linux-kernel - Re: [PATCH] arm64: dts: qcom: x1e: bus is 40-bits (fix 64GB models)

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Message-ID: <79b3e8ae-134c-df6d-396d-9b7f766ef666@marek.ca>
Date: Fri, 16 Jan 2026 17:53:59 -0500
From: Jonathan Marek <jonathan@...ek.ca>
To: Bjorn Andersson <andersson@...nel.org>, linux-arm-msm@...r.kernel.org
Cc: Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Sibi Sankar <sibi.sankar@....qualcomm.com>,
 Rajendra Nayak <quic_rjendra@...cinc.com>, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, Abel Vesa <abelvesa@...nel.org>
Subject: Re: [PATCH] arm64: dts: qcom: x1e: bus is 40-bits (fix 64GB models)

It turns out this change will make things worse for the (unfortunately 
common) EL1+64GB+brokenfirmware case.

Because of that I think the Fixes: tag and "(fix 64GB models)" should be 
dropped from the commit message. (I can also send a v2 with extra info 
in the commit message if needed)

On 1/16/26 4:39 PM, Bjorn Andersson wrote:
> 
> On Thu, 27 Nov 2025 16:29:42 -0500, Jonathan Marek wrote:
>> Unlike the phone SoCs this was copied from, x1e has a 40-bit physical bus.
>> The upper address space is used to support more than 32GB of memory.
>>
>> This fixes issues when DMA buffers are allocated outside the 36-bit range.
>>
>>
> 
> Applied, thanks!
> 
> [1/1] arm64: dts: qcom: x1e: bus is 40-bits (fix 64GB models)
>        commit: b38dd256e11a4c8bd5a893e11fc42d493939c907
> 
> Best regards,
>