[Intel-gfx] [PATCH 3/3] drm/i915: Do only one posting read on forcewake get sequence

[shuang.he at intel.com]

Tested-By: PRC QA PRTS (Patch Regression Test System Contact: shuang.he at intel.com)
Task id: 5674
-------------------------------------Summary-------------------------------------
Platform          Delta          drm-intel-nightly          Series Applied
PNV                                  353/353              353/353
ILK                 -2              353/353              351/353
SNB              +1                 400/422              401/422
IVB                                  485/487              485/487
BYT                                  296/296              296/296
HSW              +1-2              507/508              506/508
BDW                                  401/402              401/402
-------------------------------------Detailed-------------------------------------
Platform  Test                                drm-intel-nightly          Series Applied
*ILK  igt_drv_suspend_debugfs-reader      PASS(2, M26)      DMESG_WARN(1, M26)
*ILK  igt_gem_workarounds_suspend-resume      PASS(2, M26)      DMESG_WARN(1, M26)
*SNB  igt_kms_flip_event_leak      NSPT(5, M35M22)      PASS(1, M35)
 HSW  igt_gem_pwrite_pread_snooped-pwrite-blt-cpu_mmap-performance      DMESG_WARN(1, M40)PASS(18, M40M20)      PASS(1, M20)
*HSW  igt_gem_storedw_loop_bsd      PASS(2, M40M20)      DMESG_WARN(1, M20)
 HSW  igt_gem_storedw_loop_vebox      DMESG_WARN(2, M20)PASS(3, M40M20)      DMESG_WARN(1, M20)
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