video: add anx6345 DM driver

This is a eDP bridge similar to ANX9804, it allows to connect eDP panels
to the chips that can output only parallel signal

Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>
[agust: fixed most checkpatch errors/warnings]
Signed-off-by: Anatolij Gustschin <agust@denx.de>

3 files changed, 435 insertions, 0 deletions

diff --git a/drivers/video/bridge/Kconfig b/drivers/video/bridge/Kconfig
index 2a3b6c4..765f738 100644
--- a/drivers/video/bridge/Kconfig
+++ b/drivers/video/bridge/Kconfig
@@ -25,3 +25,11 @@ config VIDEO_BRIDGE_NXP_PTN3460
 	  signalling) converter. It enables an LVDS LCD panel to be connected
 	  to an eDP output device such as an SoC that lacks LVDS capability,
 	  or where LVDS requires too many signals to route on the PCB.
+
+config VIDEO_BRIDGE_ANALOGIX_ANX6345
+	bool "Support Analogix ANX6345 RGB->DP bridge"
+	depends on VIDEO_BRIDGE
+	select DM_I2C
+	help
+	 The Analogix ANX6345 is RGB-to-DP converter. It enables an eDP LCD
+	 panel to be connected to an parallel LCD interface.
diff --git a/drivers/video/bridge/Makefile b/drivers/video/bridge/Makefile
index ce731fa..2a746c6 100644
--- a/drivers/video/bridge/Makefile
+++ b/drivers/video/bridge/Makefile
@@ -7,3 +7,4 @@
 obj-$(CONFIG_VIDEO_BRIDGE) += video-bridge-uclass.o
 obj-$(CONFIG_VIDEO_BRIDGE_PARADE_PS862X) += ps862x.o
 obj-$(CONFIG_VIDEO_BRIDGE_NXP_PTN3460) += ptn3460.o
+obj-$(CONFIG_VIDEO_BRIDGE_ANALOGIX_ANX6345) += anx6345.o
diff --git a/drivers/video/bridge/anx6345.c b/drivers/video/bridge/anx6345.c
new file mode 100644
index 0000000..0a94aff
--- /dev/null
+++ b/drivers/video/bridge/anx6345.c
@@ -0,0 +1,426 @@
+/*
+ * Copyright (C) 2017 Vasily Khoruzhick <anarsoul@gmail.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#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
+
+DECLARE_GLOBAL_DATA_PTR;
+
+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),
+};