Re: [PATCH 0/3] Simple DVFS support for Allwinner A64 SoC

[icenowy]

å 2017-09-25 18:27ïMaxime Ripard åéï
> On Mon, Sep 25, 2017 at 10:12:09AM +0000, Icenowy Zheng wrote:
> > ä 2017å9æ25æ GMT+08:00 äå6:10:27, Maxime Ripard 
> > <maxime.ripard@xxxxxxxxxxxxxxxxxx> åå:
> > >Hi,
> > >
> > >On Sat, Sep 23, 2017 at 12:15:28AM +0000, Icenowy Zheng wrote:
> > >> This patchset imports simple DVFS support for Allwinner A64 SoC.
> > >>
> > >> As the thermal sensor driver is not yet implemented and some boards
> > >> have still no AXP PMIC support, now only two OPPs are present --
> > >> 648MHz@xxxxx and 816MHz@xxxx to prevent overheat or undervoltage.
> > >>
> > >> PATCH 1 is a fix to the CCU driver of A64, and the remaining patches
> > >> set up the device tree bits of the DVFS on Pine64.
> > >
> > >How has this been tested?
> > >
> > >What tasks did you run, with what governor, etc...
> >
> > I only tested manual frequency switching between 648MHz and
> > 816MHz, and tested the PLL stuck issue by change the OPPs to
> > some random value.
>
> Ideally, we should test that it's actually reliable. Poorly chosen
> OPPs might lead to corrupt data that you might not get before a while.
>
> Please test using:
> https://linux-sunxi.org/Hardware_Reliability_Tests#Reliability_of_cpufreq_voltage.2Ffrequency_settings
>
> And post the report.

```
root@p64 [ cpuburn-arm@master ] # ./cpuburn-a53 &
[1] 2543
root@p64 [ cpuburn-arm@master ] # ./cpufreq-ljt-stress-test
Creating './whitenoise-1920x1080.jpg' ... done
CPU stress test, which is doing JPEG decoding by libjpeg-turbo
at different cpufreq operating points.

Testing CPU 0
  816 MHz ............................................................ 
OK
  648 MHz ............................................................ 
OK

Testing CPU 1
  816 MHz ............................................................ 
OK
  648 MHz ............................................................ 
OK

Testing CPU 2
  816 MHz ............................................................ 
OK
  648 MHz ............................................................ 
OK

Testing CPU 3
  816 MHz ............................................................ 
OK
  648 MHz ............................................................ 
OK

Overall result : PASSED
```

> Maxime