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linux/drivers/video/exynos/exynos_dp_core.c
Sean Paul fadec4b7e5 video: exynos_dp: Clean up SW link training 
Clean up some of the SW training code to make it more clear and reduce
duplicate code.

[jg1.han@samsung.com: used exynos_dp_write_bytes_to_dpcd()]
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Jingoo Han <jg1.han@samsung.com>
2012-11-29 10:33:27 +09:00

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/*
* Samsung SoC DP (Display Port) interface driver.
*
* Copyright (C) 2012 Samsung Electronics Co., Ltd.
* Author: Jingoo Han <jg1.han@samsung.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*/
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/of.h>
#include <video/exynos_dp.h>
#include "exynos_dp_core.h"
static int exynos_dp_init_dp(struct exynos_dp_device *dp)
{
exynos_dp_reset(dp);
exynos_dp_swreset(dp);
exynos_dp_init_analog_param(dp);
exynos_dp_init_interrupt(dp);
/* SW defined function Normal operation */
exynos_dp_enable_sw_function(dp);
exynos_dp_config_interrupt(dp);
exynos_dp_init_analog_func(dp);
exynos_dp_init_hpd(dp);
exynos_dp_init_aux(dp);
return 0;
}
static int exynos_dp_detect_hpd(struct exynos_dp_device *dp)
{
int timeout_loop = 0;
exynos_dp_init_hpd(dp);
usleep_range(200, 210);
while (exynos_dp_get_plug_in_status(dp) != 0) {
timeout_loop++;
if (DP_TIMEOUT_LOOP_COUNT < timeout_loop) {
dev_err(dp->dev, "failed to get hpd plug status\n");
return -ETIMEDOUT;
}
usleep_range(10, 11);
}
return 0;
}
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 int exynos_dp_read_edid(struct exynos_dp_device *dp)
{
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, I2C_EDID_DEVICE_ADDR,
EDID_EXTENSION_FLAG,
&extend_block);
if (extend_block > 0) {
dev_dbg(dp->dev, "EDID data includes a single extension!\n");
/* Read EDID data */
retval = exynos_dp_read_bytes_from_i2c(dp, I2C_EDID_DEVICE_ADDR,
EDID_HEADER_PATTERN,
EDID_BLOCK_LENGTH,
&edid[EDID_HEADER_PATTERN]);
if (retval != 0) {
dev_err(dp->dev, "EDID Read failed!\n");
return -EIO;
}
sum = exynos_dp_calc_edid_check_sum(edid);
if (sum != 0) {
dev_err(dp->dev, "EDID bad checksum!\n");
return -EIO;
}
/* Read additional EDID data */
retval = exynos_dp_read_bytes_from_i2c(dp,
I2C_EDID_DEVICE_ADDR,
EDID_BLOCK_LENGTH,
EDID_BLOCK_LENGTH,
&edid[EDID_BLOCK_LENGTH]);
if (retval != 0) {
dev_err(dp->dev, "EDID Read failed!\n");
return -EIO;
}
sum = exynos_dp_calc_edid_check_sum(&edid[EDID_BLOCK_LENGTH]);
if (sum != 0) {
dev_err(dp->dev, "EDID bad checksum!\n");
return -EIO;
}
exynos_dp_read_byte_from_dpcd(dp, DPCD_ADDR_TEST_REQUEST,
&test_vector);
if (test_vector & DPCD_TEST_EDID_READ) {
exynos_dp_write_byte_to_dpcd(dp,
DPCD_ADDR_TEST_EDID_CHECKSUM,
edid[EDID_BLOCK_LENGTH + EDID_CHECKSUM]);
exynos_dp_write_byte_to_dpcd(dp,
DPCD_ADDR_TEST_RESPONSE,
DPCD_TEST_EDID_CHECKSUM_WRITE);
}
} else {
dev_info(dp->dev, "EDID data does not include any extensions.\n");
/* Read EDID data */
retval = exynos_dp_read_bytes_from_i2c(dp,
I2C_EDID_DEVICE_ADDR,
EDID_HEADER_PATTERN,
EDID_BLOCK_LENGTH,
&edid[EDID_HEADER_PATTERN]);
if (retval != 0) {
dev_err(dp->dev, "EDID Read failed!\n");
return -EIO;
}
sum = exynos_dp_calc_edid_check_sum(edid);
if (sum != 0) {
dev_err(dp->dev, "EDID bad checksum!\n");
return -EIO;
