[Bug 97798] New: [chv] Unclaimed register detected after reading register 0x1e1110 [PORT_HOTPLUG_EN]

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97798

            Bug ID: 97798
           Summary: [chv] Unclaimed register detected after reading
                    register 0x1e1110 [PORT_HOTPLUG_EN]
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: chris at chris-wilson.co.uk
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

On resume:

  534.786979] ------------[ cut here ]------------
[  534.787474] WARNING: CPU: 0 PID: 936 at
drivers/gpu/drm/i915/intel_uncore.c:803 __unclaimed_reg_debug+0x73/0x90 [i915]
[  534.787491] Unclaimed register detected after reading register 0x1e1110
[  534.787624] Modules linked in: i915 nls_utf8 nls_cp437 vfat fat
crct10dif_pclmul crc32c_intel aesni_intel intel_gtt aes_x86_64 glue_helper lrw
drm_kms_helper gf128mul ablk_helper cryptd
[  534.787647] CPU: 0 PID: 936 Comm: kworker/u4:11 Not tainted 4.8.0-rc5+ #68
[  534.787658] Hardware name:                  /        , BIOS
PYBSWCEL.86A.0027.2015.0507.1758 05/07/2015
[  534.787697] Workqueue: events_unbound async_run_entry_fn
[  534.787735]  ffffffffa01881d3 ffff8802327e7900 ffffffff813e98d9
ffff8802327e7978
[  534.787766]  0000000000000000 ffff8802327e7948 ffffffff81079b87
ffff88023275b180
[  534.787795]  0000032382a62af0 ffffed00464fcf2b 0000000000000001
00000000001e1110
[  534.787803] Call Trace:
[  534.788252]  [<ffffffffa01881d3>] ? __unclaimed_reg_debug+0x73/0x90 [i915]
[  534.788275]  [<ffffffff813e98d9>] dump_stack+0x68/0x9f
[  534.788300]  [<ffffffff81079b87>] __warn+0x107/0x130
[  534.788322]  [<ffffffff81079c42>] warn_slowpath_fmt+0x92/0xb0
[  534.788342]  [<ffffffff81079bb0>] ? __warn+0x130/0x130
[  534.788783]  [<ffffffffa018cd0c>] ? chv_read32+0x8c/0x350 [i915]
[  534.789226]  [<ffffffffa01881d3>] __unclaimed_reg_debug+0x73/0x90 [i915]
[  534.789665]  [<ffffffffa018cf82>] chv_read32+0x302/0x350 [i915]
[  534.790105]  [<ffffffffa018cc80>] ? chv_read16+0x350/0x350 [i915]
[  534.790507]  [<ffffffffa0109fc8>] i915_hpd_irq_setup+0x148/0x1c0 [i915]
[  534.790959]  [<ffffffffa01df23b>] intel_hpd_init+0xab/0xc0 [i915]
[  534.791358]  [<ffffffffa01007af>] i915_drm_resume+0xef/0x1b0 [i915]
[  534.791758]  [<ffffffffa01008aa>] i915_pm_restore+0x3a/0x40 [i915]
[  534.792156]  [<ffffffffa01008c9>] i915_pm_resume+0x9/0x10 [i915]
[  534.792177]  [<ffffffff81441a5e>] pci_pm_resume+0xde/0x180
[  534.792198]  [<ffffffff81441980>] ? pci_pm_resume_noirq+0x100/0x100
[  534.792222]  [<ffffffff8156fec0>] dpm_run_callback+0x40/0x80
[  534.792244]  [<ffffffff815706d9>] device_resume+0xe9/0x3a0
[  534.792264]  [<ffffffff81570990>] ? device_resume+0x3a0/0x3a0
[  534.792283]  [<ffffffff815709a8>] async_resume+0x18/0x40
[  534.792305]  [<ffffffff810af06f>] async_run_entry_fn+0x7f/0x220
[  534.792332]  [<ffffffff810a1be3>] process_one_work+0x3d3/0x810
[  534.792353]  [<ffffffff810a1b5d>] ? process_one_work+0x34d/0x810
[  534.792377]  [<ffffffff810a1810>] ? cancel_delayed_work_sync+0x10/0x10
[  534.792400]  [<ffffffff810a20a3>] worker_thread+0x83/0x720
[  534.792424]  [<ffffffff810a2020>] ? process_one_work+0x810/0x810
[  534.792443]  [<ffffffff810ab59d>] kthread+0x18d/0x1b0
[  534.792463]  [<ffffffff810ab410>] ? kthread_create_on_node+0x340/0x340
[  534.792488]  [<ffffffff81802e6f>] ret_from_fork+0x1f/0x40
[  534.792508]  [<ffffffff810ab410>] ? kthread_create_on_node+0x340/0x340
[  534.792521] ---[ end trace 0655747a541f420b ]---
[  534.909983] PM: resume of devices complete after 169.241 msecs
[  534.919573] PM: Finishing wakeup.
[  534.919578] Restarting tasks ... done.

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