[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 #24 from lu hua <huax.lu at intel.com> ---
Created attachment 102179
  --> https://bugs.freedesktop.org/attachment.cgi?id=102179&action=edit
dmesg(patch)

Applay Todd's patch.
root at x-byt06:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# ./kms_flip 
--run-subtest absolute-wf_vblank-interruptible
IGT-Version: 1.7-g67e29a3 (x86_64) (Linux: 3.16.0-rc2_kcloud_dc05ed_20140703+
x86_64)
Using monotonic timestamps
Beginning absolute-wf_vblank-interruptible on crtc 6, connector 25
  1920x1080 60 1920 1966 1996 2080 1080 1082 1086 1112 0xa 0x48 138780
...........................................................................................
absolute-wf_vblank-interruptible on crtc 6, connector 25: PASSED

Beginning absolute-wf_vblank-interruptible on crtc 11, connector 25
  1920x1080 60 1920 1966 1996 2080 1080 1082 1086 1112 0xa 0x48 138780
................................................................................................................................................................................
absolute-wf_vblank-interruptible on crtc 11, connector 25: PASSED

Subtest absolute-wf_vblank-interruptible: SUCCESS
root at x-byt06:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# dmesg -r | egrep
"<[1-3]>" |grep drm
<3>[   66.649840] [drm:intel_pipe_config_compare] *ERROR* mismatch in
has_dp_encoder (expected 1, found 0)
<3>[   66.657152] [drm:valleyview_pipestat_irq_handler] *ERROR* pipe B underrun
<3>[   83.791251] [drm:intel_pipe_config_compare] *ERROR* mismatch in
has_dp_encoder (expected 1, found 0)
<3>[   83.791896] [drm:valleyview_pipestat_irq_handler] *ERROR* pipe A underrun

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