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- // SPDX-License-Identifier: GPL-2.0-or-later
- /*
- * Analogix DP (Display Port) core interface driver.
- *
- * Copyright (C) 2012 Samsung Electronics Co., Ltd.
- * Author: Jingoo Han <jg1.han@samsung.com>
- */
- #include <linux/clk.h>
- #include <linux/component.h>
- #include <linux/err.h>
- #include <linux/gpio/consumer.h>
- #include <linux/interrupt.h>
- #include <linux/io.h>
- #include <linux/iopoll.h>
- #include <linux/module.h>
- #include <linux/of.h>
- #include <linux/phy/phy.h>
- #include <linux/platform_device.h>
- #include <drm/bridge/analogix_dp.h>
- #include <drm/drm_atomic.h>
- #include <drm/drm_atomic_helper.h>
- #include <drm/drm_bridge.h>
- #include <drm/drm_crtc.h>
- #include <drm/drm_device.h>
- #include <drm/drm_panel.h>
- #include <drm/drm_print.h>
- #include <drm/drm_probe_helper.h>
- #include "analogix_dp_core.h"
- #include "analogix_dp_reg.h"
- #define to_dp(nm) container_of(nm, struct analogix_dp_device, nm)
- static const bool verify_fast_training;
- struct bridge_init {
- struct i2c_client *client;
- struct device_node *node;
- };
- static int analogix_dp_init_dp(struct analogix_dp_device *dp)
- {
- int ret;
- analogix_dp_reset(dp);
- analogix_dp_swreset(dp);
- analogix_dp_init_analog_param(dp);
- analogix_dp_init_interrupt(dp);
- /* SW defined function Normal operation */
- analogix_dp_enable_sw_function(dp);
- analogix_dp_config_interrupt(dp);
- ret = analogix_dp_init_analog_func(dp);
- if (ret)
- return ret;
- analogix_dp_init_hpd(dp);
- analogix_dp_init_aux(dp);
- return 0;
- }
- static int analogix_dp_detect_hpd(struct analogix_dp_device *dp)
- {
- int timeout_loop = 0;
- while (timeout_loop < DP_TIMEOUT_LOOP_COUNT) {
- if (analogix_dp_get_plug_in_status(dp) == 0)
- return 0;
- timeout_loop++;
- usleep_range(1000, 1100);
- }
- /*
- * Some edp screen do not have hpd signal, so we can't just
- * return failed when hpd plug in detect failed, DT property
- * "force-hpd" would indicate whether driver need this.
- */
- if (!dp->force_hpd)
- return -ETIMEDOUT;
- /*
- * The eDP TRM indicate that if HPD_STATUS(RO) is 0, AUX CH
- * will not work, so we need to give a force hpd action to
- * set HPD_STATUS manually.
- */
- dev_dbg(dp->dev, "failed to get hpd plug status, try to force hpd\n");
- analogix_dp_force_hpd(dp);
- if (analogix_dp_get_plug_in_status(dp) != 0) {
- dev_err(dp->dev, "failed to get hpd plug in status\n");
- return -EINVAL;
- }
- dev_dbg(dp->dev, "success to get plug in status after force hpd\n");
- return 0;
- }
- static bool analogix_dp_detect_sink_psr(struct analogix_dp_device *dp)
- {
- unsigned char psr_version;
- int ret;
- ret = drm_dp_dpcd_readb(&dp->aux, DP_PSR_SUPPORT, &psr_version);
- if (ret != 1) {
- dev_err(dp->dev, "failed to get PSR version, disable it\n");
- return false;
- }
- dev_dbg(dp->dev, "Panel PSR version : %x\n", psr_version);
- return psr_version & DP_PSR_IS_SUPPORTED;
- }
- static int analogix_dp_enable_sink_psr(struct analogix_dp_device *dp)
- {
- unsigned char psr_en;
- int ret;
- /* Disable psr function */
- ret = drm_dp_dpcd_readb(&dp->aux, DP_PSR_EN_CFG, &psr_en);
- if (ret != 1) {
- dev_err(dp->dev, "failed to get psr config\n");
- goto end;
- }
- psr_en &= ~DP_PSR_ENABLE;
- ret = drm_dp_dpcd_writeb(&dp->aux, DP_PSR_EN_CFG, psr_en);
- if (ret != 1) {
- dev_err(dp->dev, "failed to disable panel psr\n");
- goto end;
- }
- /* Main-Link transmitter remains active during PSR active states */
- psr_en = DP_PSR_CRC_VERIFICATION;
- ret = drm_dp_dpcd_writeb(&dp->aux, DP_PSR_EN_CFG, psr_en);
- if (ret != 1) {
- dev_err(dp->dev, "failed to set panel psr\n");
- goto end;
- }
- /* Enable psr function */
- psr_en = DP_PSR_ENABLE | DP_PSR_CRC_VERIFICATION;
- ret = drm_dp_dpcd_writeb(&dp->aux, DP_PSR_EN_CFG, psr_en);
- if (ret != 1) {
- dev_err(dp->dev, "failed to set panel psr\n");
- goto end;
- }
- analogix_dp_enable_psr_crc(dp);
- dp->psr_supported = true;
- return 0;
- end:
- dev_err(dp->dev, "enable psr fail, force to disable psr\n");
- return ret;
- }
- static int
- analogix_dp_enable_rx_to_enhanced_mode(struct analogix_dp_device *dp,
- bool enable)
- {
- u8 data;
- int ret;
- ret = drm_dp_dpcd_readb(&dp->aux, DP_LANE_COUNT_SET, &data);
- if (ret != 1)
- return ret;
- if (enable)
- ret = drm_dp_dpcd_writeb(&dp->aux, DP_LANE_COUNT_SET,
- DP_LANE_COUNT_ENHANCED_FRAME_EN |
- DPCD_LANE_COUNT_SET(data));
- else
- ret = drm_dp_dpcd_writeb(&dp->aux, DP_LANE_COUNT_SET,
- DPCD_LANE_COUNT_SET(data));
- return ret < 0 ? ret : 0;
- }
- static int analogix_dp_is_enhanced_mode_available(struct analogix_dp_device *dp,
- u8 *enhanced_mode_support)
- {
- u8 data;
- int ret;
- ret = drm_dp_dpcd_readb(&dp->aux, DP_MAX_LANE_COUNT, &data);
- if (ret != 1) {
- *enhanced_mode_support = 0;
- return ret;
- }
- *enhanced_mode_support = DPCD_ENHANCED_FRAME_CAP(data);
- return 0;
- }
- static int analogix_dp_set_enhanced_mode(struct analogix_dp_device *dp)
- {
- u8 data;
- int ret;
- ret = analogix_dp_is_enhanced_mode_available(dp, &data);
- if (ret < 0)
- return ret;
- ret = analogix_dp_enable_rx_to_enhanced_mode(dp, data);
- if (ret < 0)
- return ret;
- analogix_dp_enable_enhanced_mode(dp, data);
- return 0;
- }
- static int analogix_dp_training_pattern_dis(struct analogix_dp_device *dp)
- {
- int ret;
- analogix_dp_set_training_pattern(dp, DP_NONE);
- ret = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET,
- DP_TRAINING_PATTERN_DISABLE);
- return ret < 0 ? ret : 0;
- }
- static void
- analogix_dp_set_lane_lane_pre_emphasis(struct analogix_dp_device *dp,
