Re: [PATCH 6/8] arm64: dts: qcom: kaanapali: Add GPU cooling

[Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>]

On Tue, May 12, 2026 at 03:53:20AM +0530, Akhil P Oommen wrote:
> From: Gaurav Kohli <gaurav.kohli@oss.qualcomm.com>
> 
> Unlike the CPU, the GPU does not throttle its speed automatically when it
> reaches high temperatures.
> 
> Set up GPU cooling by throttling the GPU speed
> when reaching 105°C.
> 
> Signed-off-by: Gaurav Kohli <gaurav.kohli@oss.qualcomm.com>
> Signed-off-by: Akhil P Oommen <akhilpo@oss.qualcomm.com>
> ---
>  arch/arm64/boot/dts/qcom/kaanapali.dtsi | 165 ++++++++++++++++++++++++++------
>  1 file changed, 135 insertions(+), 30 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/kaanapali.dtsi b/arch/arm64/boot/dts/qcom/kaanapali.dtsi
> index c57aea44218e..5089416ec32c 100644
> --- a/arch/arm64/boot/dts/qcom/kaanapali.dtsi
> +++ b/arch/arm64/boot/dts/qcom/kaanapali.dtsi
> @@ -26,6 +26,7 @@
>  #include <dt-bindings/soc/qcom,gpr.h>
>  #include <dt-bindings/soc/qcom,rpmh-rsc.h>
>  #include <dt-bindings/sound/qcom,q6dsp-lpass-ports.h>
> +#include <dt-bindings/thermal/thermal.h>
>  
>  #include "kaanapali-ipcc.h"
>  
> @@ -7045,13 +7046,15 @@ nsphmx-3-critical {
>  		};
>  
>  		gpuss-0-thermal {
> +			polling-delay-passive = <200>;

Other DT files use 10 for GPU thermal zones polling interval.

> +
>  			thermal-sensors = <&tsens5 0>;
>  
>  			trips {
> -				gpuss-0-hot {
> -					temperature = <120000>;
> +				gpuss_0_alert0: gpuss-0-alert0 {
> +					temperature = <105000>;
>  					hysteresis = <5000>;
> -					type = "hot";
> +					type = "passive";
>  				};

Why don't we keep both passive and hot trip points?

>  
>  				gpuss-0-critical {
> 

-- 
With best wishes
Dmitry