[Bug 69693] [BYT]igt/kms_flip causes [drm:intel_dp_complete_link_train] *ERROR* failed to train DP, aborting

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=69693

--- Comment #1 from lu hua <huax.lu at intel.com> ---
Run the 1st cysle, output shows success, It causes <3>[  537.365605]
[drm:intel_dp_complete_link_train] *ERROR* failed to train DP, aborting appears
in dmesg.
output(the first cycle):
Using monotonic timestamps
Beginning plain-flip on crtc 3, connector 16
  1920x1080 60 1920 1966 1996 2080 1080 1082 1086 1112 0xa 0x48 138780
.................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
plain-flip on crtc 3, connector 16: PASSED

Beginning plain-flip on crtc 6, connector 16
  1920x1080 60 1920 1966 1996 2080 1080 1082 1086 1112 0xa 0x48 138780
..................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
plain-flip on crtc 6, connector 16: PASSED

Subtest plain-flip: SUCCESS

Run the 2nd cycle, output shows fail, and it will not exit. If run reboot,
system is no response.
output:
Using monotonic timestamps
Beginning plain-flip on crtc 3, connector 16
  1920x1080 60 1920 1966 1996 2080 1080 1082 1086 1112 0xa 0x48 138780
select timed out or error (ret 0)
Subtest plain-flip: FAIL
DPMS property not found on 16

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