linux-kernel - Re: [PATCH v4] arm64: dts: meson: S922X: extend cpu opp-points

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Message-Id: <2A9D3FBA-917A-42C7-9757-4316D6B3D284@gmail.com>
Date:   Mon, 27 Apr 2020 13:19:09 +0400
From:   Christian Hewitt <christianshewitt@...il.com>
To:     Jerome Brunet <jbrunet@...libre.com>
Cc:     Tim Lewis <elatllat@...il.com>, mark.rutland@....com,
        devicetree@...r.kernel.org, joy.cho@...dkernel.com,
        narmstrong@...libre.com, khilman@...libre.com,
        linux-kernel@...r.kernel.org, robh+dt@...nel.org,
        tobetter@...il.com, linux-amlogic@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v4] arm64: dts: meson: S922X: extend cpu opp-points


> On 27 Apr 2020, at 1:06 pm, Jerome Brunet <jbrunet@...libre.com> wrote:
> 
> On Sun 26 Apr 2020 at 18:21, Tim Lewis <elatllat@...il.com> wrote:
> 
>> Add extra cpu pop points to allow mild overclock on S922X. The opp
>> points are found in Hardkernel N2 sources [1] and testing shows no
>> obvious issues on other S922X devices. Thermal throttling should
>> keep things in-check if needed.
> 
> The Odroid-N2 has a massive heatsink mounted.
> Do we have any idea if this applies (is safe) on any other S922x
> device ?

I’ve tested it on several S922X box devices that I have, and also the
original S922X version of the VIM3 - all have similar sized passive
heatsinks about 20% the size of the N2 one. No obvious issues with
Kodi software decoding to increase CPU usage. NB: The original patch
submission was N2 specific and then reworked to apply to all S922X
devices at Neil’s suggestion (after my TB and earlier comments).

CH.

[snip]