[PATCH glint] Fix timing errors, as per documentation

[Mark Kettenis]

> From: Matt Turner <mattst88 at gmail.com>
> Date: Wed, 15 Sep 2010 23:37:55 -0400
> 
> pm2_dac.c:
> -	VsEnd and VsStart should have 1 subtracted, say the docs. This also
> 	matches with the PM3 and PM4 docs, and is what the pm2fb Linux
> 	kernel driver does.
> -	Move VsTotal subtract-1 to instantiation, since it doesn't need to
> 	be shifted before the subtraction, unlike horizontal timings
> 	(HTotal, for instance).
> -	Remove subtract-1 from HsStart, as the docs don't say this is
> 	correct. This also matches with the PM3 and PM4 docs, and is what
> 	the pm2fb Linux kernel driver does.
> 
> pm3_dac.c:
> -	Subtract 1 from HTotal after the Shiftbpp, as the docs say. This
> 	error has existed since xf86-video-glint was imported into git and
> 	has been propagated to the pm3fb Linux kernel driver.
> 
> Signed-off-by: Matt Turner <mattst88 at gmail.com>
> ---
> I know there isn't much interest in this hardware, but I'd really appreciate
> a couple of people looking over this change to make sure I didn't totally
> hose something. Acked-by's would be excellent.

I do care; Sun sold a fairly large number of PGX32 framebuffers with
their UltraSPARC hardware.  I have one, and I'll try to test this
change on that card in the next couple of days.