NvRegMIIControl
reg = readl(base + NvRegMIIControl);
writel(NVREG_MIICTL_INUSE, base + NvRegMIIControl);
writel(reg, base + NvRegMIIControl);
if (reg_delay(dev, NvRegMIIControl, NVREG_MIICTL_INUSE, 0,