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.
However, even after this commit we still needed the wait because
otherwise we cannot wait for the flip_done because this item might
have been removed from the list.
Changed since v1:
- Make mention of cleanup_done completing before flip_done.
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
Suggested-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
---
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 9001fc1023b1..1f5cdafb050e 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -1863,7 +1863,6 @@ 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 = new_crtc_state->commit;
@@ -1873,22 +1872,6 @@ 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
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