[PATCH 2/2] drm/radeon: Restrict offset for legacy display engine.

[Michel Dänzer]

On Mit, 2012-03-14 at 15:13 -0400, Alex Deucher wrote: 
> 2012/3/14 Michel Dänzer <michel at daenzer.net>:
> > From: Michel Dänzer <michel.daenzer at amd.com>
> >
> > The hardware only takes 27 bits for the offset, so larger offsets are
> > truncated, and the display shows random bits other than the intended ones.
> >
> > Signed-off-by: Michel Dänzer <michel.daenzer at amd.com>
> 
> Reviewed-by: Alex Deucher <alexander.deucher at amd.com>
> 
> This should probably go to stable as well.

Probably, but I'm hesitating to tag it for that while it's only
compile-tested. :)


> I think it may also fix this bug:
> https://bugzilla.kernel.org/show_bug.cgi?id=16515

Hmm, I'm not very optimistic for that, but it's certainly worth a shot.
Thanks for following up on it. I suspect this might be the root cause of
other bug reports as well.


-- 
Earthling Michel Dänzer           |                   http://www.amd.com
Libre software enthusiast         |          Debian, X and DRI developer