cpufreq: intel_pstate: Set HWP sampling interval once

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>

diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index 5585a2d..b631ab0 100644 (file)
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -1911,8 +1911,6 @@ static int intel_pstate_init_cpu(unsigned int cpunum)
                        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);
@@ -2563,6 +2561,7 @@ static int __init intel_pstate_init(void)
                } else {
                        hwp_active++;
                        intel_pstate.attr = hwp_cpufreq_attrs;
+                       pid_params.sample_rate_ns = 50 * NSEC_PER_MSEC;
                        goto hwp_cpu_matched;
                }
        } else {