[Bug 89100] [SKL]kms_universal_plane causes system hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89100

--- Comment #8 from Ding Heng <hengx.ding at intel.com> ---
Created attachment 114193
  --> https://bugs.freedesktop.org/attachment.cgi?id=114193&action=edit
dmesg with nightly branch 20150310

root at x-skly03:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# dmesg -r | egrep
"<[1-4]>" |grep drm
<4>[  141.410057] WARNING: CPU: 0 PID: 5172 at
drivers/gpu/drm/i915/intel_dp.c:658 intel_dp_aux_ch+0xaa/0x57f [i915]()
<4>[  141.410062] Modules linked in: dm_mod snd_hda_codec_realtek
snd_hda_codec_generic ppdev snd_hda_intel snd_hda_controller i2c_i801 pcspkr
snd_hda_codec snd_hwdep snd_pcm snd_timer snd soundcore wmi battery parport_pc
parport ac acpi_cpufreq i915 button video drm_kms_helper drm
<4>[  141.410241]  [<ffffffffa00515db>] ? drm_dp_dpcd_access+0x5b/0xed
[drm_kms_helper]
<4>[  141.410250]  [<ffffffffa0051680>] ? drm_dp_dpcd_read+0x13/0x17
[drm_kms_helper]
<4>[  141.410336]  [<ffffffffa0051e88>] ?
drm_helper_probe_single_connector_modes_merge_bits+0xc4/0x395 [drm_kms_helper]
<4>[  141.410354]  [<ffffffffa000ef5d>] ? drm_mode_getconnector+0xda/0x2aa
[drm]
<4>[  141.410369]  [<ffffffffa00047d4>] ? drm_ioctl+0x344/0x3b3 [drm]
<4>[  141.410391]  [<ffffffffa000ee83>] ? drm_mode_getcrtc+0xfe/0xfe [drm]
<4>[  141.410405]  [<ffffffffa0003b60>] ? drm_gem_vm_close+0x2a/0x4b [drm]
root at x-skly03:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# dmesg -r | egrep
"<[1-4]>" |grep call
<4>[  141.410424]  [<ffffffff81799972>] ? system_call_fastpath+0x12/0x17

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