linux-kernel - RE: [PATCH AUTOSEL 5.1 08/39] arm64: dts: ls1028a: Fix CPU idle fail.

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Date:   Thu, 11 Jul 2019 05:04:24 +0000
From:   Ran Wang <ran.wang_1@....com>
To:     Sasha Levin <sashal@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
CC:     Shawn Guo <shawnguo@...nel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Xiaobo Xie <xiaobo.xie@....com>
Subject: RE: [PATCH AUTOSEL 5.1 08/39] arm64: dts: ls1028a: Fix CPU idle fail.

Hi Sasha, 

    Thanks for helping port this patch to stable.
    May I know if I can submit other bug fixes which has been accepted by upstream to stable by myself?
    If yes, where I can find related process for reference?

Thanks & Regards,
Ran

> -----Original Message-----
> From: Sasha Levin <sashal@...nel.org>
> Sent: Wednesday, July 03, 2019 10:15
> To: linux-kernel@...r.kernel.org; stable@...r.kernel.org
> Cc: Ran Wang <ran.wang_1@....com>; Shawn Guo <shawnguo@...nel.org>;
> Sasha Levin <sashal@...nel.org>; devicetree@...r.kernel.org
> Subject: [PATCH AUTOSEL 5.1 08/39] arm64: dts: ls1028a: Fix CPU idle fail.
> 
> From: Ran Wang <ran.wang_1@....com>
> 
> [ Upstream commit 53f2ac9d3aa881ed419054076042898b77c27ee4 ]
> 
> PSCI spec define 1st parameter's bit 16 of function CPU_SUSPEND to indicate
> CPU State Type: 0 for standby, 1 for power down. In this case, we want to select
> standby for CPU idle feature. But current setting wrongly select power down and
> cause CPU SUSPEND fail every time. Need this fix.
> 
> Fixes: 8897f3255c9c ("arm64: dts: Add support for NXP LS1028A SoC")
> Signed-off-by: Ran Wang <ran.wang_1@....com>
> Signed-off-by: Shawn Guo <shawnguo@...nel.org>
> Signed-off-by: Sasha Levin <sashal@...nel.org>
> ---
>  arch/arm64/boot/dts/freescale/fsl-ls1028a.dtsi | 18 +++++++++---------
>  1 file changed, 9 insertions(+), 9 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/freescale/fsl-ls1028a.dtsi
> b/arch/arm64/boot/dts/freescale/fsl-ls1028a.dtsi
> index 2896bbcfa3bb..228872549f01 100644
> --- a/arch/arm64/boot/dts/freescale/fsl-ls1028a.dtsi
> +++ b/arch/arm64/boot/dts/freescale/fsl-ls1028a.dtsi
> @@ -28,7 +28,7 @@
>  			enable-method = "psci";
>  			clocks = <&clockgen 1 0>;
>  			next-level-cache = <&l2>;
> -			cpu-idle-states = <&CPU_PH20>;
> +			cpu-idle-states = <&CPU_PW20>;
>  		};
> 
>  		cpu1: cpu@1 {
> @@ -38,7 +38,7 @@
>  			enable-method = "psci";
>  			clocks = <&clockgen 1 0>;
>  			next-level-cache = <&l2>;
> -			cpu-idle-states = <&CPU_PH20>;
> +			cpu-idle-states = <&CPU_PW20>;
>  		};
> 
>  		l2: l2-cache {
> @@ -53,13 +53,13 @@
>  		 */
>  		entry-method = "arm,psci";
> 
> -		CPU_PH20: cpu-ph20 {
> -			compatible = "arm,idle-state";
> -			idle-state-name = "PH20";
> -			arm,psci-suspend-param = <0x00010000>;
> -			entry-latency-us = <1000>;
> -			exit-latency-us = <1000>;
> -			min-residency-us = <3000>;
> +		CPU_PW20: cpu-pw20 {
> +			  compatible = "arm,idle-state";
> +			  idle-state-name = "PW20";
> +			  arm,psci-suspend-param = <0x0>;
> +			  entry-latency-us = <2000>;
> +			  exit-latency-us = <2000>;
> +			  min-residency-us = <6000>;
>  		};
>  	};
> 
> --
> 2.20.1