DFP support for kernel radeonfb.c added

Daniel Berlin dan at cgsoftware.com
Thu Nov 15 09:14:25 EST 2001

On Wed, 14 Nov 2001, Benjamin Herrenschmidt wrote:

> >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.

Well, the GPIO's are used to control i2c as well (gpio 0 and 3, if i
remember right), so it might just be a red herring.

> Ben.

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