diff options
| author | Michael Strauss <[email protected]> | 2024-04-09 12:00:34 -0400 |
|---|---|---|
| committer | Alex Deucher <[email protected]> | 2024-04-30 09:46:00 -0400 |
| commit | 10839ee6a977ed1f7d0f4deb29f2d7e5d1f2a9dd (patch) | |
| tree | f04d590fee7bd2bd85fd9478bdfd04221411f100 | |
| parent | 239b31bd5c3fef3698440bf6436b2068c6bb08a3 (diff) | |
drm/amd/display: Add delay to improve LTTPR UHBR interop
[WHY]
Avoid race condition which puts LTTPR into bad state during UHBR LT.
[HOW]
Delay 30ms between starting UHBR TPS1 PHY output and sending TPS1 via DPCD.
Reviewed-by: Wenjing Liu <[email protected]>
Acked-by: Aurabindo Pillai <[email protected]>
Signed-off-by: Michael Strauss <[email protected]>
Tested-by: Daniel Wheeler <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/link/hwss/link_hwss_hpo_fixed_vs_pe_retimer_dp.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/link/hwss/link_hwss_hpo_fixed_vs_pe_retimer_dp.c b/drivers/gpu/drm/amd/display/dc/link/hwss/link_hwss_hpo_fixed_vs_pe_retimer_dp.c index 3e6c7be7e278..5302d2c9c760 100644 --- a/drivers/gpu/drm/amd/display/dc/link/hwss/link_hwss_hpo_fixed_vs_pe_retimer_dp.c +++ b/drivers/gpu/drm/amd/display/dc/link/hwss/link_hwss_hpo_fixed_vs_pe_retimer_dp.c @@ -165,7 +165,12 @@ static void set_hpo_fixed_vs_pe_retimer_dp_link_test_pattern(struct dc_link *lin link_res->hpo_dp_link_enc->funcs->set_link_test_pattern( link_res->hpo_dp_link_enc, tp_params); } + link->dc->link_srv->dp_trace_source_sequence(link, DPCD_SOURCE_SEQ_AFTER_SET_SOURCE_PATTERN); + + // Give retimer extra time to lock before updating DP_TRAINING_PATTERN_SET to TPS1 + if (tp_params->dp_phy_pattern == DP_TEST_PATTERN_128b_132b_TPS1_TRAINING_MODE) + msleep(30); } static void set_hpo_fixed_vs_pe_retimer_dp_lane_settings(struct dc_link *link, |