fbdev timings

fbdev timings

[Otto Solares]

hi!

finally i am coding the video part of a "desktop engine",
but i want something that works profesionally, i'm using
fbdev and embedded mesa for it, i am trying to get the
video modes as automagically as posible, in that regard
my plan is to hack get-edid (cause we don't have a proper
mechanism from userspace, yea modedb is marked _init
and the new edid just works in radeons and only usable
too from kernelspace -end of critic :) into my software
and fallback to a text database like hwdata to obtain
monitor specs if edid doesn't work, but i have a problem,
how i am supposed to construct fbdev timings with just
this info:

- resolution (width x height, 800x600).
- hsync range (31-49 Khz)
- vsync range (48-80 hz)

i do know that is possible to contruct such timings
because the monitor specs in windows xp are stored
in /windows/inf/monitor.inf and contains only that
variables.  Please any detailed response in how can
they construct their timings with just this variables
and how can i use it with fbdevs from userspace in 2.6?

thanks in advance,

-solca

PS. i know 2 questions is a bad habit :) but here goes
the other: how can i access fbdev features like
acceleration from userspace? or i'm supposed to map
the MMIO registers and do my own voodoo?



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Re: fbdev timings

[Geert Uytterhoeven]

On Mon, 15 Sep 2003, Otto Solares wrote:
> PS. i know 2 questions is a bad habit :) but here goes
> the other: how can i access fbdev features like
> acceleration from userspace? or i'm supposed to map
> the MMIO registers and do my own voodoo?

Clear the FB_ACCELF_TEXT bit in fb_var_screeninfo.accel_flags, mmap the MMIO
registers and do your own voodoo.

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds



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Re: fbdev timings

[Kronos]

Il Mon, Sep 15, 2003 at 01:30:29AM -0600, Otto Solares ha scritto: 
> finally i am coding the video part of a "desktop engine",
> but i want something that works profesionally, i'm using
> fbdev and embedded mesa for it, i am trying to get the
> video modes as automagically as posible, in that regard
> my plan is to hack get-edid (cause we don't have a proper
> mechanism from userspace, yea modedb is marked _init
> and the new edid just works in radeons and only usable
> too from kernelspace -end of critic :)

Userspace can access edid block via sysfs and can do its own parsing.

> into my software
> and fallback to a text database like hwdata to obtain
> monitor specs if edid doesn't work, but i have a problem,
> how i am supposed to construct fbdev timings with just
> this info:
> 
> - resolution (width x height, 800x600).
> - hsync range (31-49 Khz)
> - vsync range (48-80 hz)

You can use vesa_modes (in modedb.c) or you can use fb_get_mode (see
fbmon.c).

> i do know that is possible to contruct such timings
> because the monitor specs in windows xp are stored
> in /windows/inf/monitor.inf and contains only that
> variables.  Please any detailed response in how can
> they construct their timings with just this variables
> and how can i use it with fbdevs from userspace in 2.6?

You can get  the whole var usign ioctls. Also, once  the class_dev stuff
is in place  (I'll send patches in few minutes)  every driver can export
its own stuff via sysfs.

Luca
-- 
Reply-To: kronos@kronoz.cjb.net
Home: http://kronoz.cjb.net
Non capisco tutta questa eccitazione per il Multitasking: 
io sono anni che leggo in bagno.


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Re: fbdev timings

[Otto Solares]

On Mon, Sep 15, 2003 at 09:43:54AM +0200, Geert Uytterhoeven wrote:
> On Mon, 15 Sep 2003, Otto Solares wrote:
> > PS. i know 2 questions is a bad habit :) but here goes
> > the other: how can i access fbdev features like
> > acceleration from userspace? or i'm supposed to map
> > the MMIO registers and do my own voodoo?
> 
> Clear the FB_ACCELF_TEXT bit in fb_var_screeninfo.accel_flags, mmap the MMIO
> registers and do your own voodoo.

Ok, thank you.

-solca



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