linux-kernel - Re: snd-cmipci oops during probe on arm64 (current mainline, pre-6.6-rc1)

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Message-ID: <ZPjoWr17SNFHLDPD@geday>
Date:   Wed, 6 Sep 2023 18:00:10 -0300
From:   Geraldo Nascimento <geraldogabriel@...il.com>
To:     Robin Murphy <robin.murphy@....com>
Cc:     Antonio Terceiro <antonio.terceiro@...aro.org>,
        Takashi Iwai <tiwai@...e.de>, Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: snd-cmipci oops during probe on arm64 (current mainline,
 pre-6.6-rc1)

On Wed, Sep 06, 2023 at 09:37:18PM +0100, Robin Murphy wrote:
> 
> Bit bigger than a Pi... ;)
>

Ohh, that's impressive indeed!

But looking around with Google, it turns out the Altra Ampere PCIe is
definitely quirky, see:

https://lore.kernel.org/linux-acpi/20200806225525.GA706347@bjorn-Precision-5520/T/
https://github.com/Tencent/TencentOS-kernel/commit/f454797b673c06c0eb1b77be20d8a475ad2fbf6f

The first quirk should probably be activated on Antonio's kernel but the
second one being a downstream Tencent patch, isn't. Alas, the second
quirk comes with a performance hit, see:

https://gitlab.freedesktop.org/drm/amd/-/issues/2078

Thanks,
Geraldo Nascimento