[Intel-gfx] [PATCH 4/4] drm/i915: Changes required to enable DSI Video Mode on CHT

[shuang.he at intel.com]

Tested-By: Intel Graphics QA PRTS (Patch Regression Test System Contact: shuang.he at intel.com)
Task id: 6391
-------------------------------------Summary-------------------------------------
Platform          Delta          drm-intel-nightly          Series Applied
PNV                 -3              272/272              269/272
ILK                 -1              302/302              301/302
SNB                 -1              315/315              314/315
IVB                                  343/343              343/343
BYT                                  287/287              287/287
BDW                                  317/317              317/317
-------------------------------------Detailed-------------------------------------
Platform  Test                                drm-intel-nightly          Series Applied
*PNV  igt at gem_tiled_pread_pwrite      PASS(3)      FAIL(1)
*PNV  igt at gem_userptr_blits@coherency-sync      PASS(3)      CRASH(1)
*PNV  igt at gem_userptr_blits@coherency-unsync      PASS(3)      CRASH(1)
*ILK  igt at kms_flip@flip-vs-dpms-interruptible      PASS(2)      DMESG_WARN(1)
(dmesg patch applied)drm:intel_pch_fifo_underrun_irq_handler[i915]]*ERROR*PCH_transcoder_A_FIFO_underrun at PCH transcoder A FIFO underrun
 SNB  igt at pm_rpm@dpms-mode-unset-non-lpsp      DMESG_WARN(7)PASS(1)      DMESG_WARN(1)
(dmesg patch applied)WARNING:at_drivers/gpu/drm/i915/intel_uncore.c:#assert_device_not_suspended[i915]()@WARNING:.* at .* assert_device_not_suspended+0x
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