* [PATCH] arm64: dts: rockchip: update dynamic-power-coefficient for rk3399
@ 2017-07-25 9:22 Caesar Wang
2017-07-31 23:02 ` Heiko Stuebner
0 siblings, 1 reply; 2+ messages in thread
From: Caesar Wang @ 2017-07-25 9:22 UTC (permalink / raw)
To: Heiko Stuebner
Cc: linux-rockchip, Caesar Wang, Douglas Anderson, William wu,
Elaine Zhang, Kever Yang, Brian Norris, linux-kernel, Shawn Lin,
devicetree, Rob Herring, linux-arm-kernel, Will Deacon,
Mark Rutland, Catalin Marinas, Roger Chen
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>
---
arch/arm64/boot/dts/rockchip/rk3399.dtsi | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/arm64/boot/dts/rockchip/rk3399.dtsi b/arch/arm64/boot/dts/rockchip/rk3399.dtsi
index 9d02006..5d54a06 100644
--- a/arch/arm64/boot/dts/rockchip/rk3399.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk3399.dtsi
@@ -150,7 +150,7 @@
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 {
@@ -159,7 +159,7 @@
reg = <0x0 0x101>;
enable-method = "psci";
clocks = <&cru ARMCLKB>;
- dynamic-power-coefficient = <100>;
+ dynamic-power-coefficient = <436>;
};
};
--
2.7.4
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] arm64: dts: rockchip: update dynamic-power-coefficient for rk3399
2017-07-25 9:22 [PATCH] arm64: dts: rockchip: update dynamic-power-coefficient for rk3399 Caesar Wang
@ 2017-07-31 23:02 ` Heiko Stuebner
0 siblings, 0 replies; 2+ messages in thread
From: Heiko Stuebner @ 2017-07-31 23:02 UTC (permalink / raw)
To: Caesar Wang
Cc: linux-rockchip, Douglas Anderson, William wu, Elaine Zhang,
Kever Yang, Brian Norris, linux-kernel, Shawn Lin, devicetree,
Rob Herring, linux-arm-kernel, Will Deacon, Mark Rutland,
Catalin Marinas, Roger Chen
Am Dienstag, 25. Juli 2017, 17:22:55 CEST schrieb Caesar Wang:
> 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>
applied for 4.14 and thanks for that very nice and informative commit
message explaining the testing methodology.
Heiko
> ---
>
> arch/arm64/boot/dts/rockchip/rk3399.dtsi | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/arch/arm64/boot/dts/rockchip/rk3399.dtsi b/arch/arm64/boot/dts/rockchip/rk3399.dtsi
> index 9d02006..5d54a06 100644
> --- a/arch/arm64/boot/dts/rockchip/rk3399.dtsi
> +++ b/arch/arm64/boot/dts/rockchip/rk3399.dtsi
> @@ -150,7 +150,7 @@
> 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 {
> @@ -159,7 +159,7 @@
> reg = <0x0 0x101>;
> enable-method = "psci";
> clocks = <&cru ARMCLKB>;
> - dynamic-power-coefficient = <100>;
> + dynamic-power-coefficient = <436>;
> };
> };
>
>
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