AHCI_PREG_SCTL
ahci_pwrite(ap, AHCI_PREG_SCTL, r);
ahci_pwrite(ap, AHCI_PREG_SCTL, r);
ahci_pwrite(ap, AHCI_PREG_SCTL, r);
ahci_pwrite(ap, AHCI_PREG_SCTL, r);
ahci_pwrite(ap, AHCI_PREG_SCTL, r);
ahci_pwrite(ap, AHCI_PREG_SCTL, ap->ap_sc->sc_ipm_disable);
(ahci_pread(ap, AHCI_PREG_SCTL) & AHCI_PREG_SCTL_DET)) {
ahci_pwrite(ap, AHCI_PREG_SCTL, ap->ap_sc->sc_ipm_disable);
ahci_pwrite(ap, AHCI_PREG_SCTL, ap->ap_sc->sc_ipm_disable);
sctl = ahci_pread(ap, AHCI_PREG_SCTL);
ahci_pwrite(ap, AHCI_PREG_SCTL, sctl);
sctl = ahci_pread(ap, AHCI_PREG_SCTL);
ahci_pwrite(ap, AHCI_PREG_SCTL, sctl);
sctl = ahci_pread(ap, AHCI_PREG_SCTL);
ahci_pwrite(ap, AHCI_PREG_SCTL, sctl);