SDHCI_CTRL2_MMC_HS400
hostctrl2 |= SDHCI_CTRL2_MMC_HS400;
old_timing != SDHCI_CTRL2_MMC_HS400 &&
if ((val & SDHCI_CTRL2_UHS_MASK) == SDHCI_CTRL2_MMC_HS400)
val &= ~SDHCI_CTRL2_MMC_HS400;