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 <20210401183654.27214-3-daniel.lezcano@linaro.org> <CAAYoRsURO1tf03nfiki1uaXYEmTKQyYKUeTyKW+vefrVzCO7jg@mail.gmail.com>
 <1e75f7ff-4b1b-ff47-2344-903605067693@linaro.org>
In-Reply-To: <1e75f7ff-4b1b-ff47-2344-903605067693@linaro.org>
From:   "Rafael J. Wysocki" <rafael@kernel.org>
Date:   Fri, 26 Nov 2021 19:23:21 +0100
Message-ID: <CAJZ5v0jtOVs=P2HxGoL2pATwCj9ZxsAnH_ZWL_vMFNjpMsqrng@mail.gmail.com>
Subject: Re: [PATCH v6 3/7] powercap/drivers/dtpm: Simplify the dtpm table
To:     Daniel Lezcano <daniel.lezcano@linaro.org>
Cc:     Doug Smythies <dsmythies@telus.net>,
        Linux PM list <linux-pm@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Lukasz Luba <lukasz.luba@arm.com>,
        "Rafael J. Wysocki" <rafael@kernel.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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On Fri, Nov 26, 2021 at 6:40 PM Daniel Lezcano
<daniel.lezcano@linaro.org> wrote:
>
> On 26/11/2021 18:08, Doug Smythies wrote:
> > Hi Daniel,
> >
> > This patch introduces a regression, at least on my test system.
> > I can no longer change CPU frequency scaling drivers, for example
> > from intel_cpufreq (A.K.A intel_pstate in passive mode) to intel_pstate
> > (A.K.A. active mode). The task just hangs forever.
> >
> > I bisected the kernel and got this commit as the result.
> > As a double check, I reverted this commit:
> > 7a89d7eacf8e84f2afb94db5ae9d9f9faa93f01c
> > on kernel 5.16-rc2 and the issue was resolved.
> >
> > While your email is fairly old, I observe that it was only included as of
> > kernel 5.16-rc1.
>
> Could it be related to and fixed by:
>
> https://lore.kernel.org/all/20211108062345.273855-1-daniel.lezcano@linaro.org/
>
> ?

It seems so, but that patch is present in 5.16-rc2.