linux-kernel - Re: [PATCH v4 2/6] arm64: dts: rockchip: enable thermal management on all RK3588 boards

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Date: Mon, 6 May 2024 16:54:02 +0400
From: Alexey Charkov <alchark@...il.com>
To: Diederik de Haas <didi.debian@...ow.org>
Cc: Rob Herring <robh+dt@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, 
	Heiko Stuebner <heiko@...ech.de>, Daniel Lezcano <daniel.lezcano@...aro.org>, 
	Dragan Simic <dsimic@...jaro.org>, Viresh Kumar <viresh.kumar@...aro.org>, 
	Chen-Yu Tsai <wens@...nel.org>, devicetree@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, linux-rockchip@...ts.infradead.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 2/6] arm64: dts: rockchip: enable thermal management on
 all RK3588 boards

Hello Diederik,

On Mon, May 6, 2024 at 4:29 PM Diederik de Haas <didi.debian@...ow.org> wrote:
>
> Hi,
>
> On Monday, 6 May 2024 11:36:33 CEST Alexey Charkov wrote:
> > This enables the on-chip thermal monitoring sensor (TSADC) on all
> > RK3588(s) boards that don't have it enabled yet. It provides temperature
> > monitoring for the SoC and emergency thermal shutdowns, and is thus
> > important to have in place before CPU DVFS is enabled, as high CPU
> > operating performance points can overheat the chip quickly in the
> > absence of thermal management.
> >
> > Signed-off-by: Alexey Charkov <alchark@...il.com>
> > ---
> >  arch/arm64/boot/dts/rockchip/rk3588-rock-5b.dts               | 4 ++++
> >  8 files changed, 32 insertions(+)
> >
> > diff --git a/arch/arm64/boot/dts/rockchip/rk3588-rock-5b.dts
> > b/arch/arm64/boot/dts/rockchip/rk3588-rock-5b.dts index
> > b8e15b76a8a6..21e96c212dd8 100644
> > --- a/arch/arm64/boot/dts/rockchip/rk3588-rock-5b.dts
> > +++ b/arch/arm64/boot/dts/rockchip/rk3588-rock-5b.dts
> > @@ -742,6 +742,10 @@ regulator-state-mem {
> >       };
> >  };
> >
> > +&tsadc {
> > +     status = "okay";
> > +};
> > +
> >  &uart2 {
> >       pinctrl-0 = <&uart2m0_xfer>;
> >       status = "okay";
>
> I built a kernel with v3 of your patch set and someone tested it on a ROCK 5B
> 'for me' and it had the following line in dmesg:
>
> rockchip-thermal fec00000.tsadc: Missing rockchip,grf property
>
> I'm guessing that turned up due to enabling tsadc, but (also) in v4 I didn't
> see a change wrt "rockchip,grf".
> Should that be done? (asking; I don't know)

I'm getting the same. Neither the mainline TSADC driver [1], nor the
downstream one [2] seems to use the grf pointer on RK3588 at all. It
still works in spite of that warning, although I can't see how (or if)
it configures the reset mechanism without those GRF registers.

Best regards,
Alexey

[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/thermal/rockchip_thermal.c#n818
[2] https://github.com/radxa/kernel/blob/stable-5.10-rock5/drivers/thermal/rockchip_thermal.c#L961