[Mesa-dev] [Bug 85203] [DRI2][RadeonSI] Pageflip completion event has impossible msc.

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Mon Nov 24 23:44:55 PST 2014


Michel Dänzer <michel at daenzer.net> changed:

           What    |Removed                     |Added
                 CC|                            |mario.kleiner at tuebingen.mpg
                   |                            |.de

--- Comment #4 from Michel Dänzer <michel at daenzer.net> ---
Mario, any ideas?

These are possible scenarios I can think of where this could still happen:

1. The pflip interrupt triggers before the corresponding vblank interrupt
2. The page flip is queued just before the vertical blank period, such that
   too late for the corresponding vblank interrupt to trigger, but early enough
   for the flip to complete in the same vertical blank period.
3. Race condition when enabling the vblank interrupt, causing the vertical
   counter to be off by 1.

AFAIK 1. shouldn't happen, not sure if 2. can happen.

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