[Bug 97798] [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

Hans de Goede <jwrdegoede at fedoraproject.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jwrdegoede at fedoraproject.or
                   |                            |g

--- Comment #1 from Hans de Goede <jwrdegoede at fedoraproject.org> ---
I'm seeing this too, on a cherrytrail z8300 based cube iwork8 air tablet:

[ 1050.660449] ------------[ cut here ]------------
[ 1050.660473] WARNING: CPU: 0 PID: 1807 at
drivers/gpu/drm/i915/intel_uncore.c:
832 intel_init_vebox_ring_buffer+0x96f/0x4a40 [i915]
[ 1050.660475] Unclaimed read from register 0x1e1110
[ 1050.660519] Modules linked in: ... (many)
[ 1050.660583] CPU: 0 PID: 1807 Comm: kworker/u8:7 Tainted: G           OE  
4.9.0-rc8+ #6
[ 1050.660585] Hardware name: cube i1-TF/Cherry Trail CR, BIOS 5.11 05/13/2016
[ 1050.660593] Workqueue: events_unbound async_run_entry_fn
[ 1050.660599]  ffffa7668114fba8 ffffffffb13ef4ad ffffa7668114fbf8
0000000000000000
[ 1050.660602]  ffffa7668114fbe8 ffffffffb10a1ddb 0000034033153fac
0000000000000000
[ 1050.660606]  00000000001e1110 0000000000000001 ffff8dbfff218750
0000000000000001
[ 1050.660607] Call Trace:
[ 1050.660614]  [<ffffffffb13ef4ad>] dump_stack+0x63/0x86
[ 1050.660618]  [<ffffffffb10a1ddb>] __warn+0xcb/0xf0
[ 1050.660620]  [<ffffffffb10a1e5f>] warn_slowpath_fmt+0x5f/0x80
[ 1050.660624]  [<ffffffffb10cd4c5>] ? wake_up_process+0x15/0x20
[ 1050.660640]  [<ffffffffc05727ef>] intel_init_vebox_ring_buffer+0x96f/0x4a40
[i915]
[ 1050.660656]  [<ffffffffc0575a17>] intel_init_vebox_ring_buffer+0x3b97/0x4a40
[i915]
[ 1050.660668]  [<ffffffffc052086a>] vlv_force_gfx_clock+0x555a/0x55b0 [i915]
[ 1050.660684]  [<ffffffffc05a9e3d>] intel_hpd_init+0x6d/0x80 [i915]
[ 1050.660695]  [<ffffffffc0519261>] 0xffffffffc0519261
[ 1050.660706]  [<ffffffffc051930e>] 0xffffffffc051930e
[ 1050.660716]  [<ffffffffc051933e>] 0xffffffffc051933e
[ 1050.660720]  [<ffffffffb1446014>] pci_pm_resume+0x64/0xa0
[ 1050.660723]  [<ffffffffb1445fb0>] ? pci_pm_thaw+0x90/0x90
[ 1050.660727]  [<ffffffffb1553b4d>] dpm_run_callback+0x4d/0x120
[ 1050.660730]  [<ffffffffb15540a6>] device_resume+0xa6/0x200
[ 1050.660732]  [<ffffffffb155421d>] async_resume+0x1d/0x50
[ 1050.660735]  [<ffffffffb10c4f49>] async_run_entry_fn+0x39/0x140
[ 1050.660739]  [<ffffffffb10bbe24>] process_one_work+0x184/0x430
[ 1050.660742]  [<ffffffffb10bc11e>] worker_thread+0x4e/0x490
[ 1050.660744]  [<ffffffffb10bc0d0>] ? process_one_work+0x430/0x430
[ 1050.660747]  [<ffffffffb10bc0d0>] ? process_one_work+0x430/0x430
[ 1050.660750]  [<ffffffffb10c1b29>] kthread+0xd9/0xf0
[ 1050.660753]  [<ffffffffb10c1a50>] ? kthread_park+0x60/0x60
[ 1050.660757]  [<ffffffffb18189d5>] ret_from_fork+0x25/0x30
[ 1050.660760] ---[ end trace bd5a695839ae61ae ]---

And then after a second resume:

[ 1060.746358] [drm:intel_init_vebox_ring_buffer [i915]] *ERROR* media: timed
out waiting for forcewake ack request.
[ 1060.796482] [drm:intel_init_vebox_ring_buffer [i915]] *ERROR* media: timed
out waiting for forcewake ack request.

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