[Bug 85220] New: [BDW]igt/kms_flip some subcases cause "[drm:hsw_unclaimed_reg_detect.isra.6 [i915]] *ERROR* Unclaimed register detected. Please use the i915.mmio_debug=1 to debug this problem."

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85220

            Bug ID: 85220
           Summary: [BDW]igt/kms_flip some subcases cause
                    "[drm:hsw_unclaimed_reg_detect.isra.6 [i915]] *ERROR*
                    Unclaimed register detected. Please use the
                    i915.mmio_debug=1 to debug this problem."
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: jinxianx.guo at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 108092
  --> https://bugs.freedesktop.org/attachment.cgi?id=108092&action=edit
dmesg

==System Environment==
--------------------------
Regression: No.
They are only fail on nightly branch

Non-working platforms: BDW

==kernel==
--------------------------
origin/drm-intel-nightly: 8d1dbeed28a28ecf964769bf089503f0c90ffdaa(fails)
    drm-intel-nightly: 2014y-10m-19d-14h-54m-38s UTC integration manifest
origin/drm-intel-next-queued: 6476486cb3570d3662e4a3870b884e75d35d1072(another
bug 83094)
    drm/i915: Document that mmap forwarding is discouraged
origin/drm-intel-fixes: bfe01a5ba2490f299e1d2d5508cbbbadd897bbe9(another bug
83094)
    Linux 3.17

==Bug detailed description==
igt/kms_flip some subcases cause "[drm:hsw_unclaimed_reg_detect.isra.6 [i915]]
*ERROR* Unclaimed register detected. Please use the i915.mmio_debug=1 to debug
this problem."

Case list:
igt/kms_flip/vblank-vs-dpms-suspend
igt/kms_flip/vblank-vs-dpms-suspend-interruptible
igt/kms_flip/vblank-vs-modeset-suspend
igt/kms_flip/vblank-vs-modeset-suspend-interruptible
igt/kms_flip/vblank-vs-suspend
igt/kms_flip/vblank-vs-suspend-interruptible
igt/kms_pipe_crc_basic/suspend-read-crc-pipe-A
igt/kms_pipe_crc_basic/suspend-read-crc-pipe-B
igt/kms_pipe_crc_basic/suspend-read-crc-pipe-C
igt/pm_rpm/system-suspend
igt/gem_workarounds/check-workaround-data-after-suspend-resume



Output:
"root at x-bdw05:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# ./kms_flip
--run-subtest vblank-vs-modeset-suspend-interruptible
IGT-Version: 1.8-gbba1cd0 (x86_64) (Linux:
3.17.0_drm-intel-nightly_8d1dbe_20141020+ x86_64)
Using monotonic timestamps
Beginning vblank-vs-modeset-suspend-interruptible on crtc 8, connector 19
  1920x1080 60 1920 1966 1996 2080 1080 1082 1086 1112 0xa 0x48 138780
.rtcwake: wakeup from ""mem"" using /dev/rtc0 at Mon Oct 20 19:06:42 2014
.rtcwake: wakeup from ""mem"" using /dev/rtc0 at Mon Oct 20 19:07:14 2014

vblank-vs-modeset-suspend-interruptible on crtc 8, connector 19: PASSED

Beginning vblank-vs-modeset-suspend-interruptible on crtc 12, connector 19
  1920x1080 60 1920 1966 1996 2080 1080 1082 1086 1112 0xa 0x48 138780
.rtcwake: wakeup from ""mem"" using /dev/rtc0 at Mon Oct 20 19:07:46 2014
.rtcwake: wakeup from ""mem"" using /dev/rtc0 at Mon Oct 20 19:08:18 2014

vblank-vs-modeset-suspend-interruptible on crtc 12, connector 19: PASSED

Beginning vblank-vs-modeset-suspend-interruptible on crtc 16, connector 19
  1920x1080 60 1920 1966 1996 2080 1080 1082 1086 1112 0xa 0x48 138780
.rtcwake: wakeup from ""mem"" using /dev/rtc0 at Mon Oct 20 19:08:50 2014
.rtcwake: wakeup from ""mem"" using /dev/rtc0 at Mon Oct 20 19:09:22 2014

vblank-vs-modeset-suspend-interruptible on crtc 16, connector 19: PASSED

Subtest vblank-vs-modeset-suspend-interruptible: SUCCESS (10.538s)
root at x-bdw05:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# dmesg -r|egrep
""<[1-4]>""|grep drm         <3>[  390.912991]
[drm:hsw_unclaimed_reg_detect.isra.6 [i915]] *ERROR* Unclaimed register
detected. Please use the i915.mmio_debug=1 to debug this problem.
<3>[  392.685532] [drm:hsw_unclaimed_reg_detect.isra.6 [i915]] *ERROR*
Unclaimed register detected. Please use the i915.mmio_debug=1 to debug this
problem.
<3>[  394.518097] [drm:hsw_unclaimed_reg_detect.isra.6 [i915]] *ERROR*
Unclaimed register detected. Please use the i915.mmio_debug=1 to debug this
problem.
<3>[  396.269628] [drm:hsw_unclaimed_reg_detect.isra.6 [i915]] *ERROR*
Unclaimed register detected. Please use the i915.mmio_debug=1 to debug this
problem.
<3>[  398.091189] [drm:hsw_unclaimed_reg_detect.isra.6 [i915]] *ERROR*
Unclaimed register detected. Please use the i915.mmio_debug=1 to debug this
problem.
<3>[  399.834712] [drm:hsw_unclaimed_reg_detect.isra.6 [i915]] *ERROR*
Unclaimed register detected. Please use the i915.mmio_debug=1 to debug this
problem.


==Reproduce steps==
---------------------------- 
1. ./kms_flip --run-subtest vblank-vs-modeset-suspend-interruptible

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