[Intel-gfx] [PATCH] drm: Return current vblank value for drmWaitVBlank queries

[shuang.he at intel.com]

Tested-By: PRC QA PRTS (Patch Regression Test System Contact: shuang.he at intel.com)
Task id: 5987
-------------------------------------Summary-------------------------------------
Platform          Delta          drm-intel-nightly          Series Applied
PNV                 -2              268/268              266/268
ILK                 -1              303/303              302/303
SNB                                  283/283              283/283
IVB                                  343/343              343/343
BYT                                  287/287              287/287
HSW                                  363/363              363/363
BDW                                  308/308              308/308
-------------------------------------Detailed-------------------------------------
Platform  Test                                drm-intel-nightly          Series Applied
 PNV  igt_gem_userptr_blits_coherency-sync      CRASH(1)PASS(3)      CRASH(1)PASS(1)
 PNV  igt_gem_tiled_pread_pwrite      FAIL(1)PASS(3)      FAIL(1)PASS(1)
*ILK  igt_drv_suspend_forcewake      PASS(2)      DMESG_WARN(1)PASS(1)
Note: You need to pay more attention to line start with '*'