[Intel-gfx] [PATCH v2] drm/i915: Optimistically spin for the request completion

[shuang.he at intel.com]

Tested-By: PRC QA PRTS (Patch Regression Test System Contact: shuang.he at intel.com)
Task id: 5934
-------------------------------------Summary-------------------------------------
Platform          Delta          drm-intel-nightly          Series Applied
PNV                 -9              281/281              272/281
ILK                 -1              308/308              307/308
SNB                 -1              284/284              283/284
IVB                                  375/375              375/375
BYT                                  294/294              294/294
HSW                                  384/384              384/384
BDW                                  315/315              315/315
-------------------------------------Detailed-------------------------------------
Platform  Test                                drm-intel-nightly          Series Applied
*PNV  igt_gem_fence_thrash_bo-write-verify-none      PASS(2)      FAIL(1)NRUN(1)
*PNV  igt_gem_fence_thrash_bo-write-verify-x      PASS(2)      FAIL(1)NO_RESULT(1)
*PNV  igt_gem_fence_thrash_bo-write-verify-y      PASS(2)      FAIL(1)NO_RESULT(1)
 PNV  igt_gem_userptr_blits_coherency-sync      CRASH(4)PASS(2)      CRASH(1)PASS(1)
 PNV  igt_gen3_render_linear_blits      FAIL(2)PASS(1)      FAIL(1)PASS(1)
*PNV  igt_gen3_render_mixed_blits      FAIL(1)PASS(2)      FAIL(1)NO_RESULT(1)
 PNV  igt_gen3_render_tiledx_blits      FAIL(3)PASS(1)      FAIL(1)PASS(1)
 PNV  igt_gen3_render_tiledy_blits      FAIL(4)PASS(1)      FAIL(1)PASS(1)
 PNV  igt_gem_fence_thrash_bo-write-verify-threaded-none      CRASH(1)PASS(4)      CRASH(1)PASS(1)
*ILK  igt_kms_flip_wf_vblank-ts-check      PASS(2)      DMESG_WARN(1)PASS(1)
*SNB  igt_gem_fenced_exec_thrash_too-many-fences      PASS(4)      DMESG_WARN(1)PASS(1)
Note: You need to pay more attention to line start with '*'