Commit a1c9a1e2 authored by Peichen Huang's avatar Peichen Huang Committed by Alex Deucher
Browse files

drm/amd/display: skip CLEAR_PAYLOAD_ID_TABLE if device mst_en is 0 



[Why]
Some dock and mst monitor don't like to receive CLEAR_PAYLOAD_ID_TABLE
when mst_en is set to 0. It doesn't make sense to do so in source
side, either.

[How]
Don't send CLEAR_PAYLOAD_ID_TABLE if mst_en is 0

Reviewed-by: default avatarGeorge Shen <George.Shen@amd.com>
Acked-by: default avatarQingqing Zhuo <qingqing.zhuo@amd.com>
Signed-off-by: default avatarPeichen Huang <PeiChen.Huang@amd.com>
Tested-by: default avatarDaniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 0cdf91bf

drivers/gpu/drm/amd/display/dc/link/link_dpms.c

+4 −1
Original line number Diff line number Diff line
@@ -2160,6 +2160,7 @@ static enum dc_status enable_link_dp_mst( 
		struct pipe_ctx *pipe_ctx)

{

	struct dc_link *link = pipe_ctx->stream->link;

	unsigned char mstm_cntl;



	/* sink signal type after MST branch is MST. Multiple MST sinks

	 * share one link. Link DP PHY is enable or training only once.
@@ -2168,6 +2169,8 @@ static enum dc_status enable_link_dp_mst( 
		return DC_OK;



	/* clear payload table */

	core_link_read_dpcd(link, DP_MSTM_CTRL, &mstm_cntl, 1);

	if (mstm_cntl & DP_MST_EN)

		dm_helpers_dp_mst_clear_payload_allocation_table(link->ctx, link);



	/* to make sure the pending down rep can be processed