diff options
Diffstat (limited to 'drivers/gpu/drm/exynos/exynos_dp_core.c')
| -rw-r--r-- | drivers/gpu/drm/exynos/exynos_dp_core.c | 1499 |
1 files changed, 0 insertions, 1499 deletions
diff --git a/drivers/gpu/drm/exynos/exynos_dp_core.c b/drivers/gpu/drm/exynos/exynos_dp_core.c deleted file mode 100644 index cff8dc788820..000000000000 --- a/drivers/gpu/drm/exynos/exynos_dp_core.c +++ /dev/null @@ -1,1499 +0,0 @@ -/* - * 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/err.h> -#include <linux/clk.h> -#include <linux/io.h> -#include <linux/interrupt.h> -#include <linux/of.h> -#include <linux/of_gpio.h> -#include <linux/of_graph.h> -#include <linux/gpio.h> -#include <linux/component.h> -#include <linux/phy/phy.h> -#include <video/of_display_timing.h> -#include <video/of_videomode.h> - -#include <drm/drmP.h> -#include <drm/drm_crtc.h> -#include <drm/drm_crtc_helper.h> -#include <drm/drm_atomic_helper.h> -#include <drm/drm_panel.h> - -#include "exynos_dp_core.h" -#include "exynos_drm_crtc.h" - -#define ctx_from_connector(c) container_of(c, struct exynos_dp_device, \ - connector) - -static inline struct exynos_drm_crtc *dp_to_crtc(struct exynos_dp_device *dp) -{ - return to_exynos_crtc(dp->encoder.crtc); -} - -static inline struct exynos_dp_device *encoder_to_dp( - struct drm_encoder *e) -{ - return container_of(e, struct exynos_dp_device, encoder); -} - -struct bridge_init { - struct i2c_client *client; - struct device_node *node; -}; - -static void 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); -} - -static int exynos_dp_detect_hpd(struct exynos_dp_device *dp) -{ - int timeout_loop = 0; - - 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 */ - retval = exynos_dp_read_byte_from_i2c(dp, I2C_EDID_DEVICE_ADDR, - EDID_EXTENSION_FLAG, - &extend_block); - if (retval) - return retval; - - 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, DP_TEST_REQUEST, - &test_vector); - if (test_vector & DP_TEST_LINK_EDID_READ) { - exynos_dp_write_byte_to_dpcd(dp, - DP_TEST_EDID_CHECKSUM, - edid[EDID_BLOCK_LENGTH + EDID_CHECKSUM]); - exynos_dp_write_byte_to_dpcd(dp, - DP_TEST_RESPONSE, - DP_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, - DP_TEST_REQUEST, - &test_vector); - if (test_vector & DP_TEST_LINK_EDID_READ) { - exynos_dp_write_byte_to_dpcd(dp, - DP_TEST_EDID_CHECKSUM, - edid[EDID_CHECKSUM]); - exynos_dp_write_byte_to_dpcd(dp, - DP_TEST_RESPONSE, - DP_TEST_EDID_CHECKSUM_WRITE); - } - } - - dev_dbg(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 DP_DPCD_REV~RECEIVE_PORT1_CAP_1 */ - retval = exynos_dp_read_bytes_from_dpcd(dp, DP_DPCD_REV, - 12, buf); - if (retval) - return retval; - - /* Read EDID */ - for (i = 0; i < 3; i++) { - retval = exynos_dp_read_edid(dp); - if (!retval) - 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, DP_LANE_COUNT_SET, &data); - - if (enable) - exynos_dp_write_byte_to_dpcd(dp, DP_LANE_COUNT_SET, - DP_LANE_COUNT_ENHANCED_FRAME_EN | - DPCD_LANE_COUNT_SET(data)); - else - exynos_dp_write_byte_to_dpcd(dp, DP_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, DP_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, - DP_TRAINING_PATTERN_SET, - DP_TRAINING_PATTERN_DISABLE); -} - -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, pll_tries, 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 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, DP_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); - - /* Wait for PLL