drm_dp_find_vcpi_slots
slots = drm_dp_find_vcpi_slots(mst_mgr, pbn);
EXPORT_SYMBOL(drm_dp_find_vcpi_slots);
int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr,
slots = drm_dp_find_vcpi_slots(&radeon_connector->mst_port->mst_mgr,