commit ff4f0254be575a264504687c407e0db2fd5573d7
author Naseer Ahmed <naseer@codeaurora.org> Mon Oct 01 13:03:01 2012 -0400
committer Iliyan Malchev <malchev@google.com> Tue Oct 02 16:54:14 2012 -0700
tree 3761425e9ced0beda7dc74999fc6cd9205f28194
parent 68b88cf211873e6f2cef0111c500697cd690266e

hwcomposer : Use sysfs to read vysnc information

* Read sysfs entries to get vsync timestamp from kernel.
* External display continues to use uevents for hotplug events
* A new thread, vsyncThread is created to read and send vsync
  timestamps to HAL.
* Disable H/W VSYNC for MDP 5.x targets until kernel changes are
  complete.
* Synchronization is needed to make sure read() is not called
by hwcVsyncThread when VSYNC is disabled.

Change-Id: Iab0a94a3cfce9142b8867859f2a7d9bcaecb0996
Acked-by:  Neti Ravi Kumar <ravineti@codeaurora.org>