drm/atomic: add a drm_atomic_clean_old_fb helper.

This is useful for all the boilerplate code about cleaning old_fb.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1447237751-9663-4-git-send-email-maarten.lankhorst@ubuntu.com

diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index 0ac31b1ecb676790875705430a14aa1787cc7b05..aeee083c7f95064fed6c6b08cd67b58d174204af 100644 (file)
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -1432,6 +1432,45 @@ static int atomic_set_prop(struct drm_atomic_state *state,
        return ret;
 }
 
+/**
+ * drm_atomic_update_old_fb -- Unset old_fb pointers and set plane->fb pointers.
+ *
+ * @dev: drm device to check.
+ * @plane_mask: plane mask for planes that were updated.
+ * @ret: return value, can be -EDEADLK for a retry.
+ *
+ * Before doing an update plane->old_fb is set to plane->fb,
+ * but before dropping the locks old_fb needs to be set to NULL
+ * and plane->fb updated. This is a common operation for each
+ * atomic update, so this call is split off as a helper.
+ */
+void drm_atomic_clean_old_fb(struct drm_device *dev,
+                            unsigned plane_mask,
+                            int ret)
+{
+       struct drm_plane *plane;
+
+       /* if succeeded, fixup legacy plane crtc/fb ptrs before dropping
+        * locks (ie. while it is still safe to deref plane->state).  We
+        * need to do this here because the driver entry points cannot
+        * distinguish between legacy and atomic ioctls.
+        */
+       drm_for_each_plane_mask(plane, dev, plane_mask) {
+               if (ret == 0) {
+                       struct drm_framebuffer *new_fb = plane->state->fb;
+                       if (new_fb)
+                               drm_framebuffer_reference(new_fb);
+                       plane->fb = new_fb;
+                       plane->crtc = plane->state->crtc;
+
+                       if (plane->old_fb)
+                               drm_framebuffer_unreference(plane->old_fb);
+               }
+               plane->old_fb = NULL;
+       }
+}
+EXPORT_SYMBOL(drm_atomic_clean_old_fb);
+
 int drm_mode_atomic_ioctl(struct drm_device *dev,
                          void *data, struct drm_file *file_priv)
 {
@@ -1577,24 +1616,7 @@ retry:
        }
 
 out:
-       /* if succeeded, fixup legacy plane crtc/fb ptrs before dropping
-        * locks (ie. while it is still safe to deref plane->state).  We
-        * need to do this here because the driver entry points cannot
-        * distinguish between legacy and atomic ioctls.
-        */
-       drm_for_each_plane_mask(plane, dev, plane_mask) {
-               if (ret == 0) {
-                       struct drm_framebuffer *new_fb = plane->state->fb;
-                       if (new_fb)
-                               drm_framebuffer_reference(new_fb);
-                       plane->fb = new_fb;
-                       plane->crtc = plane->state->crtc;
-
-                       if (plane->old_fb)
-                               drm_framebuffer_unreference(plane->old_fb);
-               }
-               plane->old_fb = NULL;
-       }
+       drm_atomic_clean_old_fb(dev, plane_mask, ret);
 
        if (ret && arg->flags & DRM_MODE_PAGE_FLIP_EVENT) {
                /*

diff --git a/include/drm/drm_atomic.h b/include/drm/drm_atomic.h
index e67aeac2aee05c077eec5a47abc9d73eef6831d6..4b74c97d297a3e8f24a50de057cb4db79750f39c 100644 (file)
--- a/include/drm/drm_atomic.h
+++ b/include/drm/drm_atomic.h
@@ -136,6 +136,9 @@ drm_atomic_connectors_for_crtc(struct drm_atomic_state *state,
 
 void drm_atomic_legacy_backoff(struct drm_atomic_state *state);
 
+void
+drm_atomic_clean_old_fb(struct drm_device *dev, unsigned plane_mask, int ret);
+
 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);