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

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Date: Wed, 8 May 2024 17:10:05 +0530
From: Anand Moon <linux.amoon@...il.com>
To: Alexey Charkov <alchark@...il.com>
Cc: 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>, 
	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

Hi Alexey,

On Mon, 6 May 2024 at 18:24, Alexey Charkov <alchark@...il.com> wrote:
>
> 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
>

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";

Thanks
-Anand

> _______________________________________________
> Linux-rockchip mailing list
> Linux-rockchip@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-rockchip



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