[Intel-gfx] [PATCH] drm/i915: Take runtime pm reference on hangcheck_info

[shuang.he at intel.com]

Tested-By: PRC QA PRTS (Patch Regression Test System Contact: shuang.he at intel.com)
Task id: 5723
-------------------------------------Summary-------------------------------------
Platform          Delta          drm-intel-nightly          Series Applied
PNV                 -2              282/283              280/283
ILK                                  316/319              316/319
SNB                                  322/346              322/346
IVB                                  382/384              382/384
BYT                                  296/296              296/296
HSW              +1-1              425/428              425/428
BDW                                  318/333              318/333
-------------------------------------Detailed-------------------------------------
Platform  Test                                drm-intel-nightly          Series Applied
 PNV  igt_gen3_render_linear_blits      FAIL(3, M7)CRASH(1, M23)PASS(4, M25M23)      FAIL(1, M7)
 PNV  igt_gen3_render_mixed_blits      FAIL(3, M7)PASS(1, M23)      FAIL(1, M7)
 PNV  igt_gem_tiled_pread_pwrite      FAIL(2, M7)PASS(1, M23)      FAIL(1, M7)
*HSW  igt_gem_pwrite_pread_uncached-copy-performance      PASS(2, M20)      DMESG_WARN(1, M20)
*HSW  igt_pm_rpm_debugfs-read      DMESG_WARN(3, M20)      PASS(1, M20)
Note: You need to pay more attention to line start with '*'