}
exynos_dp_read_byte_from_dpcd(dp,
DPCD_ADDR_TEST_REQUEST,
&test_vector);
if (test_vector & DPCD_TEST_EDID_READ) {
exynos_dp_write_byte_to_dpcd(dp,
DPCD_ADDR_TEST_EDID_CHECKSUM,
edid[EDID_CHECKSUM]);
exynos_dp_write_byte_to_dpcd(dp,
DPCD_ADDR_TEST_RESPONSE,
DPCD_TEST_EDID_CHECKSUM_WRITE);
}
}
dev_err(dp->dev, "EDID Read success!\n");
return 0;
}
static int exynos_dp_handle_edid(struct exynos_dp_device *dp)
{
u8 buf[12];
int i;
int retval;
/* Read DPCD DPCD_ADDR_DPCD_REV~RECEIVE_PORT1_CAP_1 */
exynos_dp_read_bytes_from_dpcd(dp,
DPCD_ADDR_DPCD_REV,
12, buf);
/* Read EDID */
for (i = 0; i < 3; i++) {
retval = exynos_dp_read_edid(dp);
if (retval == 0)
break;
}
return retval;
}
static void exynos_dp_enable_rx_to_enhanced_mode(struct exynos_dp_device *dp,
bool enable)
{
u8 data;
exynos_dp_read_byte_from_dpcd(dp, DPCD_ADDR_LANE_COUNT_SET, &data);
if (enable)
exynos_dp_write_byte_to_dpcd(dp, DPCD_ADDR_LANE_COUNT_SET,
DPCD_ENHANCED_FRAME_EN |
DPCD_LANE_COUNT_SET(data));
else
exynos_dp_write_byte_to_dpcd(dp, DPCD_ADDR_LANE_COUNT_SET,
DPCD_LANE_COUNT_SET(data));
}
static int exynos_dp_is_enhanced_mode_available(struct exynos_dp_device *dp)
{
u8 data;
int retval;
exynos_dp_read_byte_from_dpcd(dp, DPCD_ADDR_MAX_LANE_COUNT, &data);
retval = DPCD_ENHANCED_FRAME_CAP(data);
return retval;
}
static void exynos_dp_set_enhanced_mode(struct exynos_dp_device *dp)
{
u8 data;
data = exynos_dp_is_enhanced_mode_available(dp);
exynos_dp_enable_rx_to_enhanced_mode(dp, data);
exynos_dp_enable_enhanced_mode(dp, data);
}
static void exynos_dp_training_pattern_dis(struct exynos_dp_device *dp)
{
exynos_dp_set_training_pattern(dp, DP_NONE);
exynos_dp_write_byte_to_dpcd(dp,
DPCD_ADDR_TRAINING_PATTERN_SET,
DPCD_TRAINING_PATTERN_DISABLED);
}
static void exynos_dp_set_lane_lane_pre_emphasis(struct exynos_dp_device *dp,
int pre_emphasis, int lane)
{
switch (lane) {
case 0:
exynos_dp_set_lane0_pre_emphasis(dp, pre_emphasis);
break;
case 1:
exynos_dp_set_lane1_pre_emphasis(dp, pre_emphasis);
break;
case 2:
exynos_dp_set_lane2_pre_emphasis(dp, pre_emphasis);
break;
case 3:
exynos_dp_set_lane3_pre_emphasis(dp, pre_emphasis);
break;
}
}
static int exynos_dp_link_start(struct exynos_dp_device *dp)
{
u8 buf[4];
int lane, lane_count, retval;
lane_count = dp->link_train.lane_count;
dp->link_train.lt_state = CLOCK_RECOVERY;
dp->link_train.eq_loop = 0;
for (lane = 0; lane < lane_count; lane++)
dp->link_train.cr_loop[lane] = 0;
/* Set sink to D0 (Sink Not Ready) mode. */
retval = exynos_dp_write_byte_to_dpcd(dp, DPCD_ADDR_SINK_POWER_STATE,
DPCD_SET_POWER_STATE_D0);
if (retval)
return retval;
/* Set link rate and count as you want to establish*/
exynos_dp_set_link_bandwidth(dp, dp->link_train.link_rate);
exynos_dp_set_lane_count(dp, dp->link_train.lane_count);
/* Setup RX configuration */
buf[0] = dp->link_train.link_rate;
buf[1] = dp->link_train.lane_count;
retval = exynos_dp_write_bytes_to_dpcd(dp, DPCD_ADDR_LINK_BW_SET,
2, buf);
if (retval)
return retval;
/* Set TX pre-emphasis to minimum */
for (lane = 0; lane < lane_count; lane++)
exynos_dp_set_lane_lane_pre_emphasis(dp,
PRE_EMPHASIS_LEVEL_0, lane);
/* Set training pattern 1 */
exynos_dp_set_training_pattern(dp, TRAINING_PTN1);
/* Set RX training pattern */
retval = exynos_dp_write_byte_to_dpcd(dp,
