[Intel-gfx] [PATCH v3] drm/i915: avoid processing spurious/shared interrupts in low-power states

[shuang.he at intel.com]

Tested-By: PRC QA PRTS (Patch Regression Test System Contact: shuang.he at intel.com)
Task id: 5812
-------------------------------------Summary-------------------------------------
Platform          Delta          drm-intel-nightly          Series Applied
PNV                 -2              281/281              279/281
ILK                                  308/308              308/308
SNB                                  326/326              326/326
IVB                                  380/380              380/380
BYT                                  294/294              294/294
HSW                                  421/421              421/421
BDW                 -1              316/316              315/316
-------------------------------------Detailed-------------------------------------
Platform  Test                                drm-intel-nightly          Series Applied
*PNV  igt_gem_userptr_blits_minor-unsync-interruptible      PASS(2)      DMESG_WARN(1)PASS(1)
 PNV  igt_gem_userptr_blits_minor-unsync-normal      DMESG_WARN(1)PASS(1)      DMESG_WARN(1)PASS(1)
*BDW  igt_gem_gtt_hog      PASS(5)      DMESG_WARN(1)PASS(1)
Note: You need to pay more attention to line start with '*'