drm/amd/display: Limit max link cap with LTTPR caps

[Why]
Max link rate should be limited to the maximum link rate support by any
LTTPR that are connected, including when operating in transparent mode.

[How]
Include transparent mode when factoring in LTTPR max supported link
rate.

Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Reviewed-by: Wesley Chalmers <wesley.chalmers@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: George Shen <George.Shen@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 8a35370..6f552f7 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
@@ -2873,7 +2873,7 @@ static struct dc_link_settings get_max_link_cap(struct dc_link *link)
         * account for lttpr repeaters cap
         * notes: repeaters do not snoop in the DPRX Capabilities addresses (3.6.3).
         */
-       if (link->lttpr_mode == LTTPR_MODE_NON_TRANSPARENT) {
+       if (link->lttpr_mode != LTTPR_MODE_NON_LTTPR) {
                if (link->dpcd_caps.lttpr_caps.max_lane_count < max_link_cap.lane_count)
                        max_link_cap.lane_count = link->dpcd_caps.lttpr_caps.max_lane_count;