Re: [Linux-fbdev-devel] [PATCH]: EDID parser

Petr Vandrovec
2003-04-03T00:56:23Z

On 2 Apr 03 at 22:55, James Simmons wrote:

> It doesn't need a struct pci_dev in this case. It is possible to get this
> info from the i2c bus but I never seen any drivers do this. What data would
> we have to pass in get the EDID inforamtion? So the question is how
> generic will get_EDID end up being or will we have to have driver specfic
> hooks since I don't pitcure i2c approaches being the same for each video
> card. Petr didn't you attempt this with the matrox driver at one time?

Yes, matroxfb provides one i2c (DDC) bus for each output videocard has.
I ended with only this support (and userspace EDID parser) as i2c was
initialized loong after framebuffer at that time... Now when i2c is usable
when fbdev initializes, it looks much better.

Only get_EDID interface I need is one which gets i2c bus as argument. But
I have no idea how I should handle situation where you have connected
two different monitors to both crtc1 outputs... Like 50Hz PAL TV &
60+Hz VGA monitor. Currently it is user responsibility to resolve such
situation...
Petr