[PATCH AUTOSEL 6.6 01/20] drm/amd/display: Add delay to improve LTTPR UHBR interop

[Sasha Levin]

From: Michael Strauss <michael.strauss at amd.com>

[ Upstream commit 10839ee6a977ed1f7d0f4deb29f2d7e5d1f2a9dd ]

[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 <wenjing.liu at amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai at amd.com>
Signed-off-by: Michael Strauss <michael.strauss at amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler at amd.com>
Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
Signed-off-by: Sasha Levin <sashal at kernel.org>
---
 .../dc/link/hwss/link_hwss_hpo_fixed_vs_pe_retimer_dp.c      | 5 +++++
 1 file changed, 5 insertions(+)

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 b621b97711b61..a7f5b0f6272ce 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
@@ -162,7 +162,12 @@ 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,
-- 
2.43.0