[Bug 73037] [BYT]igt/many kms_flip subcases randomly fail with *ERROR* failed to train DP, aborting

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=73037

--- Comment #21 from lu hua <huax.lu at intel.com> ---
Created attachment 101717
  --> https://bugs.freedesktop.org/attachment.cgi?id=101717&action=edit
dmesg

It still happens on latest -nightly kernel.

# ./kms_flip
IGT-Version: 1.7-gfedb9b6 (x86_64) (Linux:
3.16.0-rc2_drm-intel-nightly_891f8a_20140625+ x86_64)
Using monotonic timestamps
Beginning wf_vblank on crtc 6, connector 25
  1920x1080 60 1920 1966 1996 2080 1080 1082 1086 1112 0xa 0x48 138780
..........................................................................................
wf_vblank on crtc 6, connector 25: PASSED

Beginning wf_vblank on crtc 11, connector 25
  1920x1080 60 1920 1966 1996 2080 1080 1082 1086 1112 0xa 0x48 138780
......................................................................^C

# dmesg -r | egrep "<[1-3]>" |grep drm
<3>[   94.616157] [drm:intel_dp_start_link_train] *ERROR* failed to enable link
training
<3>[   95.504899] [drm:intel_dp_complete_link_train] *ERROR* failed to train
DP, aborting
<3>[   95.507159] [drm:intel_pipe_config_compare] *ERROR* mismatch in
has_dp_encoder (expected 1, found 0)
<3>[   95.507835] [drm:i9xx_set_fifo_underrun_reporting] *ERROR* pipe B
underrun
<3>[   95.507839] [drm:valleyview_pipestat_irq_handler] *ERROR* pipe B underrun
<3>[  107.666500] [drm:intel_dp_start_link_train] *ERROR* failed to enable link
training
<3>[  108.789734] [drm:intel_dp_complete_link_train] *ERROR* failed to train
DP, aborting
<3>[  109.794928] [drm:intel_pipe_config_compare] *ERROR* mismatch in
has_dp_encoder (expected 1, found 0)
<3>[  109.795557] [drm:valleyview_pipestat_irq_handler] *ERROR* pipe A underrun

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