[Bug 83760] [BSW Regression]igt/kms_flip/vblank-vs-modeset-rpm causes "WARNING: CPU: 0 PID: 3894 at drivers/gpu/drm/i915/intel_uncore.c:47 chv_read32+0x20/0x224 [i915]()"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=83760

--- Comment #1 from Guo Jinxian <jinxianx.guo at intel.com> ---
The failure is able to reproduce on latest nightly() while running tests below:
igt/pm_rpm/dpms-lpsp
igt/pm_rpm/dpms-mode-unset-lpsp
igt/pm_rpm/drm-resources-equal
igt/pm_rpm/fences
igt/pm_rpm/gem-execbuf
igt/pm_rpm/gem-mmap-cpu
igt/pm_rpm/gem-mmap-gtt
igt/pm_rpm/gem-pread
igt/pm_rpm/i2c
igt/pm_rpm/modeset-lpsp
igt/pm_rpm/modeset-lpsp-stress
igt/pm_rpm/pci-d3-state
igt/pm_rpm/rte


[root at x-bsw01 tests]# ./pm_rpm --run-subtest dpms-lpsp
IGT-Version: 1.8-g137877f (x86_64) (Linux:
3.17.0-rc5_drm-intel-nightly_3e5e59_20140918+ x86_64)
Runtime PM support: 1
PC8 residency support: 0
Subtest dpms-lpsp: SUCCESS (3.093s)
[root at x-bsw01 tests]# dmesg -r|egrep "<[1-4]>"|grep drm
<4>[15127.251222] WARNING: CPU: 2 PID: 10554 at
drivers/gpu/drm/i915/intel_uncore.c:47 chv_read32+0x20/0x224 [i915]()
<4>[15127.251228] Modules linked in: dm_mod snd_hda_codec_hdmi
snd_hda_codec_realtek snd_hda_codec_generic pcspkr serio_raw i2c_i801 r8169
snd_hda_intel snd_hda_controller snd_hda_codec snd_hwdep snd_pcm snd_timer snd
soundcore battery ac option usb_wwan usbserial i915 button video drm_kms_helper
drm cfbfillrect cfbimgblt cfbcopyarea
<4>[15127.251272] CPU: 2 PID: 10554 Comm: pm_rpm Not tainted
3.17.0-rc5_drm-intel-nightly_3e5e59_20140918+ #2584
<4>[15127.251751]  [<ffffffffa0017fe5>] ?
drm_mode_set_config_internal+0x48/0xbd [drm]
<4>[15127.251768]  [<ffffffffa001ba0e>] ? drm_mode_setcrtc+0x3e6/0x48b [drm]
<4>[15127.251783]  [<ffffffffa001074c>] ? drm_ioctl+0x279/0x3bc [drm]
<4>[15127.251807]  [<ffffffffa001b628>] ? drm_mode_setplane+0x1ce/0x1ce [drm]

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