drm/amd/display: For SubVP pipe split case use min transition into MPO

[Description]
- For SubVP pipe split case we need to use a minimial transition
  when opening MPO video since we are transitioning from 4 pipes
  to 3 pipes where an OPP for a previous MPCC will change
- Also save and restore mall config when doing fast_validate in case
  there was a shallow copy of the dc->current_state
Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Hamza Mahfooz <hamza.mahfooz@amd.com>
Signed-off-by: Alvin Lee <Alvin.Lee2@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -3564,6 +3564,7 @@ static bool could_mpcc_tree_change_for_active_pipes(struct dc *dc,
 
 	struct dc_stream_status *cur_stream_status = stream_get_status(dc->current_state, stream);
 	bool force_minimal_pipe_splitting = false;
+	uint32_t i;
 
 	*is_plane_addition = false;
 
@@ -3595,6 +3596,36 @@ static bool could_mpcc_tree_change_for_active_pipes(struct dc *dc,
 		}
 	}
 
+	/* For SubVP pipe split case when adding MPO video
+	 * we need to add a minimal transition. In this case
+	 * there will be 2 streams (1 main stream, 1 phantom
+	 * stream).
+	 */
+	if (cur_stream_status &&
+			dc->current_state->stream_count == 2 &&
+			stream->mall_stream_config.type == SUBVP_MAIN) {
+		bool is_pipe_split = false;
+
+		for (i = 0; i < dc->res_pool->pipe_count; i++) {
+			if (dc->current_state->res_ctx.pipe_ctx[i].stream == stream &&
+					(dc->current_state->res_ctx.pipe_ctx[i].bottom_pipe ||
+					dc->current_state->res_ctx.pipe_ctx[i].next_odm_pipe)) {
+				is_pipe_split = true;
+				break;
+			}
+		}
+
+		/* determine if minimal transition is required due to SubVP*/
+		if (surface_count > 0 && is_pipe_split) {
+			if (cur_stream_status->plane_count > surface_count) {
+				force_minimal_pipe_splitting = true;
+			} else if (cur_stream_status->plane_count < surface_count) {
+				force_minimal_pipe_splitting = true;
+				*is_plane_addition = true;
+			}
+		}
+	}
+
 	return force_minimal_pipe_splitting;
 }
 
@@ -3604,6 +3635,7 @@ static bool commit_minimal_transition_state(struct dc *dc,
 	struct dc_state *transition_context = dc_create_state(dc);
 	enum pipe_split_policy tmp_mpc_policy;
 	bool temp_dynamic_odm_policy;
+	bool temp_subvp_policy;
 	enum dc_status ret = DC_ERROR_UNEXPECTED;
 	unsigned int i, j;
 
@@ -3618,6 +3650,9 @@ static bool commit_minimal_transition_state(struct dc *dc,
 	temp_dynamic_odm_policy = dc->debug.enable_single_display_2to1_odm_policy;
 	dc->debug.enable_single_display_2to1_odm_policy = false;
 
+	temp_subvp_policy = dc->debug.force_disable_subvp;
+	dc->debug.force_disable_subvp = true;
+
 	dc_resource_state_copy_construct(transition_base_context, transition_context);
 
 	//commit minimal state
@@ -3646,6 +3681,7 @@ static bool commit_minimal_transition_state(struct dc *dc,
 		dc->debug.pipe_split_policy = tmp_mpc_policy;
 
 	dc->debug.enable_single_display_2to1_odm_policy = temp_dynamic_odm_policy;
+	dc->debug.force_disable_subvp = temp_subvp_policy;
 
 	if (ret != DC_OK) {
 		/*this should never happen*/

drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.c

@@ -1798,14 +1798,32 @@ bool dcn32_validate_bandwidth(struct dc *dc,
 	int vlevel = 0;
 	int pipe_cnt = 0;
 	display_e2e_pipe_params_st *pipes = kzalloc(dc->res_pool->pipe_count * sizeof(display_e2e_pipe_params_st), GFP_KERNEL);
+	struct mall_temp_config mall_temp_config;
 	DC_LOGGER_INIT(dc->ctx->logger);
 
+	/* For fast validation, there are situations where a shallow copy of
+	 * of the dc->current_state is created for the validation. In this case
+	 * we want to save and restore the mall config because we always
+	 * teardown subvp at the beginning of validation (and don't attempt
+	 * to add it back if it's fast validation). If we don't restore the
+	 * subvp config in cases of fast validation + shallow copy of the
+	 * dc->current_state, the dc->current_state will have a partially
+	 * removed subvp state when we did not intend to remove it.
+	 */
+	if (fast_validate) {
+		memset(&mall_temp_config, 0, sizeof(mall_temp_config));
+		dcn32_save_mall_state(dc, context, &mall_temp_config);
+	}
+
 	BW_VAL_TRACE_COUNT();
 
