linux-kernel - Re: [PATCH] drm/msm/devfreq: Restrict idle clamping to a618 for now

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Date:   Mon, 18 Oct 2021 18:33:36 +0100
From:   Caleb Connolly <caleb.connolly@...aro.org>
To:     John Stultz <john.stultz@...aro.org>,
        Rob Clark <robdclark@...il.com>
Cc:     dri-devel <dri-devel@...ts.freedesktop.org>,
        "open list:DRM DRIVER FOR MSM ADRENO GPU" 
        <freedreno@...ts.freedesktop.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Rob Clark <robdclark@...omium.org>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Jordan Crouse <jordan@...micpenguin.net>,
        Akhil P Oommen <akhilpo@...eaurora.org>,
        Jonathan Marek <jonathan@...ek.ca>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>,
        Sharat Masetty <smasetty@...eaurora.org>,
        Douglas Anderson <dianders@...omium.org>,
        open list <linux-kernel@...r.kernel.org>,
        Amit Pundir <amit.pundir@...aro.org>
Subject: Re: [PATCH] drm/msm/devfreq: Restrict idle clamping to a618 for now

Hi all,

On 18/10/2021 17:42, John Stultz wrote:
> On Mon, Oct 18, 2021 at 8:31 AM Rob Clark <robdclark@...il.com> wrote:
>>
>> From: Rob Clark <robdclark@...omium.org>
>>
>> Until we better understand the stability issues caused by frequent
>> frequency changes, lets limit them to a618.
>>
>> Signed-off-by: Rob Clark <robdclark@...omium.org>
>> ---
>> Caleb/John, I think this should help as a workaround for the power
>> instability issues on a630.. could you give it a try?
> 
> While I hit it fairly often, I can't reliably reproduce the crash, but
> in limited testing this seems ok to me.
> I've not hit the crash so far, nor seen any other negative side
> effects over 5.14.
> 
> So for what that's worth:
> Tested-by: John Stultz <john.stultz@...aro.org>
> 
> Caleb has better luck tripping this issue right away, so they can
> hopefully provide a more assured response.
This prevents the crash on the OnePlus 6 as the frequency can no longer go to zero.

I would like to find a better solution that still allows proper idling on a630, but that can wait for 5.16.

Tested-by: Caleb Connolly <caleb.connolly@...aro.org>
> 
> thanks
> -john
> 

-- 
Kind Regards,
Caleb (they/them)