[Bug 85301] New: [HSW] Unclaimed register detected after suspend/resume

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85301

            Bug ID: 85301
           Summary: [HSW] Unclaimed register detected after suspend/resume
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: patrik.lundquist at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 108208
  --> https://bugs.freedesktop.org/attachment.cgi?id=108208&action=edit
Linux 3.18-rc1 dmesg with drm.debug=0xe i915.mmio_debug=1

Unclaimed register detected before reading register 0xc7204 after a couple of
suspend/resume using Linux v3.18-rc1.


[ 2783.939808] ------------[ cut here ]------------
[ 2783.939835] WARNING: CPU: 0 PID: 4819 at
/home/apw/COD/linux/drivers/gpu/drm/i915/intel_uncore.c:528
hsw_unclaimed_reg_debug.isra.17+0x80/0xa0 [i915]()
[ 2783.939836] Unclaimed register detected before reading register 0xc7204
[ 2783.939856] Modules linked in: ctr ccm arc4 iwlmvm mac80211 iwlwifi
intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm joydev
cfg80211 rtc_efi serio_raw snd_hda_codec_realtek snd_hda_codec_hdmi
snd_hda_codec_generic thinkpad_acpi nvram snd_hda_intel lpc_ich
snd_hda_controller snd_hda_codec snd_hwdep snd_pcm mac_hid rtsx_pci_ms
intel_smartconnect snd_seq_midi memstick snd_seq_midi_event btusb rfcomm shpchp
bnep bluetooth snd_rawmidi snd_seq snd_seq_device snd_timer snd soundcore
binfmt_misc parport_pc ppdev nls_iso8859_1 lp parport sch_fq dm_crypt
rtsx_pci_sdmmc crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel
aes_x86_64 lrw gf128mul glue_helper ablk_helper i915 cryptd psmouse e1000e ahci
i2c_algo_bit libahci ptp drm_kms_helper rtsx_pci pps_core drm wmi video [last
unloaded: ipmi_msghandler]
[ 2783.939858] CPU: 0 PID: 4819 Comm: kworker/0:3 Tainted: G        W     
3.18.0-031800rc1-generic #201410192135
[ 2783.939859] Hardware name: LENOVO 20AM009DMS/20AM009DMS, BIOS GIET76WW (2.26
) 08/27/2014
[ 2783.939874] Workqueue: events edp_panel_vdd_work [i915]
[ 2783.939876]  0000000000000210 ffff880231aa7c48 ffffffff827a1613
ffffffff82c54168
[ 2783.939877]  ffff880231aa7c98 ffff880231aa7c88 ffffffff82074cfc
0000000000000001
[ 2783.939878]  ffff88022dd70060 00000000000c7204 00000000000c7204
ffff88022dd70068
[ 2783.939879] Call Trace:
[ 2783.939883]  [<ffffffff827a1613>] dump_stack+0x46/0x58
[ 2783.939885]  [<ffffffff82074cfc>] warn_slowpath_common+0x8c/0xc0
[ 2783.939887]  [<ffffffff82074de6>] warn_slowpath_fmt+0x46/0x50
[ 2783.939901]  [<ffffffffc01a6610>] hsw_unclaimed_reg_debug.isra.17+0x80/0xa0
[i915]
[ 2783.939912]  [<ffffffffc01a85b9>] gen6_read32+0x69/0x170 [i915]
[ 2783.939923]  [<ffffffffc01a8550>] ? gen6_read64+0x160/0x160 [i915]
[ 2783.939936]  [<ffffffffc01dc119>] edp_have_panel_vdd+0x39/0x50 [i915]
[ 2783.939948]  [<ffffffffc01dcce4>] edp_panel_vdd_off_sync+0x44/0x170 [i915]
[ 2783.939959]  [<ffffffffc01dd00a>] edp_panel_vdd_work+0x3a/0x50 [i915]
[ 2783.939962]  [<ffffffff8208d6be>] process_one_work+0x14e/0x460
[ 2783.939964]  [<ffffffff8208e03b>] worker_thread+0x11b/0x3f0
[ 2783.939965]  [<ffffffff8208df20>] ? create_worker+0x1e0/0x1e0
[ 2783.939967]  [<ffffffff82093bb9>] kthread+0xc9/0xe0
[ 2783.939968]  [<ffffffff82093af0>] ? flush_kthread_worker+0x90/0x90
[ 2783.939970]  [<ffffffff827aeebc>] ret_from_fork+0x7c/0xb0
[ 2783.939972]  [<ffffffff82093af0>] ? flush_kthread_worker+0x90/0x90
[ 2783.939973] ---[ end trace c7d449c4daccb3aa ]---
[ 2783.939975] ------------[ cut here ]------------

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