- int pre_emphasis, int lane)
- {
- switch (lane) {
- case 0:
- analogix_dp_set_lane0_pre_emphasis(dp, pre_emphasis);
- break;
- case 1:
- analogix_dp_set_lane1_pre_emphasis(dp, pre_emphasis);
- break;
- case 2:
- analogix_dp_set_lane2_pre_emphasis(dp, pre_emphasis);
- break;
- case 3:
- analogix_dp_set_lane3_pre_emphasis(dp, pre_emphasis);
- break;
- }
- }
- static int analogix_dp_link_start(struct analogix_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*/
- analogix_dp_set_link_bandwidth(dp, dp->link_train.link_rate);
- analogix_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 = drm_dp_dpcd_write(&dp->aux, DP_LINK_BW_SET, buf, 2);
- if (retval < 0)
- return retval;
- /* set enhanced mode if available */
- retval = analogix_dp_set_enhanced_mode(dp);
- if (retval < 0) {
- dev_err(dp->dev, "failed to set enhance mode\n");
- return retval;
- }
- /* Set TX pre-emphasis to minimum */
- for (lane = 0; lane < lane_count; lane++)
- analogix_dp_set_lane_lane_pre_emphasis(dp,
- PRE_EMPHASIS_LEVEL_0, lane);
- /* Wait for PLL lock */
- pll_tries = 0;
- while (analogix_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 */
- analogix_dp_set_training_pattern(dp, TRAINING_PTN1);
- /* Set RX training pattern */
- retval = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET,
- DP_LINK_SCRAMBLING_DISABLE |
- DP_TRAINING_PATTERN_1);
- if (retval < 0)
- return retval;
- for (lane = 0; lane < lane_count; lane++)
- buf[lane] = DP_TRAIN_PRE_EMPH_LEVEL_0 |
- DP_TRAIN_VOLTAGE_SWING_LEVEL_0;
- retval = drm_dp_dpcd_write(&dp->aux, DP_TRAINING_LANE0_SET, buf,
- lane_count);
- if (retval < 0)
- return retval;
- return 0;
- }
- static unsigned char analogix_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 analogix_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 = analogix_dp_get_lane_status(link_status, lane);
- if ((lane_status & DP_LANE_CR_DONE) == 0)
- return -EINVAL;
- }
- return 0;
- }
- static int analogix_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 = analogix_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
- analogix_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 analogix_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 analogix_dp_set_lane_link_training(struct analogix_dp_device *dp,
- u8 training_lane_set, int lane)
- {
- switch (lane) {
- case 0:
- analogix_dp_set_lane0_link_training(dp, training_lane_set);
- break;
- case 1:
- analogix_dp_set_lane1_link_training(dp, training_lane_set);
- break;
- case 2:
- analogix_dp_set_lane2_link_training(dp, training_lane_set);
- break;
- case 3:
- analogix_dp_set_lane3_link_training(dp, training_lane_set);
- break;
- }
- }
- static unsigned int
- analogix_dp_get_lane_link_training(struct analogix_dp_device *dp,
- int lane)
- {
- u32 reg;
- switch (lane) {
- case 0:
- reg = analogix_dp_get_lane0_link_training(dp);
- break;
- case 1:
- reg = analogix_dp_get_lane1_link_training(dp);
- break;
- case 2:
- reg = analogix_dp_get_lane2_link_training(dp);
- break;
- case 3:
- reg = analogix_dp_get_lane3_link_training(dp);
- break;
- default:
- WARN_ON(1);
- return 0;
- }
- return reg;
- }
- static void analogix_dp_reduce_link_rate(struct analogix_dp_device *dp)
- {
- analogix_dp_training_pattern_dis(dp);
- analogix_dp_set_enhanced_mode(dp);
- dp->link_train.lt_state = FAILED;
- }
- static void analogix_dp_get_adjust_training_lane(struct analogix_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 = analogix_dp_get_adjust_request_voltage(
- adjust_request, lane);
- pre_emphasis = analogix_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 analogix_dp_process_clock_recovery(struct analogix_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 = drm_dp_dpcd_read(&dp->aux, DP_LANE0_1_STATUS, link_status, 2);
- if (retval < 0)
- return retval;
- retval = drm_dp_dpcd_read(&dp->aux, DP_ADJUST_REQUEST_LANE0_1,
- adjust_request, 2);
- if (retval < 0)
- return retval;
- if (analogix_dp_clock_recovery_ok(link_status, lane_count) == 0) {
- /* set training pattern 2 for EQ */
- analogix_dp_set_training_pattern(dp, TRAINING_PTN2);
- retval = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET,
- DP_LINK_SCRAMBLING_DISABLE |
- DP_TRAINING_PATTERN_2);
- if (retval < 0)
- return retval;
- dev_dbg(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 = analogix_dp_get_lane_link_training(
- dp, lane);
- voltage_swing = analogix_dp_get_adjust_request_voltage(
- adjust_request, lane);
- pre_emphasis = analogix_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);
- analogix_dp_reduce_link_rate(dp);
- return -EIO;
- }
- }
- }
- analogix_dp_get_adjust_training_lane(dp, adjust_request);
- for (lane = 0; lane < lane_count; lane++)
- analogix_dp_set_lane_link_training(dp,
- dp->link_train.training_lane[lane], lane);
- retval = drm_dp_dpcd_write(&dp->aux, DP_TRAINING_LANE0_SET,
- dp->link_train.training_lane, lane_count);
- if (retval < 0)
- return retval;
- return 0;
- }
- static int analogix_dp_process_equalizer_training(struct analogix_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 = drm_dp_dpcd_read(&dp->aux, DP_LANE0_1_STATUS, link_status, 2);
- if (retval < 0)
- return retval;
- if (analogix_dp_clock_recovery_ok(link_status, lane_count)) {
- analogix_dp_reduce_link_rate(dp);
- return -EIO;
- }
- retval = drm_dp_dpcd_read(&dp->aux, DP_ADJUST_REQUEST_LANE0_1,
- adjust_request, 2);
- if (retval < 0)
- return retval;
- retval = drm_dp_dpcd_readb(&dp->aux, DP_LANE_ALIGN_STATUS_UPDATED,
- &link_align);
- if (retval < 0)
- return retval;
- analogix_dp_get_adjust_training_lane(dp, adjust_request);
