diff options
| author | Daniel Vetter <daniel.vetter@ffwll.ch> | 2021-01-21 16:29:52 +0100 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2021-02-23 12:54:20 +0100 |
| commit | 53fc08c23a323884d11b178d12ce55043690eb0f (patch) | |
| tree | a6e6b9df5cb889afc57cba682f551776cf8be39b /drivers/gpu/drm/arm | |
| parent | 9e5eb5e1b60a547067c2b305461c71d1c2f2bffa (diff) | |
drm/komeda: Annotate dma-fence critical section in commit path
Like the helpers, nothing special. Well except not, because we the
critical section extends until after hw_done(), since that's the last
thing which could hold up a subsequent atomic commit. That means the
wait_for_flip_done is included, but that's not a problem, we're
allowed to call dma_fence_wait() from signalling critical sections.
Even on our own fence (which this does), it's just a bit confusing.
But in a way those last 2 function calls are already part of the fence
signalling critical section for the next atomic commit.
Reading this I'm wondering why komeda waits for flip_done() before
calling hw_done(), which is a bit backwards (but hey hw can be
special). Might be good to throw a comment in there that explains why,
because the original commit that added this just doesn't.
v2: Small rebase
Reviewed-by: James Qian Wang <james.qian.wang@arm.com> (v1)
Cc: "James (Qian) Wang" <james.qian.wang@arm.com>
Cc: Liviu Dudau <liviu.dudau@arm.com>
Cc: Mihail Atanassov <mihail.atanassov@arm.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210121152959.1725404-5-daniel.vetter@ffwll.ch
Diffstat (limited to 'drivers/gpu/drm/arm')
| -rw-r--r-- | drivers/gpu/drm/arm/display/komeda/komeda_kms.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_kms.c b/drivers/gpu/drm/arm/display/komeda/komeda_kms.c index 034ee08482e0..aeda4e5ec4f4 100644 --- a/drivers/gpu/drm/arm/display/komeda/komeda_kms.c +++ b/drivers/gpu/drm/arm/display/komeda/komeda_kms.c @@ -73,6 +73,7 @@ static const struct drm_driver komeda_kms_driver = { static void komeda_kms_commit_tail(struct drm_atomic_state *old_state) { struct drm_device *dev = old_state->dev; + bool fence_cookie = dma_fence_begin_signalling(); drm_atomic_helper_commit_modeset_disables(dev, old_state); @@ -85,6 +86,8 @@ static void komeda_kms_commit_tail(struct drm_atomic_state *old_state) drm_atomic_helper_wait_for_flip_done(dev, old_state); + dma_fence_end_signalling(fence_cookie); + drm_atomic_helper_cleanup_planes(dev, old_state); } |