[Bug 76987] New: [BYT Regression]Some subcases of igt/kms_flip timeout

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=76987

          Priority: medium
            Bug ID: 76987
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [BYT Regression]Some subcases of igt/kms_flip timeout
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: jinxianx.guo at intel.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 96830
  --> https://bugs.freedesktop.org/attachment.cgi?id=96830&action=edit
dmesg about some subcase of kms_flip timeout

System Environment:
--------------------------
Platform: BYT
kernel:   (drm-intel-nightly)b2f42c87ceb21108f04b17b651ad1f7c6e808f79

Bug detailed description:
----------------------------
Some subcases of igt/kms_flip timeout, and Call trace in dmesg.

Subcase list:
igt/kms_flip/bcs-flip-vs-panning
igt/kms_flip/bcs-wf_vblank-vs-modeset-interruptible
igt/kms_flip/flip-vs-modeset-interruptible
igt/kms_flip/flip-vs-panning
igt/kms_flip/nonexisting-fb-interruptible
igt/kms_flip/rcs-wf_vblank-vs-modeset

output on -nightly kernel:
[root at x-byt06 tests]# ./kms_flip --run-subtest flip-vs-modeset-interruptible
IGT-Version: 1.6-gb8afe98 (x86_64) (Linux:
3.14.0_drm-intel-nightly_b2f42c_20140403+ x86_64)
Using monotonic timestamps
Beginning flip-vs-modeset-interruptible on crtc 5, connector 23

  1920x1080 60 1920 1966 1996 2080 1080 1082 1086 1112 0xa 0x48 138780
.
............


Call Trace:
----------------------------
[  301.219888] WARNING: CPU: 0 PID: 4 at drivers/gpu/drm/i915/intel_dp.c:488
intel_dp_aux_ch+0x54f/0x5ae [i915]()
[  301.219891] dp_aux_ch not started status 0xffffffff
[  301.219893] Modules linked in: ip6table_filter ip6_tables iptable_filter
ip_tables ebtable_nat ebtables x_tables ipv6 dm_mod snd_hda_codec_hdmi
snd_hda_codec_realtek snd_hda_codec_generic pcspkr serio_raw snd_hda_intel
snd_hda_codec snd_hwdep snd_pcm snd_timer snd soundcore battery ac acpi_cpufreq
i915 video button drm_kms_helper drm
[  301.219921] CPU: 0 PID: 4 Comm: kworker/0:0 Tainted: G        W   
3.14.0_drm-intel-nightly_b2f42c_20140403+ #1294
[  301.219940] Workqueue: events i915_hotplug_work_func [i915]
[  301.219943]  0000000000000000 0000000000000009 ffffffff81717233
ffff8800767afb68
[  301.219948]  ffffffff81035052 ffffffff831bf0c0 ffffffffa00b47d1
ffffffff831bf0c0
[  301.219953]  ffff880002b798d0 ffff88000299c000 0000000000000000
00000000ffffffff
[  301.219958] Call Trace:
[  301.219965]  [<ffffffff81717233>] ? dump_stack+0x41/0x51
[  301.219970]  [<ffffffff81035052>] ? warn_slowpath_common+0x73/0x8b
[  301.219990]  [<ffffffffa00b47d1>] ? intel_dp_aux_ch+0x54f/0x5ae [i915]
[  301.219996]  [<ffffffff81035102>] ? warn_slowpath_fmt+0x45/0x4a
[  301.220016]  [<ffffffffa008f233>] ? vlv_read32+0xe3/0xee [i915]
[  301.220036]  [<ffffffffa00b47d1>] ? intel_dp_aux_ch+0x54f/0x5ae [i915]
[  301.220041]  [<ffffffff81713f40>] ? printk+0x4f/0x54
[  301.220047]  [<ffffffff8103cd2e>] ? lock_timer_base.isra.28+0x22/0x46
[  301.220066]  [<ffffffffa00b4933>] ? intel_dp_aux_transfer+0x103/0x10f [i915]
[  301.220071]  [<ffffffff8103d0a6>] ? del_timer_sync+0x21/0x3e
[  301.220077]  [<ffffffff817196b9>] ? schedule_timeout+0x151/0x16d
[  301.220084]  [<ffffffffa0048a60>] ? drm_dp_dpcd_access+0x4f/0xc7
[drm_kms_helper]
[  301.220091]  [<ffffffffa0048b55>] ? drm_dp_dpcd_read+0x14/0x19
[drm_kms_helper]
[  301.220111]  [<ffffffffa00b2e93>] ? intel_dp_dpcd_read_wake+0x2e/0x58 [i915]
[  301.220131]  [<ffffffffa00b4f70>] ? intel_dp_detect+0x183/0x280 [i915]
[  301.220150]  [<ffffffffa00868e2>] ? i915_hotplug_work_func+0x209/0x2b2
[i915]
[  301.220155]  [<ffffffff81046660>] ? process_one_work+0x1bc/0x2ed
[  301.220160]  [<ffffffff81046bce>] ? worker_thread+0x1c7/0x2bc
[  301.220165]  [<ffffffff81046a07>] ? rescuer_thread+0x251/0x251
[  301.220170]  [<ffffffff8104b53e>] ? kthread+0xc5/0xcd
[  301.220176]  [<ffffffff8104b479>] ? kthread_freezable_should_stop+0x40/0x40
[  301.220181]  [<ffffffff817217fc>] ? ret_from_fork+0x7c/0xb0
[  301.220187]  [<ffffffff8104b479>] ? kthread_freezable_should_stop+0x40/0x40
[  301.220190] ---[ end trace 49b28aaaac806e4a ]---


Reproduce steps:
---------------------------- 
1.  ./kms_flip --run-subtest flip-vs-modeset-interruptible

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