[Intel-gfx] [PATCH] drm/i915: vlv: fix IRQ masking when

[shuang.he at intel.com]

Tested-By: PRC QA PRTS (Patch Regression Test System Contact: shuang.he at intel.com)
-------------------------------------Summary-------------------------------------
Platform          Delta          drm-intel-nightly          Series Applied
PNV                                  367/367              367/367
ILK              +2                 373/375              375/375
SNB                 -1              450/450              449/450
IVB                 -2              503/503              501/503
BYT                                  289/289              289/289
HSW                 -3              567/567              564/567
BDW                                  417/417              417/417
-------------------------------------Detailed-------------------------------------
Platform  Test                                drm-intel-nightly          Series Applied
ILK  igt_kms_flip_flip-vs-panning      NSPT(1, M26)      PASS(2, M37)
ILK  igt_kms_flip_nonexisting-fb      DMESG_WARN(1, M26)      PASS(2, M37)
SNB  igt_kms_rotation_crc_sprite-rotation      PASS(1, M35)      DMESG_WARN(1, M22)PASS(1, M22)
IVB  igt_gem_bad_reloc_negative-reloc      PASS(1, M21)      NSPT(2, M21)
IVB  igt_gem_bad_reloc_negative-reloc-lut      PASS(1, M21)      NSPT(1, M21)PASS(1, M21)
HSW  igt_gem_bad_reloc_negative-reloc-lut      PASS(1, M19)      NSPT(2, M40)
HSW  igt_kms_rotation_crc_primary-rotation      PASS(1, M19)      DMESG_WARN(1, M40)PASS(1, M40)
HSW  igt_pm_rc6_residency_rc6-accuracy      PASS(1, M19)      FAIL(1, M40)PASS(1, M40)