// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2012 Samsung Electronics
*
* Author: Donghwa Lee <dh09.lee@samsung.com>
*/
#include <common.h>
#include <dm.h>
#include <common.h>
#include <display.h>
#include <fdtdec.h>
#include <linux/libfdt.h>
#include <malloc.h>
#include <video_bridge.h>
#include <linux/compat.h>
#include <linux/err.h>
#include <asm/arch/clk.h>
#include <asm/arch/cpu.h>
#include <asm/arch/dp_info.h>
#include <asm/arch/dp.h>
#include <asm/arch/pinmux.h>
#include <asm/arch/power.h>
#include "exynos_dp_lowlevel.h"
DECLARE_GLOBAL_DATA_PTR;
static void exynos_dp_disp_info(struct edp_disp_info *disp_info)
{
disp_info->h_total = disp_info->h_res + disp_info->h_sync_width +
disp_info->h_back_porch + disp_info->h_front_porch;
disp_info->v_total = disp_info->v_res + disp_info->v_sync_width +
disp_info->v_back_porch + disp_info->v_front_porch;
return;
}
static int exynos_dp_init_dp(struct exynos_dp *regs)
{
int ret;
exynos_dp_reset(regs);
/* SW defined function Normal operation */
exynos_dp_enable_sw_func(regs, DP_ENABLE);
ret = exynos_dp_init_analog_func(regs);
if (ret != EXYNOS_DP_SUCCESS)
return ret;
exynos_dp_init_hpd(regs);
exynos_dp_init_aux(regs);
return ret;
}
static unsigned char exynos_dp_calc_edid_check_sum(unsigned char *edid_data)
{
int i;
unsigned char sum = 0;
for (i = 0; i < EDID_BLOCK_LENGTH; i++)
sum = sum + edid_data[i];
return sum;
}
static unsigned int exynos_dp_read_edid(struct exynos_dp *regs)
{
unsigned char edid[EDID_BLOCK_LENGTH * 2];
unsigned int extend_block = 0;
unsigned char sum;
unsigned char test_vector;
int retval;
/*
* EDID device address is 0x50.
* However, if necessary, you must have set upper address
* into E-EDID in I2C device, 0x30.
*/
/* Read Extension Flag, Number of 128-byte EDID extension blocks */
exynos_dp_read_byte_from_i2c(regs, I2C_EDID_DEVICE_ADDR,
EDID_EXTENSION_FLAG, &extend_block);
if (extend_block > 0) {
printf("DP EDID data includes a single extension!\n");
/* Read EDID data */
retval = exynos_dp_read_bytes_from_i2c(regs,
I2C_EDID_DEVICE_ADDR,
EDID_HEADER_PATTERN,
EDID_BLOCK_LENGTH,
&edid[EDID_HEADER_PATTERN]);
if (retval != 0) {
printf("DP EDID Read failed!\n");
return -1;
}
sum = exynos_dp_calc_edid_check_sum(edid);
if (sum != 0) {
printf("DP EDID bad checksum!\n");
return -1;
}
/* Read additional EDID data */
retval = exynos_dp_read_bytes_from_i2c(regs,
I2C_EDID_DEVICE_ADDR,
EDID_BLOCK_LENGTH,
EDID_BLOCK_LENGTH,
&edid[EDID_BLOCK_LENGTH]);
if (retval != 0) {
printf("DP EDID Read failed!\n");
return -1;
}
sum = exynos_dp_calc_edid_check_sum(&edid[EDID_BLOCK_LENGTH]);
if (sum != 0) {
printf("DP EDID bad checksum!\n");
return -1;
}
exynos_dp_read_byte_from_dpcd(regs, DPCD_TEST_REQUEST,
&test_vector);
if (test_vector & DPCD_TEST_EDID_READ) {
exynos_dp_write_byte_to_dpcd(regs,
DPCD_TEST_EDID_CHECKSUM,
edid[EDID_BLOCK_LENGTH + EDID_CHECKSUM]);
exynos_dp_write_byte_to_dpcd(regs,
DPCD_TEST_RESPONSE,
DPCD_TEST_EDID_CHECKSUM_WRITE);
}
} else {
debug("DP EDID data does not include any extensions.\n");
/* Read EDID data */
retval = exynos_dp_read_bytes_from_i2c(regs,
I2C_EDID_DEVICE_ADDR,
EDID_HEADER_PATTERN,
EDID_BLOCK_LENGTH,
&edid[EDID_HEADER_PATTERN]);
if (retval != 0) {
printf("DP EDID Read failed!\n");
return -1;
}
