Commit fddb0245 authored by George Shen's avatar George Shen Committed by Alex Deucher
Browse files

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: default avatarDaniel Wheeler <daniel.wheeler@amd.com>
Reviewed-by: default avatarWesley Chalmers <wesley.chalmers@amd.com>
Acked-by: default avatarRodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: default avatarGeorge Shen <George.Shen@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent bf252ce1

drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c

+1 −1
Original line number Diff line number Diff line
@@ -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;