Commit 0a145446 authored by Eric Yang's avatar Eric Yang Committed by Alex Deucher
Browse files

drm/amd/display: support access ddc for mst branch 



[Why]
Megachip dockings accesses ddc line through display driver when
installing FW. Previously, we would fail every transaction because
link attached to mst branch did not have their ddc transaction type
set.

[How]
Set ddc transaction type when mst branch is connected.

Signed-off-by: default avatarEric Yang <Eric.Yang2@amd.com>
Reviewed-by: default avatarCharlene Liu <Charlene.Liu@amd.com>
Acked-by: default avatarHarry Wentland <harry.wentland@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 91f191c7

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

+4 −0
Original line number Diff line number Diff line
@@ -498,6 +498,10 @@ static bool detect_dp( 
			sink_caps->signal = SIGNAL_TYPE_DISPLAY_PORT_MST;

			link->type = dc_connection_mst_branch;



			dal_ddc_service_set_transaction_type(

							link->ddc,

							sink_caps->transaction_type);



			/*

			 * This call will initiate MST topology discovery. Which

			 * will detect MST ports and add new DRM connector DRM