[Bug 82551] [HSW/BDW/BSW/SKL mobile] HDMI hot plug sporadically cause ERROR

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=82551

--- Comment #25 from xubin <bin.a.xu at intel.com> ---
Tested on SKLY03 with the testing kernel drm-intel-testing-2015-05-08.
this problem still exists.

Output:
[  876.486163] [drm:check_crtc_state [i915]] *ERROR* mismatch in ddi_pll_sel
(expected 0x00000000, found 0x00000001)
[  876.486276] ------------[ cut here ]------------
[  876.486311] WARNING: CPU: 2 PID: 1004 at
drivers/gpu/drm/i915/intel_display.c:12074 check_crtc_state+0xb67/0xbd1
[i915]()
[  876.486313] pipe state doesn't match!
[  876.486316] Modules linked in: dm_mod snd_hda_codec_hdmi
snd_hda_codec_realtek snd_hda_codec_generic snd_hda_intel snd_hda_codec
snd_hda_core snd_hwdep snd_pcm ppdev serio_raw pcspkr snd_timer i2c_i801 snd
soundcore wmi battery parport_pc parport ac acpi_cpufreq i915 button video
drm_kms_helper drm
[  876.486350] CPU: 2 PID: 1004 Comm: kworker/2:1 Tainted: G     U  W      
4.1.0-rc2_drm-intel-testing-2015-05-08+ #2
[  876.486354] Hardware name: Intel Corporation Skylake Client platform/Skylake
Y LPDDR3 RVP3, BIOS SKLSE2R1.R00.B082.B00.1504240146 04/24/2015
[  876.486389] Workqueue: events i915_hotplug_work_func [i915]
[  876.486417]  0000000000000000 0000000000000009 ffffffff817a66cc
ffff88016864f8b8
[  876.486424]  ffffffff8103ebde ffff88016864f8b0 ffffffffa00ca3b0
ffff88007bb10000
[  876.486429]  ffff880163b78000 ffff880163628000 ffff88016864f940
ffff88007ba81c00
[  876.486435] Call Trace:
[  876.486446]  [<ffffffff817a66cc>] ? dump_stack+0x40/0x50
[  876.486454]  [<ffffffff8103ebde>] ? warn_slowpath_common+0x98/0xb0
[  876.486501]  [<ffffffffa00ca3b0>] ? check_crtc_state+0xb67/0xbd1 [i915]
[  876.486513]  [<ffffffff8103ec3b>] ? warn_slowpath_fmt+0x45/0x4a
[  876.486544]  [<ffffffffa00ca3b0>] ? check_crtc_state+0xb67/0xbd1 [i915]
[  876.486583]  [<ffffffffa00d959d>] ? intel_modeset_check_state+0x610/0x9e9
[i915]
[  876.486626]  [<ffffffffa00d9db8>] ? intel_crtc_set_config+0x3f8/0x531 [i915]
[  876.486651]  [<ffffffffa0018203>] ? drm_modeset_lock+0x4e/0xa3 [drm]
[  876.486673]  [<ffffffffa000c2be>] ? drm_mode_set_config_internal+0x4e/0xd2
[drm]
[  876.486683]  [<ffffffffa0058fc5>] ? restore_fbdev_mode+0xac/0xc3
[drm_kms_helper]
[  876.486692]  [<ffffffffa005a7c6>] ?
drm_fb_helper_restore_fbdev_mode_unlocked+0x1e/0x54 [drm_kms_helper]
[  876.486701]  [<ffffffffa005a82a>] ? drm_fb_helper_set_par+0x2e/0x32
[drm_kms_helper]
[  876.486709]  [<ffffffffa005a7a2>] ? drm_fb_helper_hotplug_event+0xa1/0xa7
[drm_kms_helper]
[  876.486715]  [<ffffffff8104f985>] ? process_one_work+0x1b2/0x31d
[  876.486721]  [<ffffffff8105026f>] ? worker_thread+0x265/0x351
[  876.486726]  [<ffffffff8105000a>] ? cancel_delayed_work_sync+0xa/0xa
[  876.486732]  [<ffffffff81053ee1>] ? kthread+0xce/0xd6
[  876.486739]  [<ffffffff81053e13>] ? kthread_create_on_node+0x162/0x162
[  876.486745]  [<ffffffff817ac5d2>] ? ret_from_fork+0x42/0x70
[  876.486751]  [<ffffffff81053e13>] ? kthread_create_on_node+0x162/0x162
[  876.486756] ---[ end trace 8103221c8aae6bac ]---

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