Quoting Daniel Vetter (2019-02-13 09:50:55) > On Tue, Feb 12, 2019 at 10:32:31PM +0100, Mario Kleiner wrote: > > I think all kms drivers try to call drm_crtc_handle_vblank() at start > > of vblank to give Mesa the most time for frontbuffer rendering for > > classic X. But vblank events are also used for scheduling bufferswaps > > or other stuff for redirected windowed rendering, or via api's like > > OML_sync_controls glXWaitForMscOML, so there might be other things > > affected by a more delayed vblank handling. > > The frontbuffer rendering is very much X driver specific, and I think > -amdgpu/radeon is the only one that requires this. No i915 driver ever > used the vblank interrupt to schedule frontbuffer blits, we use some > CS-side stalls. Fwiw, the Present midlayer does use vblank scheduling for inplace copy updates. Not that I wish to encourage anyone to use frontbuffer rendering. -Chris _______________________________________________ amd-gfx mailing list amd-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/amd-gfx
