From: Russell King <rmk+lkml@arm.linux.org.uk>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: linux-kernel@vger.kernel.org, bzolnier@gmail.com
Subject: Re: Parallel ATA with libata status with the patches I'm working on
Date: Fri, 4 Nov 2005 23:10:48 +0000 [thread overview]
Message-ID: <20051104231048.GD12026@flint.arm.linux.org.uk> (raw)
In-Reply-To: <1131111667.26925.31.camel@localhost.localdomain>
On Fri, Nov 04, 2005 at 01:41:06PM +0000, Alan Cox wrote:
> While writing the new sl82c05 driver I noticed a real nasty lurking in
> the old code. According to the errata docs you have to reset the DMA
> engine every transfer to work around chip errata. It also says that this
> resets any other ATA transfer in progress.
>
> If both channels are in use there is no locking between the channels to
> stop a reset on one channel as DMA begins making a mess of the other
> channel. Looks like serialize should be set on the driver ?
Possibly, though benh needs to comment. (I think benh has the only
hardware which has the possibility of both channels - the NetWinder
only has one channel with one disk.)
--
Russell King
Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/
maintainer of: 2.6 Serial core
next prev parent reply other threads:[~2005-11-04 23:10 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-11-03 14:54 Parallel ATA with libata status with the patches I'm working on Alan Cox
2005-11-03 14:48 ` Russell King
2005-11-03 15:02 ` Bartlomiej Zolnierkiewicz
2005-11-03 15:28 ` David S. Miller
2005-11-03 15:48 ` Bartlomiej Zolnierkiewicz
2005-11-03 16:27 ` Alan Cox
2005-11-03 15:56 ` Alan Cox
2005-11-03 20:55 ` Krzysztof Halasa
2005-11-03 21:29 ` Bartlomiej Zolnierkiewicz
2005-11-03 22:29 ` Krzysztof Halasa
2005-11-03 22:48 ` Bartlomiej Zolnierkiewicz
2005-11-03 22:54 ` Alan Cox
2005-11-04 1:30 ` Rogério Brito
2005-11-04 13:38 ` Alan Cox
2005-11-04 13:41 ` Alan Cox
2005-11-04 23:10 ` Russell King [this message]
2005-11-04 23:19 ` Benjamin Herrenschmidt
2005-11-03 15:58 ` Alan Cox
2005-11-03 15:30 ` Russell King
2005-11-03 16:23 ` Alan Cox
2005-11-04 3:35 ` Jeff Garzik
2005-11-04 3:35 ` Jeff Garzik
2005-11-04 8:43 ` Xavier Bestel
2005-11-03 14:58 ` Bartlomiej Zolnierkiewicz
2005-11-03 15:49 ` Alan Cox
2005-11-03 15:34 ` Bartlomiej Zolnierkiewicz
2005-11-04 0:14 ` Mark Lord
2005-11-04 0:17 ` Mark Lord
2005-11-04 1:18 ` Alan Cox
2005-11-04 3:49 ` Jeff Garzik
2005-11-05 22:31 ` Mark Lord
2005-11-04 6:43 ` Benjamin Herrenschmidt
2005-11-04 7:00 ` Jeff Garzik
2005-11-04 13:34 ` Alan Cox
2005-11-04 21:50 ` Benjamin Herrenschmidt
2005-11-06 20:41 ` Alan Cox
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