linux-kernel - Re: [PATCH RESEND] arm64: dts: allwinner: a64: Add thermal trip points for GPU

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Date: Tue, 09 Jan 2024 21:13:02 +0100
From: Jernej Škrabec <jernej.skrabec@...il.com>
To: anarsoul@...il.com, tiny.windzz@...il.com, linux-sunxi@...ts.linux.dev,
 Alexey Klimov <alexey.klimov@...aro.org>
Cc: rafael@...nel.org, devicetree@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 wens@...e.org, samuel@...lland.org, daniel.lezcano@...aro.org,
 peter.griffin@...aro.org, klimov.linux@...il.com
Subject:
 Re: [PATCH RESEND] arm64: dts: allwinner: a64: Add thermal trip points for
 GPU

Hi Alexey!

Dne ponedeljek, 01. januar 2024 ob 01:00:08 CET je Alexey Klimov napisal(a):
> 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

Please no Linux specific talk. Since DT is OS neutral let just talk about HW.

> 
> 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@...lland.org>
> Cc: Jernej Skrabec <jernej.skrabec@...il.com>
> Cc: Chen-Yu Tsai <wens@...e.org>
> Cc: Daniel Lezcano <daniel.lezcano@...aro.org>
> Cc: devicetree@...r.kernel.org
> Signed-off-by: Alexey Klimov <alexey.klimov@...aro.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";
> +				};

Since GPU has OPP, can you add cooling maps with at least first trip point?

Best regards,
Jernej

> +
> +				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";
> +				};
> +			};
>  		};
>  	};
>  
>