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This function actually control the vblank on/off. It shouldn't be bypassed for VF. Otherwise all the vblank based feature on VF will not work. Signed-off-by: shaoyunl <shaoyun.liu@amd.com> Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>