lock */ - pll_tries = 0; - while (exynos_dp_get_pll_lock_status(dp) == PLL_UNLOCKED) { - if (pll_tries == DP_TIMEOUT_LOOP_COUNT) { - dev_err(dp->dev, "Wait for PLL lock timed out\n"); - return -ETIMEDOUT; - } - - pll_tries++; - usleep_range(90, 120); - } - - /* Set training pattern 1 */ - exynos_dp_set_training_pattern(dp, TRAINING_PTN1); - - /* Set RX training pattern */ - retval = exynos_dp_write_byte_to_dpcd(dp, - DP_TRAINING_PATTERN_SET, - DP_LINK_SCRAMBLING_DISABLE | DP_TRAINING_PATTERN_1); - if (retval) - return retval; - - for (lane = 0; lane < lane_count; lane++) - buf[lane] = DP_TRAIN_PRE_EMPH_LEVEL_0 | - DP_TRAIN_VOLTAGE_SWING_LEVEL_0; - - retval = exynos_dp_write_bytes_to_dpcd(dp, DP_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 & DP_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 & DP_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 &= DP_CHANNEL_EQ_BITS; - if (lane_status != DP_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 |= DP_TRAIN_MAX_SWING_REACHED; - if (pre_emphasis == PRE_EMPHASIS_LEVEL_3) - training_lane |= DP_TRAIN_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, - DP_LANE0_1_STATUS, 2, link_status); - if (retval) - return retval; - - retval = exynos_dp_read_bytes_from_dpcd(dp, - DP_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, - DP_TRAINING_PATTERN_SET, - DP_LINK_SCRAMBLING_DISABLE | - DP_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, - DP_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, - DP_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, - DP_ADJUST_REQUEST_LANE0_1, 2, adjust_request); - if (retval) - return retval; - - retval = exynos_dp_read_byte_from_dpcd(dp, - DP_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, ®); - 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; - - 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, DP_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, DP_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, DP_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) -{ - int retval = 0; - int timeout_loop = 0; - int done_count = 0; - - exynos_dp_config_video_slave_mode(dp); - - exynos_dp_set_video_color_format(dp); - - 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); - - 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, - DP_TRAINING_PATTERN_SET, - &data); - exynos_dp_write_byte_to_dpcd(dp, - DP_TRAINING_PATTERN_SET, - (u8)(data & ~DP_LINK_SCRAMBLING_DISABLE)); - } else { - exynos_dp_disable_scrambling(dp); - - exynos_dp_read_byte_from_dpcd(dp, - DP_TRAINING_PATTERN_SET, - &data); - exynos_dp_write_byte_to_dpcd(dp, - DP_TRAINING_PATTERN_SET, - (u8)(data | DP_LINK_SCRAMBLING_DISABLE)); - } -} - -static irqreturn_t exynos_dp_irq_handler(int irq, void *arg) -{ - struct exynos_dp_device *dp = arg; - - enum dp_irq_type irq_type; - - irq_type = exynos_dp_get_irq_type(dp); - switch (irq_type) { - case DP_IRQ_TYPE_HP_CABLE_IN: - dev_dbg(dp->dev, "Received irq - cable in\n"); - schedule_work(&dp->hotplug_work); - exynos_dp_clear_hotplug_interrupts(dp); - break; - case DP_IRQ_TYPE_HP_CABLE_OUT: - dev_dbg(dp->dev, "Received irq - cable out\n"); - exynos_dp_clear_hotplug_interrupts(dp); - break; - case DP_IRQ_TYPE_HP_CHANGE: - /* - * We get these change notifications once in a while, but there - * is nothing we can do with them. Just ignore it for now and - * only handle cable changes. - */ - dev_dbg(dp->dev, "Received irq - hotplug change; ignoring.