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For POR like safety GPU, we may specify devfreq timer and governor to keep GPU running with high performance. This change supports module parameters for specifying devfreq governor and devfreq timer. safety nvgpu module parameter example: devfreq_timer="delayed" devfreq_gov="performance" Regarding devfreq timers, a delayed timer can ensure that the devfreq monitor polls on time. However, a deferrable timer might potentially cause a delay in polling time. Regarding devfreq governors, the default governor of nvgpu is nvhost_podgov, which scales the gpu frequency based on GPU load reported by PMU. Using the performance governor will keep the GPU operating at a higher GPU frequency, providing better performance. Bug 4084478 Change-Id: I9dfef11648203c6af281e980d3a5790b36742414 Signed-off-by: shaochunk <shaochunk@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2978810 Reviewed-by: Divya Singhatwaria <dsinghatwari@nvidia.com> Reviewed-by: Vijayakumar Subbu <vsubbu@nvidia.com> GVS: Gerrit_Virtual_Submit <buildbot_gerritrpt@nvidia.com>