[Bug 84074] New: [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]()"

Thu Sep 18 20:44:49 PDT 2014

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

          Priority: medium
            Bug ID: 84074
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [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]()"
        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

==System Environment==
--------------------------
Regression: No.
The failure only occurs on -nightly branch

Non-working platforms: BYT

==kernel==
--------------------------
origin/drm-intel-nightly:3d788a0e87efd99553d5b00a70ab2a162c2c2283(fails)
    drm-intel-nightly: 2014y-09m-18d-14h-51m-54s UTC integration manifest
origin/drm-intel-next-queued:f2a95be39ef661595379c23964710f0d760a2385(another
bug 82446)
    drm/i915/vlv: Remove check for Old Ack during forcewake
origin/drm-intel-fixes: 8c875fca1a8d76665c60fa141c220cee65f44f5e(another bug
82800)
    drm/i915: Add limited color range readout for HDMI/DP ports on g4x/vlv/chv
origin/drm-fixes: 7dc9250f1d08f470f8d4e585a2eaeb951d4356be (another bug 82800)
    drm: sti: do not iterate over the info frame array
origin/drm-next: 8337486a8fda53e5f46b3cb2b4eb3272608348cb (another bug 82446)
    Merge branch 'drm/next/du' of git://linuxtv.org/pinchartl/fbdev into
drm-next


==Bug detailed description==
-----------------------------
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]()"

Case list:
igt/kms_flip/flip-vs-expired-vblank
igt/kms_flip/flip-vs-expired-vblank-interruptible

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

Beginning flip-vs-expired-vblank on crtc 13, connector 28
  1366x768 60 1366 1404 1426 1482 768 771 777 798 0xa 0x48 71000
..................................................................................Test
assertion failure function run_test_step, file kms_flip.c:837:
Failed assertion: reply.sequence == exp_seq
Subtest flip-vs-expired-vblank: FAIL (22.266s)
root at x-bytm02:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# dmesg -r|egrep
""<[1-4]>""|grep drm
<3>[   96.203586] [drm:intel_dp_complete_link_train] *ERROR* failed to train
DP, aborting
<4>[   97.254477] WARNING: CPU: 0 PID: 4384 at
drivers/gpu/drm/i915/intel_display.c:1746 valleyview_crtc_enable+0x9e4/0xaee
[i915]()
<4>[   97.254484] Modules linked in: dm_mod snd_hda_codec_hdmi iTCO_wdt
iTCO_vendor_support snd_hda_codec_conexant snd_hda_codec_generic pcspkr
i2c_i801 r8169 lpc_ich mfd_core snd_hda_intel snd_hda_controller snd_hda_codec
snd_hwdep 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>[   97.254525] CPU: 0 PID: 4384 Comm: kms_flip Not tainted
3.17.0-rc5_drm-intel-nightly_3d788a_20140919+ #2612
<4>[   97.254750]  [<ffffffffa0017fe5>] ?
drm_mode_set_config_internal+0x48/0xbd [drm]
<4>[   97.254764]  [<ffffffffa001ba0e>] ? drm_mode_setcrtc+0x3e6/0x48b [drm]
<4>[   97.254776]  [<ffffffffa001074c>] ? drm_ioctl+0x279/0x3bc [drm]
<4>[   97.254796]  [<ffffffffa001b628>] ? drm_mode_setplane+0x1ce/0x1ce [drm]
<3>[   98.512241] [drm:i9xx_set_fifo_underrun_reporting] *ERROR* pipe B
underrun
<3>[   98.512251] [drm:valleyview_pipestat_irq_handler] *ERROR* pipe B underrun
<3>[  104.117081] [drm:intel_dp_complete_link_train] *ERROR* failed to train
DP, aborting


==Reproduce steps==
---------------------------- 
1. ./kms_flip --run-subtest flip-vs-expired-vblank

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