linux-kernel - Re: [PATCH 2/6] arm64: dts: qcom: sm6125-xiaomi-ginkgo: Correct reserved memory ranges

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Message-ID: <e0f33ac2-331f-4ab4-a960-6bd8bcac7306@oss.qualcomm.com>
Date: Fri, 16 Jan 2026 10:52:27 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: David Heidelberg <david@...t.cz>,
        Barnabás Czémán <barnabas.czeman@...nlining.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
 <conor+dt@...nel.org>,
        Gabriel Gonzales <semfault@...root.org>, Kees Cook <kees@...nel.org>,
        Tony Luck <tony.luck@...el.com>,
        "Guilherme G. Piccoli" <gpiccoli@...lia.com>,
        Biswapriyo Nath <nathbappai@...il.com>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org,
        phone-devel@...r.kernel.org, ~postmarketos/upstreaming@...ts.sr.ht,
        linux@...nlining.org
Subject: Re: [PATCH 2/6] arm64: dts: qcom: sm6125-xiaomi-ginkgo: Correct
 reserved memory ranges

On 1/14/26 10:55 PM, David Heidelberg wrote:
> On 14/01/2026 11:28, Konrad Dybcio wrote:
>> On 1/14/26 11:15 AM, David Heidelberg wrote:
>>> On 12/01/2026 21:13, BarnabÃ¡s CzÃ©mÃ¡n wrote:
>>>> The device was crashing on high memory load because the reserved memory
>>>> ranges was wrongly defined. Correct the ranges for avoid the crashes.
>>>> Change the ramoops memory range to match with the values from the recovery
>>>> to be able to get the results from the device.
>>>>
>>>> Fixes: 9b1a6c925c88 ("arm64: dts: qcom: sm6125: Initial support for xiaomi-ginkgo")
>>>> Signed-off-by: Barnabás Czémán <barnabas.czeman@...nlining.org>
>>>> ---
>>
>> [...]
>>
>>> Hello!
>>>
>>> I suggest one more nice to have improvement:
>>>
>>> you could label framebuffer cont_splash_mem since you already touching the node and testing the series.
>>>
>>> Then in additional commit, you can replace manually defined `reg` in chosen > framebuffer node with
>>>
>>> memory-region = <&cont_splash_mem>;
>>>
>>> For example you can look at sdm845-oneplus-common.dtsi
>>>
>>> Tell me what u think
>>
>> If you wanna do that, please call it framebuffer_mem, "cont_splash" is a
>> Qualcomm-specific name for (roughly) flicker-free bootup
> 
> I have feeling someone recommended me to stick with cont_splash_mem.
> 
> I think, since we'll be doing the mdss reset anyway in sdm845 (which I used as an example), I can do the rename in our sdm845 too then without any harm? (no it's not flicker-free takeover :D )

It's not flicker-free because the OS must cooperate in that process,
whereas we currently reset and re-initialize the entire display subsystem

Konrad