Messages in this thread | | | Date | Mon, 05 Feb 2007 16:43:24 -0500 | From | Jeff Garzik <> | Subject | Re: Nvidia cable detection problems (was [PATCH] amd74xx: don't configure udma mode higher than BIOS did) |
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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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