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Subject: Re: [PATCH] sl82c105 driver update
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Vojtech Pavlik <vojtech@suse.cz>
Cc: linux-kernel@vger.kernel.org
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On Sat, 2003-01-11 at 23:48, Vojtech Pavlik wrote:

> > Note that I think sl82c105 and ide-pmac are the only ones to redo the
> > DMA config on ide_dma_on. Most chipsets only do it on ide_dma_check, but
> > I chosed to do it in ide_dma_on too mostly because I found no way to
> > re-trigger ide_dma_check from hdparm (well, this might have changed
> > since, I have to dbl check).
> 
> Correct, and it seems that if you have automatic DMA disabled in the
> kernel and then use hdparm -d1, this leads to a lot of trouble.

Which is why I did that in the first place on pmac, so that hdparm -d1
gave proper timings in the first place (my firmware does nothing useful
and I hard reset the drives & controller on boot anyway).


-- 
Benjamin Herrenschmidt <benh@kernel.crashing.org>
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