Commit 6016cd9d authored by Bing Guo's avatar Bing Guo Committed by Alex Deucher
Browse files

drm/amd/display: add helper for enabling mst stream features 



[Why]
Some MST devices uses different method to enable mst
specific stream features.

[How]
Add dm_helpers_mst_enable_stream features. This can be
modified later when we are ready to implement those features.

Signed-off-by: default avatarBing Guo <bing.guo@amd.com>
Reviewed-by: default avatarAnthony Koo <Anthony.Koo@amd.com>
Acked-by: default avatarAurabindo Pillai <aurabindo.pillai@amd.com>
Tested-by: default avatarDaniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent fdf7d4f5

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c

+25 −0
Original line number Diff line number Diff line
@@ -711,3 +711,28 @@ bool dm_helpers_dmub_outbox0_interrupt_control(struct dc_context *ctx, bool enab 
			 enable ? "en" : "dis", ret);

	return ret;

}



void dm_helpers_mst_enable_stream_features(const struct dc_stream_state *stream)

{

	/* TODO: virtual DPCD */

	struct dc_link *link = stream->link;

	union down_spread_ctrl old_downspread;

	union down_spread_ctrl new_downspread;



	if (link->aux_access_disabled)

		return;



	if (!dm_helpers_dp_read_dpcd(link->ctx, link, DP_DOWNSPREAD_CTRL,

				     &old_downspread.raw,

				     sizeof(old_downspread)))

		return;



	new_downspread.raw = old_downspread.raw;

	new_downspread.bits.IGNORE_MSA_TIMING_PARAM =

		(stream->ignore_msa_timing_param) ? 1 : 0;



	if (new_downspread.raw != old_downspread.raw)

		dm_helpers_dp_write_dpcd(link->ctx, link, DP_DOWNSPREAD_CTRL,

					 &new_downspread.raw,

					 sizeof(new_downspread));

}

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

+17 −11
Original line number Diff line number Diff line
@@ -1679,6 +1679,8 @@ void link_destroy(struct dc_link **link) 
static void enable_stream_features(struct pipe_ctx *pipe_ctx)

{

	struct dc_stream_state *stream = pipe_ctx->stream;



	if (pipe_ctx->stream->signal != SIGNAL_TYPE_DISPLAY_PORT_MST) {

		struct dc_link *link = stream->link;

		union down_spread_ctrl old_downspread;

		union down_spread_ctrl new_downspread;
@@ -1695,6 +1697,10 @@ static void enable_stream_features(struct pipe_ctx *pipe_ctx) 
			core_link_write_dpcd(link, DP_DOWNSPREAD_CTRL,

				&new_downspread.raw, sizeof(new_downspread));

		}



	} else {

		dm_helpers_mst_enable_stream_features(stream);

	}

}



static enum dc_status enable_link_dp(struct dc_state *state,

drivers/gpu/drm/amd/display/dc/dm_helpers.h

+2 −0
Original line number Diff line number Diff line
@@ -147,6 +147,8 @@ bool dm_helpers_dp_write_dsc_enable( 
bool dm_helpers_is_dp_sink_present(

		struct dc_link *link);



void dm_helpers_mst_enable_stream_features(const struct dc_stream_state *stream);



enum dc_edid_status dm_helpers_read_local_edid(

		struct dc_context *ctx,

		struct dc_link *link,