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| author | Caesar Wang <wxt@rock-chips.com> | 2017-07-25 12:22:55 +0300 |
|---|---|---|
| committer | Heiko Stuebner <heiko@sntech.de> | 2017-08-01 02:00:55 +0300 |
| commit | 45a995c054e116ea9578dd6186be35f65cc0a7d0 (patch) | |
| tree | 382ce02c4d247485cbed382c0e0ee53dab9fcd39 /arch/arm64/boot/dts/rockchip | |
| parent | fc982e0bc3d45650eafe4f5f8fc0bd76e48c679e (diff) | |
| download | linux-45a995c054e116ea9578dd6186be35f65cc0a7d0.tar.xz | |
arm64: dts: rockchip: update dynamic-power-coefficient for rk3399
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>
Diffstat (limited to 'arch/arm64/boot/dts/rockchip')
| -rw-r--r-- | arch/arm64/boot/dts/rockchip/rk3399.dtsi | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/arm64/boot/dts/rockchip/rk3399.dtsi b/arch/arm64/boot/dts/rockchip/rk3399.dtsi index ae42aee9031f..6473a0c12a7f 100644 --- a/arch/arm64/boot/dts/rockchip/rk3399.dtsi +++ b/arch/arm64/boot/dts/rockchip/rk3399.dtsi @@ -147,7 +147,7 @@ enable-method = "psci"; #cooling-cells = <2>; /* min followed by max */ clocks = <&cru ARMCLKB>; - dynamic-power-coefficient = <100>; + dynamic-power-coefficient = <436>; }; cpu_b1: cpu@101 { @@ -156,7 +156,7 @@ reg = <0x0 0x101>; enable-method = "psci"; clocks = <&cru ARMCLKB>; - dynamic-power-coefficient = <100>; + dynamic-power-coefficient = <436>; }; }; |