drm/msm: Use customized function to wait for atomic commit done
MDP FLUSH registers could indicate if the previous flush updates has taken effect at vsync boundary. Making use of this H/W feature can catch the vsync that happened between CRTC atomic_flush and *_wait_for_vblanks, to avoid unnecessary wait. This change allows kms CRTCs to use their own *_wait_for_commit_done functions to wait for FLUSH register cleared at vsync, before commit completion. Signed-off-by: NHai Li <hali@codeaurora.org> Signed-off-by: NRob Clark <robdclark@gmail.com>
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