On Sat, Jun 9, 2012 at 12:22 AM, Erik Gilling <konkers@xxxxxxxxxxx> wrote: > The current linux graphics stack does not allow synchronization > between the GPU and a camera/video decoder. When we've seen people > try to support this behind the scenes, they get it wrong and introduce > bugs that can take weeks to track down. As stated in the previous > email, one of our goals is to centrally manage synchronization so that > it's easer for people bringing up a platform to get it right. I agree that letting everyone reinvent the wheel isn't the best idea for cross-device sync - people will just get it wrong way too often. I'm not convinced yet that doing it with explicit sync points/fences and in userspace is the best solution. dri2/gem all use implicit sync points managed by the kernel in a transparent fashion, so I'm leaning towards such a sulotion for cross-device sync, too. Imo the big upside of such an implicitly sync'ed approach is that it massively simplifies cross-process protocols (i.e. for the display server). So to foster understanding of the various requirements and use-cases, could you elaborate on the pros and cons a bit and explain why you think explicit sync points managed by the userspace display server is the best approach for android? Yours, Daniel -- Daniel Vetter daniel.vetter@xxxxxxxx - +41 (0) 79 364 57 48 - http://blog.ffwll.ch -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
