From: Hoan Tran <hotran@apm.com>
To: "Rafael J. Wysocki" <rjw@rjwysocki.net>,
Viresh Kumar <viresh.kumar@linaro.org>,
pprakash@codeaurora.org, Al Stone <ahs3@redhat.com>
Cc: linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org,
lho@apm.com, Duc Dang <dhdang@apm.com>,
Hoan Tran <hotran@apm.com>
Subject: [PATCH] cpufreq: CPPC: Correct desired_perf calculation
Date: Tue, 11 Oct 2016 14:12:00 -0700 [thread overview]
Message-ID: <1476220320-19685-1-git-send-email-hotran@apm.com> (raw)
The desired_perf is an abstract performance number. Its value should
be in the range of [lowest perf, highest perf] of CPPC.
The correct calculation is
desired_perf = freq * cppc_highest_perf / cppc_dmi_max_khz
Signed-off-by: Hoan Tran <hotran@apm.com>
---
drivers/cpufreq/cppc_cpufreq.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/cpufreq/cppc_cpufreq.c b/drivers/cpufreq/cppc_cpufreq.c
index 1b2f28f..ab1d4b7 100644
--- a/drivers/cpufreq/cppc_cpufreq.c
+++ b/drivers/cpufreq/cppc_cpufreq.c
@@ -84,7 +84,7 @@ static int cppc_cpufreq_set_target(struct cpufreq_policy *policy,
cpu = all_cpu_data[policy->cpu];
- cpu->perf_ctrls.desired_perf = (u64)target_freq * policy->max / cppc_dmi_max_khz;
+ cpu->perf_ctrls.desired_perf = (u64)target_freq * cpu->perf_caps.highest_perf / cppc_dmi_max_khz;
freqs.old = policy->cur;
freqs.new = target_freq;
--
1.9.1
next reply other threads:[~2016-10-11 21:21 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-11 21:12 Hoan Tran [this message]
2016-10-11 21:50 ` [PATCH] cpufreq: CPPC: Correct desired_perf calculation Rafael J. Wysocki
2016-10-11 22:31 ` Hoan Tran
2016-10-12 3:21 ` Viresh Kumar
2016-10-12 15:36 ` Prakash, Prashanth
2016-10-12 17:33 ` Hoan Tran
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