linux-kernel - Re: [PATCH 18/19] ide: add ide_use_fast

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Date:	Fri, 12 Jan 2007 15:43:51 +0100
From:	"Bartlomiej Zolnierkiewicz" <bzolnier@...il.com>
To:	Alan <alan@...rguk.ukuu.org.uk>
Cc:	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 18/19] ide: add ide_use_fast_pio() helper

On 1/12/07, Alan <alan@...rguk.ukuu.org.uk> wrote:
> >               if(strstr(id->model, "Integrated Technology Express")) {
> >                       /* In raid mode the ident block is slightly buggy
> >                          We need to set the bits so that the IDE layer knows
> >                          LBA28. LBA48 and DMA ar valid */
> >                       id->capability |= 3;            /* LBA28, DMA */
> >
> > and we are better off using generic helper if we can
> > (which may later allow us to use generic tuning code).
>
> IT8212 in smart mode has no tuning at all, the real modes are hidden by
> the controller. Some firmware versions don't seem to be like being fed
> set features commands either hence the total lack of tuning.

[ The discussed "ide: add ide_use_fast_pio() helper" patch doesn't fix it
  but it doesn't break anything either (it doesn't change the current
behavior). ]

It seems that it821x_tune_chipset() is buggy since it sends SET FEATURES
command even when in smart mode.  Shouldn't there be "don't tune" flag
in it812x_fixups() to tell it821x_tune_chipset() to not send SET FEATURES
commands?

Bart
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