[Bug 89056] New: [SKLY]DP/HDMI hotplug cause Call Trace at drivers/gpu/drm/i915/intel_pm.c

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89056

            Bug ID: 89056
           Summary: [SKLY]DP/HDMI hotplug cause Call Trace at
                    drivers/gpu/drm/i915/intel_pm.c
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: lei.a.liu at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 113298
  --> https://bugs.freedesktop.org/attachment.cgi?id=113298&action=edit
dmesg

==System Environment==
--------------------------
Bios : V68
Regression: No. First test on this platform.
boot with DP or HDMI monitor
Non-working platforms: SKLY

==kernel==
--------------------------
-nightly: b4442ee4e150506cebeee72249efc566c5f14bbe (fails)
     drm-intel-nightly: 2015y-02m-06d-09h-25m-00s UTC integration manifest

==Bug detailed description==
-----------------------------
Hotplug causes Call Trace

Detail:
[  148.612989] ------------[ cut here ]------------
[  148.613013] WARNING: CPU: 2 PID: 973 at drivers/gpu/drm/i915/intel_pm.c:3084
skl_update_other_pipe_wm+0xe3/0x156 [i915]()
[  148.613015] WARN_ON(!wm_changed)
[  148.613018] Modules linked in: dm_mod ppdev snd_hda_codec_hdmi
snd_hda_codec_realtek snd_hda_codec_generic snd_hda_intel snd_hda_controller
snd_hda_codec snd_hwdep p
cspkr snd_pcm snd_timer snd i2c_i801 soundcore wmi battery parport_pc parport
ac acpi_cpufreq i915 button video drm_kms_helper drm cfbfillrect cfbimgblt
cfbcopyarea
[  148.613048] CPU: 2 PID: 973 Comm: kworker/2:1 Not tainted
3.19.0-rc7_drm-intel-nightly_b4442e_20150208+ #198
[  148.613051] Hardware name: Intel Corporation Skylake Client platform/Skylake
Y LPDDR3 RVP3, BIOS SKLSE2R1.86C.B068.R00.1501090908 01/09/2015
[  148.613075] Workqueue: events i915_hotplug_work_func [i915]
[  148.613078]  0000000000000000 0000000000000009 ffffffff8179a69b
ffff880148ec3848
[  148.613083]  ffffffff8103bdec ffff880143f2991c ffffffffa008d5f4
000000000000ffff
[  148.613088]  ffff880143f29918 ffff880148ec3910 ffff880148f4d800
ffff880148e06000
[  148.613092] Call Trace:
[  148.613102]  [<ffffffff8179a69b>] ? dump_stack+0x40/0x50
[  148.613110]  [<ffffffff8103bdec>] ? warn_slowpath_common+0x98/0xb0
[  148.613125]  [<ffffffffa008d5f4>] ? skl_update_other_pipe_wm+0xe3/0x156
[i915]
[  148.613131]  [<ffffffff8103be9c>] ? warn_slowpath_fmt+0x45/0x4a
[  148.613146]  [<ffffffffa008d5f4>] ? skl_update_other_pipe_wm+0xe3/0x156
[i915]
[  148.613162]  [<ffffffffa008d7a6>] ? skl_update_wm+0x13f/0x5a8 [i915]
[  148.613167]  [<ffffffff81797406>] ? printk+0x48/0x4d
[  148.613193]  [<ffffffffa00d8ee3>] ? haswell_crtc_disable+0x29d/0x30b [i915]
[  148.613215]  [<ffffffffa00d931c>] ? __intel_set_mode+0x289/0x895 [i915]
[  148.613238]  [<ffffffffa00df2d3>] ? intel_crtc_set_config+0x7d0/0xbb9 [i915]
[  148.613251]  [<ffffffffa0024a11>] ? drm_atomic_state_clear+0xec/0x10d [drm]
[  148.613268]  [<ffffffffa001804a>] ? drm_mode_set_config_internal+0x4e/0xd2
[drm]
[  148.613276]  [<ffffffffa00652e2>] ? restore_fbdev_mode+0xa8/0xc3
[drm_kms_helper]
[  148.613283]  [<ffffffffa00665ff>] ?
drm_fb_helper_restore_fbdev_mode_unlocked+0x1f/0x56 [drm_kms_helper]
[  148.613290]  [<ffffffffa0066664>] ? drm_fb_helper_set_par+0x2e/0x33
[drm_kms_helper]
[  148.613297]  [<ffffffffa00665da>] ? drm_fb_helper_hotplug_event+0xa2/0xa8
[drm_kms_helper]
[  148.613310]  [<ffffffff8104d128>] ? process_one_work+0x1ad/0x31a
[  148.613316]  [<ffffffff8104d4ef>] ? worker_thread+0x235/0x330
[  148.613322]  [<ffffffff8104d2ba>] ? process_scheduled_works+0x25/0x25
[  148.613327]  [<ffffffff81050dee>] ? kthread+0xc5/0xcd
[  148.613332]  [<ffffffff81050d29>] ? kthread_freezable_should_stop+0x40/0x40
[  148.613337]  [<ffffffff8179ffec>] ? ret_from_fork+0x7c/0xb0
[  148.613342]  [<ffffffff81050d29>] ? kthread_freezable_should_stop+0x40/0x40
[  148.613345] ---[ end trace 300e923f6c3983e7 ]---


==Reproduce steps==
---------------------------- 
1. boot with DP or HDMI monitor
2. unplug and plug in DP/HDMI monitor
3. check dmesg

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