linux-kernel - Re: [PATCH] arm64: dts: qcom: qrb5165-rb5: Disable cpuidle states

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Message-ID: <CAMi1Hd3LsFYyC3Ywv=uTVB1d07NqBDxwryYBEJz7AqdxYo72wg@mail.gmail.com>
Date:   Wed, 19 Oct 2022 21:04:23 +0530
From:   Amit Pundir <amit.pundir@...aro.org>
To:     Ulf Hansson <ulf.hansson@...aro.org>
Cc:     Sudeep Holla <sudeep.holla@....com>,
        Bjorn Andersson <andersson@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Maulik Shah <quic_mkshah@...cinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        dt <devicetree@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] arm64: dts: qcom: qrb5165-rb5: Disable cpuidle states

On Wed, 19 Oct 2022 at 17:28, Ulf Hansson <ulf.hansson@...aro.org> wrote:
>
> On Tue, 18 Oct 2022 at 16:53, Amit Pundir <amit.pundir@...aro.org> wrote:
> >
> > Disable cpuidle states for RB5. These cpuidle states
> > made the device highly unstable and it runs into the
> > following crash frequently:
> >
> > [    T1] vreg_l11c_3p3: failed to enable: -ETIMEDOUT
> > [    T1] qcom-rpmh-regulator 18200000.rsc:pm8150l-rpmh-regulators: ldo11: devm_regulator_register() failed, ret=-110
> > [    T1] qcom-rpmh-regulator: probe of 18200000.rsc:pm8150l-rpmh-regulators failed with error -110
> >
> > Fixes: 32bc936d7321 ("arm64: dts: qcom: sm8250: Add cpuidle states")
> > Signed-off-by: Amit Pundir <amit.pundir@...aro.org>
> > ---
> >  arch/arm64/boot/dts/qcom/qrb5165-rb5.dts | 8 ++++++++
> >  1 file changed, 8 insertions(+)
> >
> > diff --git a/arch/arm64/boot/dts/qcom/qrb5165-rb5.dts b/arch/arm64/boot/dts/qcom/qrb5165-rb5.dts
> > index cc003535a3c5..f936c41bfbea 100644
> > --- a/arch/arm64/boot/dts/qcom/qrb5165-rb5.dts
> > +++ b/arch/arm64/boot/dts/qcom/qrb5165-rb5.dts
> > @@ -251,6 +251,14 @@ qca639x: qca639x {
> >
> >  };
> >
> > +&LITTLE_CPU_SLEEP_0 {
> > +       status = "disabled";
> > +};
> > +
> > +&BIG_CPU_SLEEP_0 {
> > +       status = "disabled";
> > +};
> > +
> >  &adsp {
> >         status = "okay";
> >         firmware-name = "qcom/sm8250/adsp.mbn";
> > --
> > 2.25.1
>
> Disabling the CPU idlestates, will revert us back to using only the WFI state.
>
> An option that probably works too is to just drop the idlestate for
> the CPU cluster. Would you mind trying the below and see if that works
> too?

Following change works too for my RB5 setup.
I didn't see any obvious regression in my limited (~10) test runs so far.

Regards,
Amit Pundir

>
> diff --git a/arch/arm64/boot/dts/qcom/sm8250.dtsi
> b/arch/arm64/boot/dts/qcom/sm8250.dtsi
> index c32227ea40f9..c707a49e8001 100644
> --- a/arch/arm64/boot/dts/qcom/sm8250.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sm8250.dtsi
> @@ -700,7 +700,6 @@ CPU_PD7: cpu7 {
>
>                 CLUSTER_PD: cpu-cluster0 {
>                         #power-domain-cells = <0>;
> -                       domain-idle-states = <&CLUSTER_SLEEP_0>;
>                 };
>         };
>
> Kind regards
> Uffe