drm/amd/display: Fix Mismatch between pipe and stream

[Why]
Failing mode validation during dc_commit, leading to blackscreen with an
8k DP2 display during mode change.

[What]
Fix mixmatch between pipe and stream, which prevented us from
recognizing the link as DP2.
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Reviewed-by: Dmytro Laktyushkin <dmytro.laktyushkin@amd.com>
Acked-by: Rodrigo Siqueira <rodrigo.siqueira@amd.com>
Signed-off-by: Gabe Teeger <gabe.teeger@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dml2/dml2_translation_helper.c

@@ -1049,9 +1049,10 @@ static void dml2_populate_pipe_to_plane_index_mapping(struct dml2_context *dml2,
 
 void map_dc_state_into_dml_display_cfg(struct dml2_context *dml2, struct dc_state *context, struct dml_display_cfg_st *dml_dispcfg)
 {
-	int i = 0, j = 0;
+	int i = 0, j = 0, k = 0;
 	int disp_cfg_stream_location, disp_cfg_plane_location;
 	enum mall_stream_type stream_mall_type;
+	struct pipe_ctx *current_pipe_context;
 
 	for (i = 0; i < __DML2_WRAPPER_MAX_STREAMS_PLANES__; i++) {
 		dml2->v20.scratch.dml_to_dc_pipe_mapping.disp_cfg_to_stream_id_valid[i] = false;
@@ -1071,6 +1072,15 @@ void map_dc_state_into_dml_display_cfg(struct dml2_context *dml2, struct dc_stat
 	dml2_populate_pipe_to_plane_index_mapping(dml2, context);
 
 	for (i = 0; i < context->stream_count; i++) {
+		current_pipe_context = NULL;
+		for (k = 0; k < MAX_PIPES; k++) {
+			/* find one pipe allocated to this stream for the purpose of getting
+			info about the link later */
+			if (context->streams[i] == context->res_ctx.pipe_ctx[k].stream) {
+				current_pipe_context = &context->res_ctx.pipe_ctx[k];
+				break;
+			}
+		}
 		disp_cfg_stream_location = map_stream_to_dml_display_cfg(dml2, context->streams[i], dml_dispcfg);
 		stream_mall_type = dc_state_get_stream_subvp_type(context, context->streams[i]);
 
@@ -1080,7 +1090,7 @@ void map_dc_state_into_dml_display_cfg(struct dml2_context *dml2, struct dc_stat
 		ASSERT(disp_cfg_stream_location >= 0 && disp_cfg_stream_location <= __DML2_WRAPPER_MAX_STREAMS_PLANES__);
 
 		populate_dml_timing_cfg_from_stream_state(&dml_dispcfg->timing, disp_cfg_stream_location, context->streams[i]);
-		populate_dml_output_cfg_from_stream_state(&dml_dispcfg->output, disp_cfg_stream_location, context->streams[i], &context->res_ctx.pipe_ctx[i]);
+		populate_dml_output_cfg_from_stream_state(&dml_dispcfg->output, disp_cfg_stream_location, context->streams[i], current_pipe_context);
 		switch (context->streams[i]->debug.force_odm_combine_segments) {
 		case 2:
 			dml2->v20.dml_core_ctx.policy.ODMUse[disp_cfg_stream_location] = dml_odm_use_policy_combine_2to1;
@@ -1137,7 +1147,7 @@ void map_dc_state_into_dml_display_cfg(struct dml2_context *dml2, struct dc_stat
 
 				if (j >= 1) {
 					populate_dml_timing_cfg_from_stream_state(&dml_dispcfg->timing, disp_cfg_plane_location, context->streams[i]);
-					populate_dml_output_cfg_from_stream_state(&dml_dispcfg->output, disp_cfg_plane_location, context->streams[i], &context->res_ctx.pipe_ctx[i]);
+					populate_dml_output_cfg_from_stream_state(&dml_dispcfg->output, disp_cfg_plane_location, context->streams[i], current_pipe_context);
 					switch (context->streams[i]->debug.force_odm_combine_segments) {
 					case 2:
 						dml2->v20.dml_core_ctx.policy.ODMUse[disp_cfg_plane_location] = dml_odm_use_policy_combine_2to1;

drivers/gpu/drm/amd/display/dc/dml2/dml2_utils.c

@@ -155,12 +155,12 @@ unsigned int dml2_util_get_maximum_odm_combine_for_output(bool force_odm_4to1, e
 
 bool is_dp2p0_output_encoder(const struct pipe_ctx *pipe_ctx)
 {
+	if (pipe_ctx == NULL || pipe_ctx->stream == NULL)
+		return false;
+
 	/* If this assert is hit then we have a link encoder dynamic management issue */
 	ASSERT(pipe_ctx->stream_res.hpo_dp_stream_enc ? pipe_ctx->link_res.hpo_dp_link_enc != NULL : true);
 
-	if (pipe_ctx->stream == NULL)
-		return false;
-
 	/* Count MST hubs once by treating only 1st remote sink in topology as an encoder */
 	if (pipe_ctx->stream->link && pipe_ctx->stream->link->remote_sinks[0]) {
 		return (pipe_ctx->stream_res.hpo_dp_stream_enc &&