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

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Message-ID: <20070515123132.2e596d69@the-village.bc.nu>
Date:	Tue, 15 May 2007 12:31:32 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Thomas Kuther <gimpel@...nenkinder.org>
Cc:	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org
Subject: Re: IT821x: no DMA since 2.6.21

On Tue, 15 May 2007 12:53:08 +0200
Thomas Kuther <gimpel@...nenkinder.org> wrote:

> Hi!
> 
> Since 2.6.21 I have a problem with the it821x driver on my ITE 8212
> controller.
> Now I saw some updates to it821x in 2.6.22-rc1 and gave that a try, but
> the problem persists.

I've had multiple reports of this. I would recommend you use the libata
driver. IT821x hasn't changed over the past few releases so its someting
in the core IDE code that broke it [note it might not of course be that
the problem is in the core code..].

I have no plans at this point to debug the old IT821x driver due to time
constraints, and if anyone wants to have a crack at debugging this and
fixing it go for it.

BTW: I also note you have the controller in smart mode but are not using
the hardware raid functions. In that situation it generally runs faster
(and does CD-ROM) if you flash the ATAPI firmware to the controller or
boot with the noraid option "it8212.noraid=1"

Alan
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