drm_dp_add_payload_part1
drm_dp_add_payload_part1(mst_mgr, mst_state, new_payload);
EXPORT_SYMBOL(drm_dp_add_payload_part1);
ret = drm_dp_add_payload_part1(&intel_dp->mst.mgr, mst_state,
int drm_dp_add_payload_part1(struct drm_dp_mst_topology_mgr *mgr,