\n"); - exynos_dp_clear_hotplug_interrupts(dp); - break; - default: - dev_err(dp->dev, "Received irq - unknown type!\n"); - break; - } - return IRQ_HANDLED; -} - -static void exynos_dp_hotplug(struct work_struct *work) -{ - struct exynos_dp_device *dp; - - dp = container_of(work, struct exynos_dp_device, hotplug_work); - - if (dp->drm_dev) - drm_helper_hpd_irq_event(dp->drm_dev); -} - -static void exynos_dp_commit(struct drm_encoder *encoder) -{ - struct exynos_dp_device *dp = encoder_to_dp(encoder); - int ret; - - /* Keep the panel disabled while we configure video */ - if (dp->panel) { - if (drm_panel_disable(dp->panel)) - DRM_ERROR("failed to disable the panel\n"); - } - - ret = exynos_dp_detect_hpd(dp); - if (ret) { - /* Cable has been disconnected, we're done */ - return; - } - - ret = exynos_dp_handle_edid(dp); - if (ret) { - dev_err(dp->dev, "unable to handle edid\n"); - return; - } - - ret = exynos_dp_set_link_train(dp, dp->video_info->lane_count, - dp->video_info->link_rate); - if (ret) { - dev_err(dp->dev, "unable to do link train\n"); - return; - } - - 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); - if (ret) - dev_err(dp->dev, "unable to config video\n"); - - /* Safe to enable the panel now */ - if (dp->panel) { - if (drm_panel_enable(dp->panel)) - DRM_ERROR("failed to enable the panel\n"); - } - - /* Enable video */ - exynos_dp_start_video(dp); -} - -static enum drm_connector_status exynos_dp_detect( - struct drm_connector *connector, bool force) -{ - return connector_status_connected; -} - -static void exynos_dp_connector_destroy(struct drm_connector *connector) -{ - drm_connector_unregister(connector); - drm_connector_cleanup(connector); -} - -static const struct drm_connector_funcs exynos_dp_connector_funcs = { - .dpms = drm_atomic_helper_connector_dpms, - .fill_modes = drm_helper_probe_single_connector_modes, - .detect = exynos_dp_detect, - .destroy = exynos_dp_connector_destroy, - .reset = drm_atomic_helper_connector_reset, - .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, - .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, -}; - -static int exynos_dp_get_modes(struct drm_connector *connector) -{ - struct exynos_dp_device *dp = ctx_from_connector(connector); - struct drm_display_mode *mode; - - if (dp->panel) - return drm_panel_get_modes(dp->panel); - - mode = drm_mode_create(connector->dev); - if (!mode) { - DRM_ERROR("failed to create a new display mode.\n"); - return 0; - } - - drm_display_mode_from_videomode(&dp->vm, mode); - connector->display_info.width_mm = mode->width_mm; - connector->display_info.height_mm = mode->height_mm; - - mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED; - drm_mode_set_name(mode); - drm_mode_probed_add(connector, mode); - - return 1; -} - -static struct drm_encoder *exynos_dp_best_encoder( - struct drm_connector *connector) -{ - struct exynos_dp_device *dp = ctx_from_connector(connector); - - return &dp->encoder; -} - -static const struct drm_connector_helper_funcs exynos_dp_connector_helper_funcs = { - .get_modes = exynos_dp_get_modes, - .best_encoder = exynos_dp_best_encoder, -}; - -/* returns the number of bridges attached */ -static int exynos_drm_attach_lcd_bridge(struct exynos_dp_device *dp, - struct drm_encoder *encoder) -{ - int ret; - - encoder->bridge->next = dp->ptn_bridge; - dp->ptn_bridge->encoder = encoder; - ret = drm_bridge_attach(encoder->dev, dp->ptn_bridge); - if (ret) { - DRM_ERROR("Failed