RTSX_HDBCTLR
sc->sc_regs4[3] = READ4(sc, RTSX_HDBCTLR);
WRITE4(sc, RTSX_HDBCTLR, sc->sc_regs4[3]);
WRITE4(sc, RTSX_HDBCTLR, RTSX_TRIG_DMA | (read ? RTSX_DMA_READ : 0) |
WRITE4(sc, RTSX_HDBCTLR, RTSX_STOP_DMA);