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Message-ID: <58cb370e0511180838x621d35c9w57df4551016cd52f@mail.gmail.com>
Date: Fri, 18 Nov 2005 17:38:50 +0100
From: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Subject: Re: [PATCH linux-2.6-block:post-2.6.15 09/10] blk: add FUA support to IDE
Cc: Tejun Heo <htejun@gmail.com>, axboe@suse.de, jgarzik@pobox.com,
       James.Bottomley@steeleye.com, linux-kernel@vger.kernel.org
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On 11/18/05, Alan Cox <alan@lxorguk.ukuu.org.uk> wrote:
> On Gwe, 2005-11-18 at 17:17 +0100, Bartlomiej Zolnierkiewicz wrote:
> > Probably it should work fine given that drive->mult_count is on.
> >
> > The only controller using drive->vdma in the current tree is cs5520
> > so you should confirm this with Mark Lord & Alan Cox.
>
> The CS5520 VDMA performs PIO commands with controller driven DMA to PIO
> of the data blocks. Thus it can do any PIO command with one data in or
> out phase as if it were DMA.

Therefore doing ATA_CMD_WRITE_MULTI_FUA_EXT w/ VDMA
should be just fine as is WIN_WRITE_EXT w/ VDMA currently?

> > Long-term we should see if it is possible to remove dynamic IDE
> > drive configuration and always just use the best possible settings.
>
> Hotplug rather prevents that. For the lifetime of a drive connection
> most of the settings ought to be settable once. Speeds are the obvious
> exception.

I'm talking only about lifetime of a drive connection here
so I think that we fully agree on this one.

Thanks,
Bartlomiej
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