linux-kernel - Re: [PATCH 1/2] dts: rockchip: raise GPU trip point temperature for veyron to 72.5 degC

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Date:   Wed, 15 May 2019 14:37:03 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Doug Anderson <dianders@...omium.org>
Cc:     Heiko Stuebner <heiko@...ech.de>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
        devicetree@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] dts: rockchip: raise GPU trip point temperature for
 veyron to 72.5 degC

Hi Doug,

thanks for the review!

On Wed, May 15, 2019 at 11:30:24AM -0700, Doug Anderson wrote:
> Hi,
> 
> On Wed, May 15, 2019 at 8:31 AM Matthias Kaehlcke <mka@...omium.org> wrote:
> 
> > This value matches what is used by the downstream Chrome OS 3.14
> > kernel, the 'official' kernel for veyron devices.
> >
> > Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
> > ---
> >  arch/arm/boot/dts/rk3288-veyron.dtsi | 8 ++++++++
> >  1 file changed, 8 insertions(+)
> >
> > diff --git a/arch/arm/boot/dts/rk3288-veyron.dtsi b/arch/arm/boot/dts/rk3288-veyron.dtsi
> > index 1252522392c7..169da06e1c09 100644
> > --- a/arch/arm/boot/dts/rk3288-veyron.dtsi
> > +++ b/arch/arm/boot/dts/rk3288-veyron.dtsi
> > @@ -446,6 +446,14 @@
> >         status = "okay";
> >  };
> >
> > +&gpu_thermal {
> > +       trips {
> > +               gpu_alert0: gpu_alert0 {
> > +                       temperature = <72500>; /* millicelsius */
> > +               };
> > +       };
> > +};
> > +
> 
> This should be sorted alphabetically.  Thus this should sort right
> after this in rk3288-veyron.dtsi
> 
> &gpu {
>   mali-supply = <&vdd_gpu>;
>   status = "okay";
> };

will do in the next revision.

> Also you don't need to replicate the whole structure?  I think the
> above should just be:
> 
> &gpu_alert0 {
>   temperature = <72500>; /* millicelsius */
> };

ack

> NOTE also that that gpu and cpu critical is 100 C downstream.  Should
> we do that too?

I missed this delta, yes let's do this too in this series.

> Ah, but before we do that I guess we'd need to also  override the
> "rockchip,hw-tshut-temp" to 125000 to match downstream. I guess that
> could be a separate series?

Yes, the value should at least be higher than the critical trip point,
matching downstream seems to make sense.