| /* |
| * 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 <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 void exynos_dp_link_start(struct exynos_dp_device *dp) |
| { |
| u8 buf[4]; |
| int lane; |
| int lane_count; |
| |
| 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. */ |
| exynos_dp_write_byte_to_dpcd(dp, DPCD_ADDR_SINK_POWER_STATE, |
| DPCD_SET_POWER_STATE_D0); |
| |
| /* 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; |
| exynos_dp_write_bytes_to_dpcd(dp, DPCD_ADDR_LINK_BW_SET, |
| 2, buf); |
| |
| /* 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 */ |
| exynos_dp_write_byte_to_dpcd(dp, |
| DPCD_ADDR_TRAINING_PATTERN_SET, |
| DPCD_SCRAMBLING_DISABLED | |
| DPCD_TRAINING_PATTERN_1); |
| |
| for (lane = 0; lane < lane_count; lane++) |
| buf[lane] = DPCD_PRE_EMPHASIS_PATTERN2_LEVEL0 | |
| DPCD_VOLTAGE_SWING_PATTERN1_LEVEL0; |
| exynos_dp_write_bytes_to_dpcd(dp, |
| DPCD_ADDR_TRAINING_LANE0_SET, |
| lane_count, buf); |
| } |
| |
| 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_align[3], int lane_count) |
| { |
| int lane; |
| u8 lane_align; |
| u8 lane_status; |
| |
| lane_align = link_align[2]; |
| if ((lane_align & DPCD_INTERLANE_ALIGN_DONE) == 0) |
| return -EINVAL; |
| |
| for (lane = 0; lane < lane_count; lane++) { |
| lane_status = exynos_dp_get_lane_status(link_align, 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 int exynos_dp_process_clock_recovery(struct exynos_dp_device *dp) |
| { |
| u8 link_status[2]; |
| int lane; |
| int lane_count; |
| |
| u8 adjust_request[2]; |
| u8 voltage_swing; |
| u8 pre_emphasis; |
| u8 training_lane; |
| |
| usleep_range(100, 101); |
| |
| lane_count = dp->link_train.lane_count; |
| |
| exynos_dp_read_bytes_from_dpcd(dp, DPCD_ADDR_LANE0_1_STATUS, |
| 2, link_status); |
| |
| 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); |
| |
| for (lane = 0; lane < lane_count; lane++) { |
| exynos_dp_read_bytes_from_dpcd(dp, |
| DPCD_ADDR_ADJUST_REQUEST_LANE0_1, |
| 2, adjust_request); |
| 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; |
| |
| exynos_dp_set_lane_link_training(dp, |
| dp->link_train.training_lane[lane], |
| lane); |
| } |
| |
| exynos_dp_write_byte_to_dpcd(dp, |
| DPCD_ADDR_TRAINING_PATTERN_SET, |
| DPCD_SCRAMBLING_DISABLED | |
| DPCD_TRAINING_PATTERN_2); |
| |
| exynos_dp_write_bytes_to_dpcd(dp, |
| DPCD_ADDR_TRAINING_LANE0_SET, |
| lane_count, |
| dp->link_train.training_lane); |
| |
| 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); |
| exynos_dp_read_bytes_from_dpcd(dp, |
| DPCD_ADDR_ADJUST_REQUEST_LANE0_1, |
| 2, adjust_request); |
| voltage_swing = exynos_dp_get_adjust_request_voltage( |
| adjust_request, lane); |
| pre_emphasis = exynos_dp_get_adjust_request_pre_emphasis( |
| adjust_request, lane); |
| |
| if (voltage_swing == VOLTAGE_LEVEL_3 || |
| pre_emphasis == PRE_EMPHASIS_LEVEL_3) { |
| dev_err(dp->dev, "voltage or pre emphasis reached max level\n"); |
| goto reduce_link_rate; |
| } |
| |
| 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) { |
| dev_err(dp->dev, "CR Max loop\n"); |
| goto reduce_link_rate; |
| } |
| } |
| |
| 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; |
| |
| exynos_dp_set_lane_link_training(dp, |
| dp->link_train.training_lane[lane], lane); |
| } |
| |
| exynos_dp_write_bytes_to_dpcd(dp, |
| DPCD_ADDR_TRAINING_LANE0_SET, |
| lane_count, |
| dp->link_train.training_lane); |
| } |
| |
| return 0; |
| |
| reduce_link_rate: |
| exynos_dp_reduce_link_rate(dp); |