DPCD_ADDR_TRAINING_PATTERN_SET,
DPCD_SCRAMBLING_DISABLED | DPCD_TRAINING_PATTERN_1);
if (retval)
return retval;
for (lane = 0; lane < lane_count; lane++)
buf[lane] = DPCD_PRE_EMPHASIS_PATTERN2_LEVEL0 |
DPCD_VOLTAGE_SWING_PATTERN1_LEVEL0;
retval = exynos_dp_write_bytes_to_dpcd(dp, DPCD_ADDR_TRAINING_LANE0_SET,
lane_count, buf);
return retval;
}
static unsigned char exynos_dp_get_lane_status(u8 link_status[2], int lane)
{
int shift = (lane & 1) * 4;
u8 link_value = link_status[lane>>1];
return (link_value >> shift) & 0xf;
}
static int exynos_dp_clock_recovery_ok(u8 link_status[2], int lane_count)
{
int lane;
u8 lane_status;
for (lane = 0; lane < lane_count; lane++) {
lane_status = exynos_dp_get_lane_status(link_status, lane);
if ((lane_status & DPCD_LANE_CR_DONE) == 0)
return -EINVAL;
}
return 0;
}
static int exynos_dp_channel_eq_ok(u8 link_status[2], u8 link_align,
int lane_count)
{
int lane;
u8 lane_status;
if ((link_align & DPCD_INTERLANE_ALIGN_DONE) == 0)
return -EINVAL;
for (lane = 0; lane < lane_count; lane++) {
lane_status = exynos_dp_get_lane_status(link_status, lane);
lane_status &= DPCD_CHANNEL_EQ_BITS;
if (lane_status != DPCD_CHANNEL_EQ_BITS)
return -EINVAL;
}
return 0;
}
static unsigned char exynos_dp_get_adjust_request_voltage(u8 adjust_request[2],
int lane)
{
int shift = (lane & 1) * 4;
u8 link_value = adjust_request[lane>>1];
return (link_value >> shift) & 0x3;
}
static unsigned char exynos_dp_get_adjust_request_pre_emphasis(
u8 adjust_request[2],
int lane)
{
int shift = (lane & 1) * 4;
u8 link_value = adjust_request[lane>>1];
return ((link_value >> shift) & 0xc) >> 2;
}
static void exynos_dp_set_lane_link_training(struct exynos_dp_device *dp,
u8 training_lane_set, int lane)
{
switch (lane) {
case 0:
exynos_dp_set_lane0_link_training(dp, training_lane_set);
break;
case 1:
exynos_dp_set_lane1_link_training(dp, training_lane_set);
break;
case 2:
exynos_dp_set_lane2_link_training(dp, training_lane_set);
break;
case 3:
exynos_dp_set_lane3_link_training(dp, training_lane_set);
break;
}
}
static unsigned int exynos_dp_get_lane_link_training(
struct exynos_dp_device *dp,
int lane)
{
u32 reg;
switch (lane) {
case 0:
reg = exynos_dp_get_lane0_link_training(dp);
break;
case 1:
reg = exynos_dp_get_lane1_link_training(dp);
break;
case 2:
reg = exynos_dp_get_lane2_link_training(dp);
break;
case 3:
reg = exynos_dp_get_lane3_link_training(dp);
break;
default:
WARN_ON(1);
return 0;
}
return reg;
}
static void exynos_dp_reduce_link_rate(struct exynos_dp_device *dp)
{
exynos_dp_training_pattern_dis(dp);
exynos_dp_set_enhanced_mode(dp);
dp->link_train.lt_state = FAILED;
}
static void exynos_dp_get_adjust_training_lane(struct exynos_dp_device *dp,
u8 adjust_request[2])
{
int lane, lane_count;
u8 voltage_swing, pre_emphasis, training_lane;
lane_count = dp->link_train.lane_count;
for (lane = 0; lane < lane_count; lane++) {
voltage_swing = exynos_dp_get_adjust_request_voltage(
adjust_request, lane);
pre_emphasis = exynos_dp_get_adjust_request_pre_emphasis(
adjust_request, lane);
training_lane = DPCD_VOLTAGE_SWING_SET(voltage_swing) |
DPCD_PRE_EMPHASIS_SET(pre_emphasis);
if (voltage_swing == VOLTAGE_LEVEL_3)
training_lane |= DPCD_MAX_SWING_REACHED;
if (pre_emphasis == PRE_EMPHASIS_LEVEL_3)
training_lane |= DPCD_MAX_PRE_EMPHASIS_REACHED;
