EXA pixmap alignments.
michel at daenzer.net
Wed Sep 28 14:03:13 PDT 2005
On Wed, 2005-09-28 at 09:18 -0400, Felix Kühling wrote:
> Am Mittwoch, den 28.09.2005, 18:59 +1000 schrieb Benjamin Herrenschmidt:
> > On Wed, 2005-09-28 at 08:32 +0200, Lars Knoll wrote:
> > > Btw, is there any way to know if an AGP chipset supports writes
> > > from card to AGP?
> > Not really afaik. The radeon DRI does a sneaky test at startup, it
> > "tries" to do a writeback to a scratch location and verifies if it
> > actually worked. If not, it uses MMIO reads to read the scratch value
> > (used for register aging afaik), if yes, it reads the one that was
> > written to AGP. That's the only thing that info is used for though at
> > the moment.
> That test used to be unreliable on my old Radeon 7500. The test would
> pass and the AGP writeback would fail later on after a few seconds of
> 3D. I had to work around that problem by reducing AGP speed from 4x to
Yeah, we should really use PCI transfers for scratch register and ring
read pointer writeback.
Earthling Michel Dänzer | Debian (powerpc), X and DRI developer
Libre software enthusiast | http://svcs.affero.net/rm.php?r=daenzer
More information about the xorg