Commit 97df3aa7 authored by Marc Zyngier's avatar Marc Zyngier Committed by Heiko Stuebner
Browse files

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: default avatarRobin Murphy <robin.murphy@arm.com>
Signed-off-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
Signed-off-by: default avatarHeiko Stuebner <heiko@sntech.de>
parent 9e98c678

arch/arm64/boot/dts/rockchip/rk3399.dtsi

+6 −0
Original line number Diff line number Diff line
@@ -71,6 +71,7 @@ 
			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 @@ 
			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 @@ 
			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 @@ 
			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 @@ 
			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 @@ 
			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>;

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