drm/plane-helper: unexport drm_primary_helper_create_plane

We shouldn't tempt driver writers into using this since it uses a
default format list which is likely wrong. And when that's done we can
simplify the code a bit, too.

Noticed while reviewing a patch from Laurent.

Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>

drivers/gpu/drm/drm_plane_helper.c

@@ -344,20 +344,7 @@ const struct drm_plane_funcs drm_primary_helper_funcs = {
 };
 EXPORT_SYMBOL(drm_primary_helper_funcs);
 
-/**
- * drm_primary_helper_create_plane() - Create a generic primary plane
- * @dev: drm device
- * @formats: pixel formats supported, or NULL for a default safe list
- * @num_formats: size of @formats; ignored if @formats is NULL
- *
- * Allocates and initializes a primary plane that can be used with the primary
- * plane helpers.  Drivers that wish to use driver-specific plane structures or
- * provide custom handler functions may perform their own allocation and
- * initialization rather than calling this function.
- */
-struct drm_plane *drm_primary_helper_create_plane(struct drm_device *dev,
-						  const uint32_t *formats,
-						  int num_formats)
+static struct drm_plane *create_primary_plane(struct drm_device *dev)
 {
 	struct drm_plane *primary;
 	int ret;
@@ -368,15 +355,11 @@ struct drm_plane *drm_primary_helper_create_plane(struct drm_device *dev,
 		return NULL;
 	}
 
-	if (formats == NULL) {
-		formats = safe_modeset_formats;
-		num_formats = ARRAY_SIZE(safe_modeset_formats);
-	}
-
 	/* possible_crtc's will be filled in later by crtc_init */
 	ret = drm_universal_plane_init(dev, primary, 0,
 				       &drm_primary_helper_funcs,
-				       formats, num_formats,
+				       safe_modeset_formats,
+				       ARRAY_SIZE(safe_modeset_formats),
 				       DRM_PLANE_TYPE_PRIMARY);
 	if (ret) {
 		kfree(primary);
@@ -385,7 +368,6 @@ struct drm_plane *drm_primary_helper_create_plane(struct drm_device *dev,
 
 	return primary;
 }
-EXPORT_SYMBOL(drm_primary_helper_create_plane);
 
 /**
  * drm_crtc_init - Legacy CRTC initialization function
@@ -404,7 +386,7 @@ int drm_crtc_init(struct drm_device *dev, struct drm_crtc *crtc,
 {
 	struct drm_plane *primary;
 
-	primary = drm_primary_helper_create_plane(dev, NULL, 0);
+	primary = create_primary_plane(dev);
 	return drm_crtc_init_with_planes(dev, crtc, primary, NULL, funcs);
 }
 EXPORT_SYMBOL(drm_crtc_init);

include/drm/drm_plane_helper.h

@@ -100,10 +100,6 @@ extern int drm_primary_helper_update(struct drm_plane *plane,
 extern int drm_primary_helper_disable(struct drm_plane *plane);
 extern void drm_primary_helper_destroy(struct drm_plane *plane);
 extern const struct drm_plane_funcs drm_primary_helper_funcs;
-extern struct drm_plane *drm_primary_helper_create_plane(struct drm_device *dev,
-							 const uint32_t *formats,
-							 int num_formats);
-
 
 int drm_plane_helper_update(struct drm_plane *plane, struct drm_crtc *crtc,
 			    struct drm_framebuffer *fb,