From 97df3aa76b4a384e29668f374a8b1034a31aa215 Mon Sep 17 00:00:00 2001 From: Marc Zyngier Date: Sat, 2 Mar 2019 13:10:30 +0000 Subject: [PATCH] arm64: dts: rockchip: Add capacity-dmips-mhz attributes to rk3399 The RK3399 has the interesting property to be a so called "big-little" system, where not all the CPUs are equal (the A53s are much weaker than the A72s). So far, we're not telling the OS that there is such a difference in processing capacity, and Linux assumes that they are equal. Too bad. Let's tell the OS about this by using the capacity-dmips-mhz property. The values used here are those used on the Juno platform, which is quite similar. This leads to the scheduler knowing that it can pack more tasks on the A72s, and leads to a better interactive experience. Tested-by: Robin Murphy Signed-off-by: Marc Zyngier Signed-off-by: Heiko Stuebner --- arch/arm64/boot/dts/rockchip/rk3399.dtsi | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/arm64/boot/dts/rockchip/rk3399.dtsi b/arch/arm64/boot/dts/rockchip/rk3399.dtsi index db9d948c0b03..0301e3e01b38 100644 --- a/arch/arm64/boot/dts/rockchip/rk3399.dtsi +++ b/arch/arm64/boot/dts/rockchip/rk3399.dtsi @@ -71,6 +71,7 @@ cpu_l0: cpu@0 { compatible = "arm,cortex-a53"; reg = <0x0 0x0>; enable-method = "psci"; + capacity-dmips-mhz = <485>; clocks = <&cru ARMCLKL>; #cooling-cells = <2>; /* min followed by max */ dynamic-power-coefficient = <100>; @@ -82,6 +83,7 @@ cpu_l1: cpu@1 { compatible = "arm,cortex-a53"; reg = <0x0 0x1>; enable-method = "psci"; + capacity-dmips-mhz = <485>; clocks = <&cru ARMCLKL>; #cooling-cells = <2>; /* min followed by max */ dynamic-power-coefficient = <100>; @@ -93,6 +95,7 @@ cpu_l2: cpu@2 { compatible = "arm,cortex-a53"; reg = <0x0 0x2>; enable-method = "psci"; + capacity-dmips-mhz = <485>; clocks = <&cru ARMCLKL>; #cooling-cells = <2>; /* min followed by max */ dynamic-power-coefficient = <100>; @@ -104,6 +107,7 @@ cpu_l3: cpu@3 { compatible = "arm,cortex-a53"; reg = <0x0 0x3>; enable-method = "psci"; + capacity-dmips-mhz = <485>; clocks = <&cru ARMCLKL>; #cooling-cells = <2>; /* min followed by max */ dynamic-power-coefficient = <100>; @@ -115,6 +119,7 @@ cpu_b0: cpu@100 { compatible = "arm,cortex-a72"; reg = <0x0 0x100>; enable-method = "psci"; + capacity-dmips-mhz = <1024>; clocks = <&cru ARMCLKB>; #cooling-cells = <2>; /* min followed by max */ dynamic-power-coefficient = <436>; @@ -126,6 +131,7 @@ cpu_b1: cpu@101 { compatible = "arm,cortex-a72"; reg = <0x0 0x101>; enable-method = "psci"; + capacity-dmips-mhz = <1024>; clocks = <&cru ARMCLKB>; #cooling-cells = <2>; /* min followed by max */ dynamic-power-coefficient = <436>; -- 2.45.2