drm/qxl: add drm_gem_plane_helper_prepare_fb

We could need to wait for the pin to complete here.
Signed-off-by: Christian König <christian.koenig@amd.com>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: virtualization@lists.linux-foundation.org
Cc: spice-devel@lists.freedesktop.org
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20220429134230.24334-4-christian.koenig@amd.com

drivers/gpu/drm/qxl/qxl_display.c

@@ -34,6 +34,7 @@
 #include <drm/drm_plane_helper.h>
 #include <drm/drm_probe_helper.h>
 #include <drm/drm_simple_kms_helper.h>
+#include <drm/drm_gem_atomic_helper.h>
 
 #include "qxl_drv.h"
 #include "qxl_object.h"
@@ -829,6 +830,7 @@ static int qxl_plane_prepare_fb(struct drm_plane *plane,
 	struct qxl_device *qdev = to_qxl(plane->dev);
 	struct drm_gem_object *obj;
 	struct qxl_bo *user_bo;
+	int ret;
 
 	if (!new_state->fb)
 		return 0;
@@ -852,7 +854,11 @@ static int qxl_plane_prepare_fb(struct drm_plane *plane,
 		qxl_free_cursor(old_cursor_bo);
 	}
 
-	return qxl_bo_pin(user_bo);
+	ret = qxl_bo_pin(user_bo);
+	if (ret)
+		return ret;
+
+	return drm_gem_plane_helper_prepare_fb(plane, new_state);
 }
 
 static void qxl_plane_cleanup_fb(struct drm_plane *plane,