sum = exynos_dp_calc_edid_check_sum(edid);
if (sum != 0) {
printf("DP EDID bad checksum!\n");
return -1;
}
exynos_dp_read_byte_from_dpcd(regs, DPCD_TEST_REQUEST,
&test_vector);
if (test_vector & DPCD_TEST_EDID_READ) {
exynos_dp_write_byte_to_dpcd(regs,
DPCD_TEST_EDID_CHECKSUM, edid[EDID_CHECKSUM]);
exynos_dp_write_byte_to_dpcd(regs,
DPCD_TEST_RESPONSE,
DPCD_TEST_EDID_CHECKSUM_WRITE);
}
}
debug("DP EDID Read success!\n");
return 0;
}
static unsigned int exynos_dp_handle_edid(struct exynos_dp *regs,
struct exynos_dp_priv *priv)
{
unsigned char buf[12];
unsigned int ret;
unsigned char temp;
unsigned char retry_cnt;
unsigned char dpcd_rev[16];
unsigned char lane_bw[16];
unsigned char lane_cnt[16];
memset(dpcd_rev, 0, 16);
memset(lane_bw, 0, 16);
memset(lane_cnt, 0, 16);
memset(buf, 0, 12);
retry_cnt = 5;
while (retry_cnt) {
/* Read DPCD 0x0000-0x000b */
ret = exynos_dp_read_bytes_from_dpcd(regs, DPCD_DPCD_REV, 12,
buf);
if (ret != EXYNOS_DP_SUCCESS) {
if (retry_cnt == 0) {
printf("DP read_byte_from_dpcd() failed\n");
return ret;
}
retry_cnt--;
} else
break;
}
/* */
temp = buf[DPCD_DPCD_REV];
if (temp == DP_DPCD_REV_10 || temp == DP_DPCD_REV_11)
priv->dpcd_rev = temp;
else {
printf("DP Wrong DPCD Rev : %x\n", temp);
return -ENODEV;
}
temp = buf[DPCD_MAX_LINK_RATE];
if (temp == DP_LANE_BW_1_62 || temp == DP_LANE_BW_2_70)
priv->lane_bw = temp;
else {
printf("DP Wrong MAX LINK RATE : %x\n", temp);
return -EINVAL;
}
/* Refer VESA Display Port Standard Ver1.1a Page 120 */
if (priv->dpcd_rev == DP_DPCD_REV_11) {
temp = buf[DPCD_MAX_LANE_COUNT] & 0x1f;
if (buf[DPCD_MAX_LANE_COUNT] & 0x80)
priv->dpcd_efc = 1;
else
priv->dpcd_efc = 0;
} else {
temp = buf[DPCD_MAX_LANE_COUNT];
priv->dpcd_efc = 0;
}
if (temp == DP_LANE_CNT_1 || temp == DP_LANE_CNT_2 ||
temp == DP_LANE_CNT_4) {
priv->lane_cnt = temp;
} else {
printf("DP Wrong MAX LANE COUNT : %x\n", temp);
return -EINVAL;
}
ret = exynos_dp_read_edid(regs);
if (ret != EXYNOS_DP_SUCCESS) {
printf("DP exynos_dp_read_edid() failed\n");
return -EINVAL;
}
return ret;
}
static void exynos_dp_init_training(struct exynos_dp *regs)
{
/*
* MACRO_RST must be applied after the PLL_LOCK to avoid
* the DP inter pair skew issue for at least 10 us
*/
exynos_dp_reset_macro(regs);
/* All DP analog module power up */
exynos_dp_set_analog_power_down(regs, POWER_ALL, 0);
}
static unsigned int exynos_dp_link_start(struct exynos_dp *regs,
struct exynos_dp_priv *priv)
{
unsigned char buf[5];
unsigned int ret = 0;
debug("DP: %s was called\n", __func__);
priv->lt_info.lt_status = DP_LT_CR;
priv->lt_info.ep_loop = 0;
priv->lt_info.cr_loop[0] = 0;
priv->lt_info.cr_loop[1] = 0;
priv->lt_info.cr_loop[2] = 0;
priv->lt_info.cr_loop[3] = 0;
/* Set sink to D0 (Sink Not Ready) mode. */
ret = exynos_dp_write_byte_to_dpcd(regs, DPCD_SINK_POWER_STATE,
DPCD_SET_POWER_STATE_D0);
if (ret != EXYNOS_DP_SUCCESS) {
printf("DP write_dpcd_byte failed\n");
return ret;
}
/* Set link rate and count as you want to establish */
exynos_dp_set_link_bandwidth(regs, priv->lane_bw);
exynos_dp_set_lane_count(regs, priv->lane_cnt);
/* Setup RX configuration */
buf[0] = priv->lane_bw;
buf[1] = priv->lane_cnt;
ret = exynos_dp_write_bytes_to_dpcd(regs, DPCD_LINK_BW_SET, 2, buf);
if (ret != EXYNOS_DP_SUCCESS) {
