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cpufreq: intel_pstate: Reduce impact due to rounding error

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When policy->max and policy->min are same, in some cases they don't
result in the same frequency cap. The max_policy_pct is rounded up but
not min_perf_pct. So even when they are same, results in different
percentage or maximum and minimum.
Since minimum is a conservative value for power, a lower value without
rounding is better in most of the cases, unless user wants
policy->max = policy->min.
This change uses use the same policy percentage when policy->max and
policy->min are same.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Srinivas Pandruvada 2016-10-25 13:20:41 -07:00 committed by Rafael J. Wysocki
parent eae48f046f
commit 5879f87739
1 changed files with 8 additions and 2 deletions
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10
drivers/cpufreq/intel_pstate.c
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@ -1543,11 +1543,17 @@ static void intel_pstate_set_performance_limits(struct perf_limits *limits)
static void intel_pstate_update_perf_limits(struct cpufreq_policy *policy,
struct perf_limits *limits)
{
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->max_policy_pct = DIV_ROUND_UP(policy->max * 100,
policy->cpuinfo.max_freq);
limits->max_policy_pct = clamp_t(int, limits->max_policy_pct, 0, 100);
if (policy->max == policy->min) {
limits->min_policy_pct = limits->max_policy_pct;
} else {
limits->min_policy_pct = (policy->min * 100) /
policy->cpuinfo.max_freq;
limits->min_policy_pct = clamp_t(int, limits->min_policy_pct,
0, 100);
}
/* Normalize user input to [min_policy_pct, max_policy_pct] */
limits->min_perf_pct = max(limits->min_policy_pct,