drm/rockchip: Use drm_gem_fb_create_with_dirty

If rockchip would switch over to the generic fbdev setup we could
grabage collect even more of all this code (all of the remaining fb
handling code really).

v2: Actually use _with_dirty like the patch subject promised (Andrzej)

Cc: Andrzej Pietrasiewicz <[e-mail]>
Reviewed-by: Andrzej Pietrasiewicz <[e-mail]>
Signed-off-by: Daniel Vetter <[e-mail]>
Cc: Sandy Huang <[e-mail]>
Cc: "Heiko Stübner" <[e-mail]>
Cc: [e-mail]
Cc: [e-mail]
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/rockchip/rockchip_drm_fb.c

···
 	return fb;
 }
 
-static struct drm_framebuffer *
-rockchip_user_fb_create(struct drm_device *dev, struct drm_file *file_priv,
-			const struct drm_mode_fb_cmd2 *mode_cmd)
-{
-	const struct drm_format_info *info = drm_get_format_info(dev,
-								 mode_cmd);
-	struct drm_framebuffer *fb;
-	struct drm_gem_object *objs[ROCKCHIP_MAX_FB_BUFFER];
-	struct drm_gem_object *obj;
-	int num_planes = min_t(int, info->num_planes, ROCKCHIP_MAX_FB_BUFFER);
-	int ret;
-	int i;
-
-	for (i = 0; i < num_planes; i++) {
-		unsigned int width = mode_cmd->width / (i ? info->hsub : 1);
-		unsigned int height = mode_cmd->height / (i ? info->vsub : 1);
-		unsigned int min_size;
-
-		obj = drm_gem_object_lookup(file_priv, mode_cmd->handles[i]);
-		if (!obj) {
-			DRM_DEV_ERROR(dev->dev,
-				      "Failed to lookup GEM object\n");
-			ret = -ENXIO;
-			goto err_gem_object_unreference;
-		}
-
-		min_size = (height - 1) * mode_cmd->pitches[i] +
-			mode_cmd->offsets[i] +
-			width * info->cpp[i];
-
-		if (obj->size < min_size) {
-			drm_gem_object_put_unlocked(obj);
-			ret = -EINVAL;
-			goto err_gem_object_unreference;
-		}
-		objs[i] = obj;
-	}
-
-	fb = rockchip_fb_alloc(dev, mode_cmd, objs, i);
-	if (IS_ERR(fb)) {
-		ret = PTR_ERR(fb);
-		goto err_gem_object_unreference;
-	}
-
-	return fb;
-
-err_gem_object_unreference:
-	for (i--; i >= 0; i--)
-		drm_gem_object_put_unlocked(objs[i]);
-	return ERR_PTR(ret);
-}
-
 static const struct drm_mode_config_helper_funcs rockchip_mode_config_helpers = {
 	.atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,
 };
 
 static const struct drm_mode_config_funcs rockchip_drm_mode_config_funcs = {
-	.fb_create = rockchip_user_fb_create,
+	.fb_create = drm_gem_fb_create_with_dirty,
 	.output_poll_changed = drm_fb_helper_output_poll_changed,
 	.atomic_check = drm_atomic_helper_check,
 	.atomic_commit = drm_atomic_helper_commit,