linux-kernel - Re: [PATCH 1/5] ide: remove PIO "downgrade" quirk

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Date:	Mon, 18 Feb 2008 18:02:36 +0100
From:	"Bartlomiej Zolnierkiewicz" <bzolnier@...il.com>
To:	"Sergei Shtylyov" <sshtylyov@...mvista.com>
Cc:	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/5] ide: remove PIO "downgrade" quirk

Hi Sergei,

On Feb 18, 2008 5:06 PM, Sergei Shtylyov <sshtylyov@...mvista.com> wrote:
> Bartlomiej Zolnierkiewicz wrote:
>
> > No need for it nowadays
>
>     Since which moment, could you elaborate

We fixed:

- PIO auto-tuning in core code

- PIO programming in host drivers

- IORDY handling in core code and in host drivers (it could be that the
  incorrect IORDY handling was the main reason behind the "downgrade")

and

- lack of corresponding "quirk" in libata hasn't been problematic so far

so IMO there is no longer a valid reason to punish PIO performance
and the said "quirk" should be removed (in 2.6.26 after long time in -mm).

> > so remove quirk code from ide_get_best_pio_mode()
> > and IDE_HFLAG_PIO_DOWNGRADE host flag.
>
> > Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
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