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

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Message-ID: <Z9HjMyjzE9XlqrEj@x1>
Date: Wed, 12 Mar 2025 15:40:35 -0400
From: Brian Masney <bmasney@...hat.com>
To: Christopher Obbard <christopher.obbard@...aro.org>
Cc: Krzysztof Kozlowski <krzk@...nel.org>,
	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 Christopher,

On Wed, Mar 12, 2025 at 12:10:56PM +0100, Christopher Obbard wrote:
> 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.

>From a Fedora and centos-stream-9/10 perspective, we have dracut
updated so that the interconnect modules are included in the initramfs
by default.

https://github.com/dracutdevs/dracut/blob/master/modules.d/90kernel-modules/module-setup.sh#L74

Let me know if you are seeing a specific issue with the initramfs on
Fedora and I can help you.

We also configured all of the QC pinctrl drivers to be modules in
Fedora, and this causes a large number of probe deferrals on boot up.
One of the boots I measured was about a half second:

https://lore.kernel.org/linux-embedded/Z6J3WpeJKIKENC81@x13s/

Everything eventually loads and works as expected though. The upstream
defconfig configures most of the pinctrl drivers to be built in for
Qualcomm.

Brian