dp->link_train.training_lane[lane] = training_lane;
}
}
static int exynos_dp_process_clock_recovery(struct exynos_dp_device *dp)
{
int lane, lane_count, retval;
u8 voltage_swing, pre_emphasis, training_lane;
u8 link_status[2], adjust_request[2];
usleep_range(100, 101);
lane_count = dp->link_train.lane_count;
retval = exynos_dp_read_bytes_from_dpcd(dp,
DPCD_ADDR_LANE0_1_STATUS, 2, link_status);
if (retval)
return retval;
retval = exynos_dp_read_bytes_from_dpcd(dp,
DPCD_ADDR_ADJUST_REQUEST_LANE0_1, 2, adjust_request);
if (retval)
return retval;
if (exynos_dp_clock_recovery_ok(link_status, lane_count) == 0) {
/* set training pattern 2 for EQ */
exynos_dp_set_training_pattern(dp, TRAINING_PTN2);
retval = exynos_dp_write_byte_to_dpcd(dp,
DPCD_ADDR_TRAINING_PATTERN_SET,
DPCD_SCRAMBLING_DISABLED |
DPCD_TRAINING_PATTERN_2);
if (retval)
return retval;
dev_info(dp->dev, "Link Training Clock Recovery success\n");
dp->link_train.lt_state = EQUALIZER_TRAINING;
} else {
for (lane = 0; lane < lane_count; lane++) {
training_lane = exynos_dp_get_lane_link_training(
dp, lane);
voltage_swing = exynos_dp_get_adjust_request_voltage(
adjust_request, lane);
pre_emphasis = exynos_dp_get_adjust_request_pre_emphasis(
adjust_request, lane);
if (DPCD_VOLTAGE_SWING_GET(training_lane) ==
voltage_swing &&
DPCD_PRE_EMPHASIS_GET(training_lane) ==
pre_emphasis)
dp->link_train.cr_loop[lane]++;
if (dp->link_train.cr_loop[lane] == MAX_CR_LOOP ||
voltage_swing == VOLTAGE_LEVEL_3 ||
pre_emphasis == PRE_EMPHASIS_LEVEL_3) {
dev_err(dp->dev, "CR Max reached (%d,%d,%d)\n",
dp->link_train.cr_loop[lane],
voltage_swing, pre_emphasis);
exynos_dp_reduce_link_rate(dp);
return -EIO;
}
}
}
exynos_dp_get_adjust_training_lane(dp, adjust_request);
for (lane = 0; lane < lane_count; lane++)
exynos_dp_set_lane_link_training(dp,
dp->link_train.training_lane[lane], lane);
retval = exynos_dp_write_bytes_to_dpcd(dp,
DPCD_ADDR_TRAINING_LANE0_SET, lane_count,
dp->link_train.training_lane);
if (retval)
return retval;
return retval;
}
static int exynos_dp_process_equalizer_training(struct exynos_dp_device *dp)
{
int lane, lane_count, retval;
u32 reg;
u8 link_align, link_status[2], adjust_request[2];
usleep_range(400, 401);
lane_count = dp->link_train.lane_count;
retval = exynos_dp_read_bytes_from_dpcd(dp,
DPCD_ADDR_LANE0_1_STATUS, 2, link_status);
if (retval)
return retval;
if (exynos_dp_clock_recovery_ok(link_status, lane_count)) {
exynos_dp_reduce_link_rate(dp);
return -EIO;
}
retval = exynos_dp_read_bytes_from_dpcd(dp,
DPCD_ADDR_ADJUST_REQUEST_LANE0_1, 2, adjust_request);
if (retval)
return retval;
retval = exynos_dp_read_byte_from_dpcd(dp,
DPCD_ADDR_LANE_ALIGN_STATUS_UPDATED, &link_align);
if (retval)
return retval;
exynos_dp_get_adjust_training_lane(dp, adjust_request);
if (!exynos_dp_channel_eq_ok(link_status, link_align, lane_count)) {
/* traing pattern Set to Normal */
exynos_dp_training_pattern_dis(dp);
dev_info(dp->dev, "Link Training success!\n");
exynos_dp_get_link_bandwidth(dp, &reg);
dp->link_train.link_rate = reg;
dev_dbg(dp->dev, "final bandwidth = %.2x\n",
dp->link_train.link_rate);
exynos_dp_get_lane_count(dp, &reg);
dp->link_train.lane_count = reg;
dev_dbg(dp->dev, "final lane count = %.2x\n",
dp->link_train.lane_count);
/* set enhanced mode if available */