to attach bridge to drm\n"); - return ret; - } - - return 0; -} - -static int exynos_dp_bridge_attach(struct drm_bridge *bridge) -{ - struct exynos_dp_device *dp = bridge->driver_private; - struct drm_encoder *encoder = &dp->encoder; - struct drm_connector *connector = &dp->connector; - int ret; - - /* Pre-empt DP connector creation if there's a bridge */ - if (dp->ptn_bridge) { - ret = exynos_drm_attach_lcd_bridge(dp, encoder); - if (!ret) - return 0; - } - - connector->polled = DRM_CONNECTOR_POLL_HPD; - - ret = drm_connector_init(dp->drm_dev, connector, - &exynos_dp_connector_funcs, DRM_MODE_CONNECTOR_eDP); - if (ret) { - DRM_ERROR("Failed to initialize connector with drm\n"); - return ret; - } - - drm_connector_helper_add(connector, &exynos_dp_connector_helper_funcs); - drm_connector_register(connector); - drm_mode_connector_attach_encoder(connector, encoder); - - if (dp->panel) - ret = drm_panel_attach(dp->panel, &dp->connector); - - return ret; -} - -static void exynos_dp_bridge_enable(struct drm_bridge *bridge) -{ - struct exynos_dp_device *dp = bridge->driver_private; - struct exynos_drm_crtc *crtc = dp_to_crtc(dp); - - if (dp->dpms_mode == DRM_MODE_DPMS_ON) - return; - - pm_runtime_get_sync(dp->dev); - - if (dp->panel) { - if (drm_panel_prepare(dp->panel)) { - DRM_ERROR("failed to setup the panel\n"); - return; - } - } - - if (crtc->ops->clock_enable) - crtc->ops->clock_enable(dp_to_crtc(dp), true); - - phy_power_on(dp->phy); - exynos_dp_init_dp(dp); - enable_irq(dp->irq); - exynos_dp_commit(&dp->encoder); - - dp->dpms_mode = DRM_MODE_DPMS_ON; -} - -static void exynos_dp_bridge_disable(struct drm_bridge *bridge) -{ - struct exynos_dp_device *dp = bridge->driver_private; - struct exynos_drm_crtc *crtc = dp_to_crtc(dp); - - if (dp->dpms_mode != DRM_MODE_DPMS_ON) - return; - - if (dp->panel) { - if (drm_panel_disable(dp->panel)) { - DRM_ERROR("failed to disable the panel\n"); - return; - } - } - - disable_irq(dp->irq); - flush_work(&dp->hotplug_work); - phy_power_off(dp->phy); - - if (crtc->ops->clock_enable) - crtc->ops->clock_enable(dp_to_crtc(dp), false); - - if (dp->panel) { - if (drm_panel_unprepare(dp->panel)) - DRM_ERROR("failed to turnoff the panel\n"); - } - - pm_runtime_put_sync(dp->dev); - - dp->dpms_mode = DRM_MODE_DPMS_OFF; -} - -static void exynos_dp_bridge_nop(struct drm_bridge *bridge) -{ - /* do nothing */ -} - -static const struct drm_bridge_funcs exynos_dp_bridge_funcs = { - .enable = exynos_dp_bridge_enable, - .disable = exynos_dp_bridge_disable, - .pre_enable = exynos_dp_bridge_nop, - .post_disable = exynos_dp_bridge_nop, - .attach = exynos_dp_bridge_attach, -}; - -static int exynos_dp_create_connector(struct drm_encoder *encoder) -{ - struct exynos_dp_device *dp = encoder_to_dp(encoder); - struct drm_device *drm_dev = dp->drm_dev; - struct drm_bridge *bridge; - int ret; - - bridge = devm_kzalloc(drm_dev->dev, sizeof(*bridge), GFP_KERNEL); - if (!bridge) { - DRM_ERROR("failed to allocate for drm bridge\n"); - return -ENOMEM; - } - - dp->bridge = bridge; - - encoder->bridge = bridge; - bridge->driver_private = dp; - bridge->encoder = encoder; - bridge->funcs = &exynos_dp_bridge_funcs; - - ret = drm_bridge_attach(drm_dev, bridge); - if (ret) { - DRM_ERROR("failed to attach drm bridge\n"); - return -EINVAL; - } - - return 0; -} - -static void exynos_dp_mode_set(struct drm_encoder *encoder, - struct drm_display_mode *mode, - struct drm_display_mode *adjusted_mode) -{ -} - -static void exynos_dp_enable(struct drm_encoder *encoder) -{ -} - -static void exynos_dp_disable(struct drm_encoder *encoder) -{ -} - -static const struct drm_encoder_helper_funcs exynos_dp_encoder_helper_funcs = { - .mode_set = exynos_dp_mode_set, - .enable = exynos_dp_enable, - .disable = exynos_dp_disable, -}; - -static const struct drm_encoder_funcs exynos_dp_encoder_funcs = { - .destroy = drm_encoder_cleanup, -}; - -static struct video_info *exynos_dp_dt_parse_pdata(struct device *dev) -{ - struct device_node *dp_node = dev->of_node; - struct video_info *dp_video_config; - - dp_video_config = devm_kzalloc(dev, - sizeof(*dp_video_config), GFP_KERNEL); - if (!dp_video_config) - return ERR_PTR(-ENOMEM); - - 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 dp_video_config; -} - -static int exynos_dp_dt_parse_panel(struct exynos_dp_device *dp) -{ - int ret; - - ret = of_get_videomode(dp->dev->of_node, &dp->vm, OF_USE_NATIVE_MODE); - if (ret) { - DRM_ERROR("failed: of_get_videomode() : %d\n", ret); - return ret; - } - return 0; -} - -static int exynos_dp_bind(struct device *dev, struct device *master, void *data) -{ - struct exynos_dp_device *dp = dev_get_drvdata(dev); - struct platform_device *pdev = to_platform_device(dev); - struct drm_device *drm_dev = data; - struct drm_encoder *encoder = &dp->encoder; - struct resource *res; - unsigned int irq_flags; - int pipe, ret = 0; - - dp->dev = &pdev->dev; - dp->dpms_mode = DRM_MODE_DPMS_OFF; - - dp->video_info = exynos_dp_dt_parse_pdata(&pdev->dev); - if (IS_ERR(dp->video_info)) - return PTR_ERR(dp->video_info); - - dp->phy = devm_phy_get(dp->dev, "dp"); - if (IS_ERR(dp->phy)) { - dev_err(dp->dev, "no DP phy configured\n"); - ret = PTR_ERR(dp->phy); - if (ret) { - /* - * phy itself is not enabled, so we can move forward - * assigning NULL to phy pointer. - */ - if (ret == -ENOSYS || ret == -ENODEV) - dp->phy = NULL; - else - return ret; - } - } - - if (!dp->panel && !dp->ptn_bridge) { - ret = exynos_dp_dt_parse_panel(dp); - if (ret) - return ret; - } - - 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_ioremap_resource(&pdev->dev, res); - if (IS_ERR(dp->reg_base)) - return PTR_ERR(dp->reg_base); - - dp->hpd_gpio = of_get_named_gpio(dev->of_node, "samsung,hpd-gpio", 0); - - if (gpio_is_valid(dp->hpd_gpio)) { - /* - * Set up the hotplug GPIO from the device tree as an interrupt. - * Simply specifying a different interrupt in the device tree - * doesn't work since we handle hotplug rather differently when - * using a GPIO. We also need the actual GPIO specifier so - * that we can get the current state of the GPIO. - */ - ret = devm_gpio_request_one(&pdev->dev, dp->hpd_gpio, GPIOF_IN, - "hpd_gpio"); - if (ret) { - dev_err(&pdev->dev, "failed to get hpd gpio\n"); - return ret; - } - dp->irq = gpio_to_irq(dp->hpd_gpio); - irq_flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING; - } else { - dp->hpd_gpio = -ENODEV; - dp->irq = platform_get_irq(pdev, 0); - irq_flags = 0; - } - - if (dp->irq == -ENXIO) { - dev_err(&pdev->dev, "failed to get irq\n"); - return -ENODEV; - } - - INIT_WORK(&dp->hotplug_work, exynos_dp_hotplug); - - ret = devm_request_irq(&pdev->dev, dp->irq, exynos_dp_irq_handler, - irq_flags, "exynos-dp", dp); - if (ret) { - dev_err(&pdev->dev, "failed to request irq\n"); - return ret; - } - disable_irq(dp->irq); - - dp->drm_dev = drm_dev; - - pipe = exynos_drm_crtc_get_pipe_from_type(drm_dev, - EXYNOS_DISPLAY_TYPE_LCD); - if (pipe < 0) - return pipe; - - encoder->possible_crtcs = 1 << pipe; - - DRM_DEBUG_KMS("possible_crtcs = 0x%x\n", encoder->possible_crtcs); - - drm_encoder_init(drm_dev, encoder, &exynos_dp_encoder_funcs, - DRM_MODE_ENCODER_TMDS, NULL); - - drm_encoder_helper_add(encoder, &exynos_dp_encoder_helper_funcs); - - ret = exynos_dp_create_connector(encoder); - if (ret) { - DRM_ERROR("failed to create connector ret = %d\n", ret); - drm_encoder_cleanup(encoder); - return ret; - } - - return 0; -} - -static void exynos_dp_unbind(struct device *dev, struct device *master, - void *data) -{ - struct exynos_dp_device *dp = dev_get_drvdata(dev); - - exynos_dp_disable(&dp->encoder); -} - -static const struct component_ops exynos_dp_ops = { - .bind = exynos_dp_bind, - .unbind = exynos_dp_unbind, -}; - -static int exynos_dp_probe(struct platform_device *pdev) -{ - struct device *dev = &pdev->dev; - struct device_node *np = NULL, *endpoint = NULL; - struct exynos_dp_device *dp; - int ret; - - dp = devm_kzalloc(&pdev->dev, sizeof(struct exynos_dp_device), - GFP_KERNEL); - if (!dp) - return -ENOMEM; - - platform_set_drvdata(pdev, dp); - - /* This is for the backward compatibility. */ - np = of_parse_phandle(dev->of_node, "panel", 0); - if (np) { - dp->panel = of_drm_find_panel(np); - of_node_put(np); - if (!dp->panel) - return -EPROBE_DEFER; - goto out; - } - - endpoint = of_graph_get_next_endpoint(dev->of_node, NULL); - if (endpoint) { - np = of_graph_get_remote_port_parent(endpoint); - if (np) { - /* The remote port can be either a panel or a bridge */ - dp->panel = of_drm_find_panel(np); - if (!dp->panel) { - dp->ptn_bridge = of_drm_find_bridge(np); - if (!dp->ptn_bridge) { - of_node_put(np); - return -EPROBE_DEFER; - } - } - of_node_put(np); - } else { - DRM_ERROR("no remote endpoint device node found.\n"); - return -EINVAL; - } - } else { - DRM_ERROR("no port endpoint subnode found.\n"); - return -EINVAL; - } - -out: - pm_runtime_enable(dev); - - ret = component_add(&pdev->dev, &exynos_dp_ops); - if (ret) - goto err_disable_pm_runtime; - - return ret; - -err_disable_pm_runtime: - pm_runtime_disable(dev); - - return ret; -} - -static int exynos_dp_remove(struct platform_device *pdev) -{ - pm_runtime_disable(&pdev->dev); - component_del(&pdev->dev, &exynos_dp_ops); - - return 0; -} - -#ifdef CONFIG_PM -static int exynos_dp_suspend(struct device *dev) -{ - struct exynos_dp_device *dp = dev_get_drvdata(dev); - - clk_disable_unprepare(dp->clock); - - return 0; -} - -static int exynos_dp_resume(struct device *dev) -{ - struct exynos_dp_device *dp = dev_get_drvdata(dev); - int ret; - - ret = clk_prepare_enable(dp->clock); - if (ret < 0) { - DRM_ERROR("Failed to prepare_enable the clock clk [%d]\n", ret); - return ret; - } - - return 0; -} -#endif - -static const struct dev_pm_ops exynos_dp_pm_ops = { - SET_RUNTIME_PM_OPS(exynos_dp_suspend, exynos_dp_resume, NULL) -}; - -static const struct of_device_id exynos_dp_match[] = { - { .compatible = "samsung,exynos5-dp" }, - {}, -}; -MODULE_DEVICE_TABLE(of, exynos_dp_match); - -struct platform_driver dp_driver = { - .probe = exynos_dp_probe, - .remove = exynos_dp_remove, - .driver = { - .name = "exynos-dp", - .owner = THIS_MODULE, - .pm = &exynos_dp_pm_ops, - .of_match_table = exynos_dp_match, - }, -}; - -MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>"); -MODULE_DESCRIPTION("Samsung SoC DP Driver"); -MODULE_LICENSE("GPL v2"); |