As per the docs, atomic_commit should return -EBUSY "if an asycnhronous
updated is requested and there is an earlier updated pending".
v2: Use the status of the workqueue instead of vop->event, and don't add
a superfluous wait on the workqueue.
v3: Drop work_busy, as there's a sizeable delay when the worker
finishes, which introduces a race in which the client has already
received the last flip event but the next page flip ioctl will still
return -EBUSY because work_busy returns outdated information.
v4: Hold dev->event_lock while checking the VOP's event field as
suggested by Daniel Stone.
Signed-off-by: Tomeu Vizoso <tomeu.vizoso@xxxxxxxxxxxxx>
---
drivers/gpu/drm/rockchip/rockchip_drm_drv.h | 1 +
drivers/gpu/drm/rockchip/rockchip_drm_fb.c | 19 ++++++++++++++++++-
drivers/gpu/drm/rockchip/rockchip_drm_vop.c | 6 ++++++
3 files changed, 25 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.h b/drivers/gpu/drm/rockchip/rockchip_drm_drv.h
index 00d17d71aa4c..02ed8b78c939 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.h
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.h
@@ -70,6 +70,7 @@ int rockchip_register_crtc_funcs(struct drm_crtc *crtc,
void rockchip_unregister_crtc_funcs(struct drm_crtc *crtc);
int rockchip_drm_crtc_mode_config(struct drm_crtc *crtc, int connector_type,
int out_mode);
+bool rockchip_drm_crtc_has_pending_event(struct drm_crtc *crtc);
int rockchip_drm_dma_attach_device(struct drm_device *drm_dev,
struct device *dev);
void rockchip_drm_dma_detach_device(struct drm_device *drm_dev,
diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_fb.c b/drivers/gpu/drm/rockchip/rockchip_drm_fb.c
index 3b8f652698f8..45cdc2859364 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_fb.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_fb.c
@@ -280,7 +280,24 @@ int rockchip_drm_atomic_commit(struct drm_device *dev,
{
struct rockchip_drm_private *private = dev->dev_private;
struct rockchip_atomic_commit *commit = &private->commit;
- int ret;
+ struct drm_crtc_state *crtc_state;
+ struct drm_crtc *crtc;
+ unsigned long flags;
+ int i, ret;
+
+ if (async) {
+ for_each_crtc_in_state(state, crtc, crtc_state, i) {
+ spin_lock_irqsave(&dev->event_lock, flags);
+
+ if (crtc->state->event ||
+ rockchip_drm_crtc_has_pending_event(crtc)) {
+ spin_unlock_irqrestore(&dev->event_lock, flags);
+ return -EBUSY;
+ }
+
+ spin_unlock_irqrestore(&dev->event_lock, flags);
+ }
+ }
ret = drm_atomic_helper_prepare_planes(dev, state);
if (ret)
diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
index a619f120f801..82e6f145f7a2 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
@@ -850,6 +850,12 @@ int rockchip_drm_crtc_mode_config(struct drm_crtc *crtc,
}
EXPORT_SYMBOL_GPL(rockchip_drm_crtc_mode_config);
+bool rockchip_drm_crtc_has_pending_event(struct drm_crtc *crtc)
+{
+ assert_spin_locked(&crtc->dev->event_lock);
+ return to_vop(crtc)->event;
+}
+
static int vop_crtc_enable_vblank(struct drm_crtc *crtc)
{
struct vop *vop = to_vop(crtc);
--
2.5.5
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