[Intel-gfx] [PATCH 3/3] drm/i915: Read HDMI EDID only when required

[shuang.he at intel.com]

Tested-By: Intel Graphics QA PRTS (Patch Regression Test System Contact: shuang.he at intel.com)
Task id: 6674
-------------------------------------Summary-------------------------------------
Platform          Delta          drm-intel-nightly          Series Applied
ILK                 -1              302/302              301/302
SNB                                  312/316              312/316
IVB                                  343/343              343/343
BYT                                  289/289              289/289
HSW                                  380/380              380/380
-------------------------------------Detailed-------------------------------------
Platform  Test                                drm-intel-nightly          Series Applied
*ILK  igt at kms_flip@flip-vs-rmfb-interruptible      PASS(1)      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
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