linux-kernel - Re: [PATCH] thermal: Allow selecting the bang-bang governor as default

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Date:   Mon, 12 Jun 2023 19:43:19 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Amit Kucheria <amitk@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>, linux-pm@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] thermal: Allow selecting the bang-bang governor as default

On Mon, Jun 12, 2023 at 11:07 AM Daniel Lezcano
<daniel.lezcano@...aro.org> wrote:
>
>
> Hi Thierry,
>
> On 09/06/2023 14:44, Thierry Reding wrote:
> > From: Thierry Reding <treding@...dia.com>
> >
> > For many setups the bang-bang governor is exactly what we want. Many
> > ARM SoC-based devices use fans to cool down the entire SoC and that
> > works well only with the bang-bang governor because it uses the
> > hysteresis in order to let the fan run for a while to cool the SoC
> > down below the trip point before switching it off again.
>
> Yeah, that trip point detection is screwed up at the moment, but we are
> on the way to solve that. From there, we should be able to have the
> step_wise governor working as the bang-bang governor and remove this one.
>
> Meanwhile, the change sounds ok for me.
>
> Rafael, may I pick this change?

Please do, thank you!