printf("DP write_dpcd_byte failed\n");
return ret;
}
exynos_dp_set_lane_pre_emphasis(regs, PRE_EMPHASIS_LEVEL_0,
priv->lane_cnt);
/* Set training pattern 1 */
exynos_dp_set_training_pattern(regs, TRAINING_PTN1);
/* Set RX training pattern */
buf[0] = DPCD_SCRAMBLING_DISABLED | DPCD_TRAINING_PATTERN_1;
buf[1] = DPCD_PRE_EMPHASIS_SET_PATTERN_2_LEVEL_0 |
DPCD_VOLTAGE_SWING_SET_PATTERN_1_LEVEL_0;
buf[2] = DPCD_PRE_EMPHASIS_SET_PATTERN_2_LEVEL_0 |
DPCD_VOLTAGE_SWING_SET_PATTERN_1_LEVEL_0;
buf[3] = DPCD_PRE_EMPHASIS_SET_PATTERN_2_LEVEL_0 |
DPCD_VOLTAGE_SWING_SET_PATTERN_1_LEVEL_0;
buf[4] = DPCD_PRE_EMPHASIS_SET_PATTERN_2_LEVEL_0 |
DPCD_VOLTAGE_SWING_SET_PATTERN_1_LEVEL_0;
ret = exynos_dp_write_bytes_to_dpcd(regs, DPCD_TRAINING_PATTERN_SET,
5, buf);
if (ret != EXYNOS_DP_SUCCESS) {
printf("DP write_dpcd_byte failed\n");
return ret;
}
return ret;
}
static unsigned int exynos_dp_training_pattern_dis(struct exynos_dp *regs)
{
unsigned int ret;
exynos_dp_set_training_pattern(regs, DP_NONE);
ret = exynos_dp_write_byte_to_dpcd(regs, DPCD_TRAINING_PATTERN_SET,
DPCD_TRAINING_PATTERN_DISABLED);
if (ret != EXYNOS_DP_SUCCESS) {
printf("DP request_link_training_req failed\n");
return -EAGAIN;
}
return ret;
}
static unsigned int exynos_dp_enable_rx_to_enhanced_mode(
struct exynos_dp *regs, unsigned char enable)
{
unsigned char data;
unsigned int ret;
ret = exynos_dp_read_byte_from_dpcd(regs, DPCD_LANE_COUNT_SET,
&data);
if (ret != EXYNOS_DP_SUCCESS) {
printf("DP read_from_dpcd failed\n");
return -EAGAIN;
}
if (enable)
data = DPCD_ENHANCED_FRAME_EN | DPCD_LN_COUNT_SET(data);
else
data = DPCD_LN_COUNT_SET(data);
ret = exynos_dp_write_byte_to_dpcd(regs, DPCD_LANE_COUNT_SET, data);
if (ret != EXYNOS_DP_SUCCESS) {
printf("DP write_to_dpcd failed\n");
return -EAGAIN;
}
return ret;
}
static unsigned int exynos_dp_set_enhanced_mode(struct exynos_dp *regs,
unsigned char enhance_mode)
{
unsigned int ret;
ret = exynos_dp_enable_rx_to_enhanced_mode(regs, enhance_mode);
if (ret != EXYNOS_DP_SUCCESS) {
printf("DP rx_enhance_mode failed\n");
return -EAGAIN;
}
exynos_dp_enable_enhanced_mode(regs, enhance_mode);
return ret;
}
static int exynos_dp_read_dpcd_lane_stat(struct exynos_dp *regs,
struct exynos_dp_priv *priv,
unsigned char *status)
{
unsigned int ret, i;
unsigned char buf[2];
unsigned char lane_stat[DP_LANE_CNT_4] = {0,};
unsigned char shift_val[DP_LANE_CNT_4] = {0,};
shift_val[0] = 0;
shift_val[1] = 4;
shift_val[2] = 0;
shift_val[3] = 4;
ret = exynos_dp_read_bytes_from_dpcd(regs, DPCD_LANE0_1_STATUS, 2,
buf);
if (ret != EXYNOS_DP_SUCCESS) {
printf("DP read lane status failed\n");
return ret;
}
for (i = 0; i < priv->lane_cnt; i++) {
lane_stat[i] = (buf[(i / 2)] >> shift_val[i]) & 0x0f;
if (lane_stat[0] != lane_stat[i]) {
printf("Wrong lane status\n");
return -EINVAL;
}
}
*status = lane_stat[0];
return ret;
}
static unsigned int exynos_dp_read_dpcd_adj_req(struct exynos_dp *regs,
unsigned char lane_num, unsigned char *sw, unsigned char *em)
{
unsigned int ret;
unsigned char buf;
unsigned int dpcd_addr;
unsigned char shift_val[DP_LANE_CNT_4] = {0, 4, 0, 4};
/* lane_num value is used as array index, so this range 0 ~ 3 */
dpcd_addr = DPCD_ADJUST_REQUEST_LANE0_1 + (lane_num / 2);
ret = exynos_dp_read_byte_from_dpcd(regs, dpcd_addr, &buf);
