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

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Message-ID: <a1fb157c88f420cd85d56edff2a4d85b@manjaro.org>
Date: Wed, 08 May 2024 13:46:06 +0200
From: Dragan Simic <dsimic@...jaro.org>
To: Anand Moon <linux.amoon@...il.com>
Cc: Alexey Charkov <alchark@...il.com>, Diederik de Haas
 <didi.debian@...ow.org>, 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>, 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 Anand,

On 2024-05-08 13:40, Anand Moon wrote:
> On Mon, 6 May 2024 at 18:24, Alexey Charkov <alchark@...il.com> wrote:
>> On Mon, May 6, 2024 at 4:29 PM Diederik de Haas 
>> <didi.debian@...ow.org> wrote:
>> > 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
>> 
> 
> If the following changes fix the warning.
> 
> Checking the Rockchip RK3588 TRM V1.0-Part1-20220309.pdf
> PMU1GRF_SOC_CON3 which has tsadc_shut_reset_trigger_en bit
> to control the Enable TSADC shut reset trigger for DDR fail safe.
> 
> diff --git a/arch/arm64/boot/dts/rockchip/rk3588s.dtsi
> b/arch/arm64/boot/dts/rockchip/rk3588s.dtsi
> index 85c25d5efdad..5490a44e093e 100644
> --- a/arch/arm64/boot/dts/rockchip/rk3588s.dtsi
> +++ b/arch/arm64/boot/dts/rockchip/rk3588s.dtsi
> @@ -2662,6 +2662,7 @@ tsadc: tsadc@...00000 {
>                 rockchip,hw-tshut-temp = <120000>;
>                 rockchip,hw-tshut-mode = <0>; /* tshut mode 0:CRU 
> 1:GPIO */
>                 rockchip,hw-tshut-polarity = <0>; /* tshut polarity
> 0:LOW 1:HIGH */
> +               rockchip,pmu = <&pmu1grf>;
>                 pinctrl-0 = <&tsadc_gpio_func>;
>                 pinctrl-1 = <&tsadc_shut>;
>                 pinctrl-names = "gpio", "otpout";

Basically, the rockchip_thermal driver doesn't use GRF at all on
the RK3588(s), so virtually any value specified as "rockchip,pmu"
can eliminate the warning.

I'm already working on a rather large device-tree cleanup series,
and this is already fixed in it.  Are you fine with dropping your
patch as a separate one, and I'll tag you with Co-developed-by in
the relevant patch from my series?