AHCI_P_CMD_SUD
val |= AHCI_P_CMD_SUD;
val &= ~AHCI_P_CMD_SUD;
(AHCI_P_CMD_ACTIVE | AHCI_P_CMD_POD | AHCI_P_CMD_SUD |
p->cmd &= ~(AHCI_P_CMD_ST | AHCI_P_CMD_SUD | AHCI_P_CMD_POD |
p->cmd |= (AHCI_P_CMD_ST | AHCI_P_CMD_SUD | AHCI_P_CMD_POD |
sc->port[i].cmd = (AHCI_P_CMD_SUD | AHCI_P_CMD_POD);