Re: Re: Fbdev magics

On Friday 07 May 2004 10:33, Antonino A. Daplas wrote:

On Friday 07 May 2004 11:26, Lucas Correia Villa Real wrote:

quoted

On Thursday 06 May 2004 06:17, Geert Uytterhoeven wrote:
...


I've seen some LCD display drivers for embedded devices that handled it
directly with request_irq() on 2.4. As I could see from the bottom layers
of fbdev, an interrupt handler in a driver doesn't seem to hurt anyone
there.. or am I wrong?

Within the console, you probably can't use interrupts, at least in 2.4.x.
However, there are patches around that uses an interrupt service especially
with waiting for vrefresh.  I've done it with the i810fb (around 2.4.18),
and I think matroxfb has one too.

Hi Tony,

I took a read into drivers/char/console.c, but it isn't clear to me why it's 
not possible (or better yet, advised) to install interrupt handlers within 
the console. Is it because tty devices are already called from interrupts?

Cheers,
Lucas


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