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

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[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: Eric Yang <Eric.Yang2@amd.com>
Reviewed-by: Charlene Liu <Charlene.Liu@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Eric Yang 2018-06-12 18:37:12 -04:00 committed by Alex Deucher
parent 91f191c74e
commit 0a14544661
1 changed files with 4 additions and 0 deletions
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4
drivers/gpu/drm/amd/display/dc/core/dc_link.c
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@ -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