[Intel-gfx] [PATCH v2] drm/i915: add i915 specific connector debugfs file for DPCD

[shuang.he at intel.com]

Tested-By: PRC QA PRTS (Patch Regression Test System Contact: shuang.he at intel.com)
Task id: 6111
-------------------------------------Summary-------------------------------------
Platform          Delta          drm-intel-nightly          Series Applied
PNV                 -3              272/272              269/272
ILK                 -1              302/302              301/302
SNB                                  303/303              303/303
IVB                                  338/338              338/338
BYT                 -1              287/287              286/287
HSW                 -2              361/361              359/361
BDW                                  308/308              308/308
-------------------------------------Detailed-------------------------------------
Platform  Test                                drm-intel-nightly          Series Applied
 PNV  igt at gem_tiled_pread_pwrite      FAIL(3)PASS(3)      FAIL(1)PASS(1)
 PNV  igt at gem_userptr_blits@coherency-sync      CRASH(2)PASS(4)      CRASH(1)PASS(1)
 PNV  igt at gen3_render_tiledx_blits      FAIL(3)PASS(2)      FAIL(1)PASS(1)
*ILK  igt at drv_suspend@debugfs-reader      PASS(2)      DMESG_WARN(2)
(dmesg patch applied)drm:i915_dpcd_show[i915]]*ERROR*dpcd_read(#bytes_at#)failed(-#)@dpcd read .* bytes at .* failed
*BYT  igt at gem_exec_bad_domains@conflicting-write-domain      PASS(2)      FAIL(1)PASS(1)
*HSW  igt at gem_pwrite_pread@uncached-copy-performance      PASS(2)      DMESG_WARN(1)PASS(1)
(dmesg patch applied)drm:i915_hangcheck_elapsed[i915]]*ERROR*Hangcheck_timer_elapsed...blitter_ring_idle at Hangcheck timer elapsed... blitter ring idle
*HSW  igt at pm_rpm@debugfs-read      PASS(2)      DMESG_WARN(2)
(dmesg patch applied)drm:i915_dpcd_show[i915]]*ERROR*dpcd_read(#bytes_at#)failed(-#)@dpcd read .* bytes at .* failed
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