[06/16] cpufreq: intel_pstate: Set HWP sampling interval once

Commit Message

Rafael J. Wysocki March 27, 2017, 10:10 p.m. UTC

From: Rafael J. Wysocki <[e-mail]>

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 <[e-mail]>
---
 drivers/cpufreq/intel_pstate.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

Patch

Index: linux-pm/drivers/cpufreq/intel_pstate.c
===================================================================
--- linux-pm.orig/drivers/cpufreq/intel_pstate.c
+++ linux-pm/drivers/cpufreq/intel_pstate.c
@@ -1911,8 +1911,6 @@  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);
@@ -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 {