PORT_CHANGE_PRSC
uhcip->uhci_root_hub.rh_port_changes[port] &= ~PORT_CHANGE_PRSC;
cs |= PORT_CHANGE_PRSC;
if (change & PORT_CHANGE_PRSC) {
if (*change & PORT_CHANGE_PRSC) {
hubd->h_port_state[port] |= (PORT_CHANGE_PRSC & ack_flag);
hubd->h_port_state[port] &= ~(PORT_CHANGE_PRSC & ack_flag);
if (*change & PORT_CHANGE_PRSC & ack_flag) {