[Intel-gfx] [PATCH 4/4] drm/i915: Simplify pll state commit by swapping new and old state

[shuang.he at intel.com]

Tested-By: PRC QA PRTS (Patch Regression Test System Contact: shuang.he at intel.com)
Task id: 5683
-------------------------------------Summary-------------------------------------
Platform          Delta          drm-intel-nightly          Series Applied
PNV                                  353/353              353/353
ILK                                  353/353              353/353
SNB                                  400/422              400/422
IVB              +1                 485/487              486/487
BYT                                  296/296              296/296
HSW              +1-11              404/405              394/405
BDW                 -1              401/402              400/402
-------------------------------------Detailed-------------------------------------
Platform  Test                                drm-intel-nightly          Series Applied
 IVB  igt_gem_storedw_batches_loop_normal      DMESG_WARN(5, M34M4)PASS(15, M34M4M21)      PASS(1, M21)
*HSW  igt_gem_pwrite_pread_display-copy-performance      PASS(5, M40M20)      DMESG_WARN(1, M40)
 HSW  igt_gem_pwrite_pread_snooped-pwrite-blt-cpu_mmap-performance      DMESG_WARN(1, M40)PASS(18, M40M20)      PASS(1, M40)
*HSW  igt_kms_cursor_crc_cursor-size-change      PASS(2, M40)      TIMEOUT(1, M40)
*HSW  igt_kms_fence_pin_leak      PASS(2, M40)      TIMEOUT(1, M40)
*HSW  igt_kms_flip_bo-too-big      PASS(2, M40)      TIMEOUT(1, M40)
*HSW  igt_kms_flip_bo-too-big-interruptible      PASS(2, M40)      CRASH(1, M40)
*HSW  igt_kms_flip_dpms-vs-vblank-race      PASS(2, M40)      TIMEOUT(1, M40)
*HSW  igt_kms_flip_event_leak      PASS(2, M40)      TIMEOUT(1, M40)
*HSW  igt_kms_flip_flip-vs-dpms-off-vs-modeset      PASS(2, M40)      TIMEOUT(1, M40)
*HSW  igt_kms_flip_flip-vs-expired-vblank      PASS(2, M40)      TIMEOUT(1, M40)
*HSW  igt_kms_flip_flip-vs-expired-vblank-interruptible      PASS(2, M40)      CRASH(1, M40)
*HSW  igt_kms_flip_nonexisting-fb      PASS(3, M40M20)      TIMEOUT(1, M40)
*BDW  igt_kms_fence_pin_leak      PASS(2, M30)      TIMEOUT(1, M30)
Note: You need to pay more attention to line start with '*'