[Intel-gfx] [PATCH 6/6] drm/i915/skl: Restore the DDI translation tables when enabling PW1

[shuang.he at intel.com]

Tested-By: PRC QA PRTS (Patch Regression Test System Contact: shuang.he at intel.com)
Task id: 5908
-------------------------------------Summary-------------------------------------
Platform          Delta          drm-intel-nightly          Series Applied
PNV                 -13              275/275              262/275
ILK                                  307/307              307/307
SNB                 -1              284/284              283/284
IVB                                  375/375              375/375
BYT                                  294/294              294/294
HSW                                  385/385              385/385
BDW                 -1              314/314              313/314
-------------------------------------Detailed-------------------------------------
Platform  Test                                drm-intel-nightly          Series Applied
*PNV  igt_gem_exec_params_DR1-dirt      PASS(2)      NRUN(1)PASS(1)
*PNV  igt_gem_exec_params_DR4-dirt      PASS(2)      NRUN(1)PASS(1)
*PNV  igt_gem_exec_params_no-bsd      PASS(2)      NRUN(1)PASS(1)
*PNV  igt_gem_exec_params_secure-non-master      PASS(2)      NRUN(1)PASS(1)
*PNV  igt_gem_exec_params_secure-non-root      PASS(2)      NRUN(1)PASS(1)
*PNV  igt_gem_fenced_exec_thrash_2-spare-fences      PASS(2)      NRUN(1)PASS(1)
*PNV  igt_gem_fenced_exec_thrash_no-spare-fences-busy-interruptible      PASS(2)      NRUN(1)PASS(1)
*PNV  igt_gem_fence_thrash_bo-copy      PASS(2)      FAIL(1)PASS(1)
*PNV  igt_gem_fence_thrash_bo-write-verify-y      PASS(4)      NRUN(1)PASS(1)
*PNV  igt_gem_flink_bad-flink      PASS(2)      NRUN(1)PASS(1)
*PNV  igt_gem_flink_flink-lifetime      PASS(2)      NRUN(1)PASS(1)
*PNV  igt_gem_flink_race_flink_close      PASS(2)      NRUN(1)PASS(1)
*PNV  igt_gem_gtt_cpu_tlb      PASS(2)      NRUN(1)PASS(1)
*SNB  igt_gem_exec_params_rel-constants-invalid-rel-gen5      PASS(2)      DMESG_WARN(1)PASS(1)
*BDW  igt_gem_gtt_hog      PASS(5)      DMESG_WARN(1)PASS(1)
Note: You need to pay more attention to line start with '*'