[PATCH 1/3] drm: Send pending vblank events before disabling vblank.

Jesse Barnes jbarnes at virtuousgeek.org
Thu Apr 28 13:46:30 PDT 2011

On Thu, 28 Apr 2011 18:09:58 +1000
Christopher James Halse Rogers <christopher.halse.rogers at canonical.com>
> Ok.  This appears to be surprisingly difficult.  Particularly, the
> vblank code indexes crtcs based on the driver-private numbering, and
> there doesn't appear to be a generic interface to grab this number;
> Intel uses the DRM_IOCTL_I915_GET_PIPE_FROM_CRTC_ID ioctl, radeon uses
> something different.
> I'll see what I can come up with, but I don't think I'm sufficiently
> familiar with the kms code to quickly come up with a nice API.

Yeah, unfortunately the vblank code pre-dates the KMS code by quite a
bit, so the IDs don't match.

But with the events emitted as in your previous patch, this should be a
harder case to hit, but it sounds like we need to make sure the flip
waits are dealt with too to avoid this from triggering at all on
Intel.  Or did you see other cases where the refcount was nonzero at
this point?

Jesse Barnes, Intel Open Source Technology Center

More information about the dri-devel mailing list