Messages in this thread Patch in this message | | | Date | Fri, 12 Jan 2024 16:32:45 +0000 | From | Andre Przywara <> | Subject | Re: [PATCH RESEND] arm64: dts: allwinner: a64: Add thermal trip points for GPU |
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On Mon, 1 Jan 2024 00:00:08 +0000 Alexey Klimov <alexey.klimov@linaro.org> wrote:
Hi Alexey,
> Without trip points for GPU, the following errors are printed in the > dmesg log and the sun8i-thermal driver fails to load: > > thermal_sys: Failed to find 'trips' node > thermal_sys: Failed to find trip points for thermal-sensor id=1 > sun8i-thermal: probe of 1c25000.thermal-sensor failed with error -22
Regardless of whether we should really *require* trip points (what Icenowy wanted to fix), I think it's good to have those values in the DT.
The only question I have: where do those values come from? Is this coming from some BSP, or some downstream repository? If there are multiple sources: are the values across them consistent? I have seen a lot careless and unreflecting copy&paste in the past, so just want to make sure we get the right values.
Cheers, Andre
> When thermal zones are defined, trip points definitions are mandatory. > Trip values for the GPU are assumed to be the same values as the CPU > ones. The available specs do not provide any hints about thermal regimes > for the GPU and it seems GPU is implemented on the same die as the CPU. > > Tested on Pine a64+. > > Cc: Samuel Holland <samuel@sholland.org> > Cc: Jernej Skrabec <jernej.skrabec@gmail.com> > Cc: Chen-Yu Tsai <wens@csie.org> > Cc: Daniel Lezcano <daniel.lezcano@linaro.org> > Cc: devicetree@vger.kernel.org > Signed-off-by: Alexey Klimov <alexey.klimov@linaro.org> > --- > arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi | 46 +++++++++++++++++++ > 1 file changed, 46 insertions(+) > > diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi > index 62f45f71ec65..07963eea1bf0 100644 > --- a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi > +++ b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi > @@ -243,6 +243,29 @@ gpu0_thermal: gpu0-thermal { > polling-delay-passive = <0>; > polling-delay = <0>; > thermal-sensors = <&ths 1>; > + > + trips { > + gpu0_alert0: gpu0_alert0 { > + /* milliCelsius */ > + temperature = <75000>; > + hysteresis = <2000>; > + type = "passive"; > + }; > + > + gpu0_alert1: gpu0_alert1 { > + /* milliCelsius */ > + temperature = <90000>; > + hysteresis = <2000>; > + type = "hot"; > + }; > + > + gpu0_crit: gpu0_crit { > + /* milliCelsius */ > + temperature = <110000>; > + hysteresis = <2000>; > + type = "critical"; > + }; > + }; > }; > > gpu1_thermal: gpu1-thermal { > @@ -250,6 +273,29 @@ gpu1_thermal: gpu1-thermal { > polling-delay-passive = <0>; > polling-delay = <0>; > thermal-sensors = <&ths 2>; > + > + trips { > + gpu1_alert0: gpu1_alert0 { > + /* milliCelsius */ > + temperature = <75000>; > + hysteresis = <2000>; > + type = "passive"; > + }; > + > + gpu1_alert1: gpu1_alert1 { > + /* milliCelsius */ > + temperature = <90000>; > + hysteresis = <2000>; > + type = "hot"; > + }; > + > + gpu1_crit: gpu1_crit { > + /* milliCelsius */ > + temperature = <110000>; > + hysteresis = <2000>; > + type = "critical"; > + }; > + }; > }; > }; >
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