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

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Date:	Mon, 11 Jun 2007 11:37:26 +0200
From:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Tejun Heo <htejun@...il.com>
Subject: Re: [PATCH] pata_it821x: (partially) fix DMA in RAID mode

On Monday 11 June 2007, Jeff Garzik wrote:
> 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 Šimo 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).
> > 
> > Cc: Alan Cox <alan@...rguk.ukuu.org.uk>
> > Cc: Tejun Heo <htejun@...il.com>
> > Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
> > ---
> > 
> >  drivers/ata/pata_it821x.c |   11 +++--------
> >  1 file changed, 3 insertions(+), 8 deletions(-)
> 
> Patch is OK but it's mangled by your mailer:
> 
> @@ -79,7 +80,7 @@
> =20
> =20
>   #define DRV_NAME "pata_it821x"
> =2D#define DRV_VERSION "0.3.6"
> +#define DRV_VERSION "0.3.7"
> =20
>   struct it821x_dev
>   {
> @@ -460,14 +461,8 @@ static unsigned int it821x_passthru_qc_i
> =20
> 
> =2D     int dma_enabled =3D 0;
>          int i;
> =20
> 
> etc.

Ah, non-ASCII char confused the mailer... resend.  Sorry for that.
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