From: Sung Joon Kim Date: Sun, 23 Jan 2022 18:20:11 +0000 (-0500) Subject: drm/amd/display: remove PHY repeater count check for LTTPR mode X-Git-Tag: v5.18-rc1~109^2~22^2~186 X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=72b90723b3760c69721b04f59436f38cd215e2df;p=linux-2.6-block.git 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 --- 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 062bdbadc781..538ace042961 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) {