[Intel-gfx] [PATCH 2/2] drm/i915: Don't assume primary & cursor are always on for wm calculation

[shuang.he at intel.com]

Tested-By: PRC QA PRTS (Patch Regression Test System Contact: shuang.he at intel.com)
Task id: 5883
-------------------------------------Summary-------------------------------------
Platform          Delta          drm-intel-nightly          Series Applied
PNV                 -8              278/278              270/278
ILK                                  308/308              308/308
SNB                 -1              284/284              283/284
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_userptr_blits_coherency-sync      NO_RESULT(1)CRASH(8)NRUN(1)PASS(8)      CRASH(1)PASS(1)
 PNV  igt_gem_userptr_blits_coherency-unsync      FAIL(1)NO_RESULT(1)CRASH(6)PASS(7)      CRASH(1)PASS(1)
*PNV  igt_gem_userptr_blits_forbidden-operations      PASS(2)      NRUN(1)PASS(1)
*PNV  igt_gem_userptr_blits_forked-access      PASS(2)      NRUN(1)PASS(1)
*PNV  igt_gem_userptr_blits_forked-sync-interruptible      PASS(2)      NRUN(1)PASS(1)
 PNV  igt_gen3_render_linear_blits      FAIL(6)NRUN(1)DMESG_WARN(1)PASS(9)      FAIL(2)
 PNV  igt_gen3_render_mixed_blits      FAIL(10)PASS(9)      FAIL(2)
 PNV  igt_gem_fence_thrash_bo-write-verify-threaded-none      FAIL(2)CRASH(5)PASS(7)      CRASH(2)
*SNB  igt_gem_flink_bad-flink      PASS(3)      DMESG_WARN(1)PASS(1)
*BDW  igt_gem_gtt_hog      PASS(19)      DMESG_WARN(1)PASS(1)
Note: You need to pay more attention to line start with '*'