drm_sysfb_plane_helper_atomic_check
int drm_sysfb_plane_helper_atomic_check(struct drm_plane *plane,
.atomic_check = drm_sysfb_plane_helper_atomic_check, \
EXPORT_SYMBOL(drm_sysfb_plane_helper_atomic_check);
ret = drm_sysfb_plane_helper_atomic_check(plane, new_state);