linux-kernel - Re: [PATCH] powercap/drivers/dtpm: Disable dtpm at boot time

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Message-ID: <CAAYoRsWEXoe_LjuHuQUL3Tdov0JVW887T4ciUTVOC410mZjgvA@mail.gmail.com>
Date:   Fri, 26 Nov 2021 17:13:09 -0800
From:   Doug Smythies <dsmythies@...us.net>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Linux PM list <linux-pm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Lukasz Luba <lukasz.luba@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Daniel Lezcano <daniel.lezcano@...nel.org>,
        dsmythies <dsmythies@...us.net>
Subject: Re: [PATCH] powercap/drivers/dtpm: Disable dtpm at boot time

On Fri, Nov 26, 2021 at 3:10 PM Daniel Lezcano
<daniel.lezcano@...aro.org> wrote:
>
>
> Hi Doug,
>
> I was unable to reproduce the issue because I don't have an x86 platform.
>
> Is it possible to check if this fix is ok?

Hi Daniel,

Yes, confirmed.

Tested-By: Doug Smythies <dsmythies@...us.net>

>
>   -- Daniel
>
> On 27/11/2021 00:08, Daniel Lezcano wrote:
> > The DTPM framework misses a mechanism to set it up. That is currently
> > under review but will come after the next cycle.
> >
> > As the distro are enabling all the kernel options, the DTPM framework
> > is enabled on platforms where the energy model is not implemented,
> > thus making the framework inconsistent and disrupting the CPU
> > frequency scaling service.
> >
> > Remove the initialization at boot time as a hot fix.
> >
> > Fixes: 7a89d7eacf8e ("powercap/drivers/dtpm: Simplify the dtpm table")
> > Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
> > ---
> >  drivers/powercap/dtpm.c | 3 ---
> >  1 file changed, 3 deletions(-)
> >
> > diff --git a/drivers/powercap/dtpm.c b/drivers/powercap/dtpm.c
> > index b9fac786246a..fb35c5828bfb 100644
> > --- a/drivers/powercap/dtpm.c
> > +++ b/drivers/powercap/dtpm.c
> > @@ -471,9 +471,6 @@ static int __init init_dtpm(void)
> >               return PTR_ERR(pct);
> >       }
> >
> > -     for_each_dtpm_table(dtpm_descr)
> > -             dtpm_descr->init();
> > -
> >       return 0;
> >  }
> >  late_initcall(init_dtpm);
> >
>
>
> --
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