[Bug 88910] New: [BYT bisected]igt/pm_rpm/debugfs-read cause dmesg warn

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88910

            Bug ID: 88910
           Summary: [BYT bisected]igt/pm_rpm/debugfs-read cause dmesg warn
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: hengx.ding at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 113033
  --> https://bugs.freedesktop.org/attachment.cgi?id=113033&action=edit
dmesg for case igt/pm_rpm/debugfs-read

==System Environment==
--------------------------
Regression: yes
Non-working platforms:  BYT
==kernel==
--------------------------
drm-intel-nightly/8b4216f91c7bf8d3459cadf9480116220bd6545e(2015-02-02)


==Bug detailed description==
-----------------------------
igt/pm_rpm/debugfs-read case success, but there is dmesg warn after run this
case:
 dmesg -r |grep '<[1-4]>'|grep drm
<4>[   77.979409] WARNING: CPU: 1 PID: 4003 at
drivers/gpu/drm/i915/intel_uncore.c:69 assert_device_not_suspended+0x45/0x5b
[i915]()
<4>[   77.979414] Modules linked in: dm_mod snd_hda_codec_hdmi iTCO_wdt
iTCO_vendor_support snd_hda_codec_realtek snd_hda_codec_generic serio_raw
pcspkr i2c_i801 snd_hda_intel lpc_ich snd_hda_controller mfd_core snd_hda_codec
snd_hwdep snd_pcm snd_timer snd soundcore battery ac acpi_cpufreq i915 button
video drm_kms_helper drm cfbfillrect cfbimgblt cfbcopyarea
<4>[   77.979444] CPU: 1 PID: 4003 Comm: pm_rpm Not tainted
3.19.0-rc6_drm-intel-nightly_8b4216_20150202+ #126
<3>[   77.992738] [drm:vlv_check_no_gt_access [i915]] *ERROR* GT register
access while GT waking disabled

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

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