RTSX_CARD_PWR_CTL
RTSX_SET(sc, RTSX_CARD_PWR_CTL, RTSX_SD_PWR_OFF);
RTSX_CLR(sc, RTSX_CARD_PWR_CTL, RTSX_PMOS_STRG_800mA);
RTSX_SET(sc, RTSX_CARD_PWR_CTL, RTSX_SD_PARTIAL_PWR_ON);
RTSX_CLR(sc, RTSX_CARD_PWR_CTL, RTSX_SD_PWR_OFF);