[Bug 83760] New: [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

          Priority: high
            Bug ID: 83760
          Keywords: bisect_pending
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [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]()"
        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 106121
  --> https://bugs.freedesktop.org/attachment.cgi?id=106121&action=edit
dmesg

==System Environment==
--------------------------
Regression: Yes.
Good commit on -next-queued: 17c58fe801f5588c5904cc2f15620f7f5a465b53

Non-working platforms: BSW

==kernel==
--------------------------
origin/drm-intel-nightly: 72faa6a63351879b381bd9e4013f38bc94f11999(fails)
    drm-intel-nightly: 2014y-09m-10d-18h-58m-22s integration manifest
origin/drm-intel-next-queued:449b3795f2a48c51ad1714cd5eab0179e37c6a85(fails)
    drm/i915: create intel_update_pipe_size()
origin/drm-intel-fixes: 7a98948f3b536ca9a077e84966ddc0e9f53726df(works)
    drm/i915: Wait for vblank before enabling the TV encoder

==Bug detailed description==
-----------------------------
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]()"


Output:
[root at x-bsw01 tests]# ./kms_flip --run-subtest vblank-vs-modeset-rpm
IGT-Version: 1.8-gd9d3f4b (x86_64) (Linux:
3.17.0-rc4_drm-intel-nightly_72faa6_20140911+ x86_64)
Using monotonic timestamps
Beginning vblank-vs-modeset-rpm on crtc 8, connector 31
  1920x1080 60 1920 1966 1996 2080 1080 1082 1086 1112 0xa 0x48 138780
....
vblank-vs-modeset-rpm on crtc 8, connector 31: PASSED

Beginning vblank-vs-modeset-rpm on crtc 13, connector 31
  1920x1080 60 1920 1966 1996 2080 1080 1082 1086 1112 0xa 0x48 138780
....
vblank-vs-modeset-rpm on crtc 13, connector 31: PASSED

Subtest vblank-vs-modeset-rpm: SUCCESS (17.691s)
[root at x-bsw01 tests]# dmesg -r|egrep ""<[1-4]>""|grep drm
<4>[  376.093902]  [<ffffffffa0017fad>] ?
drm_mode_set_config_internal+0x48/0xbd [drm]
<4>[  376.093920]  [<ffffffffa001b9a9>] ? drm_mode_setcrtc+0x3e6/0x48b [drm]
<4>[  376.093936]  [<ffffffffa001063c>] ? drm_ioctl+0x279/0x3bc [drm]
<4>[  376.093956]  [<ffffffffa001b5c3>] ? drm_mode_setplane+0x16d/0x16d [drm]
<4>[  376.093970]  [<ffffffffa000ec2c>] ? drm_read+0x148/0x16c [drm]
<4>[  376.095428] WARNING: CPU: 0 PID: 3894 at
drivers/gpu/drm/i915/intel_uncore.c:47 chv_read32+0x20/0x224 [i915]()
<4>[  376.095437] Modules linked in: ip6table_filter ip6_tables iptable_filter
ip_tables ebtable_nat ebtables x_tables ipv6 dm_mod snd_hda_codec_hdmi
snd_hda_codec_realtek snd_hda_codec_generic pcspkr serio_raw snd_hda_intel
snd_hda_controller snd_hda_codec snd_hwdep snd_pcm i2c_i801 snd_timer r8169 snd
soundcore battery ac option usb_wwan usbserial i915 button video drm_kms_helper
drm cfbfillrect cfbimgblt cfbcopyarea
<4>[  376.095487] CPU: 0 PID: 3894 Comm: kms_flip Tainted: G        W     
3.17.0-rc4_drm-intel-nightly_72faa6_20140911+ #2340
<4>[  376.095893]  [<ffffffffa0017fad>] ?
drm_mode_set_config_internal+0x48/0xbd [drm]
<4>[  376.095910]  [<ffffffffa001b9a9>] ? drm_mode_setcrtc+0x3e6/0x48b [drm]
<4>[  376.095926]  [<ffffffffa001063c>] ? drm_ioctl+0x279/0x3bc [drm]
<4>[  376.095943]  [<ffffffffa001b5c3>] ? drm_mode_setplane+0x16d/0x16d [drm]
<4>[  376.095960]  [<ffffffffa000ec2c>] ? drm_read+0x148/0x16c [drm]


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

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