linux-kernel - Re: [PATCH] arm64: dts: qcom: sdm845-db845c: Mark cont splash memory region as reserved

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Date:   Mon, 10 Apr 2023 14:24:07 +0530
From:   Amit Pundir <amit.pundir@...aro.org>
To:     "Bryan O'Donoghue" <bryan.odonoghue@...aro.org>
Cc:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Caleb Connolly <caleb.connolly@...aro.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        dt <devicetree@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] arm64: dts: qcom: sdm845-db845c: Mark cont splash memory
 region as reserved

On Thu, 9 Feb 2023 at 16:33, Bryan O'Donoghue
<bryan.odonoghue@...aro.org> wrote:
>
> On 09/02/2023 09:05, Amit Pundir wrote:
> > Hi, So what is the verdict on this patch?
> >
> > I submitted this fix to make sure UFS don't map and crash on it, which
> > I have seen happening occassionaly on db845c and Caleb reported
> > similar issues on his sdm845 device iirc. I should have probably put
> > that in my commit message as well.
> >
> > Regards,
> > Amit Pundir
>
> So the memory _is_ being used by ... continuous splash on an Android
> image, i.e. your Android ? limited to Android - image continues on with
> the splash but other blocks erroneously reuse the memory then, UFS as an
> example ?

Hi Bryan,

Yes UFS (reported only on v5.10) tries to map this reserved memory and
system crash and reboot. Plan is to backport this patch to v5.10.y.

Regards,
Amit Pundir

>
> ---
> bod