linux-kernel - Re: [PATCH v2] arm64: dts: qcom: sc7280: Add capacity and DPC properties

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Message-ID: <CAD=FV=VTCXSQo3Bo3G7oJ48qA-fUet5rHAzT8WLM1Hx70KyYMA@mail.gmail.com>
Date:   Mon, 6 Nov 2023 08:56:01 -0800
From:   Doug Anderson <dianders@...omium.org>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>
Cc:     Ankit Sharma <quic_anshar@...cinc.com>,
        cros-qcom-dts-watchers@...omium.org, agross@...nel.org,
        andersson@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, quic_ashayj@...cinc.com,
        quic_atulpant@...cinc.com, quic_rgottimu@...cinc.com,
        quic_shashim@...cinc.com, quic_pkondeti@...cinc.com
Subject: Re: [PATCH v2] arm64: dts: qcom: sc7280: Add capacity and DPC properties

Hi,

On Sat, Nov 4, 2023 at 4:52 AM Konrad Dybcio <konrad.dybcio@...aro.org> wrote:
>
>
>
> On 11/3/23 11:54, Ankit Sharma wrote:
> > The "capacity-dmips-mhz" and "dynamic-power-coefficient" are
> > used to build Energy Model which in turn is used by EAS to take
> > placement decisions. So add it to SC7280 soc.
> >
> > Signed-off-by: Ankit Sharma <quic_anshar@...cinc.com>
> > ---Hi, thanks for this patch
>
> Reviewed-by: Konrad Dybcio <konrad.dybcio@...aro.org>
>
> I performed a quick grep in arch/arm64/boot/dts/qcom and noticed
> that at least one of these values is missing for:
>
> rg -l --files-without-match dynamic-power-coeff $(rg cpu@ -l) | sort
> ipq5018.dtsi (homogeneous cluster)
> ipq5332.dtsi (homogeneous cluster)
> ipq6018.dtsi (homogeneous cluster)
> ipq8074.dtsi (homogeneous cluster)
> ipq9574.dtsi (homogeneous cluster)
> msm8916.dtsi (homogeneous cluster)
> msm8939.dtsi
> msm8953.dtsi
> msm8976.dtsi
> msm8994.dtsi
> msm8996.dtsi
> msm8998.dtsi
> qcs404.dtsi (homogeneous cluster)
> qdu1000.dtsi (homogeneous cluster)
> sa8775p.dtsi
> sc7280.dtsi
> sc8180x.dtsi
> sc8280xp.dtsi
> sdm630.dtsi
> sm4450.dtsi
> sm6125.dtsi
> sm6375.dtsi
> sm8350.dtsi
> sm8450.dtsi
>
> rg -l --files-without-match capacity-dmips $(rg cpu@ -l) | sort
> ipq5018.dtsi (homogeneous cluster)
> ipq5332.dtsi (homogeneous cluster)
> ipq6018.dtsi (homogeneous cluster)
> ipq8074.dtsi (homogeneous cluster)
> ipq9574.dtsi (homogeneous cluster)
> msm8916.dtsi (homogeneous cluster)
> msm8939.dtsi
> msm8994.dtsi
> qcs404.dtsi (homogeneous cluster)
> qdu1000.dtsi (homogeneous cluster)
> sa8775p.dtsi
> sc7280.dtsi
> sm4450.dtsi
> sm6375.dtsi
> sm8350.dtsi
> sm8450.dtsi
>
> Where platforms with a single, homogeneous cluster likely don't
> benefit from EAS..
>
> Is there any chance you could dig up the correct values, for at least
> some of these platforms? Or would you know whom to ask?
>
> FWIW the one we're missing the most is sc8280xp..

FWIW, I wrote up a longwinded commit message when I added these values
for sc7180. See commit 82ea7d411d43 ("arm64: dts: qcom: sc7180: Base
dynamic CPU power coefficients in reality").

The short of it is that if you have hardware and a basic "smart
battery" to measure power consumption it's pretty easy for anyone to
add some reasonable numbers.

-Doug