From: Jeff Garzik <jeff@garzik.org>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: linux-ide@vger.kernel.org
Subject: Re: 2.6.32: Promise UDMA33 card refuses to work in UDMA mode
Date: Mon, 04 Jan 2010 13:07:00 -0500 [thread overview]
Message-ID: <4B422E44.1080501@garzik.org> (raw)
In-Reply-To: <20100104173835.3c5d3ea5@lxorguk.ukuu.org.uk>
On 01/04/2010 12:38 PM, Alan Cox wrote:
>> Early SATA controllers are just PATA controllers in disguise. All SFF
>> controllers want that 400ns delay. The 400ns delay should -not- be avoided.
>
> Its a signalling protocol requirement for PATA or a PATA controller with
> a PATA/SATA bridge. What makes you think a SATA controller cares one
> iota ?
Because first gen SATA controllers, notably the Promise ones, were often
just the same old PATA silicon logic with additional PATA<->SATA
translation glue logic, rather than a pure SATA SFF implementation.
>> Because several SATA controllers are SFF and use the code in question,
>> the MMIO issue is relevant for the code change, even if it is irrelevant
>> to drivers/ata/pata_*.c.
>
> and to SATA. It's simply not relevant at a protocol level to SATA which
> is message passing anyway.
It is not relevant to FIS-based SATA (SiI 3124, AHCI), sure. But SFF is
not FIS-based SATA.
Jeff
next prev parent reply other threads:[~2010-01-04 18:07 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-12-24 18:13 2.6.32: Promise UDMA33 card refuses to work in UDMA mode Russell King
2009-12-24 21:54 ` Russell King
2010-01-03 0:23 ` Russell King
2010-01-03 3:08 ` Robert Hancock
2010-01-03 10:05 ` Russell King
2010-01-03 11:40 ` Alan Cox
2010-01-03 22:35 ` [PATCH] Fix Promise UDMA33 IDE driver (pdc202xx_old) Russell King
2010-01-04 19:14 ` Sergei Shtylyov
2010-01-05 6:26 ` David Miller
2010-01-05 17:49 ` Russell King
2010-01-05 17:52 ` Sergei Shtylyov
2010-01-03 23:46 ` 2.6.32: Promise UDMA33 card refuses to work in UDMA mode Russell King
2010-01-04 10:37 ` Alan Cox
2010-01-04 13:30 ` Russell King
2010-01-04 15:16 ` Alan Cox
2010-01-04 15:32 ` Jeff Garzik
2010-01-04 15:44 ` Russell King
2010-01-04 15:55 ` Alan Cox
2010-01-04 16:15 ` Russell King
2010-01-04 16:48 ` Jeff Garzik
2010-01-04 17:16 ` Sergei Shtylyov
2010-01-04 15:48 ` Alan Cox
2010-01-04 15:25 ` Jeff Garzik
2010-01-04 15:42 ` Russell King
2010-01-05 2:06 ` Robert Hancock
2010-01-05 11:25 ` Alan Cox
2010-01-05 13:00 ` Jeff Garzik
2010-01-05 13:37 ` Alan Cox
2010-01-05 13:11 ` Jeff Garzik
2010-01-04 15:46 ` Alan Cox
2010-01-04 16:32 ` Jeff Garzik
2010-01-04 17:02 ` Alan Cox
2010-01-04 17:27 ` Jeff Garzik
2010-01-04 17:30 ` Russell King
2010-01-04 18:03 ` Jeff Garzik
2010-01-04 18:06 ` Russell King
2010-01-04 18:35 ` Jeff Garzik
2010-01-04 17:38 ` Alan Cox
2010-01-04 18:07 ` Jeff Garzik [this message]
2010-01-04 18:29 ` Jeff Garzik
2010-01-04 16:31 ` Bartlomiej Zolnierkiewicz
2010-01-04 17:28 ` Russell King
2010-01-04 17:39 ` Alan Cox
2010-01-04 17:46 ` Russell King
2010-01-04 18:20 ` Alan Cox
2010-01-04 17:49 ` Bartlomiej Zolnierkiewicz
2010-01-05 1:03 ` Robert Hancock
2010-01-05 10:04 ` Jeff Garzik
2010-01-05 17:44 ` Russell King
2010-01-06 0:30 ` Robert Hancock
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