exynos_dp_set_enhanced_mode(dp);
dp->link_train.lt_state = FINISHED;
return 0;
}
/* not all locked */
dp->link_train.eq_loop++;
if (dp->link_train.eq_loop > MAX_EQ_LOOP) {
dev_err(dp->dev, "EQ Max loop\n");
exynos_dp_reduce_link_rate(dp);
return -EIO;
}
for (lane = 0; lane < lane_count; lane++)
exynos_dp_set_lane_link_training(dp,
dp->link_train.training_lane[lane], lane);
retval = exynos_dp_write_bytes_to_dpcd(dp, DPCD_ADDR_TRAINING_LANE0_SET,
lane_count, dp->link_train.training_lane);
return retval;
}
static void exynos_dp_get_max_rx_bandwidth(struct exynos_dp_device *dp,
u8 *bandwidth)
{
u8 data;
/*
* For DP rev.1.1, Maximum link rate of Main Link lanes
* 0x06 = 1.62 Gbps, 0x0a = 2.7 Gbps
*/
exynos_dp_read_byte_from_dpcd(dp, DPCD_ADDR_MAX_LINK_RATE, &data);
*bandwidth = data;
}
static void exynos_dp_get_max_rx_lane_count(struct exynos_dp_device *dp,
u8 *lane_count)
{
u8 data;
/*
* For DP rev.1.1, Maximum number of Main Link lanes
* 0x01 = 1 lane, 0x02 = 2 lanes, 0x04 = 4 lanes
*/
exynos_dp_read_byte_from_dpcd(dp, DPCD_ADDR_MAX_LANE_COUNT, &data);
*lane_count = DPCD_MAX_LANE_COUNT(data);
}
static void exynos_dp_init_training(struct exynos_dp_device *dp,
enum link_lane_count_type max_lane,
enum link_rate_type max_rate)
{
/*
* 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);
/* Initialize by reading RX's DPCD */
exynos_dp_get_max_rx_bandwidth(dp, &dp->link_train.link_rate);
exynos_dp_get_max_rx_lane_count(dp, &dp->link_train.lane_count);
if ((dp->link_train.link_rate != LINK_RATE_1_62GBPS) &&
(dp->link_train.link_rate != LINK_RATE_2_70GBPS)) {
dev_err(dp->dev, "Rx Max Link Rate is abnormal :%x !\n",
dp->link_train.link_rate);
dp->link_train.link_rate = LINK_RATE_1_62GBPS;
}
if (dp->link_train.lane_count == 0) {
dev_err(dp->dev, "Rx Max Lane count is abnormal :%x !\n",
dp->link_train.lane_count);
dp->link_train.lane_count = (u8)LANE_COUNT1;
}
/* Setup TX lane count & rate */
if (dp->link_train.lane_count > max_lane)
dp->link_train.lane_count = max_lane;
if (dp->link_train.link_rate > max_rate)
dp->link_train.link_rate = max_rate;
/* All DP analog module power up */
exynos_dp_set_analog_power_down(dp, POWER_ALL, 0);
}
static int exynos_dp_sw_link_training(struct exynos_dp_device *dp)
{
int retval = 0, training_finished = 0;
dp->link_train.lt_state = START;
/* Process here */
while (!retval && !training_finished) {
switch (dp->link_train.lt_state) {
case START:
retval = exynos_dp_link_start(dp);
if (retval)
dev_err(dp->dev, "LT link start failed!\n");
break;
case CLOCK_RECOVERY:
retval = exynos_dp_process_clock_recovery(dp);
if (retval)
dev_err(dp->dev, "LT CR failed!\n");
break;
case EQUALIZER_TRAINING:
retval = exynos_dp_process_equalizer_training(dp);
if (retval)
dev_err(dp->dev, "LT EQ failed!\n");
break;
case FINISHED:
training_finished = 1;
break;
case FAILED:
return -EREMOTEIO;
}
}
if (retval)
dev_err(dp->dev, "eDP link training failed (%d)\n", retval);
return retval;
}
static int exynos_dp_set_link_train(struct exynos_dp_device *dp,
u32 count,
u32 bwtype)
{
int i;
int retval;
for (i = 0; i < DP_TIMEOUT_LOOP_COUNT; i++) {
exynos_dp_init_training(dp, count, bwtype);
retval = exynos_dp_sw_link_training(dp);
if (retval == 0)
break;
usleep_range(100, 110);
}
return retval;
}
static int exynos_dp_config_video(struct exynos_dp_device *dp,
