[Intel-gfx] [PATCH] drm/i915: More cautious with pch fifo underruns

[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                 -12              375/375              363/375
SNB                                  450/450              450/450
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_gem_reset_stats_close-pending-fork-render      TIMEOUT(9, M37M26)PASS(1, M26)      TIMEOUT(1, M26)
*ILK  igt_kms_3d      PASS(3, M37M26)      DMESG_WARN(1, M26)
 ILK  igt_kms_flip_nonexisting-fb      DMESG_WARN(2, M26)PASS(3, M37M26)      DMESG_WARN(1, M26)
*ILK  igt_kms_flip_rcs-wf_vblank-vs-modeset      PASS(2, M37M26)      DMESG_WARN(1, M26)
 ILK  igt_kms_flip_blocking-absolute-wf_vblank-interruptible      DMESG_WARN(2, M26)PASS(2, M37M26)      DMESG_WARN(1, M26)
 ILK  igt_kms_flip_flip-vs-dpms      DMESG_WARN(1, M26)PASS(4, M37M26)      DMESG_WARN(1, M26)
 ILK  igt_kms_flip_flip-vs-rmfb-interruptible      DMESG_WARN(1, M26)PASS(2, M37M26)      DMESG_WARN(1, M26)
 ILK  igt_kms_flip_plain-flip      DMESG_WARN(1, M26)PASS(2, M37M26)      DMESG_WARN(1, M26)
*ILK  igt_kms_flip_rcs-flip-vs-modeset-interruptible      PASS(3, M37M26)      DMESG_WARN(1, M26)
 ILK  igt_kms_flip_vblank-vs-hang      TIMEOUT(9, M37M26)PASS(1, M26)      TIMEOUT(1, M26)
*ILK  igt_kms_flip_wf_vblank-ts-check      PASS(3, M37M26)      DMESG_WARN(1, M26)
 ILK  igt_kms_flip_wf_vblank-ts-check-interruptible      DMESG_WARN(1, M26)PASS(3, M37M26)      DMESG_WARN(1, M26)
 IVB  igt_gem_bad_reloc_negative-reloc      NSPT(14, M34M21M4)PASS(1, M21)      NSPT(1, M4)
 IVB  igt_gem_bad_reloc_negative-reloc-lut      NSPT(3, M21M34M4)PASS(15, M21M34M4)      NSPT(1, M4)
 HSW  igt_gem_bad_reloc_negative-reloc-lut      NSPT(24, M40M20M19)PASS(1, M20)      NSPT(1, M19)
*HSW  igt_kms_rotation_crc_primary-rotation      PASS(23, M20M40M19)      DMESG_WARN(1, M19)
*HSW  igt_pm_rc6_residency_rc6-accuracy      PASS(25, M20M40M19)      FAIL(1, M19)
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