if (ret != EXYNOS_DP_SUCCESS) {
printf("DP read adjust request failed\n");
return -EAGAIN;
}
*sw = ((buf >> shift_val[lane_num]) & 0x03);
*em = ((buf >> shift_val[lane_num]) & 0x0c) >> 2;
return ret;
}
static int exynos_dp_equalizer_err_link(struct exynos_dp *regs,
struct exynos_dp_priv *priv)
{
int ret;
ret = exynos_dp_training_pattern_dis(regs);
if (ret != EXYNOS_DP_SUCCESS) {
printf("DP training_pattern_disable() failed\n");
priv->lt_info.lt_status = DP_LT_FAIL;
}
ret = exynos_dp_set_enhanced_mode(regs, priv->dpcd_efc);
if (ret != EXYNOS_DP_SUCCESS) {
printf("DP set_enhanced_mode() failed\n");
priv->lt_info.lt_status = DP_LT_FAIL;
}
return ret;
}
static int exynos_dp_reduce_link_rate(struct exynos_dp *regs,
struct exynos_dp_priv *priv)
{
int ret;
if (priv->lane_bw == DP_LANE_BW_2_70) {
priv->lane_bw = DP_LANE_BW_1_62;
printf("DP Change lane bw to 1.62Gbps\n");
priv->lt_info.lt_status = DP_LT_START;
ret = EXYNOS_DP_SUCCESS;
} else {
ret = exynos_dp_training_pattern_dis(regs);
if (ret != EXYNOS_DP_SUCCESS)
printf("DP training_patter_disable() failed\n");
ret = exynos_dp_set_enhanced_mode(regs, priv->dpcd_efc);
if (ret != EXYNOS_DP_SUCCESS)
printf("DP set_enhanced_mode() failed\n");
priv->lt_info.lt_status = DP_LT_FAIL;
}
return ret;
}
static unsigned int exynos_dp_process_clock_recovery(struct exynos_dp *regs,
struct exynos_dp_priv *priv)
{
unsigned int ret;
unsigned char lane_stat;
unsigned char lt_ctl_val[DP_LANE_CNT_4] = {0, };
unsigned int i;
unsigned char adj_req_sw;
unsigned char adj_req_em;
unsigned char buf[5];
debug("DP: %s was called\n", __func__);
mdelay(1);
ret = exynos_dp_read_dpcd_lane_stat(regs, priv, &lane_stat);
if (ret != EXYNOS_DP_SUCCESS) {
printf("DP read lane status failed\n");
priv->lt_info.lt_status = DP_LT_FAIL;
return ret;
}
if (lane_stat & DP_LANE_STAT_CR_DONE) {
debug("DP clock Recovery training succeed\n");
exynos_dp_set_training_pattern(regs, TRAINING_PTN2);
for (i = 0; i < priv->lane_cnt; i++) {
ret = exynos_dp_read_dpcd_adj_req(regs, i,
&adj_req_sw, &adj_req_em);
if (ret != EXYNOS_DP_SUCCESS) {
priv->lt_info.lt_status = DP_LT_FAIL;
return ret;
}
lt_ctl_val[i] = 0;
lt_ctl_val[i] = adj_req_em << 3 | adj_req_sw;
if ((adj_req_sw == VOLTAGE_LEVEL_3)
|| (adj_req_em == PRE_EMPHASIS_LEVEL_3)) {
lt_ctl_val[i] |= MAX_DRIVE_CURRENT_REACH_3 |
MAX_PRE_EMPHASIS_REACH_3;
}
exynos_dp_set_lanex_pre_emphasis(regs,
lt_ctl_val[i], i);
}
buf[0] = DPCD_SCRAMBLING_DISABLED | DPCD_TRAINING_PATTERN_2;
buf[1] = lt_ctl_val[0];
buf[2] = lt_ctl_val[1];
buf[3] = lt_ctl_val[2];
buf[4] = lt_ctl_val[3];
ret = exynos_dp_write_bytes_to_dpcd(regs,
DPCD_TRAINING_PATTERN_SET, 5, buf);
if (ret != EXYNOS_DP_SUCCESS) {
printf("DP write training pattern1 failed\n");
priv->lt_info.lt_status = DP_LT_FAIL;
return ret;
} else
priv->lt_info.lt_status = DP_LT_ET;
} else {
for (i = 0; i < priv->lane_cnt; i++) {
lt_ctl_val[i] = exynos_dp_get_lanex_pre_emphasis(
regs, i);
ret = exynos_dp_read_dpcd_adj_req(regs, i,
&adj_req_sw, &adj_req_em);
if (ret != EXYNOS_DP_SUCCESS) {
printf("DP read adj req failed\n");
priv->lt_info.lt_status = DP_LT_FAIL;
return ret;
}
if ((adj_req_sw == VOLTAGE_LEVEL_3) ||
(adj_req_em == PRE_EMPHASIS_LEVEL_3))
ret = exynos_dp_reduce_link_rate(regs,
