[PATCH AUTOSEL 6.10 03/34] drm/amd/display: Add delay to improve LTTPR UHBR interop

Sasha Levin
2024-07-28T15:42:48Z

From: Michael Strauss <michael.strauss@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@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Michael Strauss <michael.strauss@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@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 3e6c7be7e2786..5302d2c9c7607 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,
--
2.43.0