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<base href="https://bugs.freedesktop.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [BAT][BYT] WARN intel_uncore.c:792 __unclaimed_reg_debug (reg 0x1f0034)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=101705">101705</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>[BAT][BYT] WARN intel_uncore.c:792 __unclaimed_reg_debug (reg 0x1f0034)
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr>
<tr>
<th>Version</th>
<td>DRI git
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Other
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Component</th>
<td>DRM/Intel
</td>
</tr>
<tr>
<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>martin.peres@free.fr
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr></table>
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<div>
<pre>Our two baytrails starting reporting the following warning randomly when
running igt@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:
<a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED - [BAT][BYT] WARN intel_uncore.c:792 __unclaimed_reg_debug (reg 0x18650c)"
href="show_bug.cgi?id=101516">https://bugs.freedesktop.org/show_bug.cgi?id=101516</a></pre>
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