Re: Nvidia cable detection problems (was [PATCH] amd74xx: don't configureudma mode higher than BIOS did)

[Jeff Garzik]

Alan wrote:
> > > Well we can certainly do some of that if ACPI is present and active. In
> > > particular since _GTM will give us current modes allowing for hotplug and
> > > post BIOS boot kexec etc it ought to be safe to do Tejun's hack that way.
> > > We could even probe UDMA3+ capable devices by doing _STM to a high mode
> > > and _GTM to determine the cable type 8)
> > Glad to see the problem getting solved.  Now that we know the solution,
> > any volunteers?  :-)
>
> I am currently putting together an experimental pata_acpi driver to play
> with this stuff. May take a bit of time while I work out the current acpi
> interface gunge and how to expand it.
>
> The fact we have to try each mode to see what we can set doesn't make it
> pretty either!

Make sure you take a look at libata-dev.git#acpi which is the origin of 
the libata ACPI support found in -mm

That's pending for an upstream merge.

	Jeff



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