[Intel-gfx] [PATCH 7/7] drm/i915/skl: Allow Y (and Yf) frame buffer creation

[shuang.he at intel.com]

Tested-By: PRC QA PRTS (Patch Regression Test System Contact: shuang.he at intel.com)
Task id: 5814
-------------------------------------Summary-------------------------------------
Platform          Delta          drm-intel-nightly          Series Applied
PNV                                  281/281              281/281
ILK                                  305/305              305/305
SNB                 -1              326/326              325/326
IVB                                  380/380              380/380
BYT                                  294/294              294/294
HSW                 -1              421/421              420/421
BDW                 -1              316/316              315/316
-------------------------------------Detailed-------------------------------------
Platform  Test                                drm-intel-nightly          Series Applied
 SNB  igt_kms_plane_plane-position-hole-pipe-B-plane-1      DMESG_WARN(12)PASS(3)      DMESG_WARN(1)PASS(1)
 HSW  igt_gem_storedw_loop_vebox      DMESG_WARN(2)PASS(1)      DMESG_WARN(1)PASS(1)
*BDW  igt_gem_gtt_hog      PASS(6)      DMESG_WARN(1)PASS(1)
Note: You need to pay more attention to line start with '*'