linux-kernel - [lkp] [drm/i915] eddfcbcdc27: WARNING: CPU: 2 PID: 568 at drivers/gpu/drm/i915/intel_display.c:9277 hsw_enable

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Date:	Wed, 08 Jul 2015 10:22:26 +0800
From:	Huang Ying <ying.huang@...el.com>
To:	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
Cc:	Daniel Vetter <daniel.vetter@...ll.ch>,
	LKML <linux-kernel@...r.kernel.org>, LKP ML <lkp@...org>
Subject: [lkp] [drm/i915] eddfcbcdc27: WARNING: CPU: 2 PID: 568 at
 drivers/gpu/drm/i915/intel_display.c:9277 hsw_enable_pc8+0xab/0x7b0 [i915]()

FYI, we noticed the below changes on

git://anongit.freedesktop.org/drm-intel drm-intel-next-queued
commit eddfcbcdc27fbecb33bff098967bbdd7ca75bfa6 ("drm/i915: Update less state during modeset.")


+-------------------------------------------------------------------------+------------+------------+
>                                                                         | a539205a16 | eddfcbcdc2 |
+-------------------------------------------------------------------------+------------+------------+
> boot_successes                                                          | 20         | 3          |
> boot_failures                                                           | 2          | 12         |
> drm:gen8_irq_handler[i915]]                                             | 1          |            |
> drm:intel_pipe_update_end[i915]]                                        | 1          | 1          |
> WARNING:at_drivers/gpu/drm/i915/intel_display.c:#hsw_enable_pc8[i915]() | 0          | 12         |
> backtrace:async_run_entry_fn                                            | 0          | 12         |
+-------------------------------------------------------------------------+------------+------------+


[   25.416303] PM: suspend of devices complete after 385.609 msecs
[   25.416305] PM: suspend devices took 0.386 seconds
[   25.429140] ------------[ cut here ]------------
[   25.429161] WARNING: CPU: 2 PID: 568 at drivers/gpu/drm/i915/intel_display.c:9277 hsw_enable_pc8+0xab/0x7b0 [i915]()
[   25.429161] CRTC for pipe A enabled
[   25.429186] Modules linked in: rpcsec_gss_krb5 auth_rpcgss nfsv4 dns_resolver snd_hda_codec_hdmi x86_pkg_temp_thermal coretemp kvm_intel kvm crct10dif_pclmul i915 crc32_pclmul crc32c_intel ghash_clmulni_intel drm_kms_helper aesni_intel lrw gf128mul glue_helper ablk_helper snd_hda_intel cryptd ppdev snd_hda_controller snd_hda_codec snd_hda_core serio_raw snd_hwdep microcode pcspkr snd_pcm drm i2c_i801 shpchp snd_timer snd soundcore i2c_hid winbond_cir rc_core parport_pc parport sdhci_acpi sdhci mmc_core video dw_dmac dw_dmac_core i2c_designware_platform i2c_designware_core spi_pxa2xx_platform acpi_pad
[   25.429188] CPU: 2 PID: 568 Comm: kworker/u16:4 Not tainted 4.1.0-rc6-00697-geddfcbc #18
[   25.429189] Hardware name: Intel Corporation Broadwell Client platform/WhiteTip Mountain 1, BIOS BDW-E1R1.86C.0120.R00.1504020241 04/02/2015
[   25.429192] Workqueue: events_unbound async_run_entry_fn
[   25.429194]  ffffffffa0583158 ffff88007abafbe8 ffffffff818e4f79 ffffffff81d2dcf8
[   25.429196]  ffff88007abafc38 ffff88007abafc28 ffffffff8107672a 00000000fffbc913
[   25.429197]  ffff88007a190000 ffff880137126000 ffff8800abe46380 ffff8800abe46000
[   25.429197] Call Trace:
[   25.429202]  [<ffffffff818e4f79>] dump_stack+0x4c/0x65
[   25.429204]  [<ffffffff8107672a>] warn_slowpath_common+0x8a/0xc0
[   25.429206]  [<ffffffff810767a6>] warn_slowpath_fmt+0x46/0x50
[   25.429221]  [<ffffffffa052579b>] hsw_enable_pc8+0xab/0x7b0 [i915]
[   25.429228]  [<ffffffffa04ae528>] intel_suspend_complete+0x688/0x710 [i915]
[   25.429234]  [<ffffffffa04ae5d2>] i915_drm_suspend_late+0x22/0x90 [i915]
[   25.429240]  [<ffffffffa04ae740>] ? i915_pm_poweroff_late+0x30/0x30 [i915]
[   25.429246]  [<ffffffffa04ae769>] i915_pm_suspend_late+0x29/0x30 [i915]
[   25.429249]  [<ffffffff81577e2c>] dpm_run_callback+0x4c/0x130
[   25.429251]  [<ffffffff81578720>] __device_suspend_late+0xb0/0x1a0
[   25.429254]  [<ffffffff81013723>] ? __switch_to+0x263/0x5e0
[   25.429256]  [<ffffffff8157882f>] async_suspend_late+0x1f/0xa0
[   25.429258]  [<ffffffff81098e2a>] async_run_entry_fn+0x4a/0x150
[   25.429260]  [<ffffffff8108fb98>] process_one_work+0x158/0x490
[   25.429261]  [<ffffffff810907f3>] worker_thread+0x73/0x580
[   25.429263]  [<ffffffff81090780>] ? rescuer_thread+0x400/0x400
[   25.429264]  [<ffffffff81095f5f>] kthread+0xef/0x110
[   25.429266]  [<ffffffff81095e70>] ? kthread_create_on_node+0x180/0x180
[   25.429268]  [<ffffffff818ed762>] ret_from_fork+0x42/0x70
[   25.429269]  [<ffffffff81095e70>] ? kthread_create_on_node+0x180/0x180
[   25.429270] ---[ end trace dc42b13da2872ff3 ]---
[   25.440253] PM: late suspend of devices complete after 23.950 msecs

To reproduce:

        git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git
        cd lkp-tests
        bin/lkp install job.yaml  # job file is attached in this email
        bin/lkp run     job.yaml

Thanks,
Ying Huang

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