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