How synchronisation works in Framebuffer backend

[Sannu K]

Hi,

I was going through weston's framebuffer backend code. It does not call
FBIO_WAITFORVSYNC ioctl.
http://cgit.freedesktop.org/wayland/weston/tree/src/compositor-fbdev.c#n188says
that it is not used intentionally. In this case, how weston syncs
frame with the framebuffer clock? How tearing is avoided?

Thanks in advance for the help.

Thanks and Regards,
Sannu K
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