Re: Best way to support mulitple planes?

["Antonino A. Daplas" <adaplas@gmail.com>]

On Sun, 2007-09-16 at 10:32 +0800, Antonino A. Daplas wrote:
> On Thu, 2007-09-13 at 14:50 -0500, Timur Tabi wrote:
> > 
> > The reason I ask is that our hardware can only handle three planes if the 
> > resolution is 1024x768 or below.  I can't figure out any way of telling the 
> > framebuffer subsystem that if it switches to 1280x1024 in plane 0, that plane 
> > 1 and 2 no longer exist.  Any suggestions on how to handle that?
> 
> You can change the type from FB_TYPE_PLANES to FB_TYPE_PACKED_PIXELS in
> fb_fix_screeninfo.  That implies that for each SET_VAR ioctl, you do a
> GET_FIX ioctl.
> 

If you want separate /dev/fb's for each plane, then setup your own
notifier system so each of the /dev/fb's  can communicate with each
other.

See drivers/video/fb_notify.c, and look at
drivers/video/backlight/backlight.c, drivers/video/fbmem.c and
drivers/video/console/fbcon.c on how this communication is done.

Tony



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