Merge tag 'topic/drm-misc-2016-04-01' of git://anongit.freedesktop.org/drm-intel into drm-next

* tag 'topic/drm-misc-2016-04-01' of git://anongit.freedesktop.org/drm-intel:
  drm: Add new DCS commands in the enum list
  drm: Make uapi headers C89 pendantic compliant
  drm/atomic: export drm_atomic_helper_wait_for_fences()
  drm: Untangle __KERNEL__ guards
  drm: Move DRM_MODE_OBJECT_* to uapi headers
  drm: align #include directives with libdrm in uapi headers
  drm: Make drm.h uapi header safe for C++
  vgacon: dummy implementation for vgacon_text_force
  drm/sysfs: Nuke TV/DVI property files
  drm/ttm: Remove TTM_HAS_AGP
  drm: bridge/dw-hdmi: Remove pre_enable/post_disable dummy funcs
  Revert "drm: Don't pass negative delta to ktime_sub_ns()"
  drm/atmel: Fixup drm_connector_/unplug/unregister/_all
  drm: Rename drm_connector_unplug_all() to drm_connector_unregister_all()
  drm: bridge: Make (pre/post) enable/disable callbacks optional

1 files changed, 13 insertions, 2 deletions

diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index 4befe25c81c7..7bf678ee7f81 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -984,7 +984,17 @@ void drm_atomic_helper_commit_modeset_enables(struct drm_device *dev,
 }
 EXPORT_SYMBOL(drm_atomic_helper_commit_modeset_enables);
 
-static void wait_for_fences(struct drm_device *dev,
+/**
+ * drm_atomic_helper_wait_for_fences - wait for fences stashed in plane state
+ * @dev: DRM device
+ * @state: atomic state object with old state structures
+ *
+ * For implicit sync, driver should fish the exclusive fence out from the
+ * incoming fb's and stash it in the drm_plane_state.  This is called after
+ * drm_atomic_helper_swap_state() so it uses the current plane state (and
+ * just uses the atomic state to find the changed planes)
+ */
+void drm_atomic_helper_wait_for_fences(struct drm_device *dev,
 			    struct drm_atomic_state *state)
 {
 	struct drm_plane *plane;
@@ -1002,6 +1012,7 @@ static void wait_for_fences(struct drm_device *dev,
 		plane->state->fence = NULL;
 	}
 }
+EXPORT_SYMBOL(drm_atomic_helper_wait_for_fences);
 
 /**
  * drm_atomic_helper_framebuffer_changed - check if framebuffer has changed
@@ -1163,7 +1174,7 @@ int drm_atomic_helper_commit(struct drm_device *dev,
 	 * current layout.
 	 */
 
-	wait_for_fences(dev, state);
+	drm_atomic_helper_wait_for_fences(dev, state);
 
 	drm_atomic_helper_commit_modeset_disables(dev, state);