linux-kernel - Re: [PATCH] arm64: dts: qcom: msm8998-clamshell: Remove retention idle state

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Date:   Fri, 4 Oct 2019 09:24:01 +0530
From:   Amit Kucheria <amit.kucheria@...durent.com>
To:     Jeffrey Hugo <jeffrey.l.hugo@...il.com>
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Andy Gross <agross@...nel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] arm64: dts: qcom: msm8998-clamshell: Remove retention
 idle state

On Thu, Oct 3, 2019 at 12:44 AM Jeffrey Hugo <jeffrey.l.hugo@...il.com> wrote:
>
> The retention idle state does not appear to be supported by the firmware
> present on the msm8998 laptops since the state is advertised as disabled
> in ACPI, and attempting to enable the state in DT is observed to result
> in boot hangs.  Therefore, remove the state from use to address the
> observed issues.
>
> Fixes: 2c6d2d3a580a (arm64: dts: qcom: Add Lenovo Miix 630)
> Signed-off-by: Jeffrey Hugo <jeffrey.l.hugo@...il.com>

Reviewed-by: Amit Kucheria <amit.kucheria@...aro.org>

> ---
>  .../boot/dts/qcom/msm8998-clamshell.dtsi      | 37 +++++++++++++++++++
>  1 file changed, 37 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/qcom/msm8998-clamshell.dtsi b/arch/arm64/boot/dts/qcom/msm8998-clamshell.dtsi
> index 9682d4dd7496..1bae90705746 100644
> --- a/arch/arm64/boot/dts/qcom/msm8998-clamshell.dtsi
> +++ b/arch/arm64/boot/dts/qcom/msm8998-clamshell.dtsi
> @@ -23,6 +23,43 @@
>         };
>  };
>
> +/*
> + * The laptop FW does not appear to support the retention state as it is
> + * not advertised as enabled in ACPI, and enabling it in DT can cause boot
> + * hangs.
> + */
> +&CPU0 {
> +       cpu-idle-states = <&LITTLE_CPU_SLEEP_1>;
> +};
> +
> +&CPU1 {
> +       cpu-idle-states = <&LITTLE_CPU_SLEEP_1>;
> +};
> +
> +&CPU2 {
> +       cpu-idle-states = <&LITTLE_CPU_SLEEP_1>;
> +};
> +
> +&CPU3 {
> +       cpu-idle-states = <&LITTLE_CPU_SLEEP_1>;
> +};
> +
> +&CPU4 {
> +       cpu-idle-states = <&BIG_CPU_SLEEP_1>;
> +};
> +
> +&CPU5 {
> +       cpu-idle-states = <&BIG_CPU_SLEEP_1>;
> +};
> +
> +&CPU6 {
> +       cpu-idle-states = <&BIG_CPU_SLEEP_1>;
> +};
> +
> +&CPU7 {
> +       cpu-idle-states = <&BIG_CPU_SLEEP_1>;
> +};
> +
>  &qusb2phy {
>         status = "okay";
>
> --
> 2.17.1
>