[Bug 69693] [BYT]igt/kms_flip causes [drm:intel_dp_complete_link_train] *ERROR* failed to train DP, aborting

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=69693

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |NEW

--- Comment #3 from lu hua <huax.lu at intel.com> ---
Test on -nightly(24c8329416b54b79655afe45370cf3d46f41e283), It randomly causes
system hang.It happens 3 in 5 cycles.
output:
Using monotonic timestamps
Beginning plain-flip on crtc 3, connector 16
  1920x1080 60 1920 1966 1996 2080 1080 1082 1086 1112 0xa 0x48 138780
.....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
plain-flip on crtc 3, connector 16: PASSED

Beginning plain-flip on crtc 6, connector 16
  1920x1080 60 1920 1966 1996 2080 1080 1082 1086 1112 0xa 0x48 138780
.....................................................................................................................................................................................................................................................................................................................................................................................................................................unexpected
flip seq 422, should be >= 423
Subtest plain-flip: FAIL
DPMS property not found on 16

dmesg:
[  127.059316] [drm:intel_dp_complete_link_train] *ERROR* failed to train DP,
aborting
[  127.059318] [drm:intel_dp_link_down],
[  127.110743] [drm:ironlake_wait_for_vblank], vblank wait timed out
[  128.163737] ------------[ cut here ]------------
[  128.163817] WARNING: CPU: 0 PID: 3474 at
drivers/gpu/drm/i915/intel_display.c:1479 vlv_pre_enable_dp+0x112/0x121
[i915]()
[  128.163822] timed out waiting for port C ready: 0xf00020ff
[  128.163882] Modules linked in: ip6table_filter ip6_tables ipv6
iptable_filter ip_tables ebtable_nat ebtables x_tables dm_mod
snd_hda_codec_realtek serio_raw pcspkr snd_hda_intel snd_hda_codec snd_hwdep
snd_pcm snd_page_alloc snd_timer snd soundcore battery ac acpi_cpufreq i915
video button drm_kms_helper drm freq_table
[  128.163886] CPU: 0 PID: 3474 Comm: kms_flip Not tainted
3.12.0-rc2_nightlytop_24c832_20130926_+ #286
[  128.163890]  0000000000000000 0000000000000009 ffffffff817041c4
ffff880073d85848
[  128.163893]  ffffffff8103319e 0000000000000282 ffffffffa009b1ff
dead000000200200
[  128.163895]  ffff88006ff44000 0000000000000000 0000000000000001
ffff880004d11800
[  128.163896] Call Trace:
[  128.163904]  [<ffffffff817041c4>] ? dump_stack+0x41/0x51
[  128.163910]  [<ffffffff8103319e>] ? warn_slowpath_common+0x73/0x8b
[  128.163926]  [<ffffffffa009b1ff>] ? vlv_pre_enable_dp+0x112/0x121 [i915]
[  128.163930]  [<ffffffff8103324e>] ? warn_slowpath_fmt+0x45/0x4a
[  128.163946]  [<ffffffffa0084d45>] ? vlv_wait_port_ready+0xc9/0xfc [i915]
[  128.163962]  [<ffffffffa009b1ff>] ? vlv_pre_enable_dp+0x112/0x121 [i915]
[  128.163977]  [<ffffffffa00854ac>] ? valleyview_crtc_enable+0x2b8/0x395
[i915]
[  128.163993]  [<ffffffffa008b0f5>] ? __intel_set_mode+0xfbc/0x10c7 [i915]
[  128.163998]  [<ffffffff810635b9>] ? console_trylock+0xf/0x47
[  128.164014]  [<ffffffffa008ca94>] ? intel_set_mode+0xd/0x27 [i915]
[  128.164029]  [<ffffffffa008d0df>] ? intel_crtc_set_config+0x631/0x838 [i915]
[  128.164034]  [<ffffffff812c719b>] ? cpumask_next_and+0x2b/0x3b
[  128.164045]  [<ffffffffa000f4a8>] ? drm_mode_set_config_internal+0x44/0xac
[drm]
[  128.164050]  [<ffffffffa0048c6e>] ? drm_fb_helper_set_par+0x55/0x9a
[drm_kms_helper]
[  128.164055]  [<ffffffff812f94f6>] ? fb_set_var+0x246/0x32c
[  128.164059]  [<ffffffff8130333d>] ? fbcon_blank+0x71/0x230
[  128.164064]  [<ffffffff81352368>] ? do_unblank_screen+0xef/0x169
[  128.164068]  [<ffffffff8134a798>] ? vt_ioctl+0x4af/0xf87
[  128.164072]  [<ffffffff810e68ce>] ? path_openat+0x22d/0x5b9
[  128.164075]  [<ffffffff81342f1d>] ? tty_ioctl+0x8b4/0x923
[  128.164078]  [<ffffffff810e6f26>] ? do_filp_open+0x2b/0x6f
[  128.164080]  [<ffffffff810e81f2>] ? vfs_ioctl+0x1e/0x31
[  128.164083]  [<ffffffff810e89c8>] ? do_vfs_ioctl+0x3ad/0x3ef
[  128.164087]  [<ffffffff810f0382>] ? __fd_install+0x15/0x39
[  128.164090]  [<ffffffff810e8a58>] ? SyS_ioctl+0x4e/0x7e
[  128.164093]  [<ffffffff8170e722>] ? system_call_fastpath+0x16/0x1b
[  128.164095] ---[ end trace d48407b80d740924 ]---

It fails 2 in 5 runs.
output:
Using monotonic timestamps
Beginning plain-flip on crtc 3, connector 16
  1920x1080 60 1920 1966 1996 2080 1080 1082 1086 1112 0xa 0x48 138780
.......................unexpected flip seq 23, should be >= 24
Subtest plain-flip: FAIL

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