[Bug 75629] [r128] Changes needed for RandR support

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=75629

--- Comment #8 from Connor Behan <connor.behan at gmail.com> ---
(In reply to comment #7)
> As for monitor detection, you need to sort out how the ddc lines are wired
> up to the connectors.  IIRC, r128 only implemented ddc support for DVI, so
> for VGA, you'd need to figure out what ddc line (basically just a gpio pad)
> it uses and what bits are used for read and write.  It should be pretty
> similar to radeon.  If you can't figure it out from trial and error, you can
> try and snoop what the vbios is doing when you issue a vbe ddc command.

If r128 cards use a gpio pad for VGA, doesn't that mean they do implement ddc?

I looket at which register is used by radeon. It appears to be
RADEON_GPIO_VGA_DDC at offset 0x0060. And this is in a part of the code that
specifically refers to r128:
http://cgit.freedesktop.org/~agd5f/xf86-video-ati/tree/src/radeon_bios.c?h=r128-support#n347

Register 0x0060 is not in r128_reg.h, but if I add it by hand, I see the same
behaviour that I saw when it was using 0x0068: X crashes as soon as the driver
tries to read or write it. When you wrote the r128-support branch, do you
remember if the card you tested was VGA or DVI? Also, if it makes a difference,
VGA is the secondary port on my card.

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