- if (!analogix_dp_channel_eq_ok(link_status, link_align, lane_count)) {
- /* traing pattern Set to Normal */
- retval = analogix_dp_training_pattern_dis(dp);
- if (retval < 0)
- return retval;
- dev_dbg(dp->dev, "Link Training success!\n");
- analogix_dp_get_link_bandwidth(dp, ®);
- dp->link_train.link_rate = reg;
- dev_dbg(dp->dev, "final bandwidth = %.2x\n",
- dp->link_train.link_rate);
- analogix_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);
- 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");
- analogix_dp_reduce_link_rate(dp);
- return -EIO;
- }
- for (lane = 0; lane < lane_count; lane++)
- analogix_dp_set_lane_link_training(dp,
- dp->link_train.training_lane[lane], lane);
- retval = drm_dp_dpcd_write(&dp->aux, DP_TRAINING_LANE0_SET,
- dp->link_train.training_lane, lane_count);
- if (retval < 0)
- return retval;
- return 0;
- }
- static void analogix_dp_get_max_rx_bandwidth(struct analogix_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
- * For DP rev.1.2, Maximum link rate of Main Link lanes
- * 0x06 = 1.62 Gbps, 0x0a = 2.7 Gbps, 0x14 = 5.4Gbps
- */
- drm_dp_dpcd_readb(&dp->aux, DP_MAX_LINK_RATE, &data);
- *bandwidth = data;
- }
- static void analogix_dp_get_max_rx_lane_count(struct analogix_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
- */
- drm_dp_dpcd_readb(&dp->aux, DP_MAX_LANE_COUNT, &data);
- *lane_count = DPCD_MAX_LANE_COUNT(data);
- }
- static int analogix_dp_full_link_train(struct analogix_dp_device *dp,
- u32 max_lanes, u32 max_rate)
- {
- int retval = 0;
- bool training_finished = false;
- /*
- * MACRO_RST must be applied after the PLL_LOCK to avoid
- * the DP inter pair skew issue for at least 10 us
- */
- analogix_dp_reset_macro(dp);
- /* Initialize by reading RX's DPCD */
- analogix_dp_get_max_rx_bandwidth(dp, &dp->link_train.link_rate);
- analogix_dp_get_max_rx_lane_count(dp, &dp->link_train.lane_count);
- if ((dp->link_train.link_rate != DP_LINK_BW_1_62) &&
- (dp->link_train.link_rate != DP_LINK_BW_2_7) &&
- (dp->link_train.link_rate != DP_LINK_BW_5_4)) {
- dev_err(dp->dev, "Rx Max Link Rate is abnormal :%x !\n",
- dp->link_train.link_rate);
- dp->link_train.link_rate = DP_LINK_BW_1_62;
- }
- 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_lanes)
- dp->link_train.lane_count = max_lanes;
- if (dp->link_train.link_rate > max_rate)
- dp->link_train.link_rate = max_rate;
- /* All DP analog module power up */
- analogix_dp_set_analog_power_down(dp, POWER_ALL, 0);
- dp->link_train.lt_state = START;
- /* Process here */
- while (!retval && !training_finished) {
- switch (dp->link_train.lt_state) {
- case START:
- retval = analogix_dp_link_start(dp);
- if (retval)
- dev_err(dp->dev, "LT link start failed!\n");
- break;
- case CLOCK_RECOVERY:
- retval = analogix_dp_process_clock_recovery(dp);
- if (retval)
- dev_err(dp->dev, "LT CR failed!\n");
- break;
- case EQUALIZER_TRAINING:
- retval = analogix_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 analogix_dp_fast_link_train(struct analogix_dp_device *dp)
- {
- int i, ret;
- u8 link_align, link_status[2];
- enum pll_status status;
- analogix_dp_reset_macro(dp);
- analogix_dp_set_link_bandwidth(dp, dp->link_train.link_rate);
- analogix_dp_set_lane_count(dp, dp->link_train.lane_count);
- for (i = 0; i < dp->link_train.lane_count; i++) {
- analogix_dp_set_lane_link_training(dp,
- dp->link_train.training_lane[i], i);
- }
- ret = readx_poll_timeout(analogix_dp_get_pll_lock_status, dp, status,
- status != PLL_UNLOCKED, 120,
- 120 * DP_TIMEOUT_LOOP_COUNT);
- if (ret) {
- DRM_DEV_ERROR(dp->dev, "Wait for pll lock failed %d\n", ret);
- return ret;
- }
- /* source Set training pattern 1 */
- analogix_dp_set_training_pattern(dp, TRAINING_PTN1);
- /* From DP spec, pattern must be on-screen for a minimum 500us */
- usleep_range(500, 600);
- analogix_dp_set_training_pattern(dp, TRAINING_PTN2);
- /* From DP spec, pattern must be on-screen for a minimum 500us */
- usleep_range(500, 600);
- /* TODO: enhanced_mode?*/
- analogix_dp_set_training_pattern(dp, DP_NONE);
- /*
- * Useful for debugging issues with fast link training, disable for more
- * speed
- */
- if (verify_fast_training) {
- ret = drm_dp_dpcd_readb(&dp->aux, DP_LANE_ALIGN_STATUS_UPDATED,
- &link_align);
- if (ret < 0) {
- DRM_DEV_ERROR(dp->dev, "Read align status failed %d\n",
- ret);
- return ret;
- }
- ret = drm_dp_dpcd_read(&dp->aux, DP_LANE0_1_STATUS, link_status,
- 2);
- if (ret < 0) {
- DRM_DEV_ERROR(dp->dev, "Read link status failed %d\n",
- ret);
- return ret;
- }
- if (analogix_dp_clock_recovery_ok(link_status,
- dp->link_train.lane_count)) {
- DRM_DEV_ERROR(dp->dev, "Clock recovery failed\n");
- analogix_dp_reduce_link_rate(dp);
- return -EIO;
- }
- if (analogix_dp_channel_eq_ok(link_status, link_align,
- dp->link_train.lane_count)) {
- DRM_DEV_ERROR(dp->dev, "Channel EQ failed\n");
- analogix_dp_reduce_link_rate(dp);
- return -EIO;
- }
- }
- return 0;
- }
- static int analogix_dp_train_link(struct analogix_dp_device *dp)
- {
- if (dp->fast_train_enable)
- return analogix_dp_fast_link_train(dp);
- return analogix_dp_full_link_train(dp, dp->video_info.max_lane_count,
- dp->video_info.max_link_rate);
- }
- static int analogix_dp_config_video(struct analogix_dp_device *dp)
- {
- int timeout_loop = 0;
- int done_count = 0;
- analogix_dp_config_video_slave_mode(dp);
- analogix_dp_set_video_color_format(dp);
- if (analogix_dp_get_pll_lock_status(dp) == PLL_UNLOCKED) {
- dev_err(dp->dev, "PLL is not locked yet.\n");
- return -EINVAL;
- }
- for (;;) {
- timeout_loop++;
- if (analogix_dp_is_slave_video_stream_clock_on(dp) == 0)
- break;
