XENON_SYS_CFG_INFO
reg = sdhci_readl(host, XENON_SYS_CFG_INFO);
sdhci_writel(host, reg, XENON_SYS_CFG_INFO);
reg = sdhci_readl(host, XENON_SYS_CFG_INFO);
sdhci_writel(host, reg, XENON_SYS_CFG_INFO);
nr_sdhc = sdhci_readl(host, XENON_SYS_CFG_INFO);