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At vop2_wait_for_irq_handler() we need to synchronize frame start irq, This is to avoid the ongoing commit very close to fs, and might be racing with a requested vblank interrupt, which would increment the software vblank counter before the changes being committed actually happen. besides, from rk3576 vop can support independent irq for each vp, we confirm vop2->merge_irq state at vop2_bind, and simplification other function logic. Signed-off-by: Sandy Huang <hjc@rock-chips.com> Change-Id: If93d8de7840590645c53bd3720eaca2f818a3cbe