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

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Message-ID: <ycygvgw4uwm6bb7i4fbuxmzb5a42zmn6atwwdznicvili3jh2h@eaa4ddtkwc5z>
Date: Fri, 16 Jan 2026 17:19:26 -0600
From: Bjorn Andersson <andersson@...nel.org>
To: Jonathan Marek <jonathan@...ek.ca>
Cc: linux-arm-msm@...r.kernel.org, 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)

On Fri, Jan 16, 2026 at 05:53:59PM -0500, Jonathan Marek wrote:
> 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)
> 

It seems to me that neither of these to actions will affect the impact
of the patch. What does "make things worse" imply?

Are we better off dropping this patch?

Regards,
Bjorn

> 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,
> >