drm: Add drm_atomic_helper_wait_for_flip_done()
Add an helper to wait for all page flips of an atomic state to be done.
v2:
- Pimp kerneldoc as discussed with Boris on irc
- Add missing doc for @dev.
- Use old_state for consitency with wait_for_vblanks
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com> (v1)
Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1496392332-8722-2-git-send-email-boris.brezillon@free-electrons.com
diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index 93b0221..45b4f34 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -1185,9 +1185,13 @@ EXPORT_SYMBOL(drm_atomic_helper_wait_for_fences);
*
* Helper to, after atomic commit, wait for vblanks on all effected
* crtcs (ie. before cleaning up old framebuffers using
- * drm_atomic_helper_cleanup_planes()). It will only wait on crtcs where the
+ * drm_atomic_helper_cleanup_planes()). It will only wait on CRTCs where the
* framebuffers have actually changed to optimize for the legacy cursor and
* plane update use-case.
+ *
+ * Drivers using the nonblocking commit tracking support initialized by calling
+ * drm_atomic_helper_setup_commit() should look at
+ * drm_atomic_helper_wait_for_flip_done() as an alternative.
*/
void
drm_atomic_helper_wait_for_vblanks(struct drm_device *dev,
@@ -1235,6 +1239,43 @@ drm_atomic_helper_wait_for_vblanks(struct drm_device *dev,
EXPORT_SYMBOL(drm_atomic_helper_wait_for_vblanks);
/**
+ * drm_atomic_helper_wait_for_flip_done - wait for all page flips to be done
+ * @dev: DRM device
+ * @old_state: atomic state object with old state structures
+ *
+ * Helper to, after atomic commit, wait for page flips on all effected
+ * crtcs (ie. before cleaning up old framebuffers using
+ * drm_atomic_helper_cleanup_planes()). Compared to
+ * drm_atomic_helper_wait_for_vblanks() this waits for the completion of on all
+ * CRTCs, assuming that cursors-only updates are signalling their completion
+ * immediately (or using a different path).
+ *
+ * This requires that drivers use the nonblocking commit tracking support
+ * initialized using drm_atomic_helper_setup_commit().
+ */
+void drm_atomic_helper_wait_for_flip_done(struct drm_device *dev,
+ struct drm_atomic_state *old_state)
+{
+ struct drm_crtc_state *crtc_state;
+ struct drm_crtc *crtc;
+ int i;
+
+ for_each_crtc_in_state(old_state, crtc, crtc_state, i) {
+ struct drm_crtc_commit *commit = old_state->crtcs[i].commit;
+ int ret;
+
+ if (!commit)
+ continue;
+
+ 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);
+ }
+}
+EXPORT_SYMBOL(drm_atomic_helper_wait_for_flip_done);
+
+/**
* drm_atomic_helper_commit_tail - commit atomic update to hardware
* @old_state: atomic state object with old state structures
*