 	DC_FP_START();
 	out = dcn32_internal_validate_bw(dc, context, pipes, &pipe_cnt, &vlevel, fast_validate);
 	DC_FP_END();
 
+	if (fast_validate)
+		dcn32_restore_mall_state(dc, context, &mall_temp_config);
+
 	if (pipe_cnt == 0)
 		goto validate_out;
 

drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource.h

@@ -45,6 +45,17 @@
 extern struct _vcs_dpi_ip_params_st dcn3_2_ip;
 extern struct _vcs_dpi_soc_bounding_box_st dcn3_2_soc;
 
+/* Temp struct used to save and restore MALL config
+ * during validation.
+ *
+ * TODO: Move MALL config into dc_state instead of stream struct
+ * to avoid needing to save/restore.
+ */
+struct mall_temp_config {
+	struct mall_stream_config mall_stream_config[MAX_PIPES];
+	bool is_phantom_plane[MAX_PIPES];
+};
+
 struct dcn32_resource_pool {
 	struct resource_pool base;
 };
@@ -122,6 +133,15 @@ void dcn32_determine_det_override(struct dc *dc,
 
 void dcn32_set_det_allocations(struct dc *dc, struct dc_state *context,
 	display_e2e_pipe_params_st *pipes);
+
+void dcn32_save_mall_state(struct dc *dc,
+		struct dc_state *context,
+		struct mall_temp_config *temp_config);
+
+void dcn32_restore_mall_state(struct dc *dc,
+		struct dc_state *context,
+		struct mall_temp_config *temp_config);
+
 /* definitions for run time init of reg offsets */
 
 /* CLK SRC */

drivers/gpu/drm/amd/display/dc/dcn32/dcn32_resource_helpers.c

@@ -380,3 +380,74 @@ void dcn32_set_det_allocations(struct dc *dc, struct dc_state *context,
 	} else
 		dcn32_determine_det_override(dc, context, pipes);
 }
+
+/**
+ * *******************************************************************************************
+ * dcn32_save_mall_state: Save MALL (SubVP) state for fast validation cases
+ *
+ * This function saves the MALL (SubVP) case for fast validation cases. For fast validation,
+ * there are situations where a shallow copy of the dc->current_state is created for the
+ * validation. In this case we want to save and restore the mall config because we always
+ * teardown subvp at the beginning of validation (and don't attempt to add it back if it's
+ * fast validation). If we don't restore the subvp config in cases of fast validation +
+ * shallow copy of the dc->current_state, the dc->current_state will have a partially
+ * removed subvp state when we did not intend to remove it.
+ *
+ * NOTE: This function ONLY works if the streams are not moved to a different pipe in the
+ *       validation. We don't expect this to happen in fast_validation=1 cases.
+ *
+ * @param [in]: dc: Current DC state
+ * @param [in]: context: New DC state to be programmed
+ * @param [out]: temp_config: struct used to cache the existing MALL state
+ *
+ * @return: void
+ *
+ * *******************************************************************************************
+ */
+void dcn32_save_mall_state(struct dc *dc,
+		struct dc_state *context,
+		struct mall_temp_config *temp_config)
+{
+	uint32_t i;
+
+	for (i = 0; i < dc->res_pool->pipe_count; i++) {
+		struct pipe_ctx *pipe = &context->res_ctx.pipe_ctx[i];
+
+		if (pipe->stream)
+			temp_config->mall_stream_config[i] = pipe->stream->mall_stream_config;
+
+		if (pipe->plane_state)
+			temp_config->is_phantom_plane[i] = pipe->plane_state->is_phantom;
+	}
+}
+
+/**
+ * *******************************************************************************************
+ * dcn32_restore_mall_state: Restore MALL (SubVP) state for fast validation cases
+ *
+ * Restore the MALL state based on the previously saved state from dcn32_save_mall_state
+ *
+ * @param [in]: dc: Current DC state
+ * @param [in/out]: context: New DC state to be programmed, restore MALL state into here
+ * @param [in]: temp_config: struct that has the cached MALL state
+ *
+ * @return: void
+ *
+ * *******************************************************************************************
+ */
+void dcn32_restore_mall_state(struct dc *dc,
+		struct dc_state *context,
+		struct mall_temp_config *temp_config)
+{
+	uint32_t i;
+
+	for (i = 0; i < dc->res_pool->pipe_count; i++) {
+		struct pipe_ctx *pipe = &context->res_ctx.pipe_ctx[i];
+
+		if (pipe->stream)
+			pipe->stream->mall_stream_config = temp_config->mall_stream_config[i];
+
+		if (pipe->plane_state)
+			pipe->plane_state->is_phantom = temp_config->is_phantom_plane[i];
+	}
+}