From 72b90723b3760c69721b04f59436f38cd215e2df Mon Sep 17 00:00:00 2001 From: Sung Joon Kim Date: Sun, 23 Jan 2022 13:20:11 -0500 Subject: [PATCH] drm/amd/display: remove PHY repeater count check for LTTPR mode [why] Due to bad hardware, the PHY repeater count in LTTPR cap is read as 0xFF in some monitors while the LTTPR is actually present. [how] Remove PHY repeater counter check when configuring LTTPR mode. Tested-by: Daniel Wheeler Reviewed-by: Jun Lei Acked-by: Rodrigo Siqueira Signed-off-by: Sung Joon Kim Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | 3 +-- 1 file changed, 1 insertion(+), 2 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 062bdba..538ace0 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 @@ -5069,9 +5069,8 @@ bool dp_retrieve_lttpr_cap(struct dc_link *link) DP_LT_TUNABLE_PHY_REPEATER_FIELD_DATA_STRUCTURE_REV]; /* Attempt to train in LTTPR transparent mode if repeater count exceeds 8. */ - is_lttpr_present = (dp_convert_to_count(link->dpcd_caps.lttpr_caps.phy_repeater_cnt) != 0 && + is_lttpr_present = (link->dpcd_caps.lttpr_caps.max_lane_count > 0 && link->dpcd_caps.lttpr_caps.phy_repeater_cnt < 0xff && - link->dpcd_caps.lttpr_caps.max_lane_count > 0 && link->dpcd_caps.lttpr_caps.max_lane_count <= 4 && link->dpcd_caps.lttpr_caps.revision.raw >= 0x14); if (is_lttpr_present) { -- 2.7.4