Messages in this thread | | | Date | Wed, 9 Jan 2019 16:29:35 +0530 | From | Viresh Kumar <> | Subject | Re: [PATCH] cpufreq: scmi: Fix frequency invariance in slow path |
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On 09-01-19, 11:56, Rafael J. Wysocki wrote: > On Wednesday, January 9, 2019 11:45:11 AM CET Viresh Kumar wrote: > > On 09-01-19, 10:42, Quentin Perret wrote: > > > The scmi-cpufreq driver calls the arch_set_freq_scale() callback on > > > frequency changes to provide scale-invariant load-tracking signals to > > > the scheduler. However, in the slow path, it does so while specifying > > > the current and max frequencies in different units, hence resulting in a > > > broken freq_scale factor. > > > > > > Fix this by passing all frequencies in KHz, as stored in the CPUFreq > > > frequency table. > > > > > > Fixes: 99d6bdf33877 ("cpufreq: add support for CPU DVFS based on SCMI > > > message protocol") > > > Signed-off-by: Quentin Perret <quentin.perret@arm.com> > > > --- > > > drivers/cpufreq/scmi-cpufreq.c | 4 ++-- > > > 1 file changed, 2 insertions(+), 2 deletions(-) > > > > > > diff --git a/drivers/cpufreq/scmi-cpufreq.c b/drivers/cpufreq/scmi-cpufreq.c > > > index 50b1551ba894..3f0693439486 100644 > > > --- a/drivers/cpufreq/scmi-cpufreq.c > > > +++ b/drivers/cpufreq/scmi-cpufreq.c > > > @@ -52,9 +52,9 @@ scmi_cpufreq_set_target(struct cpufreq_policy *policy, unsigned int index) > > > int ret; > > > struct scmi_data *priv = policy->driver_data; > > > struct scmi_perf_ops *perf_ops = handle->perf_ops; > > > - u64 freq = policy->freq_table[index].frequency * 1000; > > > + u64 freq = policy->freq_table[index].frequency; > > > > > > - ret = perf_ops->freq_set(handle, priv->domain_id, freq, false); > > > + ret = perf_ops->freq_set(handle, priv->domain_id, freq * 1000, false); > > > if (!ret) > > > arch_set_freq_scale(policy->related_cpus, freq, > > > policy->cpuinfo.max_freq); > > > > Acked-by: Viresh Kumar <viresh.kumar@linaro.org> > > This would be stable-candidate I guess?
Cc: 4.17+ <stable@vger.kernel.org> # v4.17+
-- viresh
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