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This function registers a notifier to dmc devfreq, devfreq thread will lock the mutex of vop when scaling frequency, so vop_crtc will not be disabled when it is waiting for line flag. Change-Id: I886e5dc5d36a0f14f35662cec3423a2c5550a7a6 Signed-off-by: Finley Xiao <finley.xiao@rock-chips.com>