| return -EIO; |
| } |
| |
| static int exynos_dp_process_equalizer_training(struct exynos_dp_device *dp) |
| { |
| u8 link_status[2]; |
| u8 link_align[3]; |
| int lane; |
| int lane_count; |
| u32 reg; |
| |
| u8 adjust_request[2]; |
| u8 voltage_swing; |
| u8 pre_emphasis; |
| u8 training_lane; |
| |
| usleep_range(400, 401); |
| |
| lane_count = dp->link_train.lane_count; |
| |
| exynos_dp_read_bytes_from_dpcd(dp, DPCD_ADDR_LANE0_1_STATUS, |
| 2, link_status); |
| |
| if (exynos_dp_clock_recovery_ok(link_status, lane_count) == 0) { |
| link_align[0] = link_status[0]; |
| link_align[1] = link_status[1]; |
| |
| exynos_dp_read_byte_from_dpcd(dp, |
| DPCD_ADDR_LANE_ALIGN_STATUS_UPDATED, |
| &link_align[2]); |
| |
| for (lane = 0; lane < lane_count; lane++) { |
| exynos_dp_read_bytes_from_dpcd(dp, |
| DPCD_ADDR_ADJUST_REQUEST_LANE0_1, |
| 2, adjust_request); |
| 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; |
| } |
| |
| if (exynos_dp_channel_eq_ok(link_align, lane_count) == 0) { |
| /* 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, ®); |
| 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, ®); |
| 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; |
| } else { |
| /* 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"); |
| goto reduce_link_rate; |
| } |
| |
| for (lane = 0; lane < lane_count; lane++) |
| exynos_dp_set_lane_link_training(dp, |
| dp->link_train.training_lane[lane], |
| lane); |
| |
| exynos_dp_write_bytes_to_dpcd(dp, |
| DPCD_ADDR_TRAINING_LANE0_SET, |
| lane_count, |
| dp->link_train.training_lane); |
| } |
| } else { |
| goto reduce_link_rate; |
| } |
| |
| return 0; |
| |
| reduce_link_rate: |
| exynos_dp_reduce_link_rate(dp); |
| return -EIO; |
| } |
| |
| 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; |
| int training_finished = 0; |
| |
| dp->link_train.lt_state = START; |
| |
| /* Process here */ |
| while (!training_finished) { |
| switch (dp->link_train.lt_state) { |
| case START: |
| exynos_dp_link_start(dp); |
| 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; |
| } |
| } |
| |
| 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; |
| } |
| |
| 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; |
| |
| pdata = pdev->dev.platform_data; |
| if (!pdata) { |
| dev_err(&pdev->dev, "no platform data\n"); |
| return -EINVAL; |
| } |
| |
| 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; |
| |
| 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 (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 (pdata && 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 platform_device *pdev = to_platform_device(dev); |
| struct exynos_dp_platdata *pdata = pdev->dev.platform_data; |
| struct exynos_dp_device *dp = platform_get_drvdata(pdev); |
| |
| if (pdata && pdata->phy_exit) |
| pdata->phy_exit(); |
| |
| clk_disable_unprepare(dp->clock); |
| |
| return 0; |
| } |
| |
| static int exynos_dp_resume(struct device *dev) |
| { |
| struct platform_device *pdev = to_platform_device(dev); |
| struct exynos_dp_platdata *pdata = pdev->dev.platform_data; |
| struct exynos_dp_device *dp = platform_get_drvdata(pdev); |
| |
| if (pdata && 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 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, |
| }, |
| }; |
| |
| module_platform_driver(exynos_dp_driver); |
| |
| MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>"); |
| MODULE_DESCRIPTION("Samsung SoC DP Driver"); |
| MODULE_LICENSE("GPL"); |