struct video_info *video_info)
{
int retval = 0;
int timeout_loop = 0;
int done_count = 0;
exynos_dp_config_video_slave_mode(dp, video_info);
exynos_dp_set_video_color_format(dp, video_info->color_depth,
video_info->color_space,
video_info->dynamic_range,
video_info->ycbcr_coeff);
if (exynos_dp_get_pll_lock_status(dp) == PLL_UNLOCKED) {
dev_err(dp->dev, "PLL is not locked yet.\n");
return -EINVAL;
}
for (;;) {
timeout_loop++;
if (exynos_dp_is_slave_video_stream_clock_on(dp) == 0)
break;
if (DP_TIMEOUT_LOOP_COUNT < timeout_loop) {
dev_err(dp->dev, "Timeout of video streamclk ok\n");
return -ETIMEDOUT;
}
usleep_range(1, 2);
}
/* Set to use the register calculated M/N video */
exynos_dp_set_video_cr_mn(dp, CALCULATED_M, 0, 0);
/* For video bist, Video timing must be generated by register */
exynos_dp_set_video_timing_mode(dp, VIDEO_TIMING_FROM_CAPTURE);
/* Disable video mute */
exynos_dp_enable_video_mute(dp, 0);
/* Configure video slave mode */
exynos_dp_enable_video_master(dp, 0);
/* Enable video */
exynos_dp_start_video(dp);
timeout_loop = 0;
for (;;) {
timeout_loop++;
if (exynos_dp_is_video_stream_on(dp) == 0) {
done_count++;
if (done_count > 10)
break;
} else if (done_count) {
done_count = 0;
}
if (DP_TIMEOUT_LOOP_COUNT < timeout_loop) {
dev_err(dp->dev, "Timeout of video streamclk ok\n");
return -ETIMEDOUT;
}
usleep_range(1000, 1001);
}
if (retval != 0)
dev_err(dp->dev, "Video stream is not detected!\n");
return retval;
}
static void exynos_dp_enable_scramble(struct exynos_dp_device *dp, bool enable)
{
u8 data;
if (enable) {
exynos_dp_enable_scrambling(dp);
exynos_dp_read_byte_from_dpcd(dp,
DPCD_ADDR_TRAINING_PATTERN_SET,
&data);
exynos_dp_write_byte_to_dpcd(dp,
DPCD_ADDR_TRAINING_PATTERN_SET,
(u8)(data & ~DPCD_SCRAMBLING_DISABLED));
} else {
exynos_dp_disable_scrambling(dp);
exynos_dp_read_byte_from_dpcd(dp,
DPCD_ADDR_TRAINING_PATTERN_SET,
&data);
exynos_dp_write_byte_to_dpcd(dp,
DPCD_ADDR_TRAINING_PATTERN_SET,
(u8)(data | DPCD_SCRAMBLING_DISABLED));
}
}
static irqreturn_t exynos_dp_irq_handler(int irq, void *arg)
{
struct exynos_dp_device *dp = arg;
dev_err(dp->dev, "exynos_dp_irq_handler\n");
return IRQ_HANDLED;
}
#ifdef CONFIG_OF
static struct exynos_dp_platdata *exynos_dp_dt_parse_pdata(struct device *dev)
{
struct device_node *dp_node = dev->of_node;
struct exynos_dp_platdata *pd;
struct video_info *dp_video_config;
pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
if (!pd) {
dev_err(dev, "memory allocation for pdata failed\n");
return ERR_PTR(-ENOMEM);
}
dp_video_config = devm_kzalloc(dev,
sizeof(*dp_video_config), GFP_KERNEL);
if (!dp_video_config) {
dev_err(dev, "memory allocation for video config failed\n");
return ERR_PTR(-ENOMEM);
}
pd->video_info = dp_video_config;
dp_video_config->h_sync_polarity =
of_property_read_bool(dp_node, "hsync-active-high");
dp_video_config->v_sync_polarity =
of_property_read_bool(dp_node, "vsync-active-high");
dp_video_config->interlaced =
of_property_read_bool(dp_node, "interlaced");
if (of_property_read_u32(dp_node, "samsung,color-space",
&dp_video_config->color_space)) {
dev_err(dev, "failed to get color-space\n");
return ERR_PTR(-EINVAL);
}
if (of_property_read_u32(dp_node, "samsung,dynamic-range",
&dp_video_config->dynamic_range)) {