- if (timeout_loop > DP_TIMEOUT_LOOP_COUNT) {
- dev_err(dp->dev, "Timeout of slave video streamclk ok\n");
- return -ETIMEDOUT;
- }
- usleep_range(1000, 1001);
- }
- /* Set to use the register calculated M/N video */
- analogix_dp_set_video_cr_mn(dp, CALCULATED_M, 0, 0);
- /* For video bist, Video timing must be generated by register */
- analogix_dp_set_video_timing_mode(dp, VIDEO_TIMING_FROM_CAPTURE);
- /* Disable video mute */
- analogix_dp_enable_video_mute(dp, 0);
- /* Configure video slave mode */
- analogix_dp_enable_video_master(dp, 0);
- /* Enable video */
- analogix_dp_start_video(dp);
- timeout_loop = 0;
- for (;;) {
- timeout_loop++;
- if (analogix_dp_is_video_stream_on(dp) == 0) {
- done_count++;
- if (done_count > 10)
- break;
- } else if (done_count) {
- done_count = 0;
- }
- if (timeout_loop > DP_TIMEOUT_LOOP_COUNT) {
- dev_warn(dp->dev,
- "Ignoring timeout of video streamclk ok\n");
- break;
- }
- usleep_range(1000, 1001);
- }
- return 0;
- }
- static int analogix_dp_enable_scramble(struct analogix_dp_device *dp,
- bool enable)
- {
- u8 data;
- int ret;
- if (enable) {
- analogix_dp_enable_scrambling(dp);
- ret = drm_dp_dpcd_readb(&dp->aux, DP_TRAINING_PATTERN_SET,
- &data);
- if (ret != 1)
- return ret;
- ret = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET,
- (u8)(data & ~DP_LINK_SCRAMBLING_DISABLE));
- } else {
- analogix_dp_disable_scrambling(dp);
- ret = drm_dp_dpcd_readb(&dp->aux, DP_TRAINING_PATTERN_SET,
- &data);
- if (ret != 1)
- return ret;
- ret = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET,
- (u8)(data | DP_LINK_SCRAMBLING_DISABLE));
- }
- return ret < 0 ? ret : 0;
- }
- static irqreturn_t analogix_dp_hardirq(int irq, void *arg)
- {
- struct analogix_dp_device *dp = arg;
- irqreturn_t ret = IRQ_NONE;
- enum dp_irq_type irq_type;
- irq_type = analogix_dp_get_irq_type(dp);
- if (irq_type != DP_IRQ_TYPE_UNKNOWN) {
- analogix_dp_mute_hpd_interrupt(dp);
- ret = IRQ_WAKE_THREAD;
- }
- return ret;
- }
- static irqreturn_t analogix_dp_irq_thread(int irq, void *arg)
- {
- struct analogix_dp_device *dp = arg;
- enum dp_irq_type irq_type;
- irq_type = analogix_dp_get_irq_type(dp);
- if (irq_type & DP_IRQ_TYPE_HP_CABLE_IN ||
- irq_type & DP_IRQ_TYPE_HP_CABLE_OUT) {
- dev_dbg(dp->dev, "Detected cable status changed!\n");
- if (dp->drm_dev)
- drm_helper_hpd_irq_event(dp->drm_dev);
- }
- if (irq_type != DP_IRQ_TYPE_UNKNOWN) {
- analogix_dp_clear_hotplug_interrupts(dp);
- analogix_dp_unmute_hpd_interrupt(dp);
- }
- return IRQ_HANDLED;
- }
- static int analogix_dp_fast_link_train_detection(struct analogix_dp_device *dp)
- {
- int ret;
- u8 spread;
- ret = drm_dp_dpcd_readb(&dp->aux, DP_MAX_DOWNSPREAD, &spread);
- if (ret != 1) {
- dev_err(dp->dev, "failed to read downspread %d\n", ret);
- return ret;
- }
- dp->fast_train_enable = !!(spread & DP_NO_AUX_HANDSHAKE_LINK_TRAINING);
- dev_dbg(dp->dev, "fast link training %s\n",
- dp->fast_train_enable ? "supported" : "unsupported");
- return 0;
- }
- static int analogix_dp_commit(struct analogix_dp_device *dp)
- {
- int ret;
- /* Keep the panel disabled while we configure video */
- if (dp->plat_data->panel) {
- if (drm_panel_disable(dp->plat_data->panel))
- DRM_ERROR("failed to disable the panel\n");
- }
- ret = analogix_dp_train_link(dp);
- if (ret) {
- dev_err(dp->dev, "unable to do link train, ret=%d\n", ret);
- return ret;
- }
- ret = analogix_dp_enable_scramble(dp, 1);
- if (ret < 0) {
- dev_err(dp->dev, "can not enable scramble\n");
- return ret;
- }
- analogix_dp_init_video(dp);
- ret = analogix_dp_config_video(dp);
- if (ret) {
- dev_err(dp->dev, "unable to config video\n");
- return ret;
- }
- /* Safe to enable the panel now */
- if (dp->plat_data->panel) {
- ret = drm_panel_enable(dp->plat_data->panel);
- if (ret) {
- DRM_ERROR("failed to enable the panel\n");
- return ret;
- }
- }
- /* Check whether panel supports fast training */
- ret = analogix_dp_fast_link_train_detection(dp);
- if (ret)
- return ret;
- if (analogix_dp_detect_sink_psr(dp)) {
- ret = analogix_dp_enable_sink_psr(dp);
- if (ret)
- return ret;
- }
- return ret;
- }
- static int analogix_dp_enable_psr(struct analogix_dp_device *dp)
- {
- struct dp_sdp psr_vsc;
- int ret;
- u8 sink;
- ret = drm_dp_dpcd_readb(&dp->aux, DP_PSR_STATUS, &sink);
- if (ret != 1)
- DRM_DEV_ERROR(dp->dev, "Failed to read psr status %d\n", ret);
- else if (sink == DP_PSR_SINK_ACTIVE_RFB)
- return 0;
- /* Prepare VSC packet as per EDP 1.4 spec, Table 6.9 */
- memset(&psr_vsc, 0, sizeof(psr_vsc));
- psr_vsc.sdp_header.HB0 = 0;
- psr_vsc.sdp_header.HB1 = 0x7;
- psr_vsc.sdp_header.HB2 = 0x2;
- psr_vsc.sdp_header.HB3 = 0x8;
- psr_vsc.db[0] = 0;
- psr_vsc.db[1] = EDP_VSC_PSR_STATE_ACTIVE | EDP_VSC_PSR_CRC_VALUES_VALID;
- ret = analogix_dp_send_psr_spd(dp, &psr_vsc, true);
- if (!ret)
- analogix_dp_set_analog_power_down(dp, POWER_ALL, true);
- return ret;
- }
- static int analogix_dp_disable_psr(struct analogix_dp_device *dp)
- {
- struct dp_sdp psr_vsc;
- int ret;
- u8 sink;
- analogix_dp_set_analog_power_down(dp, POWER_ALL, false);
- ret = drm_dp_dpcd_writeb(&dp->aux, DP_SET_POWER, DP_SET_POWER_D0);
- if (ret != 1) {
- DRM_DEV_ERROR(dp->dev, "Failed to set DP Power0 %d\n", ret);
- return ret;
- }
- ret = drm_dp_dpcd_readb(&dp->aux, DP_PSR_STATUS, &sink);
- if (ret != 1) {
- DRM_DEV_ERROR(dp->dev, "Failed to read psr status %d\n", ret);
- return ret;
- } else if (sink == DP_PSR_SINK_INACTIVE) {
- DRM_DEV_ERROR(dp->dev, "sink inactive, skip disable psr");
- return 0;
- }
- ret = analogix_dp_train_link(dp);
- if (ret) {
