SDHCI_WAKE_UP_CONTROL
val = sdhci_readb(host, SDHCI_WAKE_UP_CONTROL);
sdhci_writeb(host, val, SDHCI_WAKE_UP_CONTROL);
val = sdhci_readb(host, SDHCI_WAKE_UP_CONTROL);
sdhci_writeb(host, val, SDHCI_WAKE_UP_CONTROL);
sdhci_readb(host, SDHCI_WAKE_UP_CONTROL),