| Message ID | 20170113023006.150845-1-djkurtz@chromium.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
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@chromium.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>; > }; > }; > }; >
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>; }; }; };
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@chromium.org> --- arch/arm64/boot/dts/mediatek/mt8173.dtsi | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)