Boris Brezillon <boris.brezillon@xxxxxxxxxxxxxxxxxx> writes: > On Thu, 15 Jun 2017 16:33:11 -0700 > Eric Anholt <eric@xxxxxxxxxx> wrote: > >> Eric Anholt <eric@xxxxxxxxxx> writes: >> >> > [ Unknown signature status ] >> > Boris Brezillon <boris.brezillon@xxxxxxxxxxxxxxxxxx> writes: >> > >> >> On Tue, 06 Jun 2017 13:27:09 -0700 >> >> Eric Anholt <eric@xxxxxxxxxx> wrote: >> >> >> >>> Boris Brezillon <boris.brezillon@xxxxxxxxxxxxxxxxxx> writes: >> >>> >> >>> > The VC4 KMS driver is implementing its own ->atomic_commit() but there >> >>> > are a few generic helpers we can use instead of open-coding the logic. >> >>> > >> >>> > Signed-off-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxxxxxxx> >> >>> > --- >> >>> > drivers/gpu/drm/vc4/vc4_kms.c | 38 ++++++++++++-------------------------- >> >>> > 1 file changed, 12 insertions(+), 26 deletions(-) >> >>> > >> >>> > diff --git a/drivers/gpu/drm/vc4/vc4_kms.c b/drivers/gpu/drm/vc4/vc4_kms.c >> >>> > index ad7925a9e0ea..f229abc0991b 100644 >> >>> > --- a/drivers/gpu/drm/vc4/vc4_kms.c >> >>> > +++ b/drivers/gpu/drm/vc4/vc4_kms.c >> >>> > @@ -42,6 +42,10 @@ vc4_atomic_complete_commit(struct vc4_commit *c) >> >>> > struct drm_device *dev = state->dev; >> >>> > struct vc4_dev *vc4 = to_vc4_dev(dev); >> >>> > >> >>> > + drm_atomic_helper_wait_for_fences(dev, state, false); >> >>> > + >> >>> > + drm_atomic_helper_wait_for_dependencies(state); >> >>> >> >>> With this wait_for_fences() addition and the reservation stuff that >> >>> landed, I think we can rip out the "seqno cb" in vc4, and just use >> >>> drm_atomic_helper_commit() and drm_atomic_hepler_commit_tail(). Do you >> >>> see anything missing, with that? >> >> >> >> I can't tell. I haven't dig enough to understand what this seqno cb was >> >> used for :-), but Daniel was suggesting the same thing. I'll try to >> >> better understand what seqno cb does and if it's all safe to get rid of >> >> it and use the standard helpers. >> > >> > The seqno cb was the thing for stalling the modeset until V3D was done >> > rendering to the planes. The wait_for_fences() does the same thing >> > using generic dmabuf reservations, so the seqno cb isn't needed any >> > more. >> >> Oh, we've got another user of the seqno cb (async flips), anyway, so we >> can't delete it quite yet. I've pushed this patch since it's a clear >> improvement (less code, waits for fences from other devices if any). > > Ok. Did you fix the leak before applying? I don't think I see discussion of a leak. What are you referring to?
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