drm/amd/display: Mode change with same timing causing long display blank

[Why]
What a mode change is requested for the same timing a full stream reset
can occur in some cases which causes monitor to blank for a few seconds.

[How]
Do not consider infoframe updates as needing a full stream reset as they
will be handled on the first flip after a modeset when surface
information is available.
Signed-off-by: Aric Cyr <aric.cyr@amd.com>
Reviewed-by: Anthony Koo <Anthony.Koo@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -1547,35 +1547,6 @@ bool dc_add_all_planes_for_stream(
 	return add_all_planes_for_stream(dc, stream, &set, 1, context);
 }
 
-
-static bool is_hdr_static_meta_changed(struct dc_stream_state *cur_stream,
-	struct dc_stream_state *new_stream)
-{
-	if (cur_stream == NULL)
-		return true;
-
-	if (memcmp(&cur_stream->hdr_static_metadata,
-			&new_stream->hdr_static_metadata,
-			sizeof(struct dc_info_packet)) != 0)
-		return true;
-
-	return false;
-}
-
-static bool is_vsc_info_packet_changed(struct dc_stream_state *cur_stream,
-		struct dc_stream_state *new_stream)
-{
-	if (cur_stream == NULL)
-		return true;
-
-	if (memcmp(&cur_stream->vsc_infopacket,
-			&new_stream->vsc_infopacket,
-			sizeof(struct dc_info_packet)) != 0)
-		return true;
-
-	return false;
-}
-
 static bool is_timing_changed(struct dc_stream_state *cur_stream,
 		struct dc_stream_state *new_stream)
 {
@@ -1610,15 +1581,9 @@ static bool are_stream_backends_same(
 	if (is_timing_changed(stream_a, stream_b))
 		return false;
 
-	if (is_hdr_static_meta_changed(stream_a, stream_b))
-		return false;
-
 	if (stream_a->dpms_off != stream_b->dpms_off)
 		return false;
 
-	if (is_vsc_info_packet_changed(stream_a, stream_b))
-		return false;
-
 	return true;
 }
 
@@ -1758,21 +1723,6 @@ static struct audio *find_first_free_audio(
 	return 0;
 }
 
-bool resource_is_stream_unchanged(
-	struct dc_state *old_context, struct dc_stream_state *stream)
-{
-	int i;
-
-	for (i = 0; i < old_context->stream_count; i++) {
-		struct dc_stream_state *old_stream = old_context->streams[i];
-
-		if (are_stream_backends_same(old_stream, stream))
-				return true;
-	}
-
-	return false;
-}
-
 /**
  * dc_add_stream_to_ctx() - Add a new dc_stream_state to a dc_state.
  */
@@ -2027,17 +1977,6 @@ enum dc_status resource_map_pool_resources(
 	int pipe_idx = -1;
 	struct dc_bios *dcb = dc->ctx->dc_bios;
 
-	/* TODO Check if this is needed */
-	/*if (!resource_is_stream_unchanged(old_context, stream)) {
-			if (stream != NULL && old_context->streams[i] != NULL) {
-				stream->bit_depth_params =
-						old_context->streams[i]->bit_depth_params;
-				stream->clamping = old_context->streams[i]->clamping;
-				continue;
-			}
-		}
-	*/
-
 	calculate_phy_pix_clks(stream);
 
 	/* TODO: Check Linux */
@@ -2720,15 +2659,9 @@ bool pipe_need_reprogram(
 	if (is_timing_changed(pipe_ctx_old->stream, pipe_ctx->stream))
 		return true;
 
-	if (is_hdr_static_meta_changed(pipe_ctx_old->stream, pipe_ctx->stream))
-		return true;
-
 	if (pipe_ctx_old->stream->dpms_off != pipe_ctx->stream->dpms_off)
 		return true;
 
-	if (is_vsc_info_packet_changed(pipe_ctx_old->stream, pipe_ctx->stream))
-		return true;
-
 	if (false == pipe_ctx_old->stream->link->link_state_valid &&
 		false == pipe_ctx_old->stream->dpms_off)
 		return true;

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_resource.c

@@ -1121,24 +1121,6 @@ static enum dc_status build_mapped_resource(
 {
 	struct pipe_ctx *pipe_ctx = resource_get_head_pipe_for_stream(&context->res_ctx, stream);
 
-	/*TODO Seems unneeded anymore */
-	/*	if (old_context && resource_is_stream_unchanged(old_context, stream)) {
-			if (stream != NULL && old_context->streams[i] != NULL) {
-				 todo: shouldn't have to copy missing parameter here
-				resource_build_bit_depth_reduction_params(stream,
-						&stream->bit_depth_params);
-				stream->clamping.pixel_encoding =
-						stream->timing.pixel_encoding;
-
-				resource_build_bit_depth_reduction_params(stream,
-								&stream->bit_depth_params);
-				build_clamping_params(stream);
-
-				continue;
-			}
-		}
-	*/
-
 	if (!pipe_ctx)
 		return DC_ERROR_UNEXPECTED;
 

drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c

@@ -1653,24 +1653,6 @@ enum dc_status dcn20_build_mapped_resource(const struct dc *dc, struct dc_state
 	enum dc_status status = DC_OK;
 	struct pipe_ctx *pipe_ctx = resource_get_head_pipe_for_stream(&context->res_ctx, stream);
 
-	/*TODO Seems unneeded anymore */
-	/*	if (old_context && resource_is_stream_unchanged(old_context, stream)) {
-			if (stream != NULL && old_context->streams[i] != NULL) {
-				 todo: shouldn't have to copy missing parameter here
-				resource_build_bit_depth_reduction_params(stream,
-						&stream->bit_depth_params);
-				stream->clamping.pixel_encoding =
-						stream->timing.pixel_encoding;
-
-				resource_build_bit_depth_reduction_params(stream,
-								&stream->bit_depth_params);
-				build_clamping_params(stream);
-
-				continue;
-			}
-		}
-	*/
-
 	if (!pipe_ctx)
 		return DC_ERROR_UNEXPECTED;
 

drivers/gpu/drm/amd/display/dc/inc/resource.h

@@ -138,9 +138,6 @@ struct pipe_ctx *find_idle_secondary_pipe(
 		const struct resource_pool *pool,
 		const struct pipe_ctx *primary_pipe);
 
-bool resource_is_stream_unchanged(
-	struct dc_state *old_context, struct dc_stream_state *stream);
-
 bool resource_validate_attach_surfaces(
 		const struct dc_validation_set set[],
 		int set_count,