From e4dcb4ab3b24150d99c9d94123d99f76095f1e3c Mon Sep 17 00:00:00 2001 From: Lukasz Luba Date: Thu, 20 Feb 2020 09:56:35 +0000 Subject: [PATCH] ARM: dts: exynos: Add dynamic-power-coefficient to Exynos5422 CPUs To use Energy Aware Scheduler (EAS) the Energy Model (EM) should be registered for CPUs. Add dynamic-power-coefficient into CPU nodes which let CPUFreq subsystem register the EM structures. This will increase energy efficiency of big.LITTLE platforms. The 'dynamic-power-coefficient' values have been obtained experimenting with different workloads. The power measurements taken from big CPU Cluster and LITTLE CPU Cluster has been compared with official documents and synthetic workloads estimations. The effective power ratio between Cortex-A7 and Cortex-A15 CPUs (~3x) is also aligned with documentation. Signed-off-by: Lukasz Luba Signed-off-by: Krzysztof Kozlowski --- arch/arm/boot/dts/exynos5422-cpus.dtsi | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/arch/arm/boot/dts/exynos5422-cpus.dtsi b/arch/arm/boot/dts/exynos5422-cpus.dtsi index 1b8605c..4b641b9 100644 --- a/arch/arm/boot/dts/exynos5422-cpus.dtsi +++ b/arch/arm/boot/dts/exynos5422-cpus.dtsi @@ -31,6 +31,7 @@ operating-points-v2 = <&cluster_a7_opp_table>; #cooling-cells = <2>; /* min followed by max */ capacity-dmips-mhz = <539>; + dynamic-power-coefficient = <90>; }; cpu1: cpu@101 { @@ -43,6 +44,7 @@ operating-points-v2 = <&cluster_a7_opp_table>; #cooling-cells = <2>; /* min followed by max */ capacity-dmips-mhz = <539>; + dynamic-power-coefficient = <90>; }; cpu2: cpu@102 { @@ -55,6 +57,7 @@ operating-points-v2 = <&cluster_a7_opp_table>; #cooling-cells = <2>; /* min followed by max */ capacity-dmips-mhz = <539>; + dynamic-power-coefficient = <90>; }; cpu3: cpu@103 { @@ -67,6 +70,7 @@ operating-points-v2 = <&cluster_a7_opp_table>; #cooling-cells = <2>; /* min followed by max */ capacity-dmips-mhz = <539>; + dynamic-power-coefficient = <90>; }; cpu4: cpu@0 { @@ -79,6 +83,7 @@ operating-points-v2 = <&cluster_a15_opp_table>; #cooling-cells = <2>; /* min followed by max */ capacity-dmips-mhz = <1024>; + dynamic-power-coefficient = <310>; }; cpu5: cpu@1 { @@ -91,6 +96,7 @@ operating-points-v2 = <&cluster_a15_opp_table>; #cooling-cells = <2>; /* min followed by max */ capacity-dmips-mhz = <1024>; + dynamic-power-coefficient = <310>; }; cpu6: cpu@2 { @@ -103,6 +109,7 @@ operating-points-v2 = <&cluster_a15_opp_table>; #cooling-cells = <2>; /* min followed by max */ capacity-dmips-mhz = <1024>; + dynamic-power-coefficient = <310>; }; cpu7: cpu@3 { @@ -115,6 +122,7 @@ operating-points-v2 = <&cluster_a15_opp_table>; #cooling-cells = <2>; /* min followed by max */ capacity-dmips-mhz = <1024>; + dynamic-power-coefficient = <310>; }; }; }; -- 2.7.4