RTSX_PHY_BUSY
RTSX_WRITE(sc, RTSX_PHY_RWCTL, RTSX_PHY_BUSY | RTSX_PHY_READ);
if (!(rwctl & RTSX_PHY_BUSY))
RTSX_WRITE(sc, RTSX_PHY_RWCTL, RTSX_PHY_BUSY | RTSX_PHY_WRITE);