[PATCH 2/5] drm/atomic: Remove waits in drm_atomic_helper_commit_cleanup_done

[Maarten Lankhorst]

When commit synchronization through drm_crtc_commit was first
introduced, we tried to solve the problem of the flip_done
needing a reference count by blocking in cleanup_done.

This has been changed by commit 24835e442f28 ("drm: reference count
event->completion") which made the waits here no longer needed.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
Suggested-by: Daniel Vetter <daniel.vetter at ffwll.ch>
---
 drivers/gpu/drm/drm_atomic_helper.c | 17 -----------------
 1 file changed, 17 deletions(-)

diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index 4e53aae9a1fb..11d0e94a2181 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -1885,7 +1885,6 @@ void drm_atomic_helper_commit_cleanup_done(struct drm_atomic_state *old_state)
 	struct drm_crtc_state *new_crtc_state;
 	struct drm_crtc_commit *commit;
 	int i;
-	long ret;
 
 	for_each_new_crtc_in_state(old_state, crtc, new_crtc_state, i) {
 		commit = old_state->crtcs[i].commit;
@@ -1895,22 +1894,6 @@ void drm_atomic_helper_commit_cleanup_done(struct drm_atomic_state *old_state)
 		complete_all(&commit->cleanup_done);
 		WARN_ON(!try_wait_for_completion(&commit->hw_done));
 
-		/* commit_list borrows our reference, need to remove before we
-		 * clean up our drm_atomic_state. But only after it actually
-		 * completed, otherwise subsequent commits won't stall properly. */
-		if (try_wait_for_completion(&commit->flip_done))
-			goto del_commit;
-
-		/* We must wait for the vblank event to signal our completion
-		 * before releasing our reference, since the vblank work does
-		 * not hold a reference of its own. */
-		ret = wait_for_completion_timeout(&commit->flip_done,
-						  10*HZ);
-		if (ret == 0)
-			DRM_ERROR("[CRTC:%d:%s] flip_done timed out\n",
-				  crtc->base.id, crtc->name);
-
-del_commit:
 		spin_lock(&crtc->commit_lock);
 		list_del(&commit->commit_entry);
 		spin_unlock(&crtc->commit_lock);
-- 
2.11.0