SDHCI_UHS2_TIMER_CTRL
sdhci_writeb(host, 0xA7, SDHCI_UHS2_TIMER_CTRL);
sdhci_writeb(host, cmd_res, SDHCI_UHS2_TIMER_CTRL);
sdhci_writeb(host, cmd_res, SDHCI_UHS2_TIMER_CTRL);
sdhci_readw(host, SDHCI_UHS2_TIMER_CTRL));