https://intel-gfx-ci.01.org/tree/drm-tip/IGT_4124/fi-skl-6700k2/igt@gem_exec_suspend@basic-s3.html https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3608/fi-skl-6700k2/igt@gem_exec_suspend@basic-s3.html [ 188.178792] Unclaimed write to register 0x66a00 [ 188.178820] WARNING: CPU: 5 PID: 149 at drivers/gpu/drm/i915/intel_uncore.c:986 __unclaimed_reg_debug+0x3b/0x50 [i915] [ 188.178821] Modules linked in: snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic i915 x86_pkg_temp_thermal intel_powerclamp coretemp crct10dif_pclmul crc32_pclmul snd_hda_intel ghash_clmulni_intel snd_hda_codec snd_hwdep snd_hda_core e1000e mei_me snd_pcm mei ptp pps_core prime_numbers [ 188.178842] CPU: 5 PID: 149 Comm: kworker/u16:2 Tainted: G U 4.15.0-rc7-CI-CI_DRM_3608+ #1 [ 188.178843] Hardware name: System manufacturer System Product Name/Z170 PRO GAMING, BIOS 0802 09/02/2015 [ 188.178846] Workqueue: events_unbound async_run_entry_fn [ 188.178863] RIP: 0010:__unclaimed_reg_debug+0x3b/0x50 [i915] [ 188.178865] RSP: 0018:ffffc90000bb79c8 EFLAGS: 00010096 [ 188.178867] RAX: 0000000000000023 RBX: 0000000000000000 RCX: 0000000000000002 [ 188.178868] RDX: 0000000000000000 RSI: ffffffff82107929 RDI: ffffffff820b8e2e [ 188.178869] RBP: 0000000000066a00 R08: 0000000000000000 R09: 0000000000000001 [ 188.178870] R10: ffffc90000bb7960 R11: 0000000000000001 R12: 0000000000000000 [ 188.178871] R13: 0000000000000000 R14: 0000000000000202 R15: ffff8804383c0008 [ 188.178872] FS: 0000000000000000(0000) GS:ffff880455d40000(0000) knlGS:0000000000000000 [ 188.178873] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 188.178874] CR2: 00007fb25780cfa0 CR3: 0000000005210006 CR4: 00000000003606e0 [ 188.178875] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 188.178876] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 188.178877] Call Trace: [ 188.178895] fwtable_write32+0x27f/0x290 [i915] [ 188.178914] _intel_hdcp_disable+0x6c/0x130 [i915] [ 188.178934] intel_hdcp_disable+0x35/0x60 [i915] [ 188.178952] intel_disable_ddi+0x17/0xf0 [i915] [ 188.178970] intel_encoders_disable.isra.60+0x7a/0x80 [i915] [ 188.178989] haswell_crtc_disable+0x43/0x130 [i915] [ 188.179008] intel_atomic_commit_tail+0x1bb/0xce0 [i915] [ 188.179029] intel_atomic_commit+0x25f/0x320 [i915] [ 188.179035] drm_atomic_helper_disable_all+0x167/0x1a0 [ 188.179039] drm_atomic_helper_suspend+0x3c/0xb0 [ 188.179060] intel_display_suspend+0xd/0x50 [i915] [ 188.179072] i915_drm_suspend+0x79/0x160 [i915] [ 188.179075] ? pci_pm_freeze+0xd0/0xd0 [ 188.179076] pci_pm_suspend+0x74/0x140 [ 188.179079] dpm_run_callback+0x5f/0x310 [ 188.179082] __device_suspend+0xf3/0x5a0 [ 188.179086] ? dpm_watchdog_set+0x60/0x60 [ 188.179091] async_suspend+0x15/0x90 [ 188.179094] async_run_entry_fn+0x2e/0x160 [ 188.179097] process_one_work+0x215/0x640 [ 188.179102] worker_thread+0x48/0x3a0 [ 188.179107] kthread+0xfb/0x130 [ 188.179109] ? process_one_work+0x640/0x640 [ 188.179110] ? _kthread_create_on_node+0x30/0x30 [ 188.179114] ret_from_fork+0x24/0x30 [ 188.179121] Code: 3c 01 75 30 84 db 75 2c 45 84 e4 48 c7 c0 85 75 2c a0 48 c7 c6 7b 75 2c a0 48 0f 44 f0 89 ea 48 c7 c7 8e 75 2c a0 e8 b5 4c e7 e0 <0f> ff 83 2d 4c bc 16 00 01 5b 5d 41 5c c3 0f 1f 80 00 00 00 00
Also on https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3609/fi-skl-6700k2/igt@gem_exec_suspend@basic-s3.html i.e. we have hit this on 3 consecutive runs, so plausible regression.
The backtrace comes from: intel_hdcp.c => static int _intel_hdcp_disable(struct intel_connector *connector) ... I915_WRITE(PORT_HDCP_CONF(port), 0); The register is: [ 188.178792] Unclaimed write to register 0x66a00 intel_reg.h #define _PORTE_HDCP_AUTHENC 0x66A00 intel_hdcp.c was added on CI_DRM_3608: https://patchwork.freedesktop.org/series/34671/ The regression is visible in PW results.
Thanks for raising this. I'll take a look.
Issue is green on: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3617/fi-skl-6700k2/igt@gem_exec_suspend@basic-s3.html so: commit 01468d6c711a31a9fe333d072afa8a4730ef3bf9 Author: Sean Paul <seanpaul@chromium.org> Date: Tue Jan 9 13:53:13 2018 -0500 drm/i915: Only disable HDCP when it's active and commit 2f4498a4ac2f77671587faa99e38c3342d666114 Author: Sean Paul <seanpaul@chromium.org> Date: Tue Jan 9 13:53:51 2018 -0500 drm/i915: Don't allow HDCP on PORT E/F Appear to have fixed it.
Thanks for fixing this so quickly I will close this bug.
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