SDXC_MASK_DATA0
rval &= ~(SDXC_CARD_CLOCK_ON | SDXC_LOW_POWER_ON | SDXC_MASK_DATA0);
rval |= SDXC_MASK_DATA0;
mmc_writel(host, REG_CLKCR, rval & ~SDXC_MASK_DATA0);