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drm/amd/display: remove PHY repeater count check for LTTPR mode

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[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 <daniel.wheeler@amd.com>
Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Sung Joon Kim <sungkim@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Sung Joon Kim
2022-01-23 13:20:11 -05:00
committed by Alex Deucher
parent 5f2c1192eb
commit 72b90723b3
1 changed files with 1 additions and 2 deletions
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3
drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
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@@ -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) {