[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 #34 from lu hua <huax.lu at intel.com> ---
It still happens on latest -nightly kernel.
run ./kms_flip  --run-subtest absolute-wf_vblank-interruptible

output:
IGT-Version: 1.7-gd0a41b4 (x86_64) (Linux:
3.17.0-rc2_drm-intel-nightly_519a43_20140829+ x86_64)
Using monotonic timestamps

Beginning absolute-wf_vblank-interruptible on crtc 8, connector 28
  1920x1080 60 1920 1966 1996 2080 1080 1082 1086 1112 0xa 0x48 138780
..............................................
absolute-wf_vblank-interruptible on crtc 8, connector 28: PASSED

Beginning absolute-wf_vblank-interruptible on crtc 13, connector 28
  1920x1080 60 1920 1966 1996 2080 1080 1082 1086 1112 0xa 0x48 138780
..............................................
absolute-wf_vblank-interruptible on crtc 13, connector 28: PASSED

Beginning absolute-wf_vblank-interruptible on crtc 8, connector 16
  1024x768 60 1024 1048 1184 1344 768 771 777 806 0xa 0x40 65000
..............................................
absolute-wf_vblank-interruptible on crtc 8, connector 16: PASSED

Beginning absolute-wf_vblank-interruptible on crtc 13, connector 16
  1024x768 60 1024 1048 1184 1344 768 771 777 806 0xa 0x40 65000
..............................................
absolute-wf_vblank-interruptible on crtc 13, connector 16: PASSED

Subtest absolute-wf_vblank-interruptible: SUCCESS


# dmesg -r|egrep "<[1-3]>"|grep drm
<3>[  235.727747] [drm:intel_dp_start_link_train] *ERROR* failed to enable link
training
<3>[  236.630574] [drm:intel_dp_complete_link_train] *ERROR* failed to train
DP, aborting
<3>[  236.632712] [drm:intel_pipe_config_compare] *ERROR* mismatch in
has_dp_encoder (expected 1, found 0)
<3>[  236.633414] [drm:i9xx_set_fifo_underrun_reporting] *ERROR* pipe B
underrun
<3>[  236.633418] [drm:valleyview_pipestat_irq_handler] *ERROR* pipe B underrun
<3>[  261.291479] [drm:intel_dp_start_link_train] *ERROR* failed to enable link
training
<3>[  262.176234] [drm:intel_dp_complete_link_train] *ERROR* failed to train
DP, aborting
<3>[  263.181448] [drm:intel_pipe_config_compare] *ERROR* mismatch in
has_dp_encoder (expected 1, found 0)
<3>[  263.182083] [drm:i9xx_set_fifo_underrun_reporting] *ERROR* pipe A
underrun
<3>[  263.182085] [drm:valleyview_pipestat_irq_handler] *ERROR* pipe A underrun

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