diff options
| author |   George Shen <George.Shen@amd.com> | 2021-11-19 11:09:37 -0500 |
|---|---|---|
| committer |   Alex Deucher <alexander.deucher@amd.com> | 2021-12-01 16:06:44 -0500 |
| commit | ee347d5b40a14dd9a80dfb2bf4d2c5b3b4367135 (patch) | |
| tree | be589c257ff7e2ad795e623cb5e03a8f008b480d /drivers/gpu/drm | |
| parent | drm/amd/display: Add force detile buffer size debug flag (diff) | |
drm/amd/display: Add 16ms AUX RD interval W/A for specific LTTPR
[Why]
Certain display configurations require an extra delay before
reading lane status with certain LTTPR.
[How]
Add temporary workaround to force AUX RD interval to
16ms for CR and EQ. Needs to be refactored later.
Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: George Shen <George.Shen@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm')
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c index 81b0a01615c3..62510b643882 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c @@ -1384,6 +1384,12 @@ static enum link_training_result perform_channel_equalization_sequence( dp_translate_training_aux_read_interval( link->dpcd_caps.lttpr_caps.aux_rd_interval[offset - 1]); + if (link->dc->debug.apply_vendor_specific_lttpr_wa && + (link->chip_caps & EXT_DISPLAY_PATH_CAPS__DP_FIXED_VS_EN) && + link->lttpr_mode == LTTPR_MODE_TRANSPARENT) { + wait_time_microsec = 16000; + } + dp_wait_for_training_aux_rd_interval( link, wait_time_microsec); @@ -1487,6 +1493,12 @@ static enum link_training_result perform_clock_recovery_sequence( if (link->lttpr_mode == LTTPR_MODE_NON_TRANSPARENT) wait_time_microsec = TRAINING_AUX_RD_INTERVAL; + if (link->dc->debug.apply_vendor_specific_lttpr_wa && + (link->chip_caps & EXT_DISPLAY_PATH_CAPS__DP_FIXED_VS_EN) && + link->lttpr_mode == LTTPR_MODE_TRANSPARENT) { + wait_time_microsec = 16000; + } + dp_wait_for_training_aux_rd_interval( link, wait_time_microsec); |