linux-kernel - Re: [REGRESSION][BISECTED] 5.15-rc1: Broken AHCI on NVIDIA ION (MCP79)

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Message-ID: <87ee8yquyi.wl-maz@kernel.org>
Date:   Wed, 06 Oct 2021 12:00:21 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     Rui Salvaterra <rsalvaterra@...il.com>
Cc:     tglx@...utronix.de, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [REGRESSION][BISECTED] 5.15-rc1: Broken AHCI on NVIDIA ION (MCP79)

Hi Rui,

On Wed, 06 Oct 2021 09:50:48 +0100,
Rui Salvaterra <rsalvaterra@...il.com> wrote:
> 
> Hi, Thomas,
> 
> I'm sorry for reporting this so late in the cycle, I wasn't expecting
> being the only one affected. :)
> "PCI/MSI: Use new mask/unmask functions" broke boot for my ION/Atom
> 330 system. Dmesg shows
> 
> failed to IDENTIFY (I/O error, err_mask=0x4)
> 
> and the system drops to an initramfs shell. Let me know if you need
> any additional info (DMI dump and/or .config, for example).

Could you please give more context for this error? I assume that this
is some ATA device probing, but this is unclear at best. A full dmesg
definitely help.

'lspci -vvnn' would also be useful to understand what the device wants
in terms of PCI configuration.

Thanks,

	M.

-- 
Without deviation from the norm, progress is not possible.