[PATCH 1/2] drm/fence: enable drm_atomic_helper_wait_for_fences() to interrupt

[Gustavo Padovan <gustavo@padovan.org>]

From: Gustavo Padovan <gustavo.padovan@collabora.co.uk>

Add an extra arg to  drm_atomic_helper_wait_for_fences() to inform
if fence_wait() should be called interruptible or uninterruptible.

Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
---
 drivers/gpu/drm/drm_atomic_helper.c | 19 ++++++++++++++-----
 drivers/gpu/drm/msm/msm_atomic.c    |  2 +-
 include/drm/drm_atomic_helper.h     |  5 +++--
 3 files changed, 18 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index f59e8c0..fa263b7 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -1003,18 +1003,22 @@ EXPORT_SYMBOL(drm_atomic_helper_commit_modeset_enables);
  * drm_atomic_helper_wait_for_fences - wait for fences stashed in plane state
  * @dev: DRM device
  * @state: atomic state object with old state structures
+ * @intr: if true, do an interruptible wait
  *
  * 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)
+ *
+ * Returns zero if sucess or < 0 if fence_wait() fails.
  */
-void drm_atomic_helper_wait_for_fences(struct drm_device *dev,
-			    struct drm_atomic_state *state)
+int drm_atomic_helper_wait_for_fences(struct drm_device *dev,
+				       struct drm_atomic_state *state,
+				       bool intr)
 {
 	struct drm_plane *plane;
 	struct drm_plane_state *plane_state;
-	int i;
+	int i, ret;
 
 	for_each_plane_in_state(state, plane, plane_state, i) {
 		if (!plane->state->fence)
@@ -1022,10 +1026,15 @@ void drm_atomic_helper_wait_for_fences(struct drm_device *dev,
 
 		WARN_ON(!plane->state->fb);
 
-		fence_wait(plane->state->fence, false);
+		ret = fence_wait(plane->state->fence, intr);
+		if (ret)
+			return ret;
+
 		fence_put(plane->state->fence);
 		plane->state->fence = NULL;
 	}
+
+	return 0;
 }
 EXPORT_SYMBOL(drm_atomic_helper_wait_for_fences);
 
@@ -1172,7 +1181,7 @@ static void commit_tail(struct drm_atomic_state *state)
 
 	funcs = dev->mode_config.helper_private;
 
-	drm_atomic_helper_wait_for_fences(dev, state);
+	drm_atomic_helper_wait_for_fences(dev, state, false);
 
 	drm_atomic_helper_wait_for_dependencies(state);
 
diff --git a/drivers/gpu/drm/msm/msm_atomic.c b/drivers/gpu/drm/msm/msm_atomic.c
index 4a8a6f1..9518e43 100644
--- a/drivers/gpu/drm/msm/msm_atomic.c
+++ b/drivers/gpu/drm/msm/msm_atomic.c
@@ -112,7 +112,7 @@ static void complete_commit(struct msm_commit *c, bool async)
 	struct msm_drm_private *priv = dev->dev_private;
 	struct msm_kms *kms = priv->kms;
 
-	drm_atomic_helper_wait_for_fences(dev, state);
+	drm_atomic_helper_wait_for_fences(dev, state, false);
 
 	kms->funcs->prepare_commit(kms, state);
 
diff --git a/include/drm/drm_atomic_helper.h b/include/drm/drm_atomic_helper.h
index d86ae5d..a42c34b 100644
--- a/include/drm/drm_atomic_helper.h
+++ b/include/drm/drm_atomic_helper.h
@@ -43,8 +43,9 @@ int drm_atomic_helper_commit(struct drm_device *dev,
 			     struct drm_atomic_state *state,
 			     bool nonblock);
 
-void drm_atomic_helper_wait_for_fences(struct drm_device *dev,
-					struct drm_atomic_state *state);
+int drm_atomic_helper_wait_for_fences(struct drm_device *dev,
+					struct drm_atomic_state *state,
+					bool intr);
 bool drm_atomic_helper_framebuffer_changed(struct drm_device *dev,
 					   struct drm_atomic_state *old_state,
 					   struct drm_crtc *crtc);
-- 
2.5.5