUNT_SET_REG, lanes);

	/* Link training */
	anx6345_write_r0(dev, ANX9804_LINK_TRAINING_CTRL_REG,
	ANX9804_LINK_TRAINING_CTRL_EN);
	mdelay(5);
	for (i = 0; i < 100; i++) {
	anx6345_read_r0(dev, ANX9804_LINK_TRAINING_CTRL_REG, &c);
	if ((chipid == 0x63) && (c & 0x80) == 0)
	break;

	mdelay(5);
	}
	if (i == 100) {
	debug("Error anx6345 link training timeout\n");
	return -ENODEV;
	}

	/* Enable */
	anx6345_write_r1(dev, ANX9804_VID_CTRL1_REG,
	ANX9804_VID_CTRL1_VID_EN \| ANX9804_VID_CTRL1_EDGE);
	/* Force stream valid */
	anx6345_write_r0(dev, ANX9804_SYS_CTRL3_REG,
	ANX9804_SYS_CTRL3_F_HPD \|
	ANX9804_SYS_CTRL3_HPD_CTRL \|
	ANX9804_SYS_CTRL3_F_VALID \|
	ANX9804_SYS_CTRL3_VALID_CTRL);

	return 0;
	}

	static int anx6345_probe(struct udevice *dev)
	{
	if (device_get_uclass_id(dev->parent) != UCLASS_I2C)
	return -EPROTONOSUPPORT;

	return anx6345_enable(dev);
	}

	struct video_bridge_ops anx6345_ops = {
	.attach = anx6345_attach,
	.set_backlight = anx6345_set_backlight,
	.read_edid = anx6345_read_edid,
	};

	static const struct udevice_id anx6345_ids[] = {
	{ .compatible = "analogix,anx6345", },
	{ }
	};

	U_BOOT_DRIVER(analogix_anx6345) = {
	.name = "analogix_anx6345",
	.id = UCLASS_VIDEO_BRIDGE,
	.of_match = anx6345_ids,
	.probe = anx6345_probe,
	.ops = &anx6345_ops,
	.priv_auto_alloc_size = sizeof(struct anx6345_priv),
	};