blob: 9945c4bcf98e7b93845766241f31641b842d7c76 [file] [log] [blame]
/*
* Copyright (C) 2012 Samsung Electronics
*
* Author: Donghwa Lee <dh09.lee@samsung.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <config.h>
#include <common.h>
#include <malloc.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 <fdtdec.h>
#include <libfdt.h>
#include "exynos_dp_lowlevel.h"
DECLARE_GLOBAL_DATA_PTR;
void __exynos_set_dp_phy(unsigned int onoff)
{
}
void exynos_set_dp_phy(unsigned int onoff)
__attribute__((weak, alias("__exynos_set_dp_phy")));
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 *dp_regs)
{
int ret;
exynos_dp_reset(dp_regs);
/* SW defined function Normal operation */
exynos_dp_enable_sw_func(dp_regs, DP_ENABLE);
ret = exynos_dp_init_analog_func(dp_regs);
if (ret != EXYNOS_DP_SUCCESS)
return ret;
exynos_dp_init_hpd(dp_regs);
exynos_dp_init_aux(dp_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 *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(dp_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(dp_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(dp_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(dp_regs, DPCD_TEST_REQUEST,
&test_vector);
if (test_vector & DPCD_TEST_EDID_READ) {
exynos_dp_write_byte_to_dpcd(dp_regs,
DPCD_TEST_EDID_CHECKSUM,
edid[EDID_BLOCK_LENGTH + EDID_CHECKSUM]);
exynos_dp_write_byte_to_dpcd(dp_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(dp_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(dp_regs, DPCD_TEST_REQUEST,
&test_vector);
if (test_vector & DPCD_TEST_EDID_READ) {
exynos_dp_write_byte_to_dpcd(dp_regs,
DPCD_TEST_EDID_CHECKSUM, edid[EDID_CHECKSUM]);
exynos_dp_write_byte_to_dpcd(dp_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 *dp_regs,
struct edp_device_info *edp_info)
{
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(dp_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)
edp_info->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)
edp_info->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 (edp_info->dpcd_rev == DP_DPCD_REV_11) {
temp = buf[DPCD_MAX_LANE_COUNT] & 0x1f;
if (buf[DPCD_MAX_LANE_COUNT] & 0x80)
edp_info->dpcd_efc = 1;
else
edp_info->dpcd_efc = 0;
} else {
temp = buf[DPCD_MAX_LANE_COUNT];
edp_info->dpcd_efc = 0;
}
if (temp == DP_LANE_CNT_1 || temp == DP_LANE_CNT_2 ||
temp == DP_LANE_CNT_4) {
edp_info->lane_cnt = temp;
} else {
printf("DP Wrong MAX LANE COUNT : %x\n", temp);
return -EINVAL;
}
ret = exynos_dp_read_edid(dp_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 *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(dp_regs);
/* All DP analog module power up */
exynos_dp_set_analog_power_down(dp_regs, POWER_ALL, 0);
}
static unsigned int exynos_dp_link_start(struct exynos_dp *dp_regs,
struct edp_device_info *edp_info)
{
unsigned char buf[5];
unsigned int ret = 0;
debug("DP: %s was called\n", __func__);
edp_info->lt_info.lt_status = DP_LT_CR;
edp_info->lt_info.ep_loop = 0;
edp_info->lt_info.cr_loop[0] = 0;
edp_info->lt_info.cr_loop[1] = 0;
edp_info->lt_info.cr_loop[2] = 0;
edp_info->lt_info.cr_loop[3] = 0;
/* Set sink to D0 (Sink Not Ready) mode. */
ret = exynos_dp_write_byte_to_dpcd(dp_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(dp_regs, edp_info->lane_bw);
exynos_dp_set_lane_count(dp_regs, edp_info->lane_cnt);
