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SubjectRe: [drm/i915/dp] 4a8d79901d: WARNING:at_drivers/gpu/drm/i915/display/intel_display_power.c:#assert_can_disable_lcpll[i915]
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Am I right in assuming this is likely a very delayed test result from before:

fe7d52bccab6 ("drm/i915/dp: Don't use DPCD backlights that need PWM
enable/disable")

Made it into the kernel? I see that there's a PWM being left on, which was the
same issue we were seeing on fi-bdw-samus

On Thu, 2021-02-04 at 17:02 +0800, kernel test robot wrote:
>
> Greeting,
>
> FYI, we noticed the following commit (built with gcc-9):
>
> commit: 4a8d79901d5bed0812d272c372aa40282937b50f ("drm/i915/dp: Enable Intel's
> HDR backlight interface (only SDR for now)")
> https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master
>
>
> in testcase: suspend-stress
> version:
> with following parameters:
>
>         mode: freeze
>         iterations: 10
>
>
>
> on test machine: 4 threads Broadwell-Y with 8G memory
>
> caused below changes (please refer to attached dmesg/kmsg for entire
> log/backtrace):
>
>
>
> If you fix the issue, kindly add following tag
> Reported-by: kernel test robot <oliver.sang@intel.com>
>
>
> kern  :warn  : [   21.137894] ------------[ cut here ]------------
> kern  :warn  : [   21.137897] CPU PWM1 enabled
> kern  :warn  : [   21.137930] WARNING: CPU: 3 PID: 575 at
> drivers/gpu/drm/i915/display/intel_display_power.c:4902
> assert_can_disable_lcpll+0x335/0x3c0 [i915]
> kern  :warn  : [   21.138084] Modules linked in: sd_mod t10_pi sg
> x86_pkg_temp_thermal intel_powerclamp i915 hid_rmi rmi_core hid_multitouch
> coretemp intel_ra
> pl_msr crct10dif_pclmul wmi_bmof crc32_pclmul intel_gtt crc32c_intel
> ghash_clmulni_intel rapl drm_kms_helper intel_cstate ahci libahci serio_raw
> mei_me proces
> sor_thermal_device intel_uncore processor_thermal_rfim syscopyarea sysfillrect
> intel_soc_dts_iosf sysimgblt intel_pch_thermal hid_sensor_custom fb_sys_fops
> li
> bata bcma processor_thermal_mbox joydev mei drm processor_thermal_rapl
> intel_rapl_common int340x_thermal_zone i2c_hid ideapad_laptop sparse_keymap
> wmi rfkill
> video int3400_thermal acpi_thermal_rel i2c_designware_platform dw_dmac
> i2c_designware_core acpi_pad ip_tables
> kern  :warn  : [   21.138148] CPU: 3 PID: 575 Comm: kworker/u8:6 Tainted:
> G        W I       5.11.0-rc2-00745-g4a8d79901d5b #1
> kern  :warn  : [   21.138153] Hardware name: LENOVO 80HE/VIUU4, BIOS A6CN38WW
> 09/30/2014
> kern  :warn  : [   21.138155] Workqueue: events_unbound async_run_entry_fn
> kern  :warn  : [   21.138161] RIP: 0010:assert_can_disable_lcpll+0x335/0x3c0
> [i915]
> kern  :info  : [   21.138263] ahci 0000:00:1f.2: pci_pm_suspend_late+0x0/0x40
> returned 0 after 0 usecs
> kern  :warn  : [   21.138296] Code: c0 75 22 e8 8d 61 cb ff e9 f3 fd ff ff e8
> fd bc 6a c1 0f 0b e9 0c fd ff ff e8 f1 bc 6a c1 0f 0b e9 05 fe ff ff e8 e5 bc
> 6a c1 <0f> 0b e9 cf fd ff ff e8 d9 bc 6a c1 0f 0b e9 a2 fd ff ff e8 cd bc
> kern  :warn  : [   21.138300] RSP: 0018:ffffc900006f3d58 EFLAGS: 00010282
> kern  :warn  : [   21.138304] RAX: 0000000000000000 RBX: ffff8881451002e8 RCX:
> 0000000000000027
> kern  :warn  : [   21.138307] RDX: 0000000000000027 RSI: 0000000000000002 RDI:
> ffff888249397cf8
> kern  :warn  : [   21.138310] RBP: ffff888145100000 R08: ffff888249397cf0 R09:
> ffffc900006f3cf0
> kern  :warn  : [   21.138313] R10: 0000000000000001 R11: 3030302035313969 R12:
> ffff8881451007f0
> kern  :warn  : [   21.138316] R13: ffff888145106c60 R14: 0000000000000002 R15:
> 0000000000000000
> kern  :warn  : [   21.138319] FS:  0000000000000000(0000)
> GS:ffff888249380000(0000) knlGS:0000000000000000
> kern  :warn  : [   21.138322] CS:  0010 DS: 0000 ES: 0000 CR0:
> 0000000080050033
> kern  :warn  : [   21.138325] CR2: 0000557c22ec68a0 CR3: 0000000004c0a003 CR4:
> 00000000003706e0
> kern  :warn  : [   21.138329] Call Trace:
> kern  :warn  : [   21.138334]  hsw_disable_lcpll+0x22/0x280 [i915]
> kern  :warn  : [   21.138479]  i915_drm_suspend_late+0x5e/0x100 [i915]
> kern  :warn  : [   21.138578]  ? pci_pm_poweroff_late+0x40/0x40
> kern  :warn  : [   21.138582]  dpm_run_callback+0x4c/0x140
> kern  :warn  : [   21.138590]  __device_suspend_late+0x98/0x1a0
> kern  :warn  : [   21.138596]  async_suspend_late+0x1b/0xa0
> kern  :warn  : [   21.138602]  async_run_entry_fn+0x39/0x160
> kern  :warn  : [   21.138608]  process_one_work+0x1ed/0x3c0
> kern  :warn  : [   21.138612]  worker_thread+0x50/0x3c0
> kern  :warn  : [   21.138617]  ? process_one_work+0x3c0/0x3c0
> kern  :warn  : [   21.138620]  kthread+0x116/0x160
> kern  :warn  : [   21.138626]  ? kthread_park+0xa0/0xa0
> kern  :warn  : [   21.138631]  ret_from_fork+0x22/0x30
> kern  :warn  : [   21.138640] ---[ end trace a93fe4d40a5a37bb ]---
>
>
>
> To reproduce:
>
>         git clone https://github.com/intel/lkp-tests.git
>         cd lkp-tests
>         bin/lkp install job.yaml  # job file is attached in this email
>         bin/lkp run     job.yaml
>
>
>
> Thanks,
> Oliver Sang
>

--
Sincerely,
Lyude Paul (she/her)
Software Engineer at Red Hat

Note: I deal with a lot of emails and have a lot of bugs on my plate. If you've
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