drm/msm: simplify rsc wait for vblank behavior

Simplify the RSC wait for VBLANK behavior which needs to wait
for one VBLANK on the primary panel after hardware state
transitions. The current implementation requires posting a
VBLANK event to potentially a different thread, which can lead
to race conditions and additional complexity. Instead, simply
sleep for the expected worst case VBLANK time.

Change-Id: I7ed53af6f819d7e5340720c6506f3f69beaf3328
Signed-off-by: Lloyd Atkinson <latkinso@codeaurora.org>
1 file changed