From: Gustavo Padovan gustavo.padovan@collabora.co.uk
Add infrastructure to wait for all planes updates to finish by using an atomic_t variable to track how many pending updates we are waiting plus a wait_queue for the wait part.
It also changes vblank behaviour and keeps it enabled for all types of updates
Signed-off-by: Gustavo Padovan gustavo.padovan@collabora.co.uk --- drivers/gpu/drm/exynos/exynos_drm_crtc.c | 18 +++++++++---- drivers/gpu/drm/exynos/exynos_drm_crtc.h | 1 + drivers/gpu/drm/exynos/exynos_drm_drv.c | 44 +++++++++++++++++++++++++++++++- drivers/gpu/drm/exynos/exynos_drm_drv.h | 4 +++ 4 files changed, 61 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/exynos/exynos_drm_crtc.c b/drivers/gpu/drm/exynos/exynos_drm_crtc.c index 582e041..d6c2c3f 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_crtc.c +++ b/drivers/gpu/drm/exynos/exynos_drm_crtc.c @@ -75,10 +75,7 @@ static void exynos_crtc_atomic_begin(struct drm_crtc *crtc, struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc); struct drm_plane *plane;
- if (crtc->state->event) { - WARN_ON(drm_crtc_vblank_get(crtc) != 0); - exynos_crtc->event = crtc->state->event; - } + exynos_crtc->event = crtc->state->event;
drm_atomic_crtc_for_each_plane(plane, crtc) { struct exynos_drm_plane *exynos_plane = to_exynos_plane(plane); @@ -156,6 +153,8 @@ struct exynos_drm_crtc *exynos_drm_crtc_create(struct drm_device *drm_dev, exynos_crtc->ops = ops; exynos_crtc->ctx = ctx;
+ init_waitqueue_head(&exynos_crtc->wait_update); + crtc = &exynos_crtc->base;
private->crtc[pipe] = crtc; @@ -197,6 +196,13 @@ void exynos_drm_crtc_disable_vblank(struct drm_device *dev, int pipe) exynos_crtc->ops->disable_vblank(exynos_crtc); }
+void exynos_drm_crtc_wait_pending_update(struct exynos_drm_crtc *exynos_crtc) +{ + wait_event_timeout(exynos_crtc->wait_update, + (atomic_read(&exynos_crtc->pending_update) == 0), + msecs_to_jiffies(50)); +} + void exynos_drm_crtc_finish_update(struct exynos_drm_crtc *exynos_crtc, struct exynos_drm_plane *exynos_plane) { @@ -205,10 +211,12 @@ void exynos_drm_crtc_finish_update(struct exynos_drm_crtc *exynos_crtc,
exynos_plane->pending_fb = NULL;
+ if (atomic_dec_and_test(&exynos_crtc->pending_update)) + wake_up(&exynos_crtc->wait_update); + spin_lock_irqsave(&crtc->dev->event_lock, flags); if (exynos_crtc->event) { drm_crtc_send_vblank_event(crtc, exynos_crtc->event); - drm_crtc_vblank_put(crtc); wake_up(&exynos_crtc->pending_flip_queue); }
diff --git a/drivers/gpu/drm/exynos/exynos_drm_crtc.h b/drivers/gpu/drm/exynos/exynos_drm_crtc.h index 8bedfde..f87d4ab 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_crtc.h +++ b/drivers/gpu/drm/exynos/exynos_drm_crtc.h @@ -25,6 +25,7 @@ struct exynos_drm_crtc *exynos_drm_crtc_create(struct drm_device *drm_dev, void *context); int exynos_drm_crtc_enable_vblank(struct drm_device *dev, int pipe); void exynos_drm_crtc_disable_vblank(struct drm_device *dev, int pipe); +void exynos_drm_crtc_wait_pending_update(struct exynos_drm_crtc *exynos_crtc); void exynos_drm_crtc_finish_update(struct exynos_drm_crtc *exynos_crtc, struct exynos_drm_plane *exynos_plane); void exynos_drm_crtc_complete_scanout(struct drm_framebuffer *fb); diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.c b/drivers/gpu/drm/exynos/exynos_drm_drv.c index fc207f8..881f178 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_drv.c +++ b/drivers/gpu/drm/exynos/exynos_drm_drv.c @@ -45,11 +45,37 @@ struct exynos_atomic_commit { u32 crtcs; };
+static void exynos_atomic_wait_for_commit(struct drm_atomic_state *state) +{ + struct drm_crtc_state *crtc_state; + struct drm_crtc *crtc; + int i, ret; + + for_each_crtc_in_state(state, crtc, crtc_state, i) { + struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc); + + if (!crtc->state->enable) + continue; + + ret = drm_crtc_vblank_get(crtc); + if (ret) + continue; + + exynos_drm_crtc_wait_pending_update(exynos_crtc); + drm_crtc_vblank_put(crtc); + } +} + static void exynos_atomic_commit_complete(struct exynos_atomic_commit *commit) { struct drm_device *dev = commit->dev; struct exynos_drm_private *priv = dev->dev_private; struct drm_atomic_state *state = commit->state; + struct drm_plane *plane; + struct drm_crtc *crtc; + struct drm_plane_state *plane_state; + struct drm_crtc_state *crtc_state; + int i;
drm_atomic_helper_commit_modeset_disables(dev, state);
@@ -63,9 +89,25 @@ static void exynos_atomic_commit_complete(struct exynos_atomic_commit *commit) * have the relevant clocks enabled to perform the update. */
+ for_each_crtc_in_state(state, crtc, crtc_state, i) { + struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc); + + atomic_set(&exynos_crtc->pending_update, 0); + } + + for_each_plane_in_state(state, plane, plane_state, i) { + struct exynos_drm_crtc *exynos_crtc = + to_exynos_crtc(plane->crtc); + + if (!plane->crtc) + continue; + + atomic_inc(&exynos_crtc->pending_update); + } + drm_atomic_helper_commit_planes(dev, state);
- drm_atomic_helper_wait_for_vblanks(dev, state); + exynos_atomic_wait_for_commit(state);
drm_atomic_helper_cleanup_planes(dev, state);
diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.h b/drivers/gpu/drm/exynos/exynos_drm_drv.h index b06fbd4..7193d94 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_drv.h +++ b/drivers/gpu/drm/exynos/exynos_drm_drv.h @@ -136,6 +136,8 @@ struct exynos_drm_crtc_ops { * this pipe value. * @enabled: if the crtc is enabled or not * @event: vblank event that is currently queued for flip + * @wait_update: wait all pending planes updates to finish + * @pending_update: number of pending plane updates in this crtc * @ops: pointer to callbacks for exynos drm specific functionality * @ctx: A pointer to the crtc's implementation specific context */ @@ -145,6 +147,8 @@ struct exynos_drm_crtc { unsigned int pipe; wait_queue_head_t pending_flip_queue; struct drm_pending_vblank_event *event; + wait_queue_head_t wait_update; + atomic_t pending_update; const struct exynos_drm_crtc_ops *ops; void *ctx; };