- DRM_DEV_ERROR(dp->dev, "Failed to train the link %d\n", ret);
- return ret;
- }
- /* Prepare VSC packet as per EDP 1.4 spec, Table 6.9 */
- memset(&psr_vsc, 0, sizeof(psr_vsc));
- psr_vsc.sdp_header.HB0 = 0;
- psr_vsc.sdp_header.HB1 = 0x7;
- psr_vsc.sdp_header.HB2 = 0x2;
- psr_vsc.sdp_header.HB3 = 0x8;
- psr_vsc.db[0] = 0;
- psr_vsc.db[1] = 0;
- return analogix_dp_send_psr_spd(dp, &psr_vsc, true);
- }
- /*
- * This function is a bit of a catch-all for panel preparation, hopefully
- * simplifying the logic of functions that need to prepare/unprepare the panel
- * below.
- *
- * If @prepare is true, this function will prepare the panel. Conversely, if it
- * is false, the panel will be unprepared.
- *
- * If @is_modeset_prepare is true, the function will disregard the current state
- * of the panel and either prepare/unprepare the panel based on @prepare. Once
- * it finishes, it will update dp->panel_is_modeset to reflect the current state
- * of the panel.
- */
- static int analogix_dp_prepare_panel(struct analogix_dp_device *dp,
- bool prepare, bool is_modeset_prepare)
- {
- int ret = 0;
- if (!dp->plat_data->panel)
- return 0;
- mutex_lock(&dp->panel_lock);
- /*
- * Exit early if this is a temporary prepare/unprepare and we're already
- * modeset (since we neither want to prepare twice or unprepare early).
- */
- if (dp->panel_is_modeset && !is_modeset_prepare)
- goto out;
- if (prepare)
- ret = drm_panel_prepare(dp->plat_data->panel);
- else
- ret = drm_panel_unprepare(dp->plat_data->panel);
- if (ret)
- goto out;
- if (is_modeset_prepare)
- dp->panel_is_modeset = prepare;
- out:
- mutex_unlock(&dp->panel_lock);
- return ret;
- }
- static int analogix_dp_get_modes(struct drm_connector *connector)
- {
- struct analogix_dp_device *dp = to_dp(connector);
- struct edid *edid;
- int ret, num_modes = 0;
- if (dp->plat_data->panel) {
- num_modes += drm_panel_get_modes(dp->plat_data->panel, connector);
- } else {
- ret = analogix_dp_prepare_panel(dp, true, false);
- if (ret) {
- DRM_ERROR("Failed to prepare panel (%d)\n", ret);
- return 0;
- }
- pm_runtime_get_sync(dp->dev);
- edid = drm_get_edid(connector, &dp->aux.ddc);
- pm_runtime_put(dp->dev);
- if (edid) {
- drm_connector_update_edid_property(&dp->connector,
- edid);
- num_modes += drm_add_edid_modes(&dp->connector, edid);
- kfree(edid);
- }
- ret = analogix_dp_prepare_panel(dp, false, false);
- if (ret)
- DRM_ERROR("Failed to unprepare panel (%d)\n", ret);
- }
- if (dp->plat_data->get_modes)
- num_modes += dp->plat_data->get_modes(dp->plat_data, connector);
- return num_modes;
- }
- static struct drm_encoder *
- analogix_dp_best_encoder(struct drm_connector *connector)
- {
- struct analogix_dp_device *dp = to_dp(connector);
- return dp->encoder;
- }
- static int analogix_dp_atomic_check(struct drm_connector *connector,
- struct drm_atomic_state *state)
- {
- struct analogix_dp_device *dp = to_dp(connector);
- struct drm_connector_state *conn_state;
- struct drm_crtc_state *crtc_state;
- conn_state = drm_atomic_get_new_connector_state(state, connector);
- if (WARN_ON(!conn_state))
- return -ENODEV;
- conn_state->self_refresh_aware = true;
- if (!conn_state->crtc)
- return 0;
- crtc_state = drm_atomic_get_new_crtc_state(state, conn_state->crtc);
- if (!crtc_state)
- return 0;
- if (crtc_state->self_refresh_active && !dp->psr_supported)
- return -EINVAL;
- return 0;
- }
- static const struct drm_connector_helper_funcs analogix_dp_connector_helper_funcs = {
- .get_modes = analogix_dp_get_modes,
- .best_encoder = analogix_dp_best_encoder,
- .atomic_check = analogix_dp_atomic_check,
- };
- static enum drm_connector_status
- analogix_dp_detect(struct drm_connector *connector, bool force)
- {
- struct analogix_dp_device *dp = to_dp(connector);
- enum drm_connector_status status = connector_status_disconnected;
- int ret;
- if (dp->plat_data->panel)
- return connector_status_connected;
- ret = analogix_dp_prepare_panel(dp, true, false);
- if (ret) {
- DRM_ERROR("Failed to prepare panel (%d)\n", ret);
- return connector_status_disconnected;
- }
- if (!analogix_dp_detect_hpd(dp))
- status = connector_status_connected;
- ret = analogix_dp_prepare_panel(dp, false, false);
- if (ret)
- DRM_ERROR("Failed to unprepare panel (%d)\n", ret);
- return status;
- }
- static const struct drm_connector_funcs analogix_dp_connector_funcs = {
- .fill_modes = drm_helper_probe_single_connector_modes,
- .detect = analogix_dp_detect,
- .destroy = drm_connector_cleanup,
- .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 analogix_dp_bridge_attach(struct drm_bridge *bridge,
- enum drm_bridge_attach_flags flags)
- {
- struct analogix_dp_device *dp = bridge->driver_private;
- struct drm_encoder *encoder = dp->encoder;
- struct drm_connector *connector = NULL;
- int ret = 0;
- if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR) {
- DRM_ERROR("Fix bridge driver to make connector optional!");
- return -EINVAL;
- }
- if (!bridge->encoder) {
- DRM_ERROR("Parent encoder object not found");
- return -ENODEV;
- }
- if (!dp->plat_data->skip_connector) {
- connector = &dp->connector;
- connector->polled = DRM_CONNECTOR_POLL_HPD;
- ret = drm_connector_init(dp->drm_dev, connector,
- &analogix_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,
- &analogix_dp_connector_helper_funcs);
- drm_connector_attach_encoder(connector, encoder);
- }
- /*
- * NOTE: the connector registration is implemented in analogix
- * platform driver, that to say connector would be exist after
- * plat_data->attch return, that's why we record the connector
- * point after plat attached.
