linux-kernel - Re: [PATCH] pata_it821x: (partially) fix DMA in RAID mode

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Message-ID: <4679BEC2.5040007@garzik.org>
Date:	Wed, 20 Jun 2007 19:56:50 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
CC:	Alan Cox <alan@...rguk.ukuu.org.uk>, Tejun Heo <htejun@...il.com>,
	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] pata_it821x: (partially) fix DMA in RAID mode

Bartlomiej Zolnierkiewicz wrote:
> Code intended to check DMA status was checking DMA command register.
> 
> Moreover firmware seems to "forget" to set DMA capable bit for the
> slave device (at least in RAID mode but without ITE RAID volumes) so
> check device ID for DMA capable bit when deciding whether to use DMA
> and remove DMA status check completely.
> 
> Thanks to Pavol Simo for the bugreport and testing the initial fix.
> 
> This change unfortunately still doesn't fix DMA in RAID mode (which
> works fine with IDE it821x) but Alan is working on the missing pieces
> (pata_it821x vs libata EH issues).
> 
> Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
> Acked-by: Alan Cox <alan@...hat.com>
> Cc: Tejun Heo <htejun@...il.com>
> ---
> removed non-ASCII char from the patch description + added Alan's ACK
> 
>  drivers/ata/pata_it821x.c |   11 +++--------
>  1 file changed, 3 insertions(+), 8 deletions(-)

applied


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