Hi,
these are two patches against the nouveau kms driver. The first patch makes sure that pageflip completion events get their vblank count and timestamp from the drm. The second patch from Lucas Stach, here included with his permission, makes sure that the timestamps of vblanks are calculated with high precision and robustness. Both patches together make sure that all timestamps returned by the kms driver are consistent with each other and conform to the OML_sync_control specification.
With Lucas permission i've already integrated my feedback from reviewing his patch into the patch. The patches have been applied against Linux 3.2 and tested with special measurement equipment on a GeForce 7800, a GeForce 8800 and some QuadroFX 570 and 370. The timestamps are accurate to less than 30 usecs deviation from the ground truth measured with the external equipment.
I'll send out a couple of nouveau ddx patches that make use of these timestamps.
It would be great if these could be reviewed and possibly included for the Linux 3.4 merge window.
Thanks, -mario