From: Robert Foss robert.foss@collabora.com
As per the docs, atomic_commit should return -EBUSY "if an asycnhronous update is requested and there is an earlier update pending".
Signed-off-by: Robert Foss robert.foss@collabora.com --- drivers/gpu/drm/vc4/vc4_crtc.c | 6 ++++++ drivers/gpu/drm/vc4/vc4_drv.h | 1 + drivers/gpu/drm/vc4/vc4_kms.c | 20 ++++++++++++++++++-- 3 files changed, 25 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/vc4/vc4_crtc.c b/drivers/gpu/drm/vc4/vc4_crtc.c index 355ee4b..43193a3 100644 --- a/drivers/gpu/drm/vc4/vc4_crtc.c +++ b/drivers/gpu/drm/vc4/vc4_crtc.c @@ -802,3 +802,9 @@ struct platform_driver vc4_crtc_driver = { .of_match_table = vc4_crtc_dt_match, }, }; + +bool vc4_crtc_has_pending_event(struct drm_crtc *crtc) +{ + assert_spin_locked(&crtc->dev->event_lock); + return to_vc4_crtc(crtc)->event; +} diff --git a/drivers/gpu/drm/vc4/vc4_drv.h b/drivers/gpu/drm/vc4/vc4_drv.h index fa2ad15..54c1fb5 100644 --- a/drivers/gpu/drm/vc4/vc4_drv.h +++ b/drivers/gpu/drm/vc4/vc4_drv.h @@ -414,6 +414,7 @@ extern struct platform_driver vc4_crtc_driver; int vc4_enable_vblank(struct drm_device *dev, unsigned int crtc_id); void vc4_disable_vblank(struct drm_device *dev, unsigned int crtc_id); int vc4_crtc_debugfs_regs(struct seq_file *m, void *arg); +bool vc4_crtc_has_pending_event(struct drm_crtc *crtc);
/* vc4_debugfs.c */ int vc4_debugfs_init(struct drm_minor *minor); diff --git a/drivers/gpu/drm/vc4/vc4_kms.c b/drivers/gpu/drm/vc4/vc4_kms.c index 4718ae5..dc157a1e 100644 --- a/drivers/gpu/drm/vc4/vc4_kms.c +++ b/drivers/gpu/drm/vc4/vc4_kms.c @@ -107,10 +107,26 @@ static int vc4_atomic_commit(struct drm_device *dev, bool async) { struct vc4_dev *vc4 = to_vc4_dev(dev); - int ret; - int i; uint64_t wait_seqno = 0; struct vc4_commit *c; + 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 || + vc4_crtc_has_pending_event(crtc)) { + spin_unlock_irqrestore(&dev->event_lock, flags); + return -EBUSY; + } + spin_unlock_irqrestore(&dev->event_lock, flags); + } + }
c = commit_init(state); if (!c)