drm/atomic: Add drm_atomic_crtc_state_for_each_plane_state
... and use it in msm&vc4. Again just want to encapsulate
drm_atomic_state internals a bit.
The const threading is a bit awkward in vc4 since C sucks, but I still
think it's worth to enforce this. Eventually I want to make all the
obj->state pointers const too, but that's a lot more work ...
v2: Provide safe macro to wrap up the unsafe helper better, suggested
by Maarten.
v3: Fixup subject (Maarten) and spelling fixes (Eric Engestrom).
Cc: Eric Anholt <eric@anholt.net>
Cc: Rob Clark <robdclark@gmail.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Eric Engestrom <eric.engestrom@imgtec.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1464877304-4213-1-git-send-email-daniel.vetter@ffwll.ch
diff --git a/include/drm/drm_atomic_helper.h b/include/drm/drm_atomic_helper.h
index d473dcc..b03bd83 100644
--- a/include/drm/drm_atomic_helper.h
+++ b/include/drm/drm_atomic_helper.h
@@ -159,7 +159,7 @@
* 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()
+ * drm_crtc_for_each_pending_plane().
*/
#define drm_atomic_crtc_for_each_plane(plane, crtc) \
drm_for_each_plane_mask(plane, (crtc)->dev, (crtc)->state->plane_mask)
@@ -171,11 +171,31 @@
*
* 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
+ * ->atomic_check() operations, to validate the incoming state.
*/
#define drm_atomic_crtc_state_for_each_plane(plane, crtc_state) \
drm_for_each_plane_mask(plane, (crtc_state)->state->dev, (crtc_state)->plane_mask)
+/**
+ * drm_crtc_atomic_state_for_each_plane_state - iterate over attached planes in new state
+ * @plane: the loop cursor
+ * @plane_state: loop cursor for the plane's state, must be const
+ * @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.
+ *
+ * Compared to just drm_atomic_crtc_state_for_each_plane() this also fills in a
+ * const plane_state. This is useful when a driver just wants to peek at other
+ * active planes on this crtc, but does not need to change it.
+ */
+#define drm_atomic_crtc_state_for_each_plane_state(plane, plane_state, crtc_state) \
+ drm_for_each_plane_mask(plane, (crtc_state)->state->dev, (crtc_state)->plane_mask) \
+ for_each_if ((plane_state = \
+ __drm_atomic_get_current_plane_state((crtc_state)->state, \
+ plane)))
+
/*
* drm_atomic_plane_disabling - check whether a plane is being disabled
* @plane: plane object
