linux-kernel - Re: [PATCH 0/2] Disable SS instances in park mode for SC7180/ SC7280

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Date: Fri, 31 May 2024 16:41:41 +0200
From: Konrad Dybcio <konrad.dybcio@...aro.org>
To: Doug Anderson <dianders@...omium.org>,
 Krishna Kurapati PSSNV <quic_kriskura@...cinc.com>
Cc: cros-qcom-dts-watchers@...omium.org,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Rob Herring <robh@...nel.org>,
 Bjorn Andersson <andersson@...nel.org>, Conor Dooley <conor+dt@...nel.org>,
 Stephen Boyd <swboyd@...omium.org>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Matthias Kaehlcke <mka@...omium.org>, linux-kernel@...r.kernel.org,
 linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
 quic_ppratap@...cinc.com, quic_jackp@...cinc.com
Subject: Re: [PATCH 0/2] Disable SS instances in park mode for SC7180/ SC7280

On 31.05.2024 4:31 PM, Doug Anderson wrote:
> Hi,
> 
> On Fri, May 31, 2024 at 7:27 AM Krishna Kurapati PSSNV
> <quic_kriskura@...cinc.com> wrote:
>>
>>> My only guess is that somehow SC8280XP is faster and that changes the
>>> timing of how it handles interrupts. I guess you could try capping
>>> your cpufreq in sysfs and see if that makes a difference in
>>> reproducing. ;-) ...or maybe somehow SC8280XP has a newer version of
>>> the IP where they've fixed this?
>>>
>>> It would be interesting if someone with a SDM845 dragonboard could try
>>> replicating since that seems highly likely to reproduce, at least.
>>>
>>
>> Hi Konrad, Doug,
>>
>>   Usually on downstream we set this quirk only for all Gen-1 targets
>> (not particularly for this testcase) but to avoid these kind of
>> controller going dead issues. I can filter out the gen-1 targets (other
>> than sc7280/sc7180) and send a separate series to add this quirk in all
>> of them.
> 
> Sounds like a plan to me!

Yep!

In case there are more gen1 platforms than what we have upstream, it would
be of great utility if you could list them all, so that we can have a reference
for future additions, Krishna.

Konrad