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UPSTREAM: arm64: dts: rockchip: update dynamic-power-coefficient for rk3399

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This patch updates the dynamic-power-coefficient for big cluster on
rk3399 SoCs.

The dynamic power consumption of the CPU is proportional to the square of
the Voltage (V) and the clock frequency (f). The coefficient is used to
calculate the dynamic power as below -
Pdyn = dynamic-power-coefficient * V^2 * f
Where Voltage is in uV, frequency is in MHz.

As the following is the tested data on rk3399's big cluster.
frequency(MHz)  Voltage(V)  Current(mA) Dynamic-power-coefficient
24              0.8         15
48              0.8         23          ~417
96              0.8         40          ~443
216             0.8         82          ~438
312             0.8         115         ~430
408             0.8         150         ~455
So the dynamic-power-coefficient average value is about 436.

Signed-off-by: Caesar Wang <wxt@rock-chips.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Jianqun Xu <jay.xu@rock-chips.com>

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

Change-Id: I05a573eb7e0a74301f35fdeb2517f7fe3be9b8fb
This commit is contained in:
Caesar Wang
2017-07-25 17:22:55 +08:00
committed by Tao Huang
parent efaa77053d
commit bda0252702
1 changed files with 2 additions and 2 deletions
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4
arch/arm64/boot/dts/rockchip/rk3399.dtsi
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@@ -159,7 +159,7 @@
#cooling-cells = <2>; /* min followed by max */
clocks = <&cru ARMCLKB>;
cpu-idle-states = <&CPU_SLEEP &CLUSTER_SLEEP>;
dynamic-power-coefficient = <100>;
dynamic-power-coefficient = <436>;
};
cpu_b1: cpu@101 {
@@ -169,7 +169,7 @@
enable-method = "psci";
clocks = <&cru ARMCLKB>;
cpu-idle-states = <&CPU_SLEEP &CLUSTER_SLEEP>;
dynamic-power-coefficient = <100>;
dynamic-power-coefficient = <436>;
};
idle-states {