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Subject[PATCH 06/14] cpufreq: intel_pstate: Set HWP sampling interval once
Date
From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

In the HWP enabled case pid_params.sample_rate_ns only needs to be
updated once, because it is global, so do that when setting hwp_active
instead of doing it during the initialization of every CPU.

Moreover, pid_params.sample_rate_ms is never used if HWP is enabled,
so do not update it at all then.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
drivers/cpufreq/intel_pstate.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

Index: linux-pm/drivers/cpufreq/intel_pstate.c
===================================================================
--- linux-pm.orig/drivers/cpufreq/intel_pstate.c
+++ linux-pm/drivers/cpufreq/intel_pstate.c
@@ -1974,8 +1974,6 @@ static int intel_pstate_init_cpu(unsigne
intel_pstate_disable_ee(cpunum);

intel_pstate_hwp_enable(cpu);
- pid_params.sample_rate_ms = 50;
- pid_params.sample_rate_ns = 50 * NSEC_PER_MSEC;
}

intel_pstate_get_cpu_pstates(cpu);
@@ -2650,6 +2648,7 @@ static int __init intel_pstate_init(void
copy_cpu_funcs(&core_params.funcs);
hwp_active++;
intel_pstate.attr = hwp_cpufreq_attrs;
+ pid_params.sample_rate_ns = 50 * NSEC_PER_MSEC;
goto hwp_cpu_matched;
}

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