- */
- if (dp->plat_data->attach) {
- ret = dp->plat_data->attach(dp->plat_data, bridge, connector);
- if (ret) {
- DRM_ERROR("Failed at platform attach func\n");
- return ret;
- }
- }
- return 0;
- }
- static
- struct drm_crtc *analogix_dp_get_new_crtc(struct analogix_dp_device *dp,
- struct drm_atomic_state *state)
- {
- struct drm_encoder *encoder = dp->encoder;
- struct drm_connector *connector;
- struct drm_connector_state *conn_state;
- connector = drm_atomic_get_new_connector_for_encoder(state, encoder);
- if (!connector)
- return NULL;
- conn_state = drm_atomic_get_new_connector_state(state, connector);
- if (!conn_state)
- return NULL;
- return conn_state->crtc;
- }
- static void
- analogix_dp_bridge_atomic_pre_enable(struct drm_bridge *bridge,
- struct drm_bridge_state *old_bridge_state)
- {
- struct drm_atomic_state *old_state = old_bridge_state->base.state;
- struct analogix_dp_device *dp = bridge->driver_private;
- struct drm_crtc *crtc;
- struct drm_crtc_state *old_crtc_state;
- int ret;
- crtc = analogix_dp_get_new_crtc(dp, old_state);
- if (!crtc)
- return;
- old_crtc_state = drm_atomic_get_old_crtc_state(old_state, crtc);
- /* Don't touch the panel if we're coming back from PSR */
- if (old_crtc_state && old_crtc_state->self_refresh_active)
- return;
- ret = analogix_dp_prepare_panel(dp, true, true);
- if (ret)
- DRM_ERROR("failed to setup the panel ret = %d\n", ret);
- }
- static int analogix_dp_set_bridge(struct analogix_dp_device *dp)
- {
- int ret;
- pm_runtime_get_sync(dp->dev);
- ret = clk_prepare_enable(dp->clock);
- if (ret < 0) {
- DRM_ERROR("Failed to prepare_enable the clock clk [%d]\n", ret);
- goto out_dp_clk_pre;
- }
- if (dp->plat_data->power_on_start)
- dp->plat_data->power_on_start(dp->plat_data);
- phy_power_on(dp->phy);
- ret = analogix_dp_init_dp(dp);
- if (ret)
- goto out_dp_init;
- /*
- * According to DP spec v1.3 chap 3.5.1.2 Link Training,
- * We should first make sure the HPD signal is asserted high by device
- * when we want to establish a link with it.
- */
- ret = analogix_dp_detect_hpd(dp);
- if (ret) {
- DRM_ERROR("failed to get hpd single ret = %d\n", ret);
- goto out_dp_init;
- }
- ret = analogix_dp_commit(dp);
- if (ret) {
- DRM_ERROR("dp commit error, ret = %d\n", ret);
- goto out_dp_init;
- }
- if (dp->plat_data->power_on_end)
- dp->plat_data->power_on_end(dp->plat_data);
- enable_irq(dp->irq);
- return 0;
- out_dp_init:
- phy_power_off(dp->phy);
- if (dp->plat_data->power_off)
- dp->plat_data->power_off(dp->plat_data);
- clk_disable_unprepare(dp->clock);
- out_dp_clk_pre:
- pm_runtime_put_sync(dp->dev);
- return ret;
- }
- static void
- analogix_dp_bridge_atomic_enable(struct drm_bridge *bridge,
- struct drm_bridge_state *old_bridge_state)
- {
- struct drm_atomic_state *old_state = old_bridge_state->base.state;
- struct analogix_dp_device *dp = bridge->driver_private;
- struct drm_crtc *crtc;
- struct drm_crtc_state *old_crtc_state;
- int timeout_loop = 0;
- int ret;
- crtc = analogix_dp_get_new_crtc(dp, old_state);
- if (!crtc)
- return;
- old_crtc_state = drm_atomic_get_old_crtc_state(old_state, crtc);
- /* Not a full enable, just disable PSR and continue */
- if (old_crtc_state && old_crtc_state->self_refresh_active) {
- ret = analogix_dp_disable_psr(dp);
- if (ret)
- DRM_ERROR("Failed to disable psr %d\n", ret);
- return;
- }
- if (dp->dpms_mode == DRM_MODE_DPMS_ON)
- return;
- while (timeout_loop < MAX_PLL_LOCK_LOOP) {
- if (analogix_dp_set_bridge(dp) == 0) {
- dp->dpms_mode = DRM_MODE_DPMS_ON;
- return;
- }
- dev_err(dp->dev, "failed to set bridge, retry: %d\n",
- timeout_loop);
- timeout_loop++;
- usleep_range(10, 11);
- }
- dev_err(dp->dev, "too many times retry set bridge, give it up\n");
- }
- static void analogix_dp_bridge_disable(struct drm_bridge *bridge)
- {
- struct analogix_dp_device *dp = bridge->driver_private;
- int ret;
- if (dp->dpms_mode != DRM_MODE_DPMS_ON)
- return;
- if (dp->plat_data->panel) {
- if (drm_panel_disable(dp->plat_data->panel)) {
- DRM_ERROR("failed to disable the panel\n");
- return;
- }
- }
- disable_irq(dp->irq);
- if (dp->plat_data->power_off)
- dp->plat_data->power_off(dp->plat_data);
- analogix_dp_set_analog_power_down(dp, POWER_ALL, 1);
- phy_power_off(dp->phy);
- clk_disable_unprepare(dp->clock);
- pm_runtime_put_sync(dp->dev);
- ret = analogix_dp_prepare_panel(dp, false, true);
- if (ret)
- DRM_ERROR("failed to setup the panel ret = %d\n", ret);
- dp->fast_train_enable = false;
- dp->psr_supported = false;
- dp->dpms_mode = DRM_MODE_DPMS_OFF;
- }
- static void
- analogix_dp_bridge_atomic_disable(struct drm_bridge *bridge,
- struct drm_bridge_state *old_bridge_state)
- {
- struct drm_atomic_state *old_state = old_bridge_state->base.state;
- struct analogix_dp_device *dp = bridge->driver_private;
- struct drm_crtc *crtc;
- struct drm_crtc_state *new_crtc_state = NULL;
- crtc = analogix_dp_get_new_crtc(dp, old_state);
- if (!crtc)
- goto out;
- new_crtc_state = drm_atomic_get_new_crtc_state(old_state, crtc);
