Bug#1035587: linux: broken AHCI controller on MIPS Loongson 3 (regression from 5.10.162-1)

[Huacai Chen <chenhuacai@kernel.org>]

On Sun, Jun 18, 2023 at 5:24 PM Aurelien Jarno <aurel32@debian.org> wrote:
>
> Hi,
>
> On 2023-05-07 19:22, Jiaxun Yang wrote:
> >
> >
> > > 2023年5月6日 01:58，YunQiang Su <wzssyqa@gmail.com> 写道：
> > >
> > > Aurelien Jarno <aurel32@debian.org> 于2023年5月6日周六 04:30写道：
> > >>
> > >> Source: linux
> > >> Version: 5.10.178-3
> > >> Severity: important
> > >> X-Debbugs-Cc: dsa@debian.org, debian-mips@lists.debian.org, syq@debian.org
> > >>
> > >> Following the point release, the buildd mipsel-osuosl-03.d.o does not
> > >> boot anymore, with errors in the AHCI controller:
> > >>
> > >> [   35.912147] ata4.00: exception Emask 0x0 SAct 0x20000000 SErr 0x0 action 0x6 frozen
> > >> [   35.919769] ata4.00: failed command: WRITE FPDMA QUEUED
> > >> [   35.924968] ata4.00: cmd 61/20:e8:00:f0:e1/00:00:00:00:00/40 tag 29 ncq dma 16384 out
> > >> [   35.924968]          res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
> > >> [   35.940097] ata4.00: status: { DRDY }
> > >> [   35.943743] ata4: hard resetting link
> > >>
> > >> While that initially looks like a hardware issue, it appears that
> > >> reverting the kernel to 5.10.162-1 (from 5.10.178-3) fixes the issue.
> > >> Strangely mipsel.osuosl-05.d.o, which seems to be similar hardware (CPU,
> > >> motherboard and SATA drive), does not exhibit the same issue.
> > >>
> > >
> > > Maybe the different firmwares are used for them...
> > > CCed Huacai and Jiaxun.
> >
> > I’m unable to reproduce on my side. Perhaps different hardware.
> > Is it possible to bisect Kernel on that machine to see of reverting that two commits do help?
>
> I have bisected the issue and I confirm the intuition from Cyril. The
> first bad commit is 654ae539254d10042869fdc77ad04c09e7eff1fd. Reverting
> both commits (they are linked) indeed fixes the issue.
Seems a firmware bug, latest firmware should configure a suitable MRRS.

Huacai
>
> Aurelien
>
> --
> Aurelien Jarno                          GPG: 4096R/1DDD8C9B
> aurelien@aurel32.net                     http://aurel32.net