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

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Date:   Thu, 9 Feb 2023 13:08:55 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
        Amit Pundir <amit.pundir@...aro.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc:     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 9.02.2023 12:03, Bryan O'Donoghue 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 ?
If the bootloader splash is enabled then this memory is used until the
DPU driver instructs MDP5 pipes to suck data from a newly assigned address,
so there's a short window where it is.

Konrad
> 
> ---
> bod