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

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Message-ID: <68621b7a-0079-49ad-adf0-71d1fe24bcf0@quicinc.com>
Date: Fri, 31 May 2024 20:22:02 +0530
From: Krishna Kurapati PSSNV <quic_kriskura@...cinc.com>
To: Konrad Dybcio <konrad.dybcio@...aro.org>,
        Doug Anderson
	<dianders@...omium.org>
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 5/31/2024 8:11 PM, Konrad Dybcio wrote:
> 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.
> 

I am not sure if I can give out info on targets that are not on 
upstream. I will check internally if I can do that. Else we can just 
ensure that from now on whenever a Gen-1 target is getting upstreamed, 
this quirk is set.

Regards,
Krishna,