linux-kernel - Re: [PATCH 1/2] firmware: include drivers/firmware/Kconfig unconditionally

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Date:   Tue, 28 Sep 2021 12:58:56 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Arnd Bergmann <arnd@...db.de>,
        Liam Girdwood <lgirdwood@...il.com>,
        Charles Keepax <ckeepax@...nsource.cirrus.com>,
        Simon Trimmer <simont@...nsource.cirrus.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
        Helge Deller <deller@....de>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Linus Walleij <linus.walleij@...aro.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-ia64@...r.kernel.org, linux-mips@...r.kernel.org,
        linux-parisc@...r.kernel.org, linux-riscv@...ts.infradead.org
Subject: Re: [PATCH 1/2] firmware: include drivers/firmware/Kconfig
 unconditionally

On Tue, Sep 28, 2021 at 09:50:26AM +0200, Arnd Bergmann wrote:

> Compile-testing drivers that require access to a firmware layer
> fails when that firmware symbol is unavailable. This happened
> twice this week:

...

> We should probably do the same thing for other subsystems as well,
> but fix this one first as this is a dependency for other patches
> getting merged.

Reviwed-by: Mark Brown <broonie@...nel.org>

Regardless of what we do with the Cirrus DSP this just seems like a good
idea - surprises due to this not being generally available keep coming
up, IIRC with the i.MX firmware in the past for example.

> Not sure how we'd want to merge this patch, if two other things
> need it. I'd prefer to merge it along with the QCOM_SCM change
> through the soc tree, but that leaves the cirrus firmware broken
> unless we also merge it the same way (rather than through ASoC
> as it is now).

We could also merge a tag into both places.

> Alternatively, we can try to find a different home for the Cirrus
> firmware to decouple the two problems. I'd argue that it's actually
> misplaced here, as drivers/firmware is meant for kernel code that
> interfaces with system firmware, not for device drivers to load
> their own firmware blobs from user space.

Trying to enforce distinctions here feels like it's liable to lead to
trouble at some point...

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