Date: Tue, 22 Jul 2008 19:10:22 +0100
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Ondrej Zary <linux@rainbow-software.org>
Cc: Alan Cox <alan@redhat.com>, LKML <linux-kernel@vger.kernel.org>,
       linux-ide@vger.kernel.org
Subject: Re: pata_it821x completely broken
Message-ID: <20080722191022.0417f45c@lxorguk.ukuu.org.uk>
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> New patch below, this time with DMA forced on RAID volumes - as my firmware
> does not identify the RAID arrays as DMA capable :(

The underlying problem is that the newer libata rewrites the dev->id data
in ways that we can't then patch up. I've actually been hacking on this a
bit today. The existing it821x code was working fine and it does the
needed patching, it just needs to do it in a different place, and that in
turn needs a new ap->ops->read_id() method so it can be hooked.

On the bright side that also allows us to implement a pata_mfm/rll
driver at last.

Alan

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