drm: export atomic wait_for_vblanks helper (v2)

v1: original
v2: danvet's kerneldoc nitpicks

Signed-off-by: Rob Clark <robdclark@gmail.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Dave Airlie <airlied@redhat.com>

2 files changed, 17 insertions, 3 deletions

diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index ca839bd9bb0d..fad2b932cf72 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -754,8 +754,18 @@ static void wait_for_fences(struct drm_device *dev,
         }
 }
 
-static void
-wait_for_vblanks(struct drm_device *dev, struct drm_atomic_state *old_state)
+/**
+ * drm_atomic_helper_wait_for_vblanks - wait for vblank on crtcs
+ * @dev: DRM device
+ * @old_state: atomic state object with old state structures
+ *
+ * Helper to, after atomic commit, wait for vblanks on all effected
+ * crtcs (ie. before cleaning up old framebuffers using
+ * drm_atomic_helper_cleanup_planes())
+ */
+void
+drm_atomic_helper_wait_for_vblanks(struct drm_device *dev,
+                struct drm_atomic_state *old_state)
 {
         struct drm_crtc *crtc;
         struct drm_crtc_state *old_crtc_state;
@@ -800,6 +810,7 @@ wait_for_vblanks(struct drm_device *dev, struct drm_atomic_state *old_state)
                 drm_crtc_vblank_put(crtc);
         }
 }
+EXPORT_SYMBOL(drm_atomic_helper_wait_for_vblanks);
 
 /**
  * drm_atomic_helper_commit - commit validated state object
@@ -859,7 +870,7 @@ int drm_atomic_helper_commit(struct drm_device *dev,
 
         drm_atomic_helper_commit_post_planes(dev, state);
 
-        wait_for_vblanks(dev, state);
+        drm_atomic_helper_wait_for_vblanks(dev, state);
 
         drm_atomic_helper_cleanup_planes(dev, state);
 
diff --git a/include/drm/drm_atomic_helper.h b/include/drm/drm_atomic_helper.h
index 67e3c4645ae0..64b4e91b93bc 100644
--- a/include/drm/drm_atomic_helper.h
+++ b/include/drm/drm_atomic_helper.h
@@ -34,6 +34,9 @@ int drm_atomic_helper_commit(struct drm_device *dev,
                              struct drm_atomic_state *state,
                              bool async);
 
+void drm_atomic_helper_wait_for_vblanks(struct drm_device *dev,
+                                        struct drm_atomic_state *old_state);
+
 void drm_atomic_helper_commit_pre_planes(struct drm_device *dev,
                                          struct drm_atomic_state *state);
 void drm_atomic_helper_commit_post_planes(struct drm_device *dev,