If two consecutive call are made to drmModePageFlip, the second call may fail with -EBUSY because the first flip is not completed yet. This patch adds a wait for completion mechanism based on drmHandleEvent. Change-Id: Ied13ebefc7523003431b1b307bae70d1a70cb24b Signed-off-by: Jeremy Compostella <jeremy.compostella@intel.com> Signed-off-by: Benoit Fradin <benoit.fradin@intel.com>