[Bug 80122] New: [HSW Regression]igt/kms_flip causes "WARNING: CPU: 5 PID: 4368 at drivers/gpu/drm/i915/intel_pm.c:6174 check_power_well_state+0x69/0x6f [i915]()" sporadically

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=80122

          Priority: high
            Bug ID: 80122
          Keywords: bisect_pending
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [HSW Regression]igt/kms_flip causes "WARNING: CPU: 5
                    PID: 4368 at drivers/gpu/drm/i915/intel_pm.c:6174
                    check_power_well_state+0x69/0x6f [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 101210
  --> https://bugs.freedesktop.org/attachment.cgi?id=101210&action=edit
dmesg

==System Environment==
--------------------------
Regression: Yes. 
This bug only find on -nightly branch.

Non-working platforms: HSW

==kernel==
--------------------------
origin/drm-intel-nightly: e9ce9f961282205b5954a0da4e48e96884190a77(fails)
    drm-intel-nightly: 2014y-06m-16d-21h-22m-19s integration manifest
origin/drm-intel-next-queued: 8c0f92e1f87149bd2429015c9d0600a13a34d607(tried 5
times, didn't find this issue)
    drm/i915: Fix comment about our plane remapping on gen2/3
origin/drm-intel-fixes: 223a6f2b975ab35d93270ea1d4fb6e0ac6b27fe6(tried 5 times,
didn't find this issue)
    drm/i915/bdw: remove erroneous chv specific workarounds from bdw code

==Bug detailed description==
-----------------------------
igt/kms_flip causes "WARNING: CPU: 5 PID: 4368 at
drivers/gpu/drm/i915/intel_pm.c:6174 check_power_well_state+0x69/0x6f [i915]()"

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


Output:
[root at x-hsw26 tests]# ./kms_flip --run-subtest vblank-vs-dpms-suspend
IGT-Version: 1.7-gd123de6 (x86_64) (Linux:
3.15.0-rc8_drm-intel-nightly_e9ce9f_20140617+ x86_64)
Using monotonic timestamps
Beginning vblank-vs-dpms-suspend on crtc 6, connector 25
  1920x1080 60 1920 2008 2052 2200 1080 1082 1087 1125 0x5 0x48 148500
.rtcwake: wakeup from "mem" using /dev/rtc0 at Tue Jun 17 21:28:21 2014
.rtcwake: wakeup from "mem" using /dev/rtc0 at Tue Jun 17 21:28:54 2014

vblank-vs-dpms-suspend on crtc 6, connector 25: PASSED

Beginning vblank-vs-dpms-suspend on crtc 10, connector 25
  1920x1080 60 1920 2008 2052 2200 1080 1082 1087 1125 0x5 0x48 148500
.rtcwake: wakeup from "mem" using /dev/rtc0 at Tue Jun 17 21:29:27 2014
.rtcwake: wakeup from "mem" using /dev/rtc0 at Tue Jun 17 21:30:00 2014

vblank-vs-dpms-suspend on crtc 10, connector 25: PASSED

Beginning vblank-vs-dpms-suspend on crtc 14, connector 25
  1920x1080 60 1920 2008 2052 2200 1080 1082 1087 1125 0x5 0x48 148500
.rtcwake: wakeup from "mem" using /dev/rtc0 at Tue Jun 17 21:30:33 2014
.rtcwake: wakeup from "mem" using /dev/rtc0 at Tue Jun 17 21:31:06 2014

vblank-vs-dpms-suspend on crtc 14, connector 25: PASSED

Subtest vblank-vs-dpms-suspend: SUCCESS



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

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