[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

lu hua <huax.lu at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|major                       |critical

--- Comment #36 from lu hua <huax.lu at intel.com> ---
Test on latest -nightly kernel, many kms_flip sub cases randomly has this
issue:
igt/kms_flip/bcs-flip-vs-modeset
igt/kms_flip/bcs-flip-vs-modeset-interruptible
igt/kms_flip/bcs-wf_vblank-vs-dpms
igt/kms_flip/bcs-wf_vblank-vs-dpms-interruptible
igt/kms_flip/bcs-wf_vblank-vs-modeset
igt/kms_flip/bcs-wf_vblank-vs-modeset-interruptible
igt/kms_flip/bo-too-big
igt/kms_flip/bo-too-big-interruptible
igt/kms_flip/flip-vs-dpms-off-vs-modeset
igt/kms_flip/flip-vs-dpms-off-vs-modeset-interruptible
igt/kms_flip/flip-vs-expired-vblank
igt/kms_flip/rcs-flip-vs-dpms
igt/kms_flip/rcs-flip-vs-dpms-interruptible
igt/kms_flip/rcs-flip-vs-modeset
igt/kms_flip/rcs-flip-vs-modeset-interruptible
igt/kms_flip/rcs-flip-vs-panning
igt/kms_flip/rcs-flip-vs-panning-interruptible
igt/kms_flip/rcs-wf_vblank-vs-dpms
igt/kms_flip/rcs-wf_vblank-vs-dpms-interruptible
igt/kms_flip/rcs-wf_vblank-vs-modeset
igt/kms_flip/rcs-wf_vblank-vs-modeset-interruptible

run ./kms_flip --run-subtest bcs-flip-vs-modeset
dmesg:
[ 1275.022998] [drm:intel_dp_complete_link_train] *ERROR* failed to train DP,
aborting
[ 1276.056699] [drm:edp_panel_vdd_off_sync] Turning eDP VDD off
[ 1276.056707] [drm:edp_panel_vdd_off_sync] PP_STATUS: 0x80000008 PP_CONTROL:
0xabcd0003
[ 1276.073848] ------------[ cut here ]------------
[ 1276.073887] WARNING: CPU: 1 PID: 5003 at
drivers/gpu/drm/i915/intel_display.c:1748 valleyview_crtc_enable+0x9cb/0xad2
[i915]()
[ 1276.073891] timed out waiting for port C ready: 0x0000201f
[ 1276.073893] Modules linked in: dm_mod snd_hda_codec_hdmi iTCO_wdt
iTCO_vendor_support snd_hda_codec_conexant snd_hda_codec_generic pcspkr r8169
snd_hda_intel snd_hda_controller snd_hda_codec i2c_i801 snd_hwdep lpc_ich
snd_pcm mfd_core 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
[ 1276.073933] CPU: 1 PID: 5003 Comm: kms_flip Not tainted
3.17.0_drm-intel-nightly_ea4bec_20141009+ #326
[ 1276.073937]  0000000000000000 0000000000000009 ffffffff8178032c
ffff880002bbbab8
[ 1276.073942]  ffffffff8103a8ec dead000000200200 ffffffffa00c9725
0000000000000246
[ 1276.073948]  ffff8800791a8000 0000000000186018 ffff88017a45db30
00000000f0006000
[ 1276.073953] Call Trace:
[ 1276.073964]  [<ffffffff8178032c>] ? dump_stack+0x41/0x51
[ 1276.073972]  [<ffffffff8103a8ec>] ? warn_slowpath_common+0x78/0x90
[ 1276.073999]  [<ffffffffa00c9725>] ? valleyview_crtc_enable+0x9cb/0xad2
[i915]
[ 1276.074005]  [<ffffffff8103a99c>] ? warn_slowpath_fmt+0x45/0x4a
[ 1276.074032]  [<ffffffffa00c4af0>] ? vlv_wait_port_ready+0xdc/0x114 [i915]
[ 1276.074059]  [<ffffffffa00c9725>] ? valleyview_crtc_enable+0x9cb/0xad2
[i915]
[ 1276.074086]  [<ffffffffa00cc182>] ? __intel_set_mode+0x1115/0x121d [i915]
[ 1276.074092]  [<ffffffff8177d404>] ? printk+0x4f/0x54
[ 1276.074119]  [<ffffffffa00ce448>] ? intel_set_mode+0xd/0x27 [i915]
[ 1276.074147]  [<ffffffffa00cf05b>] ? intel_crtc_set_config+0x757/0xa99 [i915]
[ 1276.074163]  [<ffffffffa0017fe9>] ? drm_mode_set_config_internal+0x48/0xbd
[drm]
[ 1276.074176]  [<ffffffffa001ba12>] ? drm_mode_setcrtc+0x3e6/0x48b [drm]
[ 1276.074188]  [<ffffffffa0010760>] ? drm_ioctl+0x279/0x3bc [drm]
[ 1276.074202]  [<ffffffffa001b62c>] ? drm_mode_setplane+0x1ce/0x1ce [drm]
[ 1276.074208]  [<ffffffff81108374>] ? kmem_cache_free+0xf7/0x135
[ 1276.074215]  [<ffffffff8111cda3>] ? do_vfs_ioctl+0x3ec/0x435
[ 1276.074221]  [<ffffffff8104e66d>] ? task_work_run+0x78/0x87
[ 1276.074226]  [<ffffffff8111ce35>] ? SyS_ioctl+0x49/0x78
[ 1276.074232]  [<ffffffff8178601a>] ? int_signal+0x12/0x17
[ 1276.074237]  [<ffffffff81785d92>] ? system_call_fastpath+0x16/0x1b
[ 1276.074241] ---[ end trace d5b4ab87e33aca0d ]---

Increasing priority, It impacts so many sub cases and the result is unstable.

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