linux-kernel - Re: [PATCH] arm64: dts: mt8173: Fix cpu

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Date:   Fri, 13 Jan 2017 16:36:17 +0100
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Daniel Kurtz <djkurtz@...omium.org>
Cc:     Dawei Chien <dawei.chien@...iatek.com>,
        Javi Merino <javi.merino@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Tiffany Lin <tiffany.lin@...iatek.com>,
        CK Hu <ck.hu@...iatek.com>,
        Andrew-CT Chen <andrew-ct.chen@...iatek.com>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Minghsiu Tsai <minghsiu.tsai@...iatek.com>,
        Yong Wu <yong.wu@...iatek.com>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "moderated list:ARM64 PORT (AARCH64 ARCHITECTURE)" 
        <linux-arm-kernel@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH] arm64: dts: mt8173: Fix cpu_thermal cooling-maps
 contributions



On 13/01/17 03:30, Daniel Kurtz wrote:
> According to [0], the contribution field for each cooling-device express
> their relative power efficiency. Higher weights express higher power
> efficiency.  Weighting is relative such that if each cooling device has a
> weight of 1 they are considered equal. This is particularly useful in
> heterogeneous systems where two cooling devices may perform the same kind
> of compute, but with different efficiency.
>
> [0] Documentation/thermal/power_allocator.txt
>
> According to Mediatek IC designer, the power efficiency ratio between the
> LITTLE core cluster (cooling-device cpu0) and big core cluster
> (cooling-device cpu1) is around 3:1 (3072:1024).
>
> Signed-off-by: Daniel Kurtz <djkurtz@...omium.org>
> ---
>  arch/arm64/boot/dts/mediatek/mt8173.dtsi | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>

applied, thanks.

> diff --git a/arch/arm64/boot/dts/mediatek/mt8173.dtsi b/arch/arm64/boot/dts/mediatek/mt8173.dtsi
> index 12e702771f5c..9a3b0d20f7a8 100644
> --- a/arch/arm64/boot/dts/mediatek/mt8173.dtsi
> +++ b/arch/arm64/boot/dts/mediatek/mt8173.dtsi
> @@ -182,12 +182,12 @@
>  				map@0 {
>  					trip = <&target>;
>  					cooling-device = <&cpu0 0 0>;
> -					contribution = <1024>;
> +					contribution = <3072>;
>  				};
>  				map@1 {
>  					trip = <&target>;
>  					cooling-device = <&cpu2 0 0>;
> -					contribution = <2048>;
> +					contribution = <1024>;
>  				};
>  			};
>  		};
>