linux-kernel - Re: [PATCH] ide: Fix ata_id_has_dword_io to return DWORD I/O support properly

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Date:	Thu, 18 Dec 2008 22:40:10 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Cc:	Sergei Shtylyov <sshtylyov@...mvista.com>,
	Jeff Garzik <jeff@...zik.org>,
	Mario Schwalbe <schwalbe@....tu-dresden.de>,
	linux-kernel@...r.kernel.org,
	Linux IDE mailing list <linux-ide@...r.kernel.org>
Subject: Re: [PATCH] ide: Fix ata_id_has_dword_io to return DWORD I/O
 support properly

> OTOH the current patch is safe even for 2.6.28 (based on years of experience
> with the check that we had in IDE subsystem) and will fix some libata drivers
> (pata_legacy, pata_qdi and pata_winbond) to use dword IO on >= ATA-2 devices.
> 
> [ In reality this a regression fix for IDE -> libata conversion as it is a
>   huge performance improvement for the above mentioned DMA-less drivers. ]

The 32bit PIO support is already queued up and went to Jeff a while ago
so thats all in hand - its btw a big win on some suprising chipset cases
including Intel ICH chipsets.

> Jeff, I would like to merge it through IDE tree since the other patch depends
> on it but if you want to go ahead and push it to Linus earlier feel free to
> do it (or I can include it into the next IDE fixes pull request if you like).

Its still broken. You cannot use the version check for versions below 3.
I remain unconvinced we should be looking at it anywhere except specific
pure ISA cycle pass through hardware and thus it belongs as a helper for
those drivers not as ata_has_mumble stuff as its not ATA - eide_* maybe.

Doubly complicating it is the small detail that ATA1 devices don't
all respond to IDENTIFY in the first place....

Alan
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