AHCI_PREG_IS_DHRS
AHCI_PREG_IS_DHRS |
AHCI_PREG_IS_DHRS | AHCI_PREG_IS_SDBS);
} else if (is & AHCI_PREG_IS_DHRS) {
ahci_pwrite(ap, AHCI_PREG_IS, AHCI_PREG_IS_DHRS);