[Intel-gfx] [PATCH 12/12] drm/i915: Enable the maxfifo PM5 mode when appropriate on CHV

[shuang.he at intel.com]

Tested-By: PRC QA PRTS (Patch Regression Test System Contact: shuang.he at intel.com)
Task id: 5748
-------------------------------------Summary-------------------------------------
Platform          Delta          drm-intel-nightly          Series Applied
PNV              +3                 275/283              278/283
ILK              +1-2              310/315              309/315
SNB              +3                 320/346              323/346
IVB                 -1              380/384              379/384
BYT                                  296/296              296/296
HSW              +3                 422/428              425/428
BDW                                  318/333              318/333
-------------------------------------Detailed-------------------------------------
Platform  Test                                drm-intel-nightly          Series Applied
 PNV  igt_gem_userptr_blits_coherency-sync      CRASH(3, M7)PASS(2, M7)      PASS(1, M7)
 PNV  igt_gem_userptr_blits_coherency-unsync      CRASH(3, M7)PASS(3, M7)      PASS(1, M7)
 PNV  igt_gem_userptr_blits_create-destroy-sync      NRUN(1, M7)PASS(5, M7)      PASS(1, M7)
 PNV  igt_gen3_render_tiledx_blits      FAIL(2, M7)TIMEOUT(1, M7)PASS(3, M7)      FAIL(1, M7)
 ILK  igt_gem_fenced_exec_thrash_no-spare-fences-busy-interruptible      DMESG_WARN(1, M26)PASS(1, M26)      DMESG_WARN(1, M26)
*ILK  igt_gem_unfence_active_buffers      PASS(3, M26)      DMESG_WARN(1, M26)
*ILK  igt_drv_suspend_forcewake      DMESG_WARN(3, M26)      PASS(1, M26)
*SNB  igt_kms_flip_bo-too-big      BLACKLIST(1, M35)      PASS(1, M35)
*SNB  igt_kms_flip_bo-too-big-interruptible      BLACKLIST(1, M35)      PASS(1, M35)
*SNB  igt_kms_flip_event_leak      NSPT(5, M35)      PASS(1, M35)
 IVB  igt_gem_storedw_batches_loop_normal      DMESG_WARN(1, M4)PASS(4, M4)      DMESG_WARN(1, M4)
*HSW  igt_kms_flip_bo-too-big      BLACKLIST(1, M40)      PASS(1, M40)
*HSW  igt_kms_flip_bo-too-big-interruptible      BLACKLIST(1, M40)      PASS(1, M40)
 HSW  igt_kms_flip_plain-flip-fb-recreate-interruptible      TIMEOUT(5, M40)PASS(2, M40)      PASS(1, M40)
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