linux-kernel - Re: [PATCH] arm64: dts: rockchip: Add dynamic-power-coefficient to rk3399 GPU

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Date:   Mon, 27 Nov 2023 18:02:06 +0800
From:   Chen-Yu Tsai <wenst@...omium.org>
To:     Lukasz Luba <lukasz.luba@....com>
Cc:     linux-kernel@...r.kernel.org, linux-rockchip@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        heiko@...ech.de, conor+dt@...nel.org, daniel.lezcano@...aro.org
Subject: Re: [PATCH] arm64: dts: rockchip: Add dynamic-power-coefficient to
 rk3399 GPU

On Mon, Nov 27, 2023 at 4:14 PM Lukasz Luba <lukasz.luba@....com> wrote:
>
> Add dynamic-power-coefficient to the GPU node. That will create Energy
> Model for the GPU based on the coefficient and OPP table information.
> It will enable mechanism such as DTMP or IPA to work with the GPU DVFS.
> In similar way the Energy Model for CPUs in rk3399 is created, so both
> are aligned in power scale. The maximum power used from this coefficient
> is 1.5W at 600MHz.
>
> Signed-off-by: Lukasz Luba <lukasz.luba@....com>
> ---
>  arch/arm64/boot/dts/rockchip/rk3399.dtsi | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/arch/arm64/boot/dts/rockchip/rk3399.dtsi b/arch/arm64/boot/dts/rockchip/rk3399.dtsi
> index 9da0b6d77c8d..87cfdf570b19 100644
> --- a/arch/arm64/boot/dts/rockchip/rk3399.dtsi
> +++ b/arch/arm64/boot/dts/rockchip/rk3399.dtsi
> @@ -2113,6 +2113,7 @@ gpu: gpu@...a0000 {
>                 interrupt-names = "job", "mmu", "gpu";
>                 clocks = <&cru ACLK_GPU>;
>                 #cooling-cells = <2>;
> +               dynamic-power-coefficient = <2640>;

For reference, in the ChromeOS downstrean v5.10 kernel we have:

gpu_power_model: power_model {
        compatible = "arm,mali-simple-power-model";
        static-coefficient = <411522>;
        dynamic-coefficient = <977>;
        ts = <32000 4700 (-80) 2>;
        thermal-zone = "gpu";
};

This is for the Mali kbase.

ChenYu

>                 power-domains = <&power RK3399_PD_GPU>;
>                 status = "disabled";
>         };
> --
> 2.25.1
>
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

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