linux-kernel - Re: IT821x: no DMA since 2.6.21

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Message-ID: <20070516134021.0fefa16b@the-village.bc.nu>
Date:	Wed, 16 May 2007 13:40:21 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Cc:	Thomas Kuther <gimpel@...nenkinder.org>,
	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org
Subject: Re: IT821x: no DMA since 2.6.21

> The real problem seems to be that IT821x "virtual" ID misses info
> about supported DMA modes (while it seems to contain enabled DMA
> mode info).

It does at least for the RAID volumes which are quite peculiar and seem
to have been defined by flipping bits until Windows worked 8)


> [ Patch is based on the above theory and Alan's work on pata_it821x.
>   Sorry for no real description (TODO) but it's almost 3:00 am ... ]

Thanks for doing that. I've got a potential patch for libata and the
smart mode problem. Turns out that Tejun's sanity checks in the bus reset
path are too smart for the firmware ;)

Alan
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