[Intel-gfx] [PATCH 18/18] drm/i915: BDW cdclk change support

[shuang.he at intel.com]

Tested-By: PRC QA PRTS (Patch Regression Test System Contact: shuang.he at intel.com)
-------------------------------------Summary-------------------------------------
Platform: baseline_drm_intel_nightly_pass_rate->patch_applied_pass_rate
BYT: pass/total=290/291->290/291
PNV: pass/total=356/356->355/356
ILK: pass/total=371/372->367/372
IVB: pass/total=545/546->545/546
SNB: pass/total=370/370->370/370
HSW: pass/total=581/581->579/581
BDW: pass/total=432/435->432/435
-------------------------------------Detailed-------------------------------------
test_platform: test_suite, test_case, result_with_drm_intel_nightly(count, machine_id...)...->result_with_patch_applied(count, machine_id)...
PNV: Intel_gpu_tools, igt_kms_sysfs_edid_timing, PASS(4, M7M23) -> FAIL(1, M23)PASS(3, M23)
ILK: Intel_gpu_tools, igt_kms_flip_flip-vs-modeset-vs-hang, PASS(4, M37M26) -> DMESG_WARN(1, M26)PASS(3, M26)
ILK: Intel_gpu_tools, igt_kms_flip_flip-vs-modeset-vs-hang-interruptible, DMESG_WARN(1, M26)PASS(3, M37M26) -> DMESG_WARN(1, M26)PASS(3, M26)
ILK: Intel_gpu_tools, igt_kms_flip_plain-flip, PASS(4, M37M26) -> DMESG_WARN(1, M26)PASS(3, M26)
ILK: Intel_gpu_tools, igt_kms_flip_wf_vblank-vs-modeset-interruptible, DMESG_WARN(1, M26)PASS(3, M37M26) -> DMESG_WARN(1, M26)PASS(3, M26)
HSW: Intel_gpu_tools, igt_pm_rpm_cursor-dpms, DMESG_WARN(3, M40)PASS(1, M40) -> DMESG_WARN(1, M40)PASS(3, M40)
HSW: Intel_gpu_tools, igt_pm_rpm_dpms-mode-unset-non-lpsp, DMESG_WARN(3, M40)PASS(1, M40) -> DMESG_WARN(1, M40)PASS(3, M40)