NvRegPollingInterval
save_poll_interval = readl(base+NvRegPollingInterval);
writel(NVREG_POLL_DEFAULT_CPU, base + NvRegPollingInterval);
writel(save_poll_interval, base + NvRegPollingInterval);
writel(NVREG_POLL_DEFAULT_THROUGHPUT, base + NvRegPollingInterval);
writel(NVREG_POLL_DEFAULT_CPU, base + NvRegPollingInterval);
writel(poll_interval & 0xFFFF, base + NvRegPollingInterval);