Present operations do not necessarily complete after the requested
time; if the CRTC has been blanked, they will complete
immediately. This means we cannot use the MSC value to tell when a
present has finished.
Instead of using MSC, track whether each present is complete by serial
number, which is the low 32-bits of the SBC value. This value is
provided in the present_pixmap request and returned in the present
complete notify event.
Signed-off-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Michel Dänzer <mdaenzer@redhat.com>
Reviewed-by: Adam Jackson <ajax@redhat.com>
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