drm/amd/display: skip commit minimal transition state

[WHY]
Now dynamic ODM will now be disabled when MPO is required safe
transitions to avoid underflow, but we are triggering the way of minimal
transition too often. Commit state of dc with no check will do pipeline
setup which may re-initialize the component with no need such as audio.

[HOW]
Just do the minimal transition when all of pipes are in use, otherwise
return true to skip.

Tested-by: Mark Broadworth <[e-mail]>
Reviewed-by: Dillon Varone <[e-mail]>
Acked-by: Rodrigo Siqueira <[e-mail]>
Signed-off-by: zhikzhai <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

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

···
 	bool temp_subvp_policy;
 	enum dc_status ret = DC_ERROR_UNEXPECTED;
 	unsigned int i, j;
+	unsigned int pipe_in_use = 0;
 
 	if (!transition_context)
 		return false;
+
+	/* check current pipes in use*/
+	for (i = 0; i < dc->res_pool->pipe_count; i++) {
+		struct pipe_ctx *pipe = &transition_base_context->res_ctx.pipe_ctx[i];
+
+		if (pipe->plane_state)
+			pipe_in_use++;
+	}
+
+	/* When the OS add a new surface if we have been used all of pipes with odm combine
+	 * and mpc split feature, it need use commit_minimal_transition_state to transition safely.
+	 * After OS exit MPO, it will back to use odm and mpc split with all of pipes, we need
+	 * call it again. Otherwise return true to skip.
+	 *
+	 * Reduce the scenarios to use dc_commit_state_no_check in the stage of flip. Especially
+	 * enter/exit MPO when DCN still have enough resources.
+	 */
+	if (pipe_in_use != dc->res_pool->pipe_count) {
+		dc_release_state(transition_context);
+		return true;
+	}
 
 	if (!dc->config.is_vmin_only_asic) {
 		tmp_mpc_policy = dc->debug.pipe_split_policy;