priv);
if ((DRIVE_CURRENT_SET_0_GET(lt_ctl_val[i]) ==
adj_req_sw) &&
(PRE_EMPHASIS_SET_0_GET(lt_ctl_val[i]) ==
adj_req_em)) {
priv->lt_info.cr_loop[i]++;
if (priv->lt_info.cr_loop[i] == MAX_CR_LOOP)
ret = exynos_dp_reduce_link_rate(
regs, priv);
}
lt_ctl_val[i] = 0;
lt_ctl_val[i] = adj_req_em << 3 | adj_req_sw;
if ((adj_req_sw == VOLTAGE_LEVEL_3) ||
(adj_req_em == PRE_EMPHASIS_LEVEL_3)) {
lt_ctl_val[i] |= MAX_DRIVE_CURRENT_REACH_3 |
MAX_PRE_EMPHASIS_REACH_3;
}
exynos_dp_set_lanex_pre_emphasis(regs,
lt_ctl_val[i], i);
}
ret = exynos_dp_write_bytes_to_dpcd(regs,
DPCD_TRAINING_LANE0_SET, 4, lt_ctl_val);
if (ret != EXYNOS_DP_SUCCESS) {
printf("DP write training pattern2 failed\n");
priv->lt_info.lt_status = DP_LT_FAIL;
return ret;
}
}
return ret;
}
static unsigned int exynos_dp_process_equalizer_training(
struct exynos_dp *regs, struct exynos_dp_priv *priv)
{
unsigned int ret;
unsigned char lane_stat, adj_req_sw, adj_req_em, i;
unsigned char lt_ctl_val[DP_LANE_CNT_4] = {0,};
unsigned char interlane_aligned = 0;
unsigned char f_bw;
unsigned char f_lane_cnt;
unsigned char sink_stat;
mdelay(1);
ret = exynos_dp_read_dpcd_lane_stat(regs, priv, &lane_stat);
if (ret != EXYNOS_DP_SUCCESS) {
printf("DP read lane status failed\n");
priv->lt_info.lt_status = DP_LT_FAIL;
return ret;
}
debug("DP lane stat : %x\n", lane_stat);
if (lane_stat & DP_LANE_STAT_CR_DONE) {
ret = exynos_dp_read_byte_from_dpcd(regs,
DPCD_LN_ALIGN_UPDATED,
&sink_stat);
if (ret != EXYNOS_DP_SUCCESS) {
priv->lt_info.lt_status = DP_LT_FAIL;
return ret;
}
interlane_aligned = (sink_stat & DPCD_INTERLANE_ALIGN_DONE);
for (i = 0; i < priv->lane_cnt; i++) {
ret = exynos_dp_read_dpcd_adj_req(regs, i,
&adj_req_sw, &adj_req_em);
if (ret != EXYNOS_DP_SUCCESS) {
printf("DP read adj req 1 failed\n");
priv->lt_info.lt_status = DP_LT_FAIL;
return ret;
}
lt_ctl_val[i] = 0;
lt_ctl_val[i] = adj_req_em << 3 | adj_req_sw;
if ((adj_req_sw == VOLTAGE_LEVEL_3) ||
(adj_req_em == PRE_EMPHASIS_LEVEL_3)) {
lt_ctl_val[i] |= MAX_DRIVE_CURRENT_REACH_3;
lt_ctl_val[i] |= MAX_PRE_EMPHASIS_REACH_3;
}
}
if (((lane_stat&DP_LANE_STAT_CE_DONE) &&
(lane_stat&DP_LANE_STAT_SYM_LOCK))
&& (interlane_aligned == DPCD_INTERLANE_ALIGN_DONE)) {
debug("DP Equalizer training succeed\n");
f_bw = exynos_dp_get_link_bandwidth(regs);
f_lane_cnt = exynos_dp_get_lane_count(regs);
debug("DP final BandWidth : %x\n", f_bw);
debug("DP final Lane Count : %x\n", f_lane_cnt);
priv->lt_info.lt_status = DP_LT_FINISHED;
exynos_dp_equalizer_err_link(regs, priv);
} else {
priv->lt_info.ep_loop++;
if (priv->lt_info.ep_loop > MAX_EQ_LOOP) {
if (priv->lane_bw == DP_LANE_BW_2_70) {
ret = exynos_dp_reduce_link_rate(
regs, priv);
} else {
priv->lt_info.lt_status =
DP_LT_FAIL;
exynos_dp_equalizer_err_link(regs,
priv);
}
} else {
for (i = 0; i < priv->lane_cnt; i++)
exynos_dp_set_lanex_pre_emphasis(
regs, lt_ctl_val[i], i);
ret = exynos_dp_write_bytes_to_dpcd(regs,
DPCD_TRAINING_LANE0_SET,
4, lt_ctl_val);
if (ret != EXYNOS_DP_SUCCESS) {
printf("DP set lt pattern failed\n");
priv->lt_info.lt_status =
DP_LT_FAIL;
exynos_dp_equalizer_err_link(regs,
priv);
}
}
}
} else if (priv->lane_bw == DP_LANE_BW_2_70) {
ret = exynos_dp_reduce_link_rate(regs, priv);
} else {
priv->lt_info.lt_status = DP_LT_FAIL;
