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References: <20221027115745.240516-1-ulf.hansson@linaro.org>
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From:   Amit Pundir <amit.pundir@linaro.org>
Date:   Thu, 27 Oct 2022 20:29:11 +0530
Message-ID: <CAMi1Hd2Qh-AO8JjwzwqYaQF3kyfC6R3K2t6jy3r2sSApTmwGGw@mail.gmail.com>
Subject: Re: [PATCH] arm64: dts: qcom: sm8250: Disable the not yet supported
 cluster idle state
To:     Ulf Hansson <ulf.hansson@linaro.org>,
        Sudeep Holla <sudeep.holla@arm.com>
Cc:     Andy Gross <agross@kernel.org>,
        Bjorn Andersson <andersson@kernel.org>,
        Konrad Dybcio <konrad.dybcio@somainline.org>,
        Dmitry Baryshkov <dmitry.baryshkov@linaro.org>,
        Maulik Shah <quic_mkshah@quicinc.com>,
        Rajendra Nayak <quic_rjendra@quicinc.com>,
        linux-arm-msm@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
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On Thu, 27 Oct 2022 at 17:27, Ulf Hansson <ulf.hansson@linaro.org> wrote:
>
> To support the deeper cluster idle state for sm8250 platforms, some
> additional synchronization is needed between the rpmh-rsc device and the
> CPU cluster PM domain. Until that is supported, let's disable the cluster
> idle state.
>
> This fixes a problem that has been reported for the Qcom RB5 platform (see
> below), but most likely other sm8250 platforms suffers from similar issues,
> so let's make the fix generic for sm8250.
>
> vreg_l11c_3p3: failed to enable: -ETIMEDOUT
> qcom-rpmh-regulator 18200000.rsc:pm8150l-rpmh-regulators: ldo11: devm_regulator_register() failed, ret=-110
> qcom-rpmh-regulator: probe of 18200000.rsc:pm8150l-rpmh-regulators failed with error -110
>
> Reported-by: Amit Pundir <amit.pundir@linaro.org>
> Fixes: 32bc936d7321 ("arm64: dts: qcom: sm8250: Add cpuidle states")
> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
> ---
>
> This problem was reported by Amit [1] together with an attempt to fix it. It
> turned, that we wanted a more generic fix, hence I posted $subject patch.

Thanks Ulf and Sudeep. This patch along with [2], fixes the above
mentioned crash on RB5 running AOSP.

Tested-by: Amit Pundir <amit.pundir@linaro.org>

Regards,
Amit Pundir

>
> Also note that, $subject patch is also depending (from functionality point of
> view) on a another for genpd [2]. Although, that should soon reach v6.1-rc[n] and
> stable kernels.
>
> Bjorn, can you pick this up as a fix for v6.1-rc and tag it for stable kernels?
>
> Kind regards
> Ulf Hansson
>
> [1]
> https://lore.kernel.org/lkml/20221018145348.4051809-1-amit.pundir@linaro.org/
> [2]
> https://lore.kernel.org/lkml/CAJZ5v0hJxRiL03XDFpU8FuabsHn5i6JMksJ=dfj8B+Dm=s3LYA@mail.gmail.com/
>
> ---
>  arch/arm64/boot/dts/qcom/sm8250.dtsi | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/arch/arm64/boot/dts/qcom/sm8250.dtsi b/arch/arm64/boot/dts/qcom/sm8250.dtsi
> index a5b62cadb129..e276eed1f8e2 100644
> --- a/arch/arm64/boot/dts/qcom/sm8250.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sm8250.dtsi
> @@ -334,6 +334,7 @@ CLUSTER_SLEEP_0: cluster-sleep-0 {
>                                 exit-latency-us = <6562>;
>                                 min-residency-us = <9987>;
>                                 local-timer-stop;
> +                               status = "disabled";
>                         };
>                 };
>         };
> --
> 2.34.1
>