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Add a sysfs node to allow root user to set PRI_FE_GFXP_WFI_TIMEOUT, for gp10b only, in units of sysclk cycles. Store the set value in a variable, and write the set value to register after GPU is un-railgated. NV_PGRAPH_PRI_FE_GFXP_WFI_TIMEOUT is engine_reset after Bug 1623341. Change default value to be specified in cycles, rather than time. This value is almost the current value in cycles calculated each boot. Bug 1932782 Change-Id: I0a4207e637cd1413a1be95abe2bcce3adccf76fa Reviewed-on: https://git-master.nvidia.com/r/1540939 Signed-off-by: Jonathan McCaffrey <jmccaffrey@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/1580999 Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com> Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>