XENON_SLOT_EMMC_CTRL
reg = sdhci_readl(host, XENON_SLOT_EMMC_CTRL);
sdhci_writel(host, reg, XENON_SLOT_EMMC_CTRL);
reg = sdhci_readl(host, XENON_SLOT_EMMC_CTRL);
sdhci_writel(host, reg, XENON_SLOT_EMMC_CTRL);