/* Setup RX configuration */
buf[0] = edp_info->lane_bw;
buf[1] = edp_info->lane_cnt;
ret = exynos_dp_write_bytes_to_dpcd(dp_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(dp_regs, PRE_EMPHASIS_LEVEL_0,
edp_info->lane_cnt);
/* Set training pattern 1 */
exynos_dp_set_training_pattern(dp_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(dp_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 *dp_regs)
{
unsigned int ret = EXYNOS_DP_SUCCESS;
exynos_dp_set_training_pattern(dp_regs, DP_NONE);
ret = exynos_dp_write_byte_to_dpcd(dp_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 *dp_regs, unsigned char enable)
{
unsigned char data;
unsigned int ret = EXYNOS_DP_SUCCESS;
ret = exynos_dp_read_byte_from_dpcd(dp_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(dp_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 *dp_regs,
unsigned char enhance_mode)
{
unsigned int ret = EXYNOS_DP_SUCCESS;
ret = exynos_dp_enable_rx_to_enhanced_mode(dp_regs, enhance_mode);
if (ret != EXYNOS_DP_SUCCESS) {
printf("DP rx_enhance_mode failed\n");
return -EAGAIN;
}
exynos_dp_enable_enhanced_mode(dp_regs, enhance_mode);
return ret;
}
static int exynos_dp_read_dpcd_lane_stat(struct exynos_dp *dp_regs,
struct edp_device_info *edp_info,
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(dp_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 < edp_info->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 *dp_regs,
unsigned char lane_num, unsigned char *sw, unsigned char *em)
{
unsigned int ret = EXYNOS_DP_SUCCESS;
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(dp_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 *dp_regs,
struct edp_device_info *edp_info)
{
int ret;
ret = exynos_dp_training_pattern_dis(dp_regs);
if (ret != EXYNOS_DP_SUCCESS) {
printf("DP training_pattern_disable() failed\n");
edp_info->lt_info.lt_status = DP_LT_FAIL;
}
ret = exynos_dp_set_enhanced_mode(dp_regs, edp_info->dpcd_efc);
if (ret != EXYNOS_DP_SUCCESS) {
printf("DP set_enhanced_mode() failed\n");
edp_info->lt_info.lt_status = DP_LT_FAIL;
}
return ret;
}
static int exynos_dp_reduce_link_rate(struct exynos_dp *dp_regs,
struct edp_device_info *edp_info)
{
int ret;
if (edp_info->lane_bw == DP_LANE_BW_2_70) {
edp_info->lane_bw = DP_LANE_BW_1_62;
printf("DP Change lane bw to 1.62Gbps\n");
edp_info->lt_info.lt_status = DP_LT_START;
ret = EXYNOS_DP_SUCCESS;
} else {
ret = exynos_dp_training_pattern_dis(dp_regs);
if (ret != EXYNOS_DP_SUCCESS)
printf("DP training_patter_disable() failed\n");
ret = exynos_dp_set_enhanced_mode(dp_regs, edp_info->dpcd_efc);
if (ret != EXYNOS_DP_SUCCESS)
printf("DP set_enhanced_mode() failed\n");
edp_info->lt_info.lt_status = DP_LT_FAIL;
}
return ret;
}
static unsigned int exynos_dp_process_clock_recovery(struct exynos_dp *dp_regs,
struct edp_device_info *edp_info)
{
unsigned int ret = EXYNOS_DP_SUCCESS;
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(dp_regs, edp_info, &lane_stat);
if (ret != EXYNOS_DP_SUCCESS) {
printf("DP read lane status failed\n");
edp_info->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(dp_regs, TRAINING_PTN2);
for (i = 0; i < edp_info->lane_cnt; i++) {
ret = exynos_dp_read_dpcd_adj_req(dp_regs, i,
&adj_req_sw, &adj_req_em);
if (ret != EXYNOS_DP_SUCCESS) {
edp_info->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(dp_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(dp_regs,
