linux-kernel - Re: [BISECTED] pata_jmicron: no drives found on post 2.6.25 kernels

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Date:	Wed, 21 May 2008 18:30:42 -0700
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Shaohua Li <shaohua.li@...el.com>
Cc:	Luca Tettamanti <kronos.it@...il.com>,
	Plamen Petrov <pvp-lsts@...ru.acad.bg>,
	linux-kernel@...r.kernel.org
Subject: Re: [BISECTED] pata_jmicron: no drives found on post 2.6.25 kernels

On Wednesday, May 21, 2008 6:15 pm Shaohua Li wrote:
> On Wed, 2008-05-21 at 21:45 +0200, Luca Tettamanti wrote:
> > On Wed, May 21, 2008 at 10:58 AM, Shaohua Li <shaohua.li@...el.com> wrote:
> > > On Tue, 2008-05-20 at 19:09 +0300, Plamen Petrov wrote:
> > >> Shaohua Li написа:
> > >> > On Tue, 2008-05-20 at 01:37 +0300, Plamen Petrov wrote:
> > >> >> Hello, folks!
> > >> >>
> > >> >> After 2.6.26 merge window opened, the optical drives in my
> > >> >> computer, hanging off a JMicron controler were not detected
> > >> >> by linux any more.
> > >> >>
> > >> >> Luca Tettamanti reported similar troubles:
> > >> >> http://marc.info/?l=linux-kernel&m=120958791323911&w=2
> > >> >>
> > >> >> Its been 20 days, so I decided to bisect.
> > >> >> git bisect revealed that commit
> > >> >> 7d715a6c1ae5785d00fb9a876b5abdfc43abc44b
> > >> >> is the one causing pata_jmicron to fail to detect drives,
> > >> >> connected to the JMicron controler on my motherboard.
> > >> >> At least in my case, anyway...
> > >> >> Changing kernel config to CONFIG_PCIEASPM=n makes the drives
> > >> >> attached to the JMicron SATA/PATA controller usable again.
> > >> >
> > >> > When you enable this option, did you change any ASPM policy? By
> > >> > default, we are using the BIOS setting, so it shouldn't change any
> > >> > thing.
> > >>
> > >> No, I did not change any ASPM policy, mainly because I do not how.
> > >>
> > >> > Also can you please send me the 'lspci -vvvxxxx' output with/without
> > >> > the ASPM enabled?
> > >
> > > Can you please try below patch?
> >
> > I confirm that the patch fixes the issue when CONFIG_ASPM is enabled.
> >
> > > The Slot 03:00.* of JMicron controller has two functions, but one is
> > > PCIE endpoint the other isn't PCIE device, very strange.
> >
> > Right, that's what I'm seeing here (motherboard is an ASUS P5B-E). I'm
> > attaching the output of lspci.
>
> Jesse, can you take this patch. It should be safe for 2.6.26.

Definitely.  Thanks Shaohua.

Jesse
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