dev_err(dev, "failed to get dynamic-range\n");
return ERR_PTR(-EINVAL);
}
if (of_property_read_u32(dp_node, "samsung,ycbcr-coeff",
&dp_video_config->ycbcr_coeff)) {
dev_err(dev, "failed to get ycbcr-coeff\n");
return ERR_PTR(-EINVAL);
}
if (of_property_read_u32(dp_node, "samsung,color-depth",
&dp_video_config->color_depth)) {
dev_err(dev, "failed to get color-depth\n");
return ERR_PTR(-EINVAL);
}
if (of_property_read_u32(dp_node, "samsung,link-rate",
&dp_video_config->link_rate)) {
dev_err(dev, "failed to get link-rate\n");
return ERR_PTR(-EINVAL);
}
if (of_property_read_u32(dp_node, "samsung,lane-count",
&dp_video_config->lane_count)) {
dev_err(dev, "failed to get lane-count\n");
return ERR_PTR(-EINVAL);
}
return pd;
}
static int exynos_dp_dt_parse_phydata(struct exynos_dp_device *dp)
{
struct device_node *dp_phy_node;
u32 phy_base;
dp_phy_node = of_find_node_by_name(dp->dev->of_node, "dptx-phy");
if (!dp_phy_node) {
dev_err(dp->dev, "could not find dptx-phy node\n");
return -ENODEV;
}
if (of_property_read_u32(dp_phy_node, "reg", &phy_base)) {
dev_err(dp->dev, "faild to get reg for dptx-phy\n");
return -EINVAL;
}
if (of_property_read_u32(dp_phy_node, "samsung,enable-mask",
&dp->enable_mask)) {
dev_err(dp->dev, "faild to get enable-mask for dptx-phy\n");
return -EINVAL;
}
dp->phy_addr = ioremap(phy_base, SZ_4);
if (!dp->phy_addr) {
dev_err(dp->dev, "failed to ioremap dp-phy\n");
return -ENOMEM;
}
return 0;
}
static void exynos_dp_phy_init(struct exynos_dp_device *dp)
{
u32 reg;
reg = __raw_readl(dp->phy_addr);
reg |= dp->enable_mask;
__raw_writel(reg, dp->phy_addr);
}
static void exynos_dp_phy_exit(struct exynos_dp_device *dp)
{
u32 reg;
reg = __raw_readl(dp->phy_addr);
reg &= ~(dp->enable_mask);
__raw_writel(reg, dp->phy_addr);
}
#else
static struct exynos_dp_platdata *exynos_dp_dt_parse_pdata(struct device *dev)
{
return NULL;
}
static int exynos_dp_dt_parse_phydata(struct exynos_dp_device *dp)
{
return -EINVAL;
}
static void exynos_dp_phy_init(struct exynos_dp_device *dp)
{
return;
}
static void exynos_dp_phy_exit(struct exynos_dp_device *dp)
{
return;
}
#endif /* CONFIG_OF */
static int __devinit exynos_dp_probe(struct platform_device *pdev)
{
struct resource *res;
struct exynos_dp_device *dp;
struct exynos_dp_platdata *pdata;
int ret = 0;
dp = devm_kzalloc(&pdev->dev, sizeof(struct exynos_dp_device),
GFP_KERNEL);
if (!dp) {
dev_err(&pdev->dev, "no memory for device data\n");
return -ENOMEM;
}
dp->dev = &pdev->dev;
if (pdev->dev.of_node) {
pdata = exynos_dp_dt_parse_pdata(&pdev->dev);
if (IS_ERR(pdata))
return PTR_ERR(pdata);
ret = exynos_dp_dt_parse_phydata(dp);
if (ret)
return ret;
} else {
pdata = pdev->dev.platform_data;
if (!pdata) {
dev_err(&pdev->dev, "no platform data\n");
return -EINVAL;
}
}
dp->clock = devm_clk_get(&pdev->dev, "dp");
if (IS_ERR(dp->clock)) {
dev_err(&pdev->dev, "failed to get clock\n");
return PTR_ERR(dp->clock);
}
clk_prepare_enable(dp->clock);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
dp->reg_base = devm_request_and_ioremap(&pdev->dev, res);
if (!dp->reg_base) {
dev_err(&pdev->dev, "failed to ioremap\n");
return -ENOMEM;
}
dp->irq = platform_get_irq(pdev, 0);
if (!dp->irq) {
dev_err(&pdev->dev, "failed to get irq\n");
return -ENODEV;
}
