NvRegPowerState2
powerstate = readl(base + NvRegPowerState2);
writel(powerstate, base + NvRegPowerState2);
u32 powerstate = readl(base + NvRegPowerState2);
writel(powerstate, base + NvRegPowerState2);
writel(powerstate, base + NvRegPowerState2);
powerstate = readl(base + NvRegPowerState2);
writel(powerstate, base + NvRegPowerState2);