[Bug 80701] New: [BYT Regression]igt/kms_flip subcases cause "WARNING: CPU: 0 PID: 3943 at drivers/gpu/drm/i915/intel_dp.c:3092 intel_dp_complete_link_train+0x100/0x27f [i915]()" sporadically

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Sun Jun 29 22:55:10 PDT 2014 

https://bugs.freedesktop.org/show_bug.cgi?id=80701

          Priority: high
            Bug ID: 80701
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [BYT Regression]igt/kms_flip subcases cause "WARNING:
                    CPU: 0 PID: 3943 at
                    drivers/gpu/drm/i915/intel_dp.c:3092
                    intel_dp_complete_link_train+0x100/0x27f [i915]()"
                    sporadically
        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 101995
  --> https://bugs.freedesktop.org/attachment.cgi?id=101995&action=edit
dmesg

==System Environment==
--------------------------
Regression: Yes. 
The fail rate is about 1 out of 3
Good commit on -fixes：223a6f2b975ab35d93270ea1d4fb6e0ac6b27fe6

Non-working platforms: BYT

==kernel==
--------------------------
origin/drm-intel-nightly: 1087d4bf01e79523898c6c31615bf0c369e0039a(fails)
    drm-intel-nightly: 2014y-06m-25d-13h-11m-05s integration manifest
origin/drm-intel-next-queued: 91565c85b66db820f01894a971d39aaef60c4325(works)
    drm/i915: Don't try to look up object for non-existent fb    
origin/drm-intel-fixes: 8525a235c96a548873c6c5644f50df32b31f04c6(fails)
    drm/i915: vlv_prepare_pll is only needed in case of non DSI interfaces

==Bug detailed description==
-----------------------------
igt/kms_flip subcases cause "WARNING: CPU: 0 PID: 3943 at
drivers/gpu/drm/i915/intel_dp.c:3092 intel_dp_complete_link_train+0x100/0x27f
[i915]()" sporadically 

Case list:
igt/kms_flip/absolute-wf_vblank
igt/kms_flip/absolute-wf_vblank-interruptible
igt/kms_flip/bcs-flip-vs-dpms
igt/kms_flip/bcs-flip-vs-modeset-interruptible
igt/kms_flip/bcs-flip-vs-panning
igt/kms_flip/bcs-flip-vs-panning-interruptible
igt/kms_flip/bcs-wf_vblank-vs-modeset
igt/kms_flip/bcs-wf_vblank-vs-modeset-interruptible
igt/kms_flip/blocking-absolute-wf_vblank
igt/kms_flip/blocking-absolute-wf_vblank-interruptible
igt/kms_flip/blocking-wf_vblank
igt/kms_flip/bo-too-big
igt/kms_flip/bo-too-big-interruptible
igt/kms_flip/busy-flip
igt/kms_flip/busy-flip-interruptible
igt/kms_flip/dpms-off-confusion
igt/kms_flip/dpms-off-confusion-interruptible
igt/kms_flip/dpms-vs-vblank-race
igt/kms_flip/flip-vs-absolute-wf_vblank
igt/kms_flip/flip-vs-absolute-wf_vblank-interruptible
igt/kms_flip/flip-vs-blocking-wf-vblank
igt/kms_flip/flip-vs-dpms
igt/kms_flip/flip-vs-dpms-interruptible
igt/kms_flip/flip-vs-dpms-off-vs-modeset-interruptible
igt/kms_flip/flip-vs-expired-vblank
igt/kms_flip/flip-vs-expired-vblank-interruptible
igt/kms_flip/flip-vs-fences
igt/kms_flip/flip-vs-fences-interruptible
igt/kms_flip/flip-vs-modeset-interruptible
igt/kms_flip/flip-vs-modeset-vs-hang
igt/kms_flip/flip-vs-modeset-vs-hang-interruptible
igt/kms_flip/flip-vs-panning
igt/kms_flip/flip-vs-panning-interruptible
igt/kms_flip/flip-vs-panning-vs-hang
igt/kms_flip/flip-vs-panning-vs-hang-interruptible
igt/kms_flip/flip-vs-rmfb
igt/kms_flip/flip-vs-rmfb-interruptible
igt/kms_flip/flip-vs-wf_vblank
igt/kms_flip/flip-vs-wf_vblank-interruptible
igt/kms_flip/modeset-vs-vblank-race
igt/kms_flip/nonexisting-fb
igt/kms_flip/nonexisting-fb-interruptible
igt/kms_flip/plain-flip
igt/kms_flip/plain-flip-fb-recreate
igt/kms_flip/plain-flip-fb-recreate-interruptible
igt/kms_flip/plain-flip-interruptible
igt/kms_flip/plain-flip-ts-check
igt/kms_flip/plain-flip-ts-check-interruptible
igt/kms_flip/rcs-flip-vs-dpms
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-modeset
igt/kms_flip/rcs-wf_vblank-vs-modeset-interruptible
igt/kms_flip/single-buffer-flip-vs-dpms-off-vs-modeset-interruptible

