linux-kernel - Re: SATA DMA problem (sata

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Message-ID: <45841B20.9030402@pobox.com>
Date:	Sat, 16 Dec 2006 11:13:20 -0500
From:	Jeff Garzik <jgarzik@...ox.com>
To:	Alan <alan@...rguk.ukuu.org.uk>
CC:	David Shirley <tephra@...il.com>, linux-kernel@...r.kernel.org
Subject: Re: SATA DMA problem (sata_uli)

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@...hat.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



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