u-boot/drivers/video/bridge/anx6345.c
Vasily Khoruzhick 491041c749 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>
2017-10-26 15:43:11 +02:00

426 lines
10 KiB
C

/*
* 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),
};