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

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Date:   Mon, 25 Sep 2017 12:27:44 +0200
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Icenowy Zheng <icenowy@...c.io>
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

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.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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