exynos_dp_equalizer_err_link(regs, priv);
}
return ret;
}
static unsigned int exynos_dp_sw_link_training(struct exynos_dp *regs,
struct exynos_dp_priv *priv)
{
unsigned int ret = 0;
int training_finished;
/* Turn off unnecessary lane */
if (priv->lane_cnt == 1)
exynos_dp_set_analog_power_down(regs, CH1_BLOCK, 1);
training_finished = 0;
priv->lt_info.lt_status = DP_LT_START;
/* Process here */
while (!training_finished) {
switch (priv->lt_info.lt_status) {
case DP_LT_START:
ret = exynos_dp_link_start(regs, priv);
if (ret != EXYNOS_DP_SUCCESS) {
printf("DP LT:link start failed\n");
return ret;
}
break;
case DP_LT_CR:
ret = exynos_dp_process_clock_recovery(regs,
priv);
if (ret != EXYNOS_DP_SUCCESS) {
printf("DP LT:clock recovery failed\n");
return ret;
}
break;
case DP_LT_ET:
ret = exynos_dp_process_equalizer_training(regs,
priv);
if (ret != EXYNOS_DP_SUCCESS) {
printf("DP LT:equalizer training failed\n");
return ret;
}
break;
case DP_LT_FINISHED:
training_finished = 1;
break;
case DP_LT_FAIL:
return -1;
}
}
return ret;
}
static unsigned int exynos_dp_set_link_train(struct exynos_dp *regs,
struct exynos_dp_priv *priv)
{
unsigned int ret;
exynos_dp_init_training(regs);
ret = exynos_dp_sw_link_training(regs, priv);
if (ret != EXYNOS_DP_SUCCESS)
printf("DP dp_sw_link_training() failed\n");
return ret;
}
static void exynos_dp_enable_scramble(struct exynos_dp *regs,
unsigned int enable)
{
unsigned char data;
if (enable) {
exynos_dp_enable_scrambling(regs, DP_ENABLE);
exynos_dp_read_byte_from_dpcd(regs,
DPCD_TRAINING_PATTERN_SET, &data);
exynos_dp_write_byte_to_dpcd(regs, DPCD_TRAINING_PATTERN_SET,
(u8)(data & ~DPCD_SCRAMBLING_DISABLED));
} else {
exynos_dp_enable_scrambling(regs, DP_DISABLE);
exynos_dp_read_byte_from_dpcd(regs,
DPCD_TRAINING_PATTERN_SET, &data);
exynos_dp_write_byte_to_dpcd(regs, DPCD_TRAINING_PATTERN_SET,
(u8)(data | DPCD_SCRAMBLING_DISABLED));
}
}
static unsigned int exynos_dp_config_video(struct exynos_dp *regs,
struct exynos_dp_priv *priv)
{
unsigned int ret = 0;
unsigned int retry_cnt;
mdelay(1);
if (priv->video_info.master_mode) {
printf("DP does not support master mode\n");
return -ENODEV;
} else {
/* debug slave */
exynos_dp_config_video_slave_mode(regs,
&priv->video_info);
}
exynos_dp_set_video_color_format(regs, &priv->video_info);
if (priv->video_info.bist_mode) {
if (exynos_dp_config_video_bist(regs, priv) != 0)
return -1;
}
ret = exynos_dp_get_pll_lock_status(regs);
if (ret != PLL_LOCKED) {
printf("DP PLL is not locked yet\n");
return -EIO;
}
if (priv->video_info.master_mode == 0) {
retry_cnt = 10;
while (retry_cnt) {
ret = exynos_dp_is_slave_video_stream_clock_on(regs);
if (ret != EXYNOS_DP_SUCCESS) {
if (retry_cnt == 0) {
printf("DP stream_clock_on failed\n");
return ret;
}
retry_cnt--;
mdelay(1);
} else
break;
}
}
/* Set to use the register calculated M/N video */
exynos_dp_set_video_cr_mn(regs, CALCULATED_M, 0, 0);
/* For video bist, Video timing must be generated by register */
exynos_dp_set_video_timing_mode(regs, VIDEO_TIMING_FROM_CAPTURE);
/* Enable video bist */
if (priv->video_info.bist_pattern != COLOR_RAMP &&
priv->video_info.bist_pattern != BALCK_WHITE_V_LINES &&
priv->video_info.bist_pattern != COLOR_SQUARE)
exynos_dp_enable_video_bist(regs,
