[Mesa-dev] [PATCH] i965: Use the predicate enable bit for conditional rendering without stalling

Kenneth Graunke kenneth at whitecape.org
Mon Nov 10 23:23:14 PST 2014

On Monday, November 10, 2014 02:57:22 PM Neil Roberts wrote:
> I'm not really sure if I understand your reply correctly. Did you see
> that I also posted the corresponding kernel patch? I was testing my
> patch on top of the drm-intel-next branch with IvyBridge.

That's why.  Ivybridge has had the hardware checker disabled for a long time 
(basically, enabling PPGTT disables it), so you could write any registers you 
want.  Haswell allows PPGTT + the hardware checker, so the kernel does that, 
and your register writes git turned into MI_NOOP.

drm-intel-next must have the new software checker turned on, which disallows 
non-whitelisted register writes (along with libva, so it can't really be 
enabled upstream yet).

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