[Bug 93386] Instant resume from suspend - WARNING: CPU: 3 PID: 3160 at drivers/gpu/drm/i915/intel_display.c:8265 hsw_enable_pc8+0x659/0x7c0 [i915]()

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93386

--- Comment #4 from Tomi Sarvela <tomi.p.sarvela at intel.com> ---
Todays DRM-Tip on Broadwell NUC, this happens on every suspend/resume test on
IGT

 5044.290694] PM: resume of devices complete after 523.764 msecs
[ 5044.291443] PM: Finishing wakeup.
[ 5044.291446] Restarting tasks ... done.
[ 5044.299394] pcieport 0000:00:1c.0: Enabling MPC IRBNCE
[ 5044.299400] pcieport 0000:00:1c.0: Intel PCH root port ACS workaround
enabled
[ 5044.299521] [drm:intel_power_well_disable [i915]] disabling display
[ 5044.299555] [drm:hsw_set_power_well [i915]] Requesting to disable the power
well
[ 5044.299575] [drm:intel_power_well_disable [i915]] disabling always-on
[ 5044.299768] [drm:intel_runtime_suspend [i915]] Suspending device
[ 5044.299835] [drm:hsw_enable_pc8 [i915]] Enabling package C8+
[ 5044.299869] ------------[ cut here ]------------
[ 5044.299895] WARNING: CPU: 0 PID: 16523 at
drivers/gpu/drm/i915/intel_display.c:8637 hsw_enable_pc8+0x6e5/0x730 [i915]
[ 5044.299897] Power well on
[ 5044.299900] Modules linked in: snd_hda_intel i915 vgem snd_hda_codec_hdmi
snd_hda_codec_realtek snd_hda_codec_generic x86_pkg_temp_thermal
intel_powerclamp coretemp crct10dif_pclmul crc32_pclmul ghash_clmulni_intel
snd_hda_codec snd_hwdep lpc_ich e1000e snd_hda_core mei_me snd_pcm ptp
prime_numbers mei pps_core i2c_hid i2c_designware_platform i2c_designware_core
[last unloaded: i915]
[ 5044.299967] CPU: 0 PID: 16523 Comm: kworker/0:2 Tainted: G     U  W      
4.11.0-rc5-CI-CI_DRM_334+ #1
[ 5044.299970] Hardware name:                  /NUC5i7RYB, BIOS
RYBDWi35.86A.0362.2017.0118.0940 01/18/2017
[ 5044.299975] Workqueue: pm pm_runtime_work
[ 5044.299980] Call Trace:
[ 5044.299985]  dump_stack+0x67/0x92
[ 5044.299990]  __warn+0xc6/0xe0
[ 5044.299996]  ? pci_pm_runtime_resume+0xa0/0xa0
[ 5044.299999]  warn_slowpath_fmt+0x46/0x50
[ 5044.300025]  ? gen6_read32+0x1a2/0x2c0 [i915]
[ 5044.300051]  hsw_enable_pc8+0x6e5/0x730 [i915]
[ 5044.300056]  ? pci_pm_runtime_resume+0xa0/0xa0
[ 5044.300075]  intel_runtime_suspend+0x1e2/0x290 [i915]
[ 5044.300080]  pci_pm_runtime_suspend+0x58/0x180
[ 5044.300084]  __rpm_callback+0xb4/0x1f0
[ 5044.300090]  rpm_callback+0x1f/0x80
[ 5044.300093]  ? pci_pm_runtime_resume+0xa0/0xa0
[ 5044.300097]  rpm_suspend+0x11e/0x6f0
[ 5044.300104]  pm_runtime_work+0x76/0xc0
[ 5044.300108]  process_one_work+0x1f2/0x6d0
[ 5044.300115]  worker_thread+0x49/0x4a0
[ 5044.300122]  kthread+0x107/0x140
[ 5044.300125]  ? process_one_work+0x6d0/0x6d0
[ 5044.300129]  ? kthread_create_on_node+0x40/0x40
[ 5044.300134]  ret_from_fork+0x2e/0x40
[ 5044.300148] ---[ end trace 1994579fb4695d55 ]---
[ 5044.304243] [drm:intel_runtime_suspend [i915]] Device suspended
[ 5045.479520] [drm:intel_hdmi_detect [i915]] [CONNECTOR:48:HDMI-A-1]
[ 5045.491473] [drm:intel_runtime_resume [i915]] Resuming device
[ 5045.493879] [drm:hsw_disable_pc8 [i915]] Disabling package C8+
[ 5045.493970] [drm:intel_update_cdclk [i915]] Current CD clock rate: 540000
kHz, VCO: 0 kHz, ref: 0 kHz
[ 5045.494200] [drm:intel_runtime_resume [i915]] Device resumed
[ 5045.494227] [drm:intel_power_well_enable [i915]] enabling always-on

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