DPCD_TRAINING_PATTERN_SET, 5, buf);
if (ret != EXYNOS_DP_SUCCESS) {
printf("DP write training pattern1 failed\n");
edp_info->lt_info.lt_status = DP_LT_FAIL;
return ret;
} else
edp_info->lt_info.lt_status = DP_LT_ET;
} else {
for (i = 0; i < edp_info->lane_cnt; i++) {
lt_ctl_val[i] = exynos_dp_get_lanex_pre_emphasis(
dp_regs, i);
ret = exynos_dp_read_dpcd_adj_req(dp_regs, i,
&adj_req_sw, &adj_req_em);
if (ret != EXYNOS_DP_SUCCESS) {
printf("DP read adj req failed\n");
edp_info->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(dp_regs,
edp_info);
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)) {
edp_info->lt_info.cr_loop[i]++;
if (edp_info->lt_info.cr_loop[i] == MAX_CR_LOOP)
ret = exynos_dp_reduce_link_rate(
dp_regs, edp_info);
}
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(dp_regs,
lt_ctl_val[i], i);
}
ret = exynos_dp_write_bytes_to_dpcd(dp_regs,
DPCD_TRAINING_LANE0_SET, 4, lt_ctl_val);
if (ret != EXYNOS_DP_SUCCESS) {
printf("DP write training pattern2 failed\n");
edp_info->lt_info.lt_status = DP_LT_FAIL;
return ret;
}
}
return ret;
}
static unsigned int exynos_dp_process_equalizer_training(
struct exynos_dp *dp_regs, struct edp_device_info *edp_info)
{
unsigned int ret = EXYNOS_DP_SUCCESS;
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(dp_regs, edp_info, &lane_stat);
if (ret != EXYNOS_DP_SUCCESS) {
printf("DP read lane status failed\n");
edp_info->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(dp_regs,
DPCD_LN_ALIGN_UPDATED,
&sink_stat);
if (ret != EXYNOS_DP_SUCCESS) {
edp_info->lt_info.lt_status = DP_LT_FAIL;
return ret;
}
interlane_aligned = (sink_stat & DPCD_INTERLANE_ALIGN_DONE);
for (i = 0; i < edp_info->lane_cnt; i++) {
ret = exynos_dp_read_dpcd_adj_req(dp_regs, i,
&adj_req_sw, &adj_req_em);
if (ret != EXYNOS_DP_SUCCESS) {
printf("DP read adj req 1 failed\n");
edp_info->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(dp_regs);
f_lane_cnt = exynos_dp_get_lane_count(dp_regs);
debug("DP final BandWidth : %x\n", f_bw);
debug("DP final Lane Count : %x\n", f_lane_cnt);
edp_info->lt_info.lt_status = DP_LT_FINISHED;
exynos_dp_equalizer_err_link(dp_regs, edp_info);
} else {
edp_info->lt_info.ep_loop++;
if (edp_info->lt_info.ep_loop > MAX_EQ_LOOP) {
if (edp_info->lane_bw == DP_LANE_BW_2_70) {
ret = exynos_dp_reduce_link_rate(
dp_regs, edp_info);
} else {
edp_info->lt_info.lt_status =
DP_LT_FAIL;
exynos_dp_equalizer_err_link(dp_regs,
edp_info);
}
} else {
for (i = 0; i < edp_info->lane_cnt; i++)
exynos_dp_set_lanex_pre_emphasis(
dp_regs, lt_ctl_val[i], i);
ret = exynos_dp_write_bytes_to_dpcd(dp_regs,
DPCD_TRAINING_LANE0_SET,
4, lt_ctl_val);
if (ret != EXYNOS_DP_SUCCESS) {
printf("DP set lt pattern failed\n");
edp_info->lt_info.lt_status =
DP_LT_FAIL;
exynos_dp_equalizer_err_link(dp_regs,
edp_info);
}
}
}
} else if (edp_info->lane_bw == DP_LANE_BW_2_70) {
ret = exynos_dp_reduce_link_rate(dp_regs, edp_info);
} else {
edp_info->lt_info.lt_status = DP_LT_FAIL;
exynos_dp_equalizer_err_link(dp_regs, edp_info);
}
return ret;
}
static unsigned int exynos_dp_sw_link_training(struct exynos_dp *dp_regs,
struct edp_device_info *edp_info)
{
unsigned int ret = 0;
int training_finished;
/* Turn off unnecessary lane */
if (edp_info->lane_cnt == 1)
