[Intel-gfx] [PATCH 2/2] drm/i915: eDP DRRS limited to only one panel at a time

[shuang.he at intel.com]

Tested-By: PRC QA PRTS (Patch Regression Test System Contact: shuang.he at intel.com)
Task id: 6031
-------------------------------------Summary-------------------------------------
Platform          Delta          drm-intel-nightly          Series Applied
PNV                 -2              275/275              273/275
ILK                 -1              303/303              302/303
SNB                                  304/304              304/304
IVB                                  339/339              339/339
BYT                                  287/287              287/287
HSW                                  361/361              361/361
BDW                                  310/310              310/310
-------------------------------------Detailed-------------------------------------
Platform  Test                                drm-intel-nightly          Series Applied
*PNV  igt at gem_userptr_blits@minor-sync-interruptible      PASS(3)      DMESG_WARN(1)PASS(1)
*PNV  igt at gem_userptr_blits@minor-unsync-normal      PASS(2)      DMESG_WARN(2)
*ILK  igt at gem_unfence_active_buffers      PASS(2)      DMESG_WARN(2)
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