linux-kernel - Re: [PATCH 2/2] arm64: dts: hi6220: Add all CPUs in cooling maps

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Date:   Thu, 5 Jul 2018 10:44:21 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Viresh Kumar <viresh.kumar@...aro.org>,
        Zhang Rui <rui.zhang@...el.com>,
        Eduardo Valentin <edubezval@...il.com>, robh@...nel.org,
        Wei Xu <xuwei5@...ilicon.com>
Cc:     linux-pm@...r.kernel.org,
        Vincent Guittot <vincent.guittot@...aro.org>,
        devicetree@...r.kernel.org, olof@...om.net,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] arm64: dts: hi6220: Add all CPUs in cooling maps

On 05/07/2018 07:09, Viresh Kumar wrote:
> Each CPU can (and does) participate in cooling down the system but the
> DT only captures the CPU0 in the cooling maps. Things work by chance as
> under normal circumstances its the CPU0 which is used by the operating
> systems to probe the cooling devices. But as soon as that ordering
> changes and any other CPU is used to bring up the cooling device, we
> will start seeing errors.
> 
> On the other hand, the hardware is partially defined in DT in these
> cases and we must do a better job by capturing all devices.
> 
> Add all devices (CPUs here) in the cooling maps which are also affected
> by the trip point.
> 
> Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>

Acked-by: Daniel Lezcano <daniel.lezcano@...aro.org>

> ---
>  arch/arm64/boot/dts/hisilicon/hi6220.dtsi | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/boot/dts/hisilicon/hi6220.dtsi b/arch/arm64/boot/dts/hisilicon/hi6220.dtsi
> index 247024df714f..919d36b91bf3 100644
> --- a/arch/arm64/boot/dts/hisilicon/hi6220.dtsi
> +++ b/arch/arm64/boot/dts/hisilicon/hi6220.dtsi
> @@ -886,7 +886,14 @@
>  				cooling-maps {
>  					map0 {
>  						trip = <&target>;
> -						cooling-device = <&cpu0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
> +						cooling-device = <&cpu0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
> +								 <&cpu1 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
> +								 <&cpu2 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
> +								 <&cpu3 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
> +								 <&cpu4 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
> +								 <&cpu5 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
> +								 <&cpu6 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
> +								 <&cpu7 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
>  					};
>  				};
>  			};
> 


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