Hi all, this patch set for the kernel pushes the latency sensitive bits of vblank scanoutpos timestamping from the drm core into the kms drivers. A change in the locking of the intel-kms driver for Linux 3.11 made the old approach too inaccurate and also incompatible with the PREEMPT_RT realtime kernel patch set. These patches fix that problem and restore the old level of precision and reliability. The patch set changes the prototype of driver->get_scanout_position() to require/allow kms drivers to perform the ktime_get() system time queries which go along with actual scanout position readout in a way that provides maximum precision and to return those timestamps to the drm. It also converts the only two kms drivers which use this api so far (intel-kms and radeon-kms) to the new api and improves precision and reliability of the intel-kms a lot. Patches have been tested on Intel and AMD Radeon hardware and the Intel bits have received some review and feedback by Ville Syrjälä. Please review and apply if possible. Thanks, -mario _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
