[Intel-gfx] [PATCH 7/7] drm/i915: Enable PSR by default.

[shuang.he at intel.com]

Tested-By: PRC QA PRTS (Patch Regression Test System Contact: shuang.he at intel.com)
Task id: 5865
-------------------------------------Summary-------------------------------------
Platform          Delta          drm-intel-nightly          Series Applied
PNV                 -5              278/278              273/278
ILK                 -8              308/308              300/308
SNB                 -1              284/284              283/284
IVB                                  380/380              380/380
BYT                                  294/294              294/294
HSW                 -1              387/387              386/387
BDW                 -2              316/316              314/316
-------------------------------------Detailed-------------------------------------
Platform  Test                                drm-intel-nightly          Series Applied
 PNV  igt_gem_userptr_blits_coherency-sync      CRASH(3)PASS(6)      CRASH(2)
 PNV  igt_gem_userptr_blits_coherency-unsync      CRASH(2)PASS(5)      CRASH(2)
*PNV  igt_gem_userptr_blits_minor-unsync-interruptible      PASS(4)      DMESG_WARN(1)PASS(1)
 PNV  igt_gen3_render_linear_blits      FAIL(3)PASS(5)      FAIL(2)
 PNV  igt_gen3_render_mixed_blits      FAIL(2)PASS(8)      FAIL(2)
*ILK  igt_gem_bad_length      PASS(2)      DMESG_WARN(1)PASS(1)
*ILK  igt_gem_exec_params_no-blt      PASS(2)      DMESG_WARN(1)PASS(1)
*ILK  igt_gem_exec_params_sol-reset-not-gen7      PASS(2)      DMESG_WARN(1)PASS(1)
*ILK  igt_gem_reloc_overflow_source-offset-negative-reloc-cpu      PASS(2)      DMESG_WARN(2)
*ILK  igt_gem_reloc_overflow_source-offset-negative-reloc-gtt      PASS(2)      DMESG_WARN(1)PASS(1)
*ILK  igt_gem_seqno_wrap      PASS(2)      DMESG_WARN(1)PASS(1)
 ILK  igt_gem_unfence_active_buffers      DMESG_WARN(1)PASS(2)      DMESG_WARN(1)PASS(1)
*ILK  igt_kms_addfb_small-bo      PASS(2)      DMESG_WARN(1)PASS(1)
*SNB  igt_gem_flink_bad-open      PASS(4)      DMESG_WARN(1)PASS(1)
*HSW  igt_gem_storedw_loop_blt      PASS(3)      DMESG_WARN(1)PASS(1)
*BDW  igt_gem_gtt_hog      PASS(12)      TIMEOUT(1)PASS(1)
*BDW  igt_gem_ringfill_blitter-interruptible      PASS(2)      NO_RESULT(1)PASS(1)
Note: You need to pay more attention to line start with '*'