Re: IDE + CPU Scaling problem on Via EPIA systems

[Alan Cox]

On Llu, 2005-11-28 at 01:32 -0500, Dave Jones wrote:
> On some variants of the VIA C3, we need to quiesce all DMA operations
> before we do a speed transition. We currently don't do that.
> I do have a patch from someone which adds support in the longhaul
> driver to wait for IDE transactions to stop, but to do it cleanly,
> we really need some callbacks into the IDE layer.

I was under the impression you could turn the IO/MEM enable on the root
bridge off momentarily to get the needed DMA pause safely ? Or does it
abort rather than retry at that point ?

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