From 0108648749bfa5713ed0ceede2ee091f428a29d7 Mon Sep 17 00:00:00 2001
From: Boris Brezillon <boris.brezillon@free-electrons.com>
Date: Fri, 2 Jun 2017 10:32:06 +0200
Subject: [PATCH] drm: Add drm_atomic_helper_wait_for_flip_done()
Git-commit: 0108648749bfa5713ed0ceede2ee091f428a29d7
Patch-mainline: v4.14-rc1
References: FATE#322643 bsc#1055900
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
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/gpu/drm/drm_atomic_helper.c | 43 ++++++++++++++++++++++++++++++-
include/drm/drm_atomic_helper.h | 3 ++
include/drm/drm_modeset_helper_vtables.h | 3 +-
3 files changed, 47 insertions(+), 2 deletions(-)
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -1191,9 +1191,13 @@ EXPORT_SYMBOL(drm_atomic_helper_wait_for
*
* 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,
@@ -1241,6 +1245,43 @@ drm_atomic_helper_wait_for_vblanks(struc
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
*
--- a/include/drm/drm_atomic_helper.h
+++ b/include/drm/drm_atomic_helper.h
@@ -52,6 +52,9 @@ int drm_atomic_helper_wait_for_fences(st
void drm_atomic_helper_wait_for_vblanks(struct drm_device *dev,
struct drm_atomic_state *old_state);
+void drm_atomic_helper_wait_for_flip_done(struct drm_device *dev,
+ struct drm_atomic_state *old_state);
+
void
drm_atomic_helper_update_legacy_modeset_state(struct drm_device *dev,
struct drm_atomic_state *old_state);
--- a/include/drm/drm_modeset_helper_vtables.h
+++ b/include/drm/drm_modeset_helper_vtables.h
@@ -1169,7 +1169,8 @@ struct drm_mode_config_helper_funcs {
* After the atomic update is committed to the hardware this hook needs
* to call drm_atomic_helper_commit_hw_done(). Then wait for the upate
* to be executed by the hardware, for example using
- * drm_atomic_helper_wait_for_vblanks(), and then clean up the old
+ * drm_atomic_helper_wait_for_vblanks() or
+ * drm_atomic_helper_wait_for_flip_done(), and then clean up the old
* framebuffers using drm_atomic_helper_cleanup_planes().
*
* When disabling a CRTC this hook _must_ stall for the commit to