https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_4709/fi-icl-u/igt@gem_exec_suspend@basic-s3.html

[  137.897089] ------------[ cut here ]------------
[  137.897116] WARN_ON(!intel_pstate->base.fb)
[  137.897190] WARNING: CPU: 2 PID: 588 at drivers/gpu/drm/i915/intel_pm.c:4786 skl_compute_wm_levels+0x361/0x690 [i915]
[  137.897194] Modules linked in: vgem snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic ax88179_178a usbnet x86_pkg_temp_thermal mii coretemp i915 crct10dif_pclmul crc32_pclmul snd_hda_intel snd_hda_codec ghash_clmulni_intel snd_hwdep snd_hda_core snd_pcm e1000e prime_numbers
[  137.897270] CPU: 2 PID: 588 Comm: kworker/u16:3 Tainted: G     U  W         4.19.0-rc1-CI-CI_DRM_4709+ #1
[  137.897273] Hardware name: Intel Corporation Ice Lake Client Platform/IceLake U DDR4 SODIMM PD RVP, BIOS ICLSFWR1.R00.2313.A01.1808012121 08/01/2018
[  137.897280] Workqueue: events_unbound async_run_entry_fn
[  137.897332] RIP: 0010:skl_compute_wm_levels+0x361/0x690 [i915]
[  137.897338] Code: 00 40 0f 97 c7 83 c7 02 49 83 7b 10 00 89 7c 24 04 0f 85 20 fd ff ff 48 c7 c6 70 28 2b a0 48 c7 c7 52 fc 29 a0 e8 3f 31 f4 e0 <0f> 0b 48 83 c4 48 b8 ea ff ff ff 5b 5d 41 5c 41 5d 41 5e 41 5f c3
[  137.897343] RSP: 0018:ffffc900006ab978 EFLAGS: 00010286
[  137.897351] RAX: 0000000000000000 RBX: ffff8804a925dfa8 RCX: 0000000000000001
[  137.897356] RDX: 0000000080000001 RSI: ffffffff82124d4a RDI: 00000000ffffffff
[  137.897360] RBP: ffff8804a93e2e98 R08: 0000000099a6f5d8 R09: 0000000000000000
[  137.897365] R10: ffff88049e100000 R11: 0000000000000000 R12: 0000000000000068
[  137.897370] R13: ffff8804a0f37098 R14: ffff8804a93e2e98 R15: ffff8804a7de4138
[  137.897375] FS:  0000000000000000(0000) GS:ffff8804b0680000(0000) knlGS:0000000000000000
[  137.897379] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  137.897385] CR2: 00007f69fe7cebb0 CR3: 0000000005210001 CR4: 0000000000760ee0
[  137.897390] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  137.897394] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  137.897398] PKRU: 55555554
[  137.897402] Call Trace:
[  137.897414]  ? lock_acquire+0xa6/0x1c0
[  137.897480]  ? intel_fbc_choose_crtc+0x1b/0x140 [i915]
[  137.897543]  skl_compute_wm+0x60e/0x1060 [i915]
[  137.897554]  ? mutex_spin_on_owner+0x40/0x140
[  137.897634]  ? intel_atomic_check+0x445/0x10e0 [i915]
[  137.897703]  intel_atomic_check+0x461/0x10e0 [i915]
[  137.897714]  ? mark_held_locks+0x50/0x80
[  137.897727]  drm_atomic_check_only+0x422/0x670
[  137.897739]  drm_atomic_commit+0xe/0x50
[  137.897746]  __drm_atomic_helper_disable_all.constprop.14+0x124/0x150
[  137.897754]  drm_atomic_helper_suspend+0x76/0xd0
[  137.897817]  intel_display_suspend+0xd/0x50 [i915]
[  137.897853]  i915_drm_suspend+0x39/0x100 [i915]
[  137.897861]  pci_pm_suspend+0x6d/0x120
[  137.897866]  ? pci_pm_freeze+0xc0/0xc0
[  137.897872]  dpm_run_callback+0x64/0x280
[  137.897880]  __device_suspend+0x11f/0x5b0
[  137.897888]  ? dpm_watchdog_set+0x60/0x60
[  137.897899]  async_suspend+0x15/0x90
[  137.897905]  async_run_entry_fn+0x34/0x160
[  137.897913]  process_one_work+0x245/0x610
[  137.897925]  worker_thread+0x37/0x380
[  137.897934]  ? process_one_work+0x610/0x610
[  137.897938]  kthread+0x119/0x130
[  137.897942]  ? kthread_park+0x80/0x80
[  137.897951]  ret_from_fork+0x3a/0x50
[  137.897968] irq event stamp: 1136
[  137.897973] hardirqs last  enabled at (1135): [<ffffffff810f984e>] vprintk_emit+0x2ee/0x310
[  137.897978] hardirqs last disabled at (1136): [<ffffffff81001910>] trace_hardirqs_off_thunk+0x1a/0x1c
[  137.897983] softirqs last  enabled at (786): [<ffffffff81c0031d>] __do_softirq+0x31d/0x483
[  137.897988] softirqs last disabled at (767): [<ffffffff8108c359>] irq_exit+0xa9/0xc0
[  137.898025] WARNING: CPU: 2 PID: 588 at drivers/gpu/drm/i915/intel_pm.c:4786 skl_compute_wm_levels+0x361/0x690 [i915]
[  137.898028] ---[ end trace a9e7bee318e557ab ]---