MVS_WORKRP_SIZE
NULL, NULL, MVS_WORKRP_SIZE, 1, MVS_WORKRP_SIZE,
ch->dma.workrp, MVS_WORKRP_SIZE, mvs_dmasetupc_cb, &dcba, 0) ||
memset(ch->dma.workrp, 0xff, MVS_WORKRP_SIZE);