On Thu, Apr 28, 2016 at 07:43:16PM +0200, Daniel Vetter wrote:
On Thu, Apr 28, 2016 at 6:56 PM, Ville Syrjälä ville.syrjala@linux.intel.com wrote:
- better for tracing, can identify the buffer/fence promptly
Can fences be reused somehow while still attached to a plane, or ever? That might cause some oddness if you, say, leave a fence attached to one plane and then do a modeset on another crtc perhaps which needs to turn the first crtc off+on to reconfigure something.
Fences auto-disappear of course and don't stick around when you duplicate the drm_plane_state again. I still don't really get the real concerns though ...
Properties that magically change values shouldn't exist IMO. I guess if you could have write-only properties or something it migth be sensible?
In the end it's purely a transport question, and both ABI ideas work out semantically exactly the same in the end. It's just that at least in my opinion FENCE_FD prop is a lot more convenient.
-Daniel
Daniel Vetter Software Engineer, Intel Corporation +41 (0) 79 365 57 48 - http://blog.ffwll.ch