linux-kernel - Re: [linux-sunxi] [PATCH 0/7] Add support for Allwinner H6 DVFS

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Message-ID: <CAJiuCceROWv1ni3YZ6rU71O9R__t6ZOgnkZQDjBhJvhqHRAVng@mail.gmail.com>
Date:   Sun, 5 Apr 2020 17:01:51 +0200
From:   Clément Péron <peron.clem@...il.com>
To:     Ondřej Jirman <megous@...ous.com>,
        Clément Péron <peron.clem@...il.com>,
        Maxime Ripard <mripard@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>, Rob Herring <robh+dt@...nel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>
Subject: Re: [linux-sunxi] [PATCH 0/7] Add support for Allwinner H6 DVFS

Hi,

On Sun, 5 Apr 2020 at 16:54, Ondřej Jirman <megous@...ous.com> wrote:
>
> Hi,
>
> On Sun, Apr 05, 2020 at 04:33:37PM +0200, Clément Péron wrote:
> > Hi Ondřej,
>
> [ ... ]
>
> > Good point, this information should be added for both CPU and GPU regulator.
> > This could be nice to confirm this point with a scope.
> >
> > Also I remark that Allwinner user higher temperature than what we set :
> > alarm_low_temp = <105000>;
> > alarm_high_temp = <110000>;
> > alarm_temp_hysteresis = <15000>;
> > shut_temp= <115000>;
> > https://github.com/orangepi-xunlong/OrangePiH6_Linux4_9/blob/master/arch/arm64/boot/dts/sunxi/sun50iw6p1.dtsi#L1924
> >
> > Don't you think that we can push a bit higher the temperature it's
> > actually at 80°C ?
>
> We probably can. But just 5°C between high temp and criticla temp is probably
> not enough. I'd probably set our value to something like 90-100°C so that quick
> temperature spike before regulation kicks in would not shutdown the CPU.

OK I will push it to 85°C and leave the critical to 100°C.

Test it again and will send a v2

Regards,
Clément

>
> regards,
>         o.
>
> > Thanks for the review,
> > Clement
> >