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

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Date:   Mon, 18 Oct 2021 09:42:36 -0700
From:   John Stultz <john.stultz@...aro.org>
To:     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>,
        Caleb Connolly <caleb.connolly@...aro.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

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.

thanks
-john