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

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Message-ID: <58cb370e0701120600pc65b237w4865c9637fc1b6e6@mail.gmail.com>
Date:	Fri, 12 Jan 2007 15:00:30 +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:
> On Fri, 12 Jan 2007 05:28:00 +0100
> Bartlomiej Zolnierkiewicz <bzolnier@...il.com> wrote:
>
> > [PATCH] ide: add ide_use_fast_pio() helper
> >
> > * add ide_use_fast_pio() helper for use by host drivers
> > * add DMA capability and autodma checks to ide_use_dma()
> >   - au1xxx-ide/it8213/it821x drivers didn't check for (id->capability & 1)
>
> For the IT8211/2 in SMART this check shouldn't be made.

It is OK since in it821x_fixups() we set it explicitly:

		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).

> >   - ide-cris driver didn't set ->autodma
>
> You've changed the behaviour there. Should the default be autodma=0 ?

Before my patch hwif->autodma was only checked in the chipset specific
hwif->ide_dma_check implementations.  For ide-cris it is
cris_dma_check()
function so there no behavior change here.

Sorry for not explaining changes in detail in the patch description
(I will update it).

Bart
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