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intel_pstate: honor user space min_perf_pct override on resume 

If the user has requested an override of the min_perf_pct via
sysfs, then it should be restored whenever policy is updated,
such as on resume.  Take the max of whatever the user requested
and whatever the policy is.

Signed-off-by: Kristen Carlson Accardi <kristen@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Kristen Carlson Accardi 2015-01-29 13:03:52 -08:00 committed by Rafael J. Wysocki
parent 630ec286dd
commit a04759924e
1 changed files with 11 additions and 3 deletions
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14
drivers/cpufreq/intel_pstate.c
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@ -148,6 +148,8 @@ struct perf_limits {
int32_t min_perf;
int max_policy_pct;
int max_sysfs_pct;
int min_policy_pct;
int min_sysfs_pct;
};
static struct perf_limits limits = {
@ -159,6 +161,8 @@ static struct perf_limits limits = {
.min_perf = 0,
.max_policy_pct = 100,
.max_sysfs_pct = 100,
.min_policy_pct = 0,
.min_sysfs_pct = 0,
};
static inline void pid_reset(struct _pid *pid, int setpoint, int busy,
@ -431,7 +435,9 @@ static ssize_t store_min_perf_pct(struct kobject *a, struct attribute *b,
ret = sscanf(buf, "%u", &input);
if (ret != 1)
return -EINVAL;
limits.min_perf_pct = clamp_t(int, input, 0 , 100);
limits.min_sysfs_pct = clamp_t(int, input, 0 , 100);
limits.min_perf_pct = max(limits.min_policy_pct, limits.min_sysfs_pct);
limits.min_perf = div_fp(int_tofp(limits.min_perf_pct), int_tofp(100));
if (hwp_active)
@ -921,6 +927,7 @@ static int intel_pstate_set_policy(struct cpufreq_policy *policy)
if (policy->policy == CPUFREQ_POLICY_PERFORMANCE &&
policy->max >= policy->cpuinfo.max_freq) {
limits.min_policy_pct = 100;
limits.min_perf_pct = 100;
limits.min_perf = int_tofp(1);
limits.max_policy_pct = 100;
@ -930,8 +937,9 @@ static int intel_pstate_set_policy(struct cpufreq_policy *policy)
return 0;
}
limits.min_perf_pct = (policy->min * 100) / policy->cpuinfo.max_freq;
limits.min_perf_pct = clamp_t(int, limits.min_perf_pct, 0 , 100);
limits.min_policy_pct = (policy->min * 100) / policy->cpuinfo.max_freq;
limits.min_policy_pct = clamp_t(int, limits.min_policy_pct, 0 , 100);
limits.min_perf_pct = max(limits.min_policy_pct, limits.min_sysfs_pct);
limits.min_perf = div_fp(int_tofp(limits.min_perf_pct), int_tofp(100));
limits.max_policy_pct = (policy->max * 100) / policy->cpuinfo.max_freq;