Re: [PATCH] Add fb_check_var() for fixed mode device.

[Helge Deller <deller@gmx.de>]

Michel Dänzer wrote:
> On Tue, 2008-09-02 at 21:11 +0200, Helge Deller wrote:
>> Helge Deller wrote:
>>> The attached patch is a completely different approach to solve the 
>>> issue. I've tested it, and it works even with the buggy version of X 
>>> (1.4.2).
>>>
>>> Basic idea is, that when we have fixed mode devices (aka drivers which 
>>> don't implement fb_check_var) we just simply fill in a "emulated" valid 
>>> monitor/modeline into the var struct during the register_framebuffer() 
>>> initialization call. Since the modeline is valid, X does not has any 
>>> problems with it.
>>>
>>> The patch has a few benefits:
>>> a) We still keep binary compatability/behavior for FBIOGET_VSCREENINFO 
>>> and FBIOPUT_VSCREENINFO.
>>> b) In Xorg.conf files, users can simply delete all monitor and display 
>>> sections -> Xorg will autoconfigure itself to the only valid 
>>> resolution/modeline itself on all devices (I really like this!!!)
>>>
>>> Thus, the patch basically changes the fixed mode drivers to have some 
>>> monitor timings by default. As an example, before I got:
>>> root@c3000:~# fbset -i
>>> mode "1024x768"
>>>     geometry 1024 768 1024 768 8
>>>     timings 0 0 0 0 0 0 0
>>>     rgba 8/0,8/0,8/0,0/0
>>> endmode
>>>
>>> Now I see:
>>> root@c3000:~# fbset -i
>>> mode "1024x768-60"
>>>     # D: 65.003 MHz, H: 48.365 kHz, V: 60.006 Hz
>>>     geometry 1024 768 1024 768 8
>>>     timings 15384 168 8 29 3 144 6
>>>     rgba 8/0,8/0,8/0,0/0
>>> endmode
>>>
>>> Opinions ?
>> Sadly nobody answered yet....
> 
> FWIW, I like this approach much better.

Thanks Michel,

I'll send an updated patch shortly (in a new thread) which
fixes the english comment as well.

Helge


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