[Bug 82841] New: [BYT-M Regression]S3/S4 sauses " WARNING: CPU: 0 PID: 987 at drivers/gpu/drm/i915/intel_dp.c:1223 intel_dp_probe_oui.part.14+0x12/0xb9 [i915]()"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=82841

          Priority: high
            Bug ID: 82841
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [BYT-M Regression]S3/S4 sauses " WARNING: CPU: 0 PID:
                    987 at drivers/gpu/drm/i915/intel_dp.c:1223
                    intel_dp_probe_oui.part.14+0x12/0xb9 [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 104936
  --> https://bugs.freedesktop.org/attachment.cgi?id=104936&action=edit
dmesg

==System Environment==
--------------------------
Regression: Yes.
Result on -next-queued(5193109cd669c7990b043a7187548546c16f8af3) was "System
unable resume from S3/S4 "(Bug 81948)

Non-working platforms: BYT-M

==kernel==
--------------------------
origin/drm-intel-nightly: 49ceddc7b3b0e3f7eb21b9fb4c9b840cff630047(fails)
    drm-intel-nightly: 2014y-08m-19d-19h-02m-49s integration manifest
origin/drm-intel-next-queued: 3f72c7b12f1a81a32fd37216b3382e6fe46a7184(fails)
    drm/i915/bdw: Disable execlists by default
origin/drm-intel-fixes: 1a125d8a2c22b11741fc47d4ffcf7a5ffa044dd3(fails)
    drm/i915: don't try to retrain a DP link on an inactive CRTC

==Bug detailed description==
-----------------------------
S3/S4 sauses " WARNING: CPU: 0 PID: 987 at drivers/gpu/drm/i915/intel_dp.c:1223
intel_dp_probe_oui.part.14+0x12/0xb9 [i915]()"

System unable resume from S3/S4 before(Bug 81948)

Output:
root at x-bytm02:~# dmesg -r|egrep "<[1-4]>"|grep drm
root at x-bytm02:~# echo 0 > /sys/class/rtc/rtc0/wakealarm ; echo +10 >
/sys/class/rtc/rtc0/wakealarm; echo mem > /sys/power/state
root at x-bytm02:~# dmesg -r|egrep "<[1-4]>"|grep drm                              
 <4>[   57.438319] WARNING: CPU: 0 PID: 987 at
drivers/gpu/drm/i915/intel_dp.c:1223 intel_dp_probe_oui.part.14+0x12/0xb9
[i915]()
<4>[   57.438348] Modules linked in: dm_mod iTCO_wdt snd_hda_codec_hdmi
iTCO_vendor_support snd_hda_codec_conexant snd_hda_codec_generic pcspkr
i2c_i801 snd_hda_intel lpc_ich snd_hda_controller r8169 mfd_core snd_hda_codec
snd_hwdep snd_pcm snd_timer snd soundcore battery wmi iosf_mbi ac acpi_cpufreq
uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev
i915 button video drm_kms_helper drm cfbfillrect cfbimgblt cfbcopyarea
<4>[   57.438353] CPU: 0 PID: 987 Comm: kworker/u8:2 Not tainted
3.17.0-rc1_drm-intel-nightly_09fcef_20140819+ #1580
<4>[   57.438492]  [<ffffffffa00590ac>] ? drm_helper_hpd_irq_event+0x60/0xe8
[drm_kms_helper]
<4>[   57.438507]  [<ffffffffa007d216>] ? __i915_drm_thaw+0x121/0x16a [i915]
<4>[   57.463714] WARNING: CPU: 3 PID: 987 at
drivers/gpu/drm/i915/intel_dp.c:1294 edp_panel_vdd_off+0x33/0x58 [i915]()
<4>[   57.463742] Modules linked in: dm_mod iTCO_wdt snd_hda_codec_hdmi
iTCO_vendor_support snd_hda_codec_conexant snd_hda_codec_generic pcspkr
i2c_i801 snd_hda_intel lpc_ich snd_hda_controller r8169 mfd_core snd_hda_codec
snd_hwdep snd_pcm snd_timer snd soundcore battery wmi iosf_mbi ac acpi_cpufreq
uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev
i915 button video drm_kms_helper drm cfbfillrect cfbimgblt cfbcopyarea
<4>[   57.463747] CPU: 3 PID: 987 Comm: kworker/u8:2 Tainted: G        W     
3.17.0-rc1_drm-intel-nightly_09fcef_20140819+ #1580
<4>[   57.463910]  [<ffffffffa00590ac>] ? drm_helper_hpd_irq_event+0x60/0xe8
[drm_kms_helper]
<4>[   57.463926]  [<ffffffffa007d216>] ? __i915_drm_thaw+0x121/0x16a [i915]

Reproduce steps:
-------------------------
==Reproduce steps==
---------------------------- 
1. echo mem >/sys/power/state
2. Press power button

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