SDHCI_VNDR_TUN_CTRL0_0
val = sdhci_readl(host, SDHCI_VNDR_TUN_CTRL0_0);
sdhci_writel(host, val, SDHCI_VNDR_TUN_CTRL0_0);
val = sdhci_readl(host, SDHCI_VNDR_TUN_CTRL0_0);
sdhci_writel(host, val, SDHCI_VNDR_TUN_CTRL0_0);