ret = devm_request_irq(&pdev->dev, dp->irq, exynos_dp_irq_handler, 0,
"exynos-dp", dp);
if (ret) {
dev_err(&pdev->dev, "failed to request irq\n");
return ret;
}
dp->video_info = pdata->video_info;
if (pdev->dev.of_node) {
if (dp->phy_addr)
exynos_dp_phy_init(dp);
} else {
if (pdata->phy_init)
pdata->phy_init();
}
exynos_dp_init_dp(dp);
ret = exynos_dp_detect_hpd(dp);
if (ret) {
dev_err(&pdev->dev, "unable to detect hpd\n");
return ret;
}
exynos_dp_handle_edid(dp);
ret = exynos_dp_set_link_train(dp, dp->video_info->lane_count,
dp->video_info->link_rate);
if (ret) {
dev_err(&pdev->dev, "unable to do link train\n");
return ret;
}
exynos_dp_enable_scramble(dp, 1);
exynos_dp_enable_rx_to_enhanced_mode(dp, 1);
exynos_dp_enable_enhanced_mode(dp, 1);
exynos_dp_set_lane_count(dp, dp->video_info->lane_count);
exynos_dp_set_link_bandwidth(dp, dp->video_info->link_rate);
exynos_dp_init_video(dp);
ret = exynos_dp_config_video(dp, dp->video_info);
if (ret) {
dev_err(&pdev->dev, "unable to config video\n");
return ret;
}
platform_set_drvdata(pdev, dp);
return 0;
}
static int __devexit exynos_dp_remove(struct platform_device *pdev)
{
struct exynos_dp_platdata *pdata = pdev->dev.platform_data;
struct exynos_dp_device *dp = platform_get_drvdata(pdev);
if (pdev->dev.of_node) {
if (dp->phy_addr)
exynos_dp_phy_exit(dp);
} else {
if (pdata->phy_exit)
pdata->phy_exit();
}
clk_disable_unprepare(dp->clock);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int exynos_dp_suspend(struct device *dev)
{
struct exynos_dp_platdata *pdata = dev->platform_data;
struct exynos_dp_device *dp = dev_get_drvdata(dev);
if (dev->of_node) {
if (dp->phy_addr)
exynos_dp_phy_exit(dp);
} else {
if (pdata->phy_exit)
pdata->phy_exit();
}
clk_disable_unprepare(dp->clock);
return 0;
}
static int exynos_dp_resume(struct device *dev)
{
struct exynos_dp_platdata *pdata = dev->platform_data;
struct exynos_dp_device *dp = dev_get_drvdata(dev);
if (dev->of_node) {
if (dp->phy_addr)
exynos_dp_phy_init(dp);
} else {
if (pdata->phy_init)
pdata->phy_init();
}
clk_prepare_enable(dp->clock);
exynos_dp_init_dp(dp);
exynos_dp_detect_hpd(dp);
exynos_dp_handle_edid(dp);
exynos_dp_set_link_train(dp, dp->video_info->lane_count,
dp->video_info->link_rate);
exynos_dp_enable_scramble(dp, 1);
exynos_dp_enable_rx_to_enhanced_mode(dp, 1);
exynos_dp_enable_enhanced_mode(dp, 1);
exynos_dp_set_lane_count(dp, dp->video_info->lane_count);
exynos_dp_set_link_bandwidth(dp, dp->video_info->link_rate);
exynos_dp_init_video(dp);
exynos_dp_config_video(dp, dp->video_info);
return 0;
}
#endif
static const struct dev_pm_ops exynos_dp_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(exynos_dp_suspend, exynos_dp_resume)
};
static const struct of_device_id exynos_dp_match[] = {
{ .compatible = "samsung,exynos5-dp" },
{},
};
MODULE_DEVICE_TABLE(of, exynos_dp_match);
static struct platform_driver exynos_dp_driver = {
.probe = exynos_dp_probe,
.remove = __devexit_p(exynos_dp_remove),
.driver = {
.name = "exynos-dp",
.owner = THIS_MODULE,
.pm = &exynos_dp_pm_ops,
.of_match_table = of_match_ptr(exynos_dp_match),
},
};
module_platform_driver(exynos_dp_driver);
MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
MODULE_DESCRIPTION("Samsung SoC DP Driver");
MODULE_LICENSE("GPL");
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