MMC_TIMING_SD_EXP_1_2V
host->ios.timing == MMC_TIMING_SD_EXP_1_2V;
host->ios.timing = MMC_TIMING_SD_EXP_1_2V;
mmc->ios.timing &= ~(MMC_TIMING_SD_EXP | MMC_TIMING_SD_EXP_1_2V);
mmc->ios.timing &= ~(MMC_TIMING_SD_EXP | MMC_TIMING_SD_EXP_1_2V);
if (host->mmc->ios.timing == MMC_TIMING_SD_EXP_1_2V &&