drm/amd/display: Refactor dc_state creation into a function.

For less repetition and easy debugging.
Signed-off-by: Leo (Sunpeng) Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -702,13 +702,11 @@ dm_atomic_state_alloc(struct drm_device *dev)
 		goto fail;
 
 	/* copy existing configuration */
-	new_ctx = dm_alloc(sizeof(*new_ctx));
+	new_ctx = dc_create_state();
 
 	if (!new_ctx)
 		goto fail;
 
-	atomic_inc(&new_ctx->ref_count);
-
 	dc_resource_validate_ctx_copy_construct_current(dc, new_ctx);
 
 	state->context = new_ctx;

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

@@ -497,15 +497,13 @@ static bool construct(struct dc *dc,
 		goto fail;
 	}
 
-	dc->current_context = dm_alloc(sizeof(*dc->current_context));
+	dc->current_context = dc_create_state();
 
 	if (!dc->current_context) {
 		dm_error("%s: failed to create validate ctx\n", __func__);
 		goto fail;
 	}
 
-	atomic_inc(&dc->current_context->ref_count);
-
 	dc_ctx->cgs_device = init_params->cgs_device;
 	dc_ctx->driver_context = init_params->driver;
 	dc_ctx->dc = dc;
@@ -1162,6 +1160,17 @@ bool dc_commit_planes_to_stream(
 	return true;
 }
 
+struct validate_context *dc_create_state(void)
+{
+	struct validate_context *context = dm_alloc(sizeof(struct validate_context));
+
+	if (!context)
+		return NULL;
+
+	atomic_inc(&context->ref_count);
+	return context;
+}
+
 void dc_retain_validate_context(struct validate_context *context)
 {
 	ASSERT(atomic_read(&context->ref_count) > 0);
@@ -1442,12 +1451,10 @@ void dc_update_planes_and_stream(struct dc *dc,
 			new_planes[i] = srf_updates[i].surface;
 
 		/* initialize scratch memory for building context */
-		context = dm_alloc(sizeof(*context));
+		context = dc_create_state();
 		if (context == NULL)
 				goto context_alloc_fail;
 
-		atomic_inc(&context->ref_count);
-
 		dc_resource_validate_ctx_copy_construct(
 				core_dc->current_context, context);
 

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

@@ -732,6 +732,7 @@ enum surface_update_type dc_check_update_surfaces_for_stream(
 		const struct dc_stream_status *stream_status);
 
 
+struct validate_context *dc_create_state(void);
 void dc_retain_validate_context(struct validate_context *context);
 void dc_release_validate_context(struct validate_context *context);