Output:
root at x-byt06:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests#  ./kms_flip
--run-subtest plain-flip-fb-recreate-interruptible
IGT-Version: 1.7-g67e29a3 (x86_64) (Linux:
3.16.0-rc2_drm-intel-fixes_8525a2_20140630+ x86_64)
Using monotonic timestamps
Beginning plain-flip-fb-recreate-interruptible on crtc 5, connector 23
  1920x1080 60 1920 1966 1996 2080 1080 1082 1086 1112 0xa 0x48 138780
.....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
plain-flip-fb-recreate-interruptible on crtc 5, connector 23: PASSED

Beginning plain-flip-fb-recreate-interruptible on crtc 9, connector 23
  1920x1080 60 1920 1966 1996 2080 1080 1082 1086 1112 0xa 0x48 138780
.....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
plain-flip-fb-recreate-interruptible on crtc 9, connector 23: PASSED

Subtest plain-flip-fb-recreate-interruptible: SUCCESS

Dmesg shows:
[  155.408801] WARNING: CPU: 0 PID: 3943 at
drivers/gpu/drm/i915/intel_dp.c:3092 intel_dp_complete_link_train+0x100/0x27f
[i915]()
[  155.408820] Modules linked in: dm_mod snd_hda_codec_hdmi
snd_hda_codec_realtek snd_hda_codec_generic iTCO_wdt iTCO_vendor_support pcspkr
serio_raw lpc_ich i2c_i801 mfd_core snd_hda_intel snd_hda_controller
snd_hda_codec snd_hwdep snd_pcm snd_timer snd soundcore iosf_mbi battery ac
acpi_cpufreq i915 video button drm_kms_helper drm
[  155.408850] CPU: 0 PID: 3943 Comm: kms_flip Tainted: G        W    
3.16.0-rc2_drm-intel-fixes_8525a2_20140630+ #72
[  155.408859]  0000000000000000 0000000000000009 ffffffff8177f9bf
0000000000000000
[  155.408864]  ffffffff8103983c 0000000000000000 ffffffffa00c1062
0000000000000002
[  155.408869]  ffff880002dea0d8 0000000000000002 0000000000000000
0000000000000022
[  155.408880] Call Trace:
[  155.408887]  [<ffffffff8177f9bf>] ? dump_stack+0x41/0x51
[  155.408893]  [<ffffffff8103983c>] ? warn_slowpath_common+0x78/0x90
[  155.408922]  [<ffffffffa00c1062>] ? intel_dp_complete_link_train+0x100/0x27f
[i915]
[  155.408943]  [<ffffffffa00c1062>] ? intel_dp_complete_link_train+0x100/0x27f
[i915]
[  155.408964]  [<ffffffffa00c125c>] ? intel_enable_dp+0x70/0x79 [i915]
[  155.408985]  [<ffffffffa00c137b>] ? vlv_pre_enable_dp+0x100/0x11a [i915]
[  155.409007]  [<ffffffffa00a6893>] ? valleyview_crtc_enable+0x864/0x960
[i915]
[  155.409029]  [<ffffffffa00aa963>] ? __intel_set_mode+0x10cc/0x11d4 [i915]
[  155.409034]  [<ffffffff8177c99c>] ? printk+0x4f/0x54
[  155.409056]  [<ffffffffa00ac876>] ? intel_set_mode+0xd/0x27 [i915]
[  155.409078]  [<ffffffffa00ad45c>] ? intel_crtc_set_config+0x70e/0xa13 [i915]
[  155.409092]  [<ffffffffa000c024>] ? drm_mode_set_config_internal+0x48/0xad
[drm]
[  155.409104]  [<ffffffffa000edd8>] ? drm_mode_setcrtc+0x3e6/0x48b [drm]
[  155.409110]  [<ffffffff810612d4>] ? put_prev_entity+0x34/0x1dc
[  155.409120]  [<ffffffffa0002f6e>] ? drm_ioctl+0x25c/0x3ad [drm]
[  155.409131]  [<ffffffffa000e9f2>] ? drm_mode_setplane+0x381/0x381 [drm]
[  155.409137]  [<ffffffff811195f7>] ? do_vfs_ioctl+0x3ec/0x435
[  155.409142]  [<ffffffff8110b874>] ? vfs_write+0x127/0x183
[  155.409147]  [<ffffffff81119689>] ? SyS_ioctl+0x49/0x78
[  155.409152]  [<ffffffff81785552>] ? system_call_fastpath+0x16/0x1b


==Reproduce steps==
---------------------------- 
1.  ./kms_flip --run-subtest plain-flip-fb-recreate-interruptible

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