[Bug 84074] [BYT]igt/kms_flip some subcases cause "WARNING: CPU: 0 PID: 4384 at drivers/gpu/drm/i915/intel_display.c:1746 valleyview_crtc_enable+0x9e4/0xaee [i915]()"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84074

--- Comment #2 from Guo Jinxian <jinxianx.guo at intel.com> ---
This failure is able to reproduce while running tests below:

igt/kms_flip/plain-flip
igt/kms_flip/wf_vblank-ts-check-interruptible


root at x-bytm02:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# ./kms_flip
--run-subtest wf_vblank-ts-check-interruptible
IGT-Version: 1.8-g5053446 (x86_64) (Linux:
3.17.0-rc5_drm-intel-nightly_3d788a_20140919+ x86_64)
Using monotonic timestamps
Beginning wf_vblank-ts-check-interruptible on crtc 8, connector 28
  1366x768 60 1366 1404 1426 1482 768 771 777 798 0xa 0x48 71000
..............................................
wf_vblank-ts-check-interruptible on crtc 8, connector 28: PASSED

Beginning wf_vblank-ts-check-interruptible on crtc 13, connector 28
  1366x768 60 1366 1404 1426 1482 768 771 777 798 0xa 0x48 71000
...Test assertion failure function check_state, file kms_flip.c:587:
Failed assertion: fabs((((double) diff.tv_usec) - usec_interflip) /
usec_interflip) <= 0.005
Last errno: 4, Interrupted system call
inter-vblank ts jitter: 0s, 987044us
Subtest wf_vblank-ts-check-interruptible: FAIL (21.058s)
root at x-bytm02:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# dmesg -r|egrep
"<[1-4]>"|grep drm
<3>[  484.453171] [drm:intel_dp_complete_link_train] *ERROR* failed to train
DP, aborting
<4>[  485.504061] WARNING: CPU: 1 PID: 4308 at
drivers/gpu/drm/i915/intel_display.c:1746 valleyview_crtc_enable+0x9e4/0xaee
[i915]()
<4>[  485.504068] Modules linked in: dm_mod snd_hda_codec_hdmi
snd_hda_codec_conexant iTCO_wdt iTCO_vendor_support snd_hda_codec_generic
snd_hda_intel snd_hda_controller pcspkr r8169 lpc_ich snd_hda_codec mfd_core
snd_hwdep i2c_i801 snd_pcm snd_timer snd soundcore iosf_mbi battery wmi ac
acpi_cpufreq uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core
v4l2_common videodev i915 button video drm_kms_helper drm cfbfillrect cfbimgblt
cfbcopyarea
<4>[  485.504109] CPU: 1 PID: 4308 Comm: kms_flip Tainted: G        W     
3.17.0-rc5_drm-intel-nightly_3d788a_20140919+ #2612
<4>[  485.504335]  [<ffffffffa0017fe5>] ?
drm_mode_set_config_internal+0x48/0xbd [drm]
<4>[  485.504349]  [<ffffffffa001ba0e>] ? drm_mode_setcrtc+0x3e6/0x48b [drm]
<4>[  485.504361]  [<ffffffffa001074c>] ? drm_ioctl+0x279/0x3bc [drm]
<4>[  485.504381]  [<ffffffffa001b628>] ? drm_mode_setplane+0x1ce/0x1ce [drm]
<3>[  486.857576] [drm:valleyview_pipestat_irq_handler] *ERROR* pipe B underrun
<3>[  492.413688] [drm:intel_dp_complete_link_train] *ERROR* failed to train
DP, aborting

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