[PATCH 05/36] drm/atomic: Add drm_atomic_plane_get_crtc_state()

[Thierry Reding]

From: Thierry Reding <treding@xxxxxxxxxx>

This function is useful to obtain the state of the CRTC that a plane is
being attached to.

Signed-off-by: Thierry Reding <treding@xxxxxxxxxx>
---
 include/drm/drm_atomic.h | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/include/drm/drm_atomic.h b/include/drm/drm_atomic.h
index 51168a8b723a..ddca107e5cce 100644
--- a/include/drm/drm_atomic.h
+++ b/include/drm/drm_atomic.h
@@ -75,4 +75,25 @@ int __must_check drm_atomic_check_only(struct drm_atomic_state *state);
 int __must_check drm_atomic_commit(struct drm_atomic_state *state);
 int __must_check drm_atomic_async_commit(struct drm_atomic_state *state);
 
+/**
+ * drm_atomic_plane_get_crtc_state - obtain atomic state of the CRTC that a
+ *     plane is being attached to
+ * @state: atomic state of plane
+ *
+ * Getting the atomic state of the CRTC that a given plane being attached to
+ * is non-trivial. We need to look at the global atomic state that the plane
+ * state is part of and extract the CRTC state using the CRTC's index. Using
+ * the drm_atomic_get_crtc_state() helper we make sure to acquire the proper
+ * locks, too.
+ *
+ * RETURNS:
+ * The atomic state of the CRTC that the plane is being attached to, or an
+ * ERR_PTR()-encoded negative error code on failure.
+ */
+static inline struct drm_crtc_state *
+drm_atomic_plane_get_crtc_state(struct drm_plane_state *state)
+{
+	return drm_atomic_get_crtc_state(state->state, state->crtc);
+}
+
 #endif /* DRM_ATOMIC_H_ */
-- 
2.1.3

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