linux-kernel - Re: [PATCH] arm64: defconfig: Enable Qualcomm interconnects as built-in

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Message-ID: <CACr-zFCYWEFPO8yExp_8hOQdVtC9Zwu1ZOZNksSeyyS6Ht0e9A@mail.gmail.com>
Date: Wed, 12 Mar 2025 12:10:56 +0100
From: Christopher Obbard <christopher.obbard@...aro.org>
To: Krzysztof Kozlowski <krzk@...nel.org>
Cc: Dmitry Baryshkov <lumag@...nel.org>, Catalin Marinas <catalin.marinas@....com>, 
	Will Deacon <will@...nel.org>, Bjorn Andersson <andersson@...nel.org>, 
	Konrad Dybcio <konrad.dybcio@....qualcomm.com>, linux-arm-kernel@...ts.infradead.org, 
	linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH] arm64: defconfig: Enable Qualcomm interconnects as built-in

Hi Krzysztof,

On Wed, 12 Mar 2025 at 09:56, Krzysztof Kozlowski <krzk@...nel.org> wrote:
>
> On 11/03/2025 20:15, Christopher Obbard wrote:
> > Hi Dmitry,
> >
> > On Tue, 11 Mar 2025 at 19:58, Dmitry Baryshkov <lumag@...nel.org> wrote:
> >>
> >> On Tue, Mar 11, 2025 at 07:10:06PM +0100, Christopher Obbard wrote:
> >>> I sent this patch to start the discussion, some things I found:
> >>>
> >>> 1) Some interconnects are missing from arm defconfig. Should they be =y too ?
> >>
> >> No, unless those are required for the UART console.
> >
> > OK, that makes sense. FWIW the cryptic (to me, at least) commit log on
> > https://web.git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6eee808134ecf1c1093ff1ddfc056dc5e469d0c3
> > made me think that the interconnects should be built-in on all devices.
> >
> > Of course, the real problem here is RB3gen2 not actually finding the
> > UFS/eMMC device due to no interconnect driver.
> > Until now, I have been building that into the kernel. I will
> > investigate instead shoving into the initrd (in both debian and
> > fedora) which should solve my issue and render this patchset useless.
>
> For Qualcomm platforms you are expected to always have initramfs, thus
> you will have the modules for UFS/eMMC mounts. I don't understand the
> problem which you were trying to solve.
>
> The interconnects were built in *only* because of need for serial
> console. Only.

Thanks for confirming. It is all clear now.

Consider this patch dropped from my side.

For reference, I am working on updating initramfs generation tools in
Debian/Fedora to include the required interconnect modules. Currently
the interconnect drivers are built as modules in these distros, but
are not included in the initrd. That is where my confusion initially
stemmed from.

Thanks,

Chris