[Bug 90060] New: [BDW Regression]igt/pm_rpm/debugfs-read causes *ERROR* dpcd read (15 bytes at 0) failed (-110)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90060

            Bug ID: 90060
           Summary: [BDW Regression]igt/pm_rpm/debugfs-read causes *ERROR*
                    dpcd read (15 bytes at 0) failed (-110)
           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: huax.lu at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 115140
  --> https://bugs.freedesktop.org/attachment.cgi?id=115140&action=edit
dmesg

==System Environment==
--------------------------
Regression: Yes

good commit: 2d1070b21e004609a5bebafdb4303bb021f5477c
bad commit: 097f8261ddda4b1896dd335dec95dedeecfeaa1b

Non-working platforms: BDW

==kernel==
--------------------------
drm-intel-nightly/d600654ab94b325f253e267422dcf60302120ea0
commit d600654ab94b325f253e267422dcf60302120ea0
Author: Daniel Vetter <daniel.vetter at ffwll.ch>
Date:   Thu Apr 16 17:54:10 2015 +0200

    drm-intel-nightly: 2015y-04m-16d-15h-53m-28s UTC integration manifest

==Bug detailed description==
-----------------------------
It sporadically causes <3>[   48.390458] [drm:i915_dpcd_show [i915]] *ERROR*
dpcd read (15 bytes at 0) failed (-110).

root at x-bdw05:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# time ./pm_rpm
--run-subtest debugfs-read
IGT-Version: 1.10-gbeddb3b (x86_64) (Linux:
4.0.0_drm-intel-nightly_d60065_20150417+ x86_64)
Runtime PM support: 1
PC8 residency support: 1
Subtest debugfs-read: SUCCESS (34.806s)

real    0m35.166s
user    0m0.026s
sys     0m0.026s
root at x-bdw05:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# dmesg -r | egrep
"<[1-4]>" |grep drm
<3>[   48.390458] [drm:i915_dpcd_show [i915]] *ERROR* dpcd read (15 bytes at 0)
failed (-110)
<3>[   48.392991] [drm:i915_dpcd_show [i915]] *ERROR* dpcd read (2 bytes at
112) failed (-110)
<3>[   48.395522] [drm:i915_dpcd_show [i915]] *ERROR* dpcd read (16 bytes at
128) failed (-110)
<3>[   48.398053] [drm:i915_dpcd_show [i915]] *ERROR* dpcd read (11 bytes at
256) failed (-110)
<3>[   48.400584] [drm:i915_dpcd_show [i915]] *ERROR* dpcd read (8 bytes at
512) failed (-110)
<3>[   48.403114] [drm:i915_dpcd_show [i915]] *ERROR* dpcd read (1 bytes at
1536) failed (-110)
<3>[   48.405644] [drm:i915_dpcd_show [i915]] *ERROR* dpcd read (1 bytes at
1792) failed (-110)
<3>[   48.408174] [drm:i915_dpcd_show [i915]] *ERROR* dpcd read (4 bytes at
1793) failed (-110)
<3>[   48.410704] [drm:i915_dpcd_show [i915]] *ERROR* dpcd read (16 bytes at
1824) failed (-110)
<3>[   48.413249] [drm:i915_dpcd_show [i915]] *ERROR* dpcd read (2 bytes at
1842) failed (-110)

==Reproduce steps==
---------------------------- 
1. ./pm_rpm --run-subtest debugfs-read

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