From: Kuogee Hsieh khsieh@codeaurora.org

Some DP sinkers prefer to use tps4 instead of tps3 during training #2. This patch will use tps4 to perform link training #2 if sinker's DPCD supports it.

Changes in V2: -- replace dp_catalog_ctrl_set_pattern() with dp_catalog_ctrl_set_pattern_state_bit()

Signed-off-by: Kuogee Hsieh quic_khsieh@quicinc.com --- drivers/gpu/drm/msm/dp/dp_catalog.c | 12 ++++++------ drivers/gpu/drm/msm/dp/dp_catalog.h | 2 +- drivers/gpu/drm/msm/dp/dp_ctrl.c | 19 ++++++++++++++----- 3 files changed, 21 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/msm/dp/dp_catalog.c b/drivers/gpu/drm/msm/dp/dp_catalog.c index 6ae9b29..64f0b26 100644 --- a/drivers/gpu/drm/msm/dp/dp_catalog.c +++ b/drivers/gpu/drm/msm/dp/dp_catalog.c @@ -456,19 +456,19 @@ void dp_catalog_ctrl_config_msa(struct dp_catalog *dp_catalog, dp_write_p0(catalog, MMSS_DP_DSC_DTO, 0x0); }

-int dp_catalog_ctrl_set_pattern(struct dp_catalog *dp_catalog, - u32 pattern) +int dp_catalog_ctrl_set_pattern_state_bit(struct dp_catalog *dp_catalog, + u32 state_bit) { int bit, ret; u32 data; struct dp_catalog_private *catalog = container_of(dp_catalog, struct dp_catalog_private, dp_catalog);

- bit = BIT(pattern - 1); - DRM_DEBUG_DP("hw: bit=%d train=%d\n", bit, pattern); + bit = BIT(state_bit - 1); + DRM_DEBUG_DP("hw: bit=%d train=%d\n", bit, state_bit); dp_catalog_ctrl_state_ctrl(dp_catalog, bit);

- bit = BIT(pattern - 1) << DP_MAINLINK_READY_LINK_TRAINING_SHIFT; + bit = BIT(state_bit - 1) << DP_MAINLINK_READY_LINK_TRAINING_SHIFT;

/* Poll for mainlink ready status */ ret = readx_poll_timeout(readl, catalog->io->dp_controller.link.base + @@ -476,7 +476,7 @@ int dp_catalog_ctrl_set_pattern(struct dp_catalog *dp_catalog, data, data & bit, POLLING_SLEEP_US, POLLING_TIMEOUT_US); if (ret < 0) { - DRM_ERROR("set pattern for link_train=%d failed\n", pattern); + DRM_ERROR("set state_bit for link_train=%d failed\n", state_bit); return ret; } return 0; diff --git a/drivers/gpu/drm/msm/dp/dp_catalog.h b/drivers/gpu/drm/msm/dp/dp_catalog.h index 6965afa..7dea101 100644 --- a/drivers/gpu/drm/msm/dp/dp_catalog.h +++ b/drivers/gpu/drm/msm/dp/dp_catalog.h @@ -94,7 +94,7 @@ void dp_catalog_ctrl_mainlink_ctrl(struct dp_catalog *dp_catalog, bool enable); void dp_catalog_ctrl_config_misc(struct dp_catalog *dp_catalog, u32 cc, u32 tb); void dp_catalog_ctrl_config_msa(struct dp_catalog *dp_catalog, u32 rate, u32 stream_rate_khz, bool fixed_nvid); -int dp_catalog_ctrl_set_pattern(struct dp_catalog *dp_catalog, u32 pattern); +int dp_catalog_ctrl_set_pattern_state_bit(struct dp_catalog *dp_catalog, u32 pattern); void dp_catalog_ctrl_reset(struct dp_catalog *dp_catalog); bool dp_catalog_ctrl_mainlink_ready(struct dp_catalog *dp_catalog); void dp_catalog_ctrl_enable_irq(struct dp_catalog *dp_catalog, bool enable); diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.c b/drivers/gpu/drm/msm/dp/dp_ctrl.c index 39558a2..da6c083 100644 --- a/drivers/gpu/drm/msm/dp/dp_ctrl.c +++ b/drivers/gpu/drm/msm/dp/dp_ctrl.c @@ -1078,12 +1078,13 @@ static int dp_ctrl_link_train_1(struct dp_ctrl_private *ctrl, int tries, old_v_level, ret = 0; u8 link_status[DP_LINK_STATUS_SIZE]; int const maximum_retries = 4; + char state_ctrl_bit = 1;

dp_catalog_ctrl_state_ctrl(ctrl->catalog, 0);

*training_step = DP_TRAINING_1;

- ret = dp_catalog_ctrl_set_pattern(ctrl->catalog, DP_TRAINING_PATTERN_1); + ret = dp_catalog_ctrl_set_pattern_state_bit(ctrl->catalog, state_ctrl_bit); if (ret) return ret; dp_ctrl_train_pattern_set(ctrl, DP_TRAINING_PATTERN_1 | @@ -1181,7 +1182,7 @@ static int dp_ctrl_link_train_2(struct dp_ctrl_private *ctrl, int *training_step) { int tries = 0, ret = 0; - char pattern; + char pattern, state_ctrl_bit; int const maximum_retries = 5; u8 link_status[DP_LINK_STATUS_SIZE];

@@ -1189,12 +1190,20 @@ static int dp_ctrl_link_train_2(struct dp_ctrl_private *ctrl,

*training_step = DP_TRAINING_2;

- if (drm_dp_tps3_supported(ctrl->panel->dpcd)) + if (drm_dp_tps4_supported(ctrl->panel->dpcd)) { + pattern = DP_TRAINING_PATTERN_4; + state_ctrl_bit = 4; + } + else if (drm_dp_tps3_supported(ctrl->panel->dpcd)) { pattern = DP_TRAINING_PATTERN_3; - else + state_ctrl_bit = 3; + } + else { pattern = DP_TRAINING_PATTERN_2; + state_ctrl_bit = 2; + }

- ret = dp_catalog_ctrl_set_pattern(ctrl->catalog, pattern); + ret = dp_catalog_ctrl_set_pattern_state_bit(ctrl->catalog, state_ctrl_bit); if (ret) return ret;