[Intel-gfx] [PATCH] drm/i915: Fix big cursors on snb

[shuang.he at intel.com]

Tested-By: PRC QA PRTS (Patch Regression Test System Contact: shuang.he at intel.com)
Task id: 5871
-------------------------------------Summary-------------------------------------
Platform          Delta          drm-intel-nightly          Series Applied
PNV                 -5              278/278              273/278
ILK                                  308/308              308/308
SNB                                  284/284              284/284
IVB                                  380/380              380/380
BYT                                  294/294              294/294
HSW                                  387/387              387/387
BDW                 -1              316/316              315/316
-------------------------------------Detailed-------------------------------------
Platform  Test                                drm-intel-nightly          Series Applied
*PNV  igt_gem_fence_thrash_bo-write-verify-none      PASS(5)      FAIL(1)NRUN(1)
*PNV  igt_gem_fence_thrash_bo-write-verify-x      PASS(5)      FAIL(1)NO_RESULT(1)
*PNV  igt_gem_fence_thrash_bo-write-verify-y      PASS(5)      FAIL(1)PASS(1)
 PNV  igt_gem_userptr_blits_coherency-sync      CRASH(5)PASS(7)      CRASH(2)
*PNV  igt_gem_userptr_blits_minor-unsync-interruptible      PASS(4)      DMESG_WARN(1)PASS(1)
*BDW  igt_gem_gtt_hog      PASS(15)      DMESG_WARN(1)PASS(1)
Note: You need to pay more attention to line start with '*'