DFP support for kernel radeonfb.c added

[Benjamin Herrenschmidt]

>No, I mean using i2c to grab it.

I think OF uses the Radeon "GPIO" registers to probe the panel type based
on a wired panel ID and a table of EDIDs in the driver. At least, it did
it that way on mach64. I dumped a disassembly of the Rage M3 (r128 base)
MacOS 9 driver of my Pismo and started tracing it, it seem to play with
GPIOs as well. I didn't yet figure out the exact algorithm though.

Ben.


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