- if (!new_crtc_state)
- goto out;
- /* Don't do a full disable on PSR transitions */
- if (new_crtc_state->self_refresh_active)
- return;
- out:
- analogix_dp_bridge_disable(bridge);
- }
- static void
- analogix_dp_bridge_atomic_post_disable(struct drm_bridge *bridge,
- struct drm_bridge_state *old_bridge_state)
- {
- struct drm_atomic_state *old_state = old_bridge_state->base.state;
- struct analogix_dp_device *dp = bridge->driver_private;
- struct drm_crtc *crtc;
- struct drm_crtc_state *new_crtc_state;
- int ret;
- crtc = analogix_dp_get_new_crtc(dp, old_state);
- if (!crtc)
- return;
- new_crtc_state = drm_atomic_get_new_crtc_state(old_state, crtc);
- if (!new_crtc_state || !new_crtc_state->self_refresh_active)
- return;
- ret = analogix_dp_enable_psr(dp);
- if (ret)
- DRM_ERROR("Failed to enable psr (%d)\n", ret);
- }
- static void analogix_dp_bridge_mode_set(struct drm_bridge *bridge,
- const struct drm_display_mode *orig_mode,
- const struct drm_display_mode *mode)
- {
- struct analogix_dp_device *dp = bridge->driver_private;
- struct drm_display_info *display_info = &dp->connector.display_info;
- struct video_info *video = &dp->video_info;
- struct device_node *dp_node = dp->dev->of_node;
- int vic;
- /* Input video interlaces & hsync pol & vsync pol */
- video->interlaced = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
- video->v_sync_polarity = !!(mode->flags & DRM_MODE_FLAG_NVSYNC);
- video->h_sync_polarity = !!(mode->flags & DRM_MODE_FLAG_NHSYNC);
- /* Input video dynamic_range & colorimetry */
- vic = drm_match_cea_mode(mode);
- if ((vic == 6) || (vic == 7) || (vic == 21) || (vic == 22) ||
- (vic == 2) || (vic == 3) || (vic == 17) || (vic == 18)) {
- video->dynamic_range = CEA;
- video->ycbcr_coeff = COLOR_YCBCR601;
- } else if (vic) {
- video->dynamic_range = CEA;
- video->ycbcr_coeff = COLOR_YCBCR709;
- } else {
- video->dynamic_range = VESA;
- video->ycbcr_coeff = COLOR_YCBCR709;
- }
- /* Input vide bpc and color_formats */
- switch (display_info->bpc) {
- case 12:
- video->color_depth = COLOR_12;
- break;
- case 10:
- video->color_depth = COLOR_10;
- break;
- case 8:
- video->color_depth = COLOR_8;
- break;
- case 6:
- video->color_depth = COLOR_6;
- break;
- default:
- video->color_depth = COLOR_8;
- break;
- }
- if (display_info->color_formats & DRM_COLOR_FORMAT_YCRCB444)
- video->color_space = COLOR_YCBCR444;
- else if (display_info->color_formats & DRM_COLOR_FORMAT_YCRCB422)
- video->color_space = COLOR_YCBCR422;
- else
- video->color_space = COLOR_RGB;
- /*
- * NOTE: those property parsing code is used for providing backward
- * compatibility for samsung platform.
- * Due to we used the "of_property_read_u32" interfaces, when this
- * property isn't present, the "video_info" can keep the original
- * values and wouldn't be modified.
- */
- of_property_read_u32(dp_node, "samsung,color-space",
- &video->color_space);
- of_property_read_u32(dp_node, "samsung,dynamic-range",
- &video->dynamic_range);
- of_property_read_u32(dp_node, "samsung,ycbcr-coeff",
- &video->ycbcr_coeff);
- of_property_read_u32(dp_node, "samsung,color-depth",
- &video->color_depth);
- if (of_property_read_bool(dp_node, "hsync-active-high"))
- video->h_sync_polarity = true;
- if (of_property_read_bool(dp_node, "vsync-active-high"))
- video->v_sync_polarity = true;
- if (of_property_read_bool(dp_node, "interlaced"))
- video->interlaced = true;
- }
- static const struct drm_bridge_funcs analogix_dp_bridge_funcs = {
- .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
- .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
- .atomic_reset = drm_atomic_helper_bridge_reset,
- .atomic_pre_enable = analogix_dp_bridge_atomic_pre_enable,
- .atomic_enable = analogix_dp_bridge_atomic_enable,
- .atomic_disable = analogix_dp_bridge_atomic_disable,
- .atomic_post_disable = analogix_dp_bridge_atomic_post_disable,
- .mode_set = analogix_dp_bridge_mode_set,
- .attach = analogix_dp_bridge_attach,
- };
- static int analogix_dp_create_bridge(struct drm_device *drm_dev,
- struct analogix_dp_device *dp)
- {
- 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;
- bridge->driver_private = dp;
- bridge->funcs = &analogix_dp_bridge_funcs;
- ret = drm_bridge_attach(dp->encoder, bridge, NULL, 0);
- if (ret) {
- DRM_ERROR("failed to attach drm bridge\n");
- return -EINVAL;
- }
- return 0;
- }
- static int analogix_dp_dt_parse_pdata(struct analogix_dp_device *dp)
- {
- struct device_node *dp_node = dp->dev->of_node;
- struct video_info *video_info = &dp->video_info;
- switch (dp->plat_data->dev_type) {
- case RK3288_DP:
- case RK3399_EDP:
- /*
- * Like Rk3288 DisplayPort TRM indicate that "Main link
- * containing 4 physical lanes of 2.7/1.62 Gbps/lane".
- */
- video_info->max_link_rate = 0x0A;
- video_info->max_lane_count = 0x04;
- break;
- case EXYNOS_DP:
- /*
- * NOTE: those property parseing code is used for
- * providing backward compatibility for samsung platform.
