[Bug 69693] New: [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

          Priority: medium
            Bug ID: 69693
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [BYT]igt/kms_flip causes
                    [drm:intel_dp_complete_link_train] *ERROR* failed to
                    train DP, aborting
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: huax.lu at intel.com
          Hardware: All
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 86333
  --> https://bugs.freedesktop.org/attachment.cgi?id=86333&action=edit
dmesg

System Environment:
--------------------------
Platform:  Baytrail
Kernel: (drm-intel-nightly)565d170f33cc46ec4b33911c9302a506fe72fd60

Bug detailed description:
-----------------------------
Run ./kms_flip --run-subtest plain-flip on byt, It causes <3>[  537.365605]
[drm:intel_dp_complete_link_train] *ERROR* failed to train DP, aborting
It fails on Baytrail with -nightly kernel.
Many kms_flip subcase also fail.

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

Reproduce steps:
----------------------------
1../kms_flip --run-subtest plain-flip

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