linux-kernel - Re: [PATCH v3 3/6] drm/msm/adreno: Add module param to disable ACD

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Message-ID: <7380a14d-4d96-42b7-97e0-9916717d62a0@quicinc.com>
Date: Tue, 7 Jan 2025 01:36:19 +0530
From: Akhil P Oommen <quic_akhilpo@...cinc.com>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
        Rob Clark
	<robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        Konrad Dybcio
	<konradybcio@...nel.org>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        "Dmitry
 Baryshkov" <dmitry.baryshkov@...aro.org>,
        Marijn Suijten
	<marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, "Simona
 Vetter" <simona@...ll.ch>,
        Viresh Kumar <vireshk@...nel.org>, Nishanth Menon
	<nm@...com>,
        Stephen Boyd <sboyd@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>
CC: <linux-arm-msm@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
        <freedreno@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
        <linux-pm@...r.kernel.org>, <devicetree@...r.kernel.org>
Subject: Re: [PATCH v3 3/6] drm/msm/adreno: Add module param to disable ACD

On 12/31/2024 4:02 PM, Konrad Dybcio wrote:
> On 30.12.2024 10:11 PM, Akhil P Oommen wrote:
>> Add a module param to disable ACD which will help to quickly rule it
>> out for any GPU issues.
>>
>> Signed-off-by: Akhil P Oommen <quic_akhilpo@...cinc.com>
>> ---
> 
> Is that something useful during internal development, or do we
> see ACD causing issues in the wild?
> 
> If the latter, would that be caused by e.g. outdated firmware?

It is rare to see ACD issues in production because there is pretty
stringent testing done during development. Still, disabling ACD is one
of the first thing we try because debugging HW spec violation is a
nightmare.

Regarding firmware, yeah, it is possible but rare in production.

-Akhil.

> 
> Konrad