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When doing a atomic commit affecting multiple crtc's, multiple events are generated. The user_data member does not allow you to distinguish, because they all have the same pointer. I've chosen to use crtc_id, because using pipe would create ambiguity when pipe = 0. A test for != 0 is easier to implement, and crtc_id will never be 0. Change-Id: Ie2daba50f711f298872f15498b8d46dedb38c0ff Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Cc: David Airlie <airlied@linux.ie> Cc: Daniel Stone <daniels@collabora.com> Signed-off-by: Mark Yao <mark.yao@rock-chips.com> (am from https://patchwork.kernel.org/patch/9272895/)