drm/vc4: plane: Switch to drmm_universal_plane_alloc()

Let's switch to drmm_universal_plane_alloc() for our plane allocation and
initialisation to make the driver a bit simpler.
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20220711173939.1132294-20-maxime@cerno.tech

drivers/gpu/drm/vc4/vc4_crtc.c

@@ -1282,7 +1282,6 @@ static int vc4_crtc_bind(struct device *dev, struct device *master, void *data)
 	const struct vc4_pv_data *pv_data;
 	struct vc4_crtc *vc4_crtc;
 	struct drm_crtc *crtc;
-	struct drm_plane *destroy_plane, *temp;
 	int ret;
 
 	vc4_crtc = devm_kzalloc(dev, sizeof(*vc4_crtc), GFP_KERNEL);

drivers/gpu/drm/vc4/vc4_plane.c

@@ -1483,8 +1483,6 @@ static bool vc4_format_mod_supported(struct drm_plane *plane,
 static const struct drm_plane_funcs vc4_plane_funcs = {
 	.update_plane = drm_atomic_helper_update_plane,
 	.disable_plane = drm_atomic_helper_disable_plane,
-	.destroy = drm_plane_cleanup,
-	.set_property = NULL,
 	.reset = vc4_plane_reset,
 	.atomic_duplicate_state = vc4_plane_duplicate_state,
 	.atomic_destroy_state = vc4_plane_destroy_state,
@@ -1496,11 +1494,10 @@ struct drm_plane *vc4_plane_init(struct drm_device *dev,
 				 uint32_t possible_crtcs)
 {
 	struct vc4_dev *vc4 = to_vc4_dev(dev);
-	struct drm_plane *plane = NULL;
+	struct drm_plane *plane;
 	struct vc4_plane *vc4_plane;
 	u32 formats[ARRAY_SIZE(hvs_formats)];
 	int num_formats = 0;
-	int ret = 0;
 	unsigned i;
 	static const uint64_t modifiers[] = {
 		DRM_FORMAT_MOD_BROADCOM_VC4_T_TILED,
@@ -1511,11 +1508,6 @@ struct drm_plane *vc4_plane_init(struct drm_device *dev,
 		DRM_FORMAT_MOD_INVALID
 	};
 
-	vc4_plane = devm_kzalloc(dev->dev, sizeof(*vc4_plane),
-				 GFP_KERNEL);
-	if (!vc4_plane)
-		return ERR_PTR(-ENOMEM);
-
 	for (i = 0; i < ARRAY_SIZE(hvs_formats); i++) {
 		if (!hvs_formats[i].hvs5_only || vc4->is_vc5) {
 			formats[num_formats] = hvs_formats[i].drm;
@@ -1523,13 +1515,14 @@ struct drm_plane *vc4_plane_init(struct drm_device *dev,
 		}
 	}
 
+	vc4_plane = drmm_universal_plane_alloc(dev, struct vc4_plane, base,
+					       possible_crtcs,
+					       &vc4_plane_funcs,
+					       formats, num_formats,
+					       modifiers, type, NULL);
+	if (IS_ERR(vc4_plane))
+		return ERR_CAST(vc4_plane);
 	plane = &vc4_plane->base;
-	ret = drm_universal_plane_init(dev, plane, possible_crtcs,
-				       &vc4_plane_funcs,
-				       formats, num_formats,
-				       modifiers, type, NULL);
-	if (ret)
-		return ERR_PTR(ret);
 
 	if (vc4->is_vc5)
 		drm_plane_helper_add(plane, &vc5_plane_helper_funcs);