From: Gustavo Padovan <gustavo.padovan@xxxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxx>
---
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 7a2ad3e..049ab67 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_crtc.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_crtc.c
@@ -74,10 +74,7 @@ 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);
@@ -154,6 +151,8 @@ 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;
@@ -195,6 +194,13 @@ 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)
{
@@ -203,10 +209,12 @@ 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 a4937b5..241453f 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_drv.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_drv.c
@@ -46,11 +46,37 @@ 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);
@@ -64,9 +90,25 @@ 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 406b278..d77dca4 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;
};
--
2.1.0
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