linux-kernel - Re: [2.6.28-rc] Sata soft reset filling log

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Date:	Mon, 22 Dec 2008 16:14:09 +0900
From:	Tejun Heo <tj@...nel.org>
To:	Justin Madru <jdm64@...ab.com>
CC:	lkml <linux-kernel@...r.kernel.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-ide@...r.kernel.org, "Rafael J. Wysocki" <rjw@...k.pl>,
	Jeff Garzik <jeff@...zik.org>
Subject: Re: [2.6.28-rc] Sata soft reset filling log

Hello,

(cc'ing Mark)

Justin Madru wrote:
> Well, it's good to hear that you don't think my drive is failing (sure
> hope it's not failing!)

Yeap, it's your DVD drive.

> I posted the full dmesg in reply to Alan in
> http://lkml.org/lkml/2008/12/19/30.

Ah.. oops, missed the other messages.  Sorry.

> Also, more information about my computer can be found at:
> http://jdserver.homelinux.org/bugreports/
> If you need me to run anything else not found in the above links then
> let me know.

Ah.. strange.  The command protocol is ATAPI_PROT_NODATA and the drive
should be setting DRQ to receive CDB but it's not doing that.
Strange.  It could be that the drive is a little bit tardy with DRQ -
ie. setting DRQ after clearing BUSY and ata_piix is now successfully
hitting the small window for some reason.

Does the attached patch make any difference?

Thanks.

-- 
tejun

View attachment "DRQ-debug.patch" of type "text/x-patch" (633 bytes)