exynos_dp_set_analog_power_down(dp_regs, CH1_BLOCK, 1);
training_finished = 0;
edp_info->lt_info.lt_status = DP_LT_START;
/* Process here */
while (!training_finished) {
switch (edp_info->lt_info.lt_status) {
case DP_LT_START:
ret = exynos_dp_link_start(dp_regs, edp_info);
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(dp_regs,
edp_info);
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(dp_regs,
edp_info);
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 *dp_regs,
struct edp_device_info *edp_info)
{
unsigned int ret;
exynos_dp_init_training(dp_regs);
ret = exynos_dp_sw_link_training(dp_regs, edp_info);
if (ret != EXYNOS_DP_SUCCESS)
printf("DP dp_sw_link_training() failed\n");
return ret;
}
static void exynos_dp_enable_scramble(struct exynos_dp *dp_regs,
unsigned int enable)
{
unsigned char data;
if (enable) {
exynos_dp_enable_scrambling(dp_regs, DP_ENABLE);
exynos_dp_read_byte_from_dpcd(dp_regs,
DPCD_TRAINING_PATTERN_SET, &data);
exynos_dp_write_byte_to_dpcd(dp_regs, DPCD_TRAINING_PATTERN_SET,
(u8)(data & ~DPCD_SCRAMBLING_DISABLED));
} else {
exynos_dp_enable_scrambling(dp_regs, DP_DISABLE);
exynos_dp_read_byte_from_dpcd(dp_regs,
DPCD_TRAINING_PATTERN_SET, &data);
exynos_dp_write_byte_to_dpcd(dp_regs, DPCD_TRAINING_PATTERN_SET,
(u8)(data | DPCD_SCRAMBLING_DISABLED));
}
}
static unsigned int exynos_dp_config_video(struct exynos_dp *dp_regs,
struct edp_device_info *edp_info)
{
unsigned int ret = 0;
unsigned int retry_cnt;
mdelay(1);
if (edp_info->video_info.master_mode) {
printf("DP does not support master mode\n");
return -ENODEV;
} else {
/* debug slave */
exynos_dp_config_video_slave_mode(dp_regs,
&edp_info->video_info);
}
exynos_dp_set_video_color_format(dp_regs, &edp_info->video_info);
if (edp_info->video_info.bist_mode) {
if (exynos_dp_config_video_bist(dp_regs, edp_info) != 0)
return -1;
}
ret = exynos_dp_get_pll_lock_status(dp_regs);
if (ret != PLL_LOCKED) {
printf("DP PLL is not locked yet\n");
return -EIO;
}
if (edp_info->video_info.master_mode == 0) {
retry_cnt = 10;
while (retry_cnt) {
ret = exynos_dp_is_slave_video_stream_clock_on(dp_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(dp_regs, CALCULATED_M, 0, 0);
/* For video bist, Video timing must be generated by register */
exynos_dp_set_video_timing_mode(dp_regs, VIDEO_TIMING_FROM_CAPTURE);
/* Enable video bist */
if (edp_info->video_info.bist_pattern != COLOR_RAMP &&
edp_info->video_info.bist_pattern != BALCK_WHITE_V_LINES &&
edp_info->video_info.bist_pattern != COLOR_SQUARE)
exynos_dp_enable_video_bist(dp_regs,
edp_info->video_info.bist_mode);
else
exynos_dp_enable_video_bist(dp_regs, DP_DISABLE);
/* Disable video mute */
exynos_dp_enable_video_mute(dp_regs, DP_DISABLE);
/* Configure video Master or Slave mode */
exynos_dp_enable_video_master(dp_regs,
edp_info->video_info.master_mode);
/* Enable video */
exynos_dp_start_video(dp_regs);
if (edp_info->video_info.master_mode == 0) {
retry_cnt = 100;
while (retry_cnt) {
ret = exynos_dp_is_video_stream_on(dp_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;
}
int exynos_dp_parse_dt(const void *blob, struct edp_device_info *edp_info)
{
unsigned int node = fdtdec_next_compatible(blob, 0,
COMPAT_SAMSUNG_EXYNOS5_DP);
if (node <= 0) {
debug("exynos_dp: Can't get device node for dp\n");
return -ENODEV;
}
edp_info->disp_info.h_res = fdtdec_get_int(blob, node,
