linux-kernel - Re: ata_piix, laptop cdrom, ICH7: EH, limiting speed to PIO

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Message-ID: <ac0be4d70709170505l6c4bba29pc8ad1c92fcb16ae9@mail.gmail.com>
Date:	Mon, 17 Sep 2007 16:05:00 +0400
From:	"Sergey Dolgov" <dolgovs@...il.com>
To:	"Tejun Heo" <htejun@...il.com>
Cc:	"Michal Piotrowski" <michal.k.k.piotrowski@...il.com>,
	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org
Subject: Re: ata_piix, laptop cdrom, ICH7: EH, limiting speed to PIO

On 9/17/07, Tejun Heo <htejun@...il.com> wrote:

[...]
> >>>> BTW, this only happens when using libata of course. The
> >>>> old CONFIG_IDE stuff works fine every time.
> >>> This maybe one of libata weirdness (I really don't get it why some hardware
> >>> works perfectly fine with an old IDE and don't work well with libata).
> >> Hmmm... Is MWDMA2 mode used with ide driver too?
> >>
> >
> > What's the best way to tell whether it does or not? (the log says
> > "selected mode 0x22", see below)
>
> Yes, that's MWDMA2.  Hmm... We're seeing many cases where MWDMA doesn't
> work with libata while it works fine with IDE but have no idea what's
> going on yet.  :-(
>

Okay, thanks. Please feel free to contact me if you need any more testing done.

-- 
Sergey
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