Re: [PATCH] ARM: dts: rockchip: Add dynamic-power-coefficient for rk3288

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Am Freitag, 12. April 2019, 02:01:58 CEST schrieb Matthias Kaehlcke:
> The value was determined with the following method:
> 
> - take CPUs 1-3 offline
> - for each OPP
>   - set cpufreq min and max freq to OPP freq
>   - start dhrystone benchmark
>   - measure CPU power consumption during 10s
>   - calculate Cx for OPPx
>     - Cx = (Px - P1) / (Vx²fx - V1²f1)          [1]
>       using the following units: mW / Ghz / V   [2]
> - C = avg(C2, ..., Cn)
> 
> [1] see commit 4daa001a1773 ("arm64: dts: juno: Add cpu
>      dynamic-power-coefficient information")
> [2] https://patchwork.kernel.org/patch/10493615/#22158551
> 
> FTR, these are the values for the different OPPs:
> 
> freq (kHz)   	mV		Px (mW)		Cx
> 
> 126000		900		39
> 216000		900		66		370
> 312000		900		95		372
> 408000		900		122		363
> 600000		900		177		359
> 696000		950		230		363
> 816000		1000		297		361
> 1008000		1050		404		362
> 1200000		1100		528		362
> 1416000		1200		770		377
> 1512000		1300		984		385
> 1608000		1350		1156		394
> 
> Signed-off-by: Matthias Kaehlcke <mka@xxxxxxxxxxxx>

I've applied this for 5.2 but moved the new entries
below the clock properties for some more alphabetic ordering.


Heiko





[Index of Archives]     [Device Tree Compilter]     [Device Tree Spec]     [Linux Driver Backports]     [Video for Linux]     [Linux USB Devel]     [Linux PCI Devel]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [XFree86]     [Yosemite Backpacking]


  Powered by Linux