- */
- of_property_read_u32(dp_node, "samsung,link-rate",
- &video_info->max_link_rate);
- of_property_read_u32(dp_node, "samsung,lane-count",
- &video_info->max_lane_count);
- break;
- }
- return 0;
- }
- static ssize_t analogix_dpaux_transfer(struct drm_dp_aux *aux,
- struct drm_dp_aux_msg *msg)
- {
- struct analogix_dp_device *dp = to_dp(aux);
- return analogix_dp_transfer(dp, msg);
- }
- struct analogix_dp_device *
- analogix_dp_probe(struct device *dev, struct analogix_dp_plat_data *plat_data)
- {
- struct platform_device *pdev = to_platform_device(dev);
- struct analogix_dp_device *dp;
- struct resource *res;
- unsigned int irq_flags;
- int ret;
- if (!plat_data) {
- dev_err(dev, "Invalided input plat_data\n");
- return ERR_PTR(-EINVAL);
- }
- dp = devm_kzalloc(dev, sizeof(struct analogix_dp_device), GFP_KERNEL);
- if (!dp)
- return ERR_PTR(-ENOMEM);
- dp->dev = &pdev->dev;
- dp->dpms_mode = DRM_MODE_DPMS_OFF;
- mutex_init(&dp->panel_lock);
- dp->panel_is_modeset = false;
- /*
- * platform dp driver need containor_of the plat_data to get
- * the driver private data, so we need to store the point of
- * plat_data, not the context of plat_data.
- */
- dp->plat_data = plat_data;
- ret = analogix_dp_dt_parse_pdata(dp);
- if (ret)
- return ERR_PTR(ret);
- 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 ERR_PTR(ret);
- }
- }
- dp->clock = devm_clk_get(&pdev->dev, "dp");
- if (IS_ERR(dp->clock)) {
- dev_err(&pdev->dev, "failed to get clock\n");
- return ERR_CAST(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 ERR_CAST(dp->reg_base);
- dp->force_hpd = of_property_read_bool(dev->of_node, "force-hpd");
- /* Try two different names */
- dp->hpd_gpiod = devm_gpiod_get_optional(dev, "hpd", GPIOD_IN);
- if (!dp->hpd_gpiod)
- dp->hpd_gpiod = devm_gpiod_get_optional(dev, "samsung,hpd",
- GPIOD_IN);
- if (IS_ERR(dp->hpd_gpiod)) {
- dev_err(dev, "error getting HDP GPIO: %ld\n",
- PTR_ERR(dp->hpd_gpiod));
- return ERR_CAST(dp->hpd_gpiod);
- }
- if (dp->hpd_gpiod) {
- /*
- * 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.
- */
- dp->irq = gpiod_to_irq(dp->hpd_gpiod);
- irq_flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING;
- } else {
- dp->irq = platform_get_irq(pdev, 0);
- irq_flags = 0;
- }
- if (dp->irq == -ENXIO) {
- dev_err(&pdev->dev, "failed to get irq\n");
- return ERR_PTR(-ENODEV);
- }
- ret = devm_request_threaded_irq(&pdev->dev, dp->irq,
- analogix_dp_hardirq,
- analogix_dp_irq_thread,
- irq_flags, "analogix-dp", dp);
- if (ret) {
- dev_err(&pdev->dev, "failed to request irq\n");
- return ERR_PTR(ret);
- }
- disable_irq(dp->irq);
- return dp;
- }
- EXPORT_SYMBOL_GPL(analogix_dp_probe);
- int analogix_dp_bind(struct analogix_dp_device *dp, struct drm_device *drm_dev)
- {
- int ret;
- dp->drm_dev = drm_dev;
- dp->encoder = dp->plat_data->encoder;
- dp->aux.name = "DP-AUX";
- dp->aux.transfer = analogix_dpaux_transfer;
- dp->aux.dev = dp->dev;
- ret = drm_dp_aux_register(&dp->aux);
- if (ret)
- return ret;
- pm_runtime_enable(dp->dev);
- ret = analogix_dp_create_bridge(drm_dev, dp);
- if (ret) {
- DRM_ERROR("failed to create bridge (%d)\n", ret);
- goto err_disable_pm_runtime;
- }
- return 0;
- err_disable_pm_runtime:
- pm_runtime_disable(dp->dev);
- return ret;
- }
- EXPORT_SYMBOL_GPL(analogix_dp_bind);
- void analogix_dp_unbind(struct analogix_dp_device *dp)
- {
- analogix_dp_bridge_disable(dp->bridge);
- dp->connector.funcs->destroy(&dp->connector);
- if (dp->plat_data->panel) {
- if (drm_panel_unprepare(dp->plat_data->panel))
- DRM_ERROR("failed to turnoff the panel\n");
- }
- drm_dp_aux_unregister(&dp->aux);
- pm_runtime_disable(dp->dev);
- }
- EXPORT_SYMBOL_GPL(analogix_dp_unbind);
- void analogix_dp_remove(struct analogix_dp_device *dp)
- {
- clk_disable_unprepare(dp->clock);
- }
- EXPORT_SYMBOL_GPL(analogix_dp_remove);
- #ifdef CONFIG_PM
- int analogix_dp_suspend(struct analogix_dp_device *dp)
- {
- clk_disable_unprepare(dp->clock);
- if (dp->plat_data->panel) {
- if (drm_panel_unprepare(dp->plat_data->panel))
- DRM_ERROR("failed to turnoff the panel\n");
- }
- return 0;
- }
- EXPORT_SYMBOL_GPL(analogix_dp_suspend);
- int analogix_dp_resume(struct analogix_dp_device *dp)
- {
- 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;
- }
- if (dp->plat_data->panel) {
- if (drm_panel_prepare(dp->plat_data->panel)) {
- DRM_ERROR("failed to setup the panel\n");
- return -EBUSY;
- }
- }
- return 0;
- }
- EXPORT_SYMBOL_GPL(analogix_dp_resume);
- #endif
- int analogix_dp_start_crc(struct drm_connector *connector)
- {
- struct analogix_dp_device *dp = to_dp(connector);
- if (!connector->state->crtc) {
- DRM_ERROR("Connector %s doesn't currently have a CRTC.\n",
- connector->name);
- return -EINVAL;
- }
- return drm_dp_start_crc(&dp->aux, connector->state->crtc);
- }
- EXPORT_SYMBOL_GPL(analogix_dp_start_crc);
- int analogix_dp_stop_crc(struct drm_connector *connector)
- {
- struct analogix_dp_device *dp = to_dp(connector);
- return drm_dp_stop_crc(&dp->aux);
- }
- EXPORT_SYMBOL_GPL(analogix_dp_stop_crc);
- MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
- MODULE_DESCRIPTION("Analogix DP Core Driver");
- MODULE_LICENSE("GPL v2");
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