PORT_FBS_DEC
tmp &= ~(PORT_FBS_DEV_MASK | PORT_FBS_DEC);
writel(fbs | PORT_FBS_DEC, port_mmio + PORT_FBS);
while ((fbs & PORT_FBS_DEC) && retries--) {
if (fbs & PORT_FBS_DEC)
fbs &= ~(PORT_FBS_DEV_MASK | PORT_FBS_DEC);