[Intel-gfx] [PATCH v2] 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: 5809
-------------------------------------Summary-------------------------------------
Platform          Delta          drm-intel-nightly          Series Applied
PNV                 -1              281/281              280/281
ILK                                  308/308              308/308
SNB                 -2              326/326              324/326
IVB                                  380/380              380/380
BYT                                  294/294              294/294
HSW                 -3              421/421              418/421
BDW                 -1              316/316              315/316
-------------------------------------Detailed-------------------------------------
Platform  Test                                drm-intel-nightly          Series Applied
*PNV  igt_gen3_render_mixed_blits      PASS(3)      CRASH(1)PASS(1)
*SNB  igt_kms_plane_plane-position-hole-pipe-B-plane-2      DMESG_WARN(12)PASS(2)      TIMEOUT(1)PASS(1)
*SNB  igt_kms_rotation_crc_sprite-rotation      DMESG_WARN(11)PASS(3)      FAIL(1)PASS(1)
*HSW  igt_gem_pwrite_pread_snooped-pwrite-blt-cpu_mmap-performance      PASS(3)      DMESG_WARN(1)PASS(1)
 HSW  igt_gem_storedw_loop_vebox      DMESG_WARN(1)PASS(1)      DMESG_WARN(1)PASS(1)
*HSW  igt_kms_flip_plain-flip-fb-recreate-interruptible      PASS(2)      TIMEOUT(2)
*BDW  igt_gem_gtt_hog      PASS(2)      DMESG_WARN(1)PASS(1)
Note: You need to pay more attention to line start with '*'