drm/ast: Initialize planes in helper functions

This change will help with inlining cursor functions into modesetting
code. The primary plane's field used to be cleared with memset(). This
has been dropped as the memory is always allocated with kzalloc().
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210209134632.12157-4-tzimmermann@suse.de

drivers/gpu/drm/ast/ast_mode.c

@@ -621,6 +621,26 @@ static const struct drm_plane_funcs ast_primary_plane_funcs = {
 	.atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
 };
 
+static int ast_primary_plane_init(struct ast_private *ast)
+{
+	struct drm_device *dev = &ast->base;
+	struct drm_plane *primary_plane = &ast->primary_plane;
+	int ret;
+
+	ret = drm_universal_plane_init(dev, primary_plane, 0x01,
+				       &ast_primary_plane_funcs,
+				       ast_primary_plane_formats,
+				       ARRAY_SIZE(ast_primary_plane_formats),
+				       NULL, DRM_PLANE_TYPE_PRIMARY, NULL);
+	if (ret) {
+		drm_err(dev, "drm_universal_plane_init() failed: %d\n", ret);
+		return ret;
+	}
+	drm_plane_helper_add(primary_plane, &ast_primary_plane_helper_funcs);
+
+	return 0;
+}
+
 /*
  * Cursor plane
  */
@@ -725,6 +745,26 @@ static const struct drm_plane_funcs ast_cursor_plane_funcs = {
 	.atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
 };
 
+static int ast_cursor_plane_init(struct ast_private *ast)
+{
+	struct drm_device *dev = &ast->base;
+	struct drm_plane *cursor_plane = &ast->cursor_plane;
+	int ret;
+
+	ret = drm_universal_plane_init(dev, cursor_plane, 0x01,
+				       &ast_cursor_plane_funcs,
+				       ast_cursor_plane_formats,
+				       ARRAY_SIZE(ast_cursor_plane_formats),
+				       NULL, DRM_PLANE_TYPE_CURSOR, NULL);
+	if (ret) {
+		drm_err(dev, "drm_universal_plane_failed(): %d\n", ret);
+		return ret;
+	}
+	drm_plane_helper_add(cursor_plane, &ast_cursor_plane_helper_funcs);
+
+	return 0;
+}
+
 /*
  * CRTC
  */
@@ -1138,30 +1178,14 @@ int ast_mode_config_init(struct ast_private *ast)
 
 	dev->mode_config.helper_private = &ast_mode_config_helper_funcs;
 
-	memset(&ast->primary_plane, 0, sizeof(ast->primary_plane));
-	ret = drm_universal_plane_init(dev, &ast->primary_plane, 0x01,
-				       &ast_primary_plane_funcs,
-				       ast_primary_plane_formats,
-				       ARRAY_SIZE(ast_primary_plane_formats),
-				       NULL, DRM_PLANE_TYPE_PRIMARY, NULL);
-	if (ret) {
-		drm_err(dev, "ast: drm_universal_plane_init() failed: %d\n", ret);
+
+	ret = ast_primary_plane_init(ast);
+	if (ret)
 		return ret;
-	}
-	drm_plane_helper_add(&ast->primary_plane,
-			     &ast_primary_plane_helper_funcs);
 
-	ret = drm_universal_plane_init(dev, &ast->cursor_plane, 0x01,
-				       &ast_cursor_plane_funcs,
-				       ast_cursor_plane_formats,
-				       ARRAY_SIZE(ast_cursor_plane_formats),
-				       NULL, DRM_PLANE_TYPE_CURSOR, NULL);
-	if (ret) {
-		drm_err(dev, "drm_universal_plane_failed(): %d\n", ret);
+	ret = ast_cursor_plane_init(ast);
+	if (ret)
 		return ret;
-	}
-	drm_plane_helper_add(&ast->cursor_plane,
-			     &ast_cursor_plane_helper_funcs);
 
 	ast_crtc_init(dev);
 	ast_encoder_init(dev);