linux-kernel - Re: [PATCH] cpufreq: scmi: Fix frequency invariance in slow path

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Date:   Fri, 11 Jan 2019 11:41:45 +0100
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Sudeep Holla <sudeep.holla@....com>,
        Quentin Perret <quentin.perret@....com>
Cc:     viresh.kumar@...aro.org, linux-arm-kernel@...ts.infradead.org,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        dietmar.eggemann@....com, qais.yousef@....com
Subject: Re: [PATCH] cpufreq: scmi: Fix frequency invariance in slow path

On Wednesday, January 9, 2019 11:59:45 AM CET Sudeep Holla wrote:
> On Wed, Jan 09, 2019 at 10:42:36AM +0000, 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")
> 
> Good find.
> 
> Acked-by: Sudeep Holla <sudeep.holla@....com>

Applied, thanks!