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Power management fixes for v4.6-rc5

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- Fix an intel_pstate driver problem causing CPUs to get stuck in
    the highest P-state when completely idle uncovered by the recent
    switch over from using timers (Rafael Wysocki).
 
  - Avoid attempts to get the current CPU frequency when all devices
    (like I2C controllers that may be nedded for that purpose) have
    been suspended during system suspend/resume (Rafael Wysocki).
 
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Merge tag 'pm+acpi-4.6-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull power management fixes from Rafael Wysocki:
 "Two fixes for issues introduced recently, one for an intel_pstate
  driver problem uncovered by the recent switch over from using timers
  and the other one for a potential cpufreq core problem related to
  system suspend/resume.

  Specifics:

   - Fix an intel_pstate driver problem causing CPUs to get stuck in the
     highest P-state when completely idle uncovered by the recent switch
     over from using timers (Rafael Wysocki).

   - Avoid attempts to get the current CPU frequency when all devices
     (like I2C controllers that may be nedded for that purpose) have
     been suspended during system suspend/resume (Rafael Wysocki)"

* tag 'pm+acpi-4.6-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  cpufreq: Abort cpufreq_update_current_freq() for cpufreq_suspended set
  intel_pstate: Avoid getting stuck in high P-states when idle
This commit is contained in:
Linus Torvalds 2016-04-21 14:29:34 -07:00
commit f78fe0817a
2 changed files with 7 additions and 0 deletions
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3
drivers/cpufreq/cpufreq.c
View File

@ -1491,6 +1491,9 @@ static unsigned int cpufreq_update_current_freq(struct cpufreq_policy *policy)
{
unsigned int new_freq;
if (cpufreq_suspended)
return 0;
new_freq = cpufreq_driver->get(policy->cpu);
if (!new_freq)
return 0;

4
drivers/cpufreq/intel_pstate.c
View File

@ -1130,6 +1130,10 @@ static inline int32_t get_target_pstate_use_performance(struct cpudata *cpu)
sample_ratio = div_fp(int_tofp(pid_params.sample_rate_ns),
int_tofp(duration_ns));
core_busy = mul_fp(core_busy, sample_ratio);
} else {
sample_ratio = div_fp(100 * cpu->sample.mperf, cpu->sample.tsc);
if (sample_ratio < int_tofp(1))
core_busy = 0;
}
cpu->sample.busy_scaled = core_busy;