Commit 8a21da28 authored by Peichen Huang's avatar Peichen Huang Committed by Alex Deucher
Browse files

drm/amd/display: not abort link train when bw is low 



[WHY]
DP tunneling should not abort link train even bandwidth become
too low after downgrade. Otherwise, it would fail compliance test.

[HOW}
Do link train with downgrade settings even bandwidth is not enough

Reviewed-by: default avatarCruise Hung <cruise.hung@amd.com>
Reviewed-by: default avatarMeenakshikumar Somasundaram <meenakshikumar.somasundaram@amd.com>
Signed-off-by: default avatarPeichen Huang <PeiChen.Huang@amd.com>
Signed-off-by: default avatarTom Chung <chiahsuan.chung@amd.com>
Tested-by: default avatarDaniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent bd00b29b

drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training.c

+1 −4
Original line number Diff line number Diff line
@@ -1789,13 +1789,10 @@ bool perform_link_training_with_retries( 
			is_link_bw_min = ((cur_link_settings.link_rate <= LINK_RATE_LOW) &&

				(cur_link_settings.lane_count <= LANE_COUNT_ONE));



			if (is_link_bw_low) {

			if (is_link_bw_low)

				DC_LOG_WARNING(

					"%s: Link(%d) bandwidth too low after fallback req_bw(%d) > link_bw(%d)\n",

					__func__, link->link_index, req_bw, link_bw);



				return false;

			}

		}



		msleep(delay_between_attempts);