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 <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>

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 (file)
--- 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) {