priv->video_info.bist_mode);
else
exynos_dp_enable_video_bist(regs, DP_DISABLE);
/* Disable video mute */
exynos_dp_enable_video_mute(regs, DP_DISABLE);
/* Configure video Master or Slave mode */
exynos_dp_enable_video_master(regs,
priv->video_info.master_mode);
/* Enable video */
exynos_dp_start_video(regs);
if (priv->video_info.master_mode == 0) {
retry_cnt = 100;
while (retry_cnt) {
ret = exynos_dp_is_video_stream_on(regs);
if (ret != EXYNOS_DP_SUCCESS) {
if (retry_cnt == 0) {
printf("DP Timeout of video stream\n");
return ret;
}
retry_cnt--;
mdelay(5);
} else
break;
}
}
return ret;
}
static int exynos_dp_ofdata_to_platdata(struct udevice *dev)
{
struct exynos_dp_priv *priv = dev_get_priv(dev);
const void *blob = gd->fdt_blob;
unsigned int node = dev_of_offset(dev);
fdt_addr_t addr;
addr = devfdt_get_addr(dev);
if (addr == FDT_ADDR_T_NONE) {
debug("Can't get the DP base address\n");
return -EINVAL;
}
priv->regs = (struct exynos_dp *)addr;
priv->disp_info.h_res = fdtdec_get_int(blob, node,
"samsung,h-res", 0);
priv->disp_info.h_sync_width = fdtdec_get_int(blob, node,
"samsung,h-sync-width", 0);
priv->disp_info.h_back_porch = fdtdec_get_int(blob, node,
"samsung,h-back-porch", 0);
priv->disp_info.h_front_porch = fdtdec_get_int(blob, node,
"samsung,h-front-porch", 0);
priv->disp_info.v_res = fdtdec_get_int(blob, node,
"samsung,v-res", 0);
priv->disp_info.v_sync_width = fdtdec_get_int(blob, node,
"samsung,v-sync-width", 0);
priv->disp_info.v_back_porch = fdtdec_get_int(blob, node,
"samsung,v-back-porch", 0);
priv->disp_info.v_front_porch = fdtdec_get_int(blob, node,
"samsung,v-front-porch", 0);
priv->disp_info.v_sync_rate = fdtdec_get_int(blob, node,
"samsung,v-sync-rate", 0);
priv->lt_info.lt_status = fdtdec_get_int(blob, node,
"samsung,lt-status", 0);
priv->video_info.master_mode = fdtdec_get_int(blob, node,
"samsung,master-mode", 0);
priv->video_info.bist_mode = fdtdec_get_int(blob, node,
"samsung,bist-mode", 0);
priv->video_info.bist_pattern = fdtdec_get_int(blob, node,
"samsung,bist-pattern", 0);
priv->video_info.h_sync_polarity = fdtdec_get_int(blob, node,
"samsung,h-sync-polarity", 0);
priv->video_info.v_sync_polarity = fdtdec_get_int(blob, node,
"samsung,v-sync-polarity", 0);
priv->video_info.interlaced = fdtdec_get_int(blob, node,
"samsung,interlaced", 0);
priv->video_info.color_space = fdtdec_get_int(blob, node,
"samsung,color-space", 0);
priv->video_info.dynamic_range = fdtdec_get_int(blob, node,
"samsung,dynamic-range", 0);
priv->video_info.ycbcr_coeff = fdtdec_get_int(blob, node,
"samsung,ycbcr-coeff", 0);
priv->video_info.color_depth = fdtdec_get_int(blob, node,
"samsung,color-depth", 0);
return 0;
}
static int exynos_dp_bridge_init(struct udevice *dev)
{
const int max_tries = 10;
int num_tries;
int ret;
debug("%s\n", __func__);
ret = video_bridge_attach(dev);
if (ret) {
debug("video bridge init failed: %d\n", ret);
return ret;
}
/*
* We need to wait for 90ms after bringing up the bridge since there
* is a phantom "high" on the HPD chip during its bootup. The phantom
* high comes within 7ms of de-asserting PD and persists for at least
* 15ms. The real high comes roughly 50ms after PD is de-asserted. The
* phantom high makes it hard for us to know when the NXP chip is up.
