From: Jeff Garzik <jgarzik@pobox.com>
To: Alan <alan@lxorguk.ukuu.org.uk>
Cc: David Shirley <tephra@gmail.com>, linux-kernel@vger.kernel.org
Subject: Re: SATA DMA problem (sata_uli)
Date: Sat, 16 Dec 2006 11:13:20 -0500 [thread overview]
Message-ID: <45841B20.9030402@pobox.com> (raw)
In-Reply-To: <20061213112004.59cb186c@localhost.localdomain>
Alan wrote:
>> I tracked it down to one of the drives being forced into PIO4 mode
>> rather than UDMA mode; dmesg bits:
>> ata4.00: ATA-7, max UDMA/133, 586072368 sectors: LBA48 NCQ (depth 0/32)
>> ata4.00: ata4: dev 0 multi count 16
>> ata4.00: simplex DMA is claimed by other device, disabling DMA
>
> Your ULi controller is reporting that it supports UDMA upon only one
> channel at a time. The kernel is honouring this information. The older
> ULi (was ALi) PATA devices report simplex but let you turn it off so see
> if the following does the trick. Test carefully as always with disk driver
> changes.
>
> (Jeff probably best to check the docs before merging this but I believe
> it is sane)
>
> Signed-off-by: Alan Cox <alan@redhat.com>
My Uli SATA docs do not appear to cover the bmdma registers :( Only the
PCI config registers.
But regardless, I think the better fix is to never set ATA_HOST_SIMPLEX
if ATA_FLAG_NO_LEGACY is set.
None of the SATA controllers I've ever encountered has been simplex.
Jeff
next prev parent reply other threads:[~2006-12-16 16:13 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-12-13 5:02 SATA DMA problem (sata_uli) David Shirley
2006-12-13 11:20 ` Alan
2006-12-16 16:13 ` Jeff Garzik [this message]
2006-12-20 0:32 ` Tejun Heo
2006-12-20 0:39 ` Jeff Garzik
2006-12-20 2:44 ` Tejun Heo
2006-12-27 13:44 ` Tejun Heo
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