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

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Date:   Wed, 27 Sep 2017 19:51:30 +0800
From:   icenowy@...c.io
To:     Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:     Chen-Yu Tsai <wens@...e.org>, linux-arm-kernel@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-sunxi@...glegroups.com
Subject: Re: [PATCH 0/3] Simple DVFS support for Allwinner A64 SoC

在 2017-09-25 18:27，Maxime Ripard 写道：
> On Mon, Sep 25, 2017 at 10:12:09AM +0000, Icenowy Zheng wrote:
>> 于 2017年9月25日 GMT+08:00 下午6:10:27, Maxime Ripard 
>> <maxime.ripard@...e-electrons.com> 写到:
>> >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@...4V and 816MHz@...V 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@...ter ] # ./cpuburn-a53 &
[1] 2543
root@p64 [ cpuburn-arm@...ter ] # ./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