linux-kernel - [PATCH] arm64: dts: mt8173: Fix cpu_thermal cooling-maps contributions

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Date:   Fri, 13 Jan 2017 10:30:05 +0800
From:   Daniel Kurtz <djkurtz@...omium.org>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Dawei Chien <dawei.chien@...iatek.com>,
        Javi Merino <javi.merino@....com>,
        Daniel Kurtz <djkurtz@...omium.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Matthias Brugger <matthias.bgg@...il.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>,
        devicetree@...r.kernel.org (open list:OPEN FIRMWARE AND FLATTENED
        DEVICE TREE BINDINGS),
        linux-arm-kernel@...ts.infradead.org (moderated list:ARM64 PORT
        (AARCH64 ARCHITECTURE)), linux-kernel@...r.kernel.org (open list),
        linux-mediatek@...ts.infradead.org (moderated list:ARM/Mediatek SoC
        support)
Subject: [PATCH] arm64: dts: mt8173: Fix cpu_thermal cooling-maps contributions

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(-)

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>;
 				};
 			};
 		};
-- 
2.11.0.390.gc69c2f50cf-goog