drm/atomic: add drm_atomic_get_existing_*_state helpers
authorMaarten Lankhorst <maarten.lankhorst@linux.intel.com>
Wed, 13 May 2015 08:37:25 +0000 (10:37 +0200)
committerDaniel Vetter <daniel.vetter@ffwll.ch>
Wed, 13 May 2015 09:28:22 +0000 (11:28 +0200)
There are cases where we want to test if a given object is
part of the state, but don't want to add them if they're not.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

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