Add helper macros to iterate the current, or incoming set of planes
attached to a crtc. These helpers are only available for drivers
converted to use atomic-helpers.
Signed-off-by: Rob Clark <robdclark@xxxxxxxxx>
---
Documentation/DocBook/drm.tmpl | 1 +
include/drm/drm_atomic_helper.h | 26 ++++++++++++++++++++++++++
2 files changed, 27 insertions(+)
diff --git a/Documentation/DocBook/drm.tmpl b/Documentation/DocBook/drm.tmpl
index 8c54f9a..3789f2d 100644
--- a/Documentation/DocBook/drm.tmpl
+++ b/Documentation/DocBook/drm.tmpl
@@ -2343,6 +2343,7 @@ void intel_crt_init(struct drm_device *dev)
<title>Atomic State Reset and Initialization</title>
!Pdrivers/gpu/drm/drm_atomic_helper.c atomic state reset and initialization
</sect3>
+!Iinclude/drm/drm_atomic_helper.h
!Edrivers/gpu/drm/drm_atomic_helper.c
</sect2>
<sect2>
diff --git a/include/drm/drm_atomic_helper.h b/include/drm/drm_atomic_helper.h
index 64b4e91..42d56e6 100644
--- a/include/drm/drm_atomic_helper.h
+++ b/include/drm/drm_atomic_helper.h
@@ -96,5 +96,31 @@ drm_atomic_helper_connector_duplicate_state(struct drm_connector *connector);
void drm_atomic_helper_connector_destroy_state(struct drm_connector *connector,
struct drm_connector_state *state);
+/**
+ * drm_crtc_for_each_plane - iterate over planes currently attached to crtc
+ * @plane: the loop cursor
+ * @crtc: the crtc whose planes are iterated
+ *
+ * This iterates over the current state, useful (for example) when applying
+ * atomic state after it has been checked and swapped. To iterate over the
+ * planes which *will* be attached (for ->atomic_check()) see
+ * drm_crtc_for_each_pending_plane()
+ */
+#define drm_crtc_for_each_plane(plane, crtc) \
+ list_for_each_entry((plane), &(crtc)->dev->mode_config.plane_list, head) \
+ if ((crtc)->state->plane_mask & (1 << drm_plane_index(plane)))
+
+/**
+ * drm_crtc_for_each_pending_plane - iterate over attached planes in new state
+ * @plane: the loop cursor
+ * @crtc_state: the incoming crtc-state
+ *
+ * Similar to drm_crtc_for_each_plane(), but iterates the planes that will be
+ * attached if the specified state is applied. Useful during (for example)
+ * ->atomic_check() operations, to validate the incoming state
+ */
+#define drm_crtc_for_each_pending_plane(plane, crtc_state) \
+ list_for_each_entry((plane), &(crtc_state)->state->dev->mode_config.plane_list, head) \
+ if ((crtc_state)->plane_mask & (1 << drm_plane_index(plane)))
#endif /* DRM_ATOMIC_HELPER_H_ */
--
1.9.3
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