*/
mdelay(90);
for (num_tries = 0; num_tries < max_tries; num_tries++) {
/* Check HPD. If it's high, or we don't have it, all is well */
ret = video_bridge_check_attached(dev);
if (!ret || ret == -ENOENT)
return 0;
debug("%s: eDP bridge failed to come up; try %d of %d\n",
__func__, num_tries, max_tries);
}
/* Immediately go into bridge reset if the hp line is not high */
return -EIO;
}
static int exynos_dp_bridge_setup(const void *blob)
{
const int max_tries = 2;
int num_tries;
struct udevice *dev;
int ret;
/* Configure I2C registers for Parade bridge */
ret = uclass_get_device(UCLASS_VIDEO_BRIDGE, 0, &dev);
if (ret) {
debug("video bridge init failed: %d\n", ret);
return ret;
}
if (strncmp(dev->driver->name, "parade", 6)) {
/* Mux HPHPD to the special hotplug detect mode */
exynos_pinmux_config(PERIPH_ID_DPHPD, 0);
}
for (num_tries = 0; num_tries < max_tries; num_tries++) {
ret = exynos_dp_bridge_init(dev);
if (!ret)
return 0;
if (num_tries == max_tries - 1)
break;
/*
* If we're here, the bridge chip failed to initialise.
* Power down the bridge in an attempt to reset.
*/
video_bridge_set_active(dev, false);
/*
* Arbitrarily wait 300ms here with DP_N low. Don't know for
* sure how long we should wait, but we're being paranoid.
*/
mdelay(300);
}
return ret;
}
int exynos_dp_enable(struct udevice *dev, int panel_bpp,
const struct display_timing *timing)
{
struct exynos_dp_priv *priv = dev_get_priv(dev);
struct exynos_dp *regs = priv->regs;
unsigned int ret;
debug("%s: start\n", __func__);
exynos_dp_disp_info(&priv->disp_info);
ret = exynos_dp_bridge_setup(gd->fdt_blob);
if (ret && ret != -ENODEV)
printf("LCD bridge failed to enable: %d\n", ret);
exynos_dp_phy_ctrl(1);
ret = exynos_dp_init_dp(regs);
if (ret != EXYNOS_DP_SUCCESS) {
printf("DP exynos_dp_init_dp() failed\n");
return ret;
}
ret = exynos_dp_handle_edid(regs, priv);
if (ret != EXYNOS_DP_SUCCESS) {
printf("EDP handle_edid fail\n");
return ret;
}
ret = exynos_dp_set_link_train(regs, priv);
if (ret != EXYNOS_DP_SUCCESS) {
printf("DP link training fail\n");
return ret;
}
exynos_dp_enable_scramble(regs, DP_ENABLE);
exynos_dp_enable_rx_to_enhanced_mode(regs, DP_ENABLE);
exynos_dp_enable_enhanced_mode(regs, DP_ENABLE);
exynos_dp_set_link_bandwidth(regs, priv->lane_bw);
exynos_dp_set_lane_count(regs, priv->lane_cnt);
exynos_dp_init_video(regs);
ret = exynos_dp_config_video(regs, priv);
if (ret != EXYNOS_DP_SUCCESS) {
printf("Exynos DP init failed\n");
return ret;
}
debug("Exynos DP init done\n");
return ret;
}
static const struct dm_display_ops exynos_dp_ops = {
.enable = exynos_dp_enable,
};
static const struct udevice_id exynos_dp_ids[] = {
{ .compatible = "samsung,exynos5-dp" },
{ }
};
U_BOOT_DRIVER(exynos_dp) = {
.name = "exynos_dp",
.id = UCLASS_DISPLAY,
.of_match = exynos_dp_ids,
.ops = &exynos_dp_ops,
.ofdata_to_platdata = exynos_dp_ofdata_to_platdata,
.priv_auto_alloc_size = sizeof(struct exynos_dp_priv),
};