Re: mono, gray and index configs

Here's a new version that actually lets me set all possible scanout
configs on radeonfb. I can even set I4 but I don't think the code is
correct for it yet everywhere in radeonfb. The core code in the patch
should be ok. My further changes should be restricted to the radeonfb
code. For example, I haven't added the logic to radeonfb to "round up"
to the next config.

You get two new sysfs attributes:
configs - optional, but really nice to have, list of all configs
supported by the driver
config - current config the hardware is set to.

example syntax...
[root@jonsmirl fb0]# cat configs
I4
I8
A1R5G5B5
R5G6B5
R8G8B8
A8R8G8B8
A4R4G4B4
A8I8
A2R10G10B10

Offsets are computed from the field widths. So if a card sets BGR vs
RGB and you cat its config you will see RGB or BGR in the config
string. M is used for a grayscale field.

So give the patch a try and start expanding it to handle other cards.

-- 
Jon Smirl
jonsmirl@gmail.com