"samsung,h-res", 0);
edp_info->disp_info.h_sync_width = fdtdec_get_int(blob, node,
"samsung,h-sync-width", 0);
edp_info->disp_info.h_back_porch = fdtdec_get_int(blob, node,
"samsung,h-back-porch", 0);
edp_info->disp_info.h_front_porch = fdtdec_get_int(blob, node,
"samsung,h-front-porch", 0);
edp_info->disp_info.v_res = fdtdec_get_int(blob, node,
"samsung,v-res", 0);
edp_info->disp_info.v_sync_width = fdtdec_get_int(blob, node,
"samsung,v-sync-width", 0);
edp_info->disp_info.v_back_porch = fdtdec_get_int(blob, node,
"samsung,v-back-porch", 0);
edp_info->disp_info.v_front_porch = fdtdec_get_int(blob, node,
"samsung,v-front-porch", 0);
edp_info->disp_info.v_sync_rate = fdtdec_get_int(blob, node,
"samsung,v-sync-rate", 0);
edp_info->lt_info.lt_status = fdtdec_get_int(blob, node,
"samsung,lt-status", 0);
edp_info->video_info.master_mode = fdtdec_get_int(blob, node,
"samsung,master-mode", 0);
edp_info->video_info.bist_mode = fdtdec_get_int(blob, node,
"samsung,bist-mode", 0);
edp_info->video_info.bist_pattern = fdtdec_get_int(blob, node,
"samsung,bist-pattern", 0);
edp_info->video_info.h_sync_polarity = fdtdec_get_int(blob, node,
"samsung,h-sync-polarity", 0);
edp_info->video_info.v_sync_polarity = fdtdec_get_int(blob, node,
"samsung,v-sync-polarity", 0);
edp_info->video_info.interlaced = fdtdec_get_int(blob, node,
"samsung,interlaced", 0);
edp_info->video_info.color_space = fdtdec_get_int(blob, node,
"samsung,color-space", 0);
edp_info->video_info.dynamic_range = fdtdec_get_int(blob, node,
"samsung,dynamic-range", 0);
edp_info->video_info.ycbcr_coeff = fdtdec_get_int(blob, node,
"samsung,ycbcr-coeff", 0);
edp_info->video_info.color_depth = fdtdec_get_int(blob, node,
"samsung,color-depth", 0);
return 0;
}
unsigned int exynos_init_dp(void)
{
unsigned int ret;
struct edp_device_info *edp_info;
struct exynos_dp *dp_regs;
int node;
edp_info = kzalloc(sizeof(struct edp_device_info), GFP_KERNEL);
if (!edp_info) {
debug("failed to allocate edp device object.\n");
return -EFAULT;
}
if (exynos_dp_parse_dt(gd->fdt_blob, edp_info))
debug("unable to parse DP DT node\n");
node = fdtdec_next_compatible(gd->fdt_blob, 0,
COMPAT_SAMSUNG_EXYNOS5_DP);
if (node <= 0)
debug("exynos_dp: Can't get device node for dp\n");
dp_regs = (struct exynos_dp *)fdtdec_get_addr(gd->fdt_blob, node,
"reg");
if (dp_regs == NULL)
debug("Can't get the DP base address\n");
exynos_dp_disp_info(&edp_info->disp_info);
exynos_set_dp_phy(1);
ret = exynos_dp_init_dp(dp_regs);
if (ret != EXYNOS_DP_SUCCESS) {
printf("DP exynos_dp_init_dp() failed\n");
return ret;
}
ret = exynos_dp_handle_edid(dp_regs, edp_info);
if (ret != EXYNOS_DP_SUCCESS) {
printf("EDP handle_edid fail\n");
return ret;
}
ret = exynos_dp_set_link_train(dp_regs, edp_info);
if (ret != EXYNOS_DP_SUCCESS) {
printf("DP link training fail\n");
return ret;
}
exynos_dp_enable_scramble(dp_regs, DP_ENABLE);
exynos_dp_enable_rx_to_enhanced_mode(dp_regs, DP_ENABLE);
exynos_dp_enable_enhanced_mode(dp_regs, DP_ENABLE);
exynos_dp_set_link_bandwidth(dp_regs, edp_info->lane_bw);
exynos_dp_set_lane_count(dp_regs, edp_info->lane_cnt);
exynos_dp_init_video(dp_regs);
ret = exynos_dp_config_video(dp_regs, edp_info);
if (ret != EXYNOS_DP_SUCCESS) {
printf("Exynos DP init failed\n");
return ret;
}
debug("Exynos DP init done\n");
return ret;
}