[Bug 101705] New: [BAT][BYT] WARN intel_uncore.c:792 __unclaimed_reg_debug (reg 0x1f0034)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101705

            Bug ID: 101705
           Summary: [BAT][BYT] WARN intel_uncore.c:792
                    __unclaimed_reg_debug (reg 0x1f0034)
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: martin.peres at free.fr
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Our two baytrails starting reporting the following warning randomly when
running igt at kms_pipe_crc_basic@suspend-read-crc-pipe-b, starting from
CI_DRM_2783:

[  446.057678] Unclaimed read from register 0x1f0034
[  446.057755] ------------[ cut here ]------------
[  446.057816] WARNING: CPU: 0 PID: 2936 at
drivers/gpu/drm/i915/intel_uncore.c:792 __unclaimed_reg_debug+0x3e/0x50 [i915]
[  446.057820] Modules linked in: vgem snd_hda_codec_hdmi snd_hda_codec_realtek
snd_hda_codec_generic snd_hda_intel snd_hda_codec intel_powerclamp coretemp
crct10dif_pclmul crc32_pclmul snd_hwdep ghash_clmulni_intel snd_hda_core
snd_pcm i915 r8169 mii lpc_ich i2c_hid i2c_designware_platform
i2c_designware_core prime_numbers
[  446.057915] CPU: 0 PID: 2936 Comm: kworker/u8:14 Tainted: G     U         
4.12.0-CI-CI_DRM_2804+ #1
[  446.057919] Hardware name: GIGABYTE GB-BXBT-1900/MZBAYAB-00, BIOS F6
02/17/2015
[  446.057928] Workqueue: events_unbound async_run_entry_fn
[  446.057936] task: ffff88010d2e8040 task.stack: ffffc90000430000
[  446.057991] RIP: 0010:__unclaimed_reg_debug+0x3e/0x50 [i915]
[  446.057996] RSP: 0018:ffffc90000433978 EFLAGS: 00010096
[  446.058004] RAX: 0000000000000025 RBX: 0000000000000000 RCX:
0000000000000002
[  446.058009] RDX: 0000000000000000 RSI: ffffffff81cba24f RDI:
ffffffff81c99957
[  446.058013] RBP: ffffc90000433990 R08: 0000000000000000 R09:
0000000000000001
[  446.058017] R10: ffffc90000433908 R11: fc8c7a4200000000 R12:
00000000001f0034
[  446.058021] R13: 0000000000000001 R14: 00000000ffffffff R15:
ffff8801321c0b98
[  446.058026] FS:  0000000000000000(0000) GS:ffff88013fc00000(0000)
knlGS:0000000000000000
[  446.058031] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  446.058035] CR2: 00007f0b0d26f028 CR3: 0000000135678000 CR4:
00000000001006f0
[  446.058039] Call Trace:
[  446.058099]  fwtable_read32+0x278/0x2c0 [i915]
[  446.058153]  vlv_program_watermarks+0x41e/0x770 [i915]
[  446.058213]  vlv_optimize_watermarks+0xa1/0xc0 [i915]
[  446.058273]  intel_atomic_commit_tail+0x339/0xf70 [i915]
[  446.058343]  intel_atomic_commit+0x3fb/0x500 [i915]
[  446.058353]  ? drm_atomic_check_only+0x370/0x560
[  446.058405]  ? intel_runtime_pm_put+0x51/0xa0 [i915]
[  446.058416]  drm_atomic_commit+0x46/0x50
[  446.058425]  drm_atomic_helper_commit_duplicated_state+0xbf/0xd0
[  446.058482]  __intel_display_resume+0x81/0xc0 [i915]
[  446.058541]  intel_display_resume+0xca/0xf0 [i915]
[  446.058601]  i915_pm_restore+0xef/0x190 [i915]
[  446.058652]  i915_pm_resume+0x9/0x10 [i915]
[  446.058659]  pci_pm_resume+0x5f/0x90
[  446.058668]  dpm_run_callback+0x6f/0x330
[  446.058673]  ? pci_pm_thaw+0x90/0x90
[  446.058682]  device_resume+0xac/0x1e0
[  446.058691]  ? dpm_watchdog_set+0x60/0x60
[  446.058703]  async_resume+0x18/0x40
[  446.058709]  async_run_entry_fn+0x34/0x160
[  446.058719]  process_one_work+0x1fe/0x670
[  446.058732]  worker_thread+0x49/0x3b0
[  446.058744]  kthread+0x10f/0x150
[  446.058750]  ? process_one_work+0x670/0x670
[  446.058756]  ? kthread_create_on_node+0x40/0x40
[  446.058765]  ret_from_fork+0x27/0x40
[  446.058781] Code: de ff ff 38 d8 76 2d 45 84 ed 48 c7 c0 9d 89 18 a0 48 c7
c6 a7 89 18 a0 48 0f 45 f0 44 89 e2 48 c7 c7 b0 89 18 a0 e8 7b a6 0c e1 <0f> ff
83 2d 45 32 12 00 01 5b 41 5c 41 5d 5d c3 66 90 55 48 89 
[  446.059026] ---[ end trace cc38744b313e72cf ]---

This may be linked to this bug:
https://bugs.freedesktop.org/show_bug.cgi?id=101516

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