[Bug 80123] [HSW Bisected]igt/drv_suspend and kms_flip causes " WARNING: CPU: 5 PID: 4253 at drivers/gpu/drm/i915/intel_display.c:7305 hsw_enable_pc8+0xeb/0x54d [i915]()" sporadically

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=80123

--- Comment #4 from Guo Jinxian <jinxianx.guo at intel.com> ---
Created attachment 101389
  --> https://bugs.freedesktop.org/attachment.cgi?id=101389&action=edit
dmesg

This bug still able to reproduce on latest
-nightly(00aac34ebc9326666425537316f030cd200365f4) on BDW while running case
igt/pm_rpm/system-suspend

Dmesg:
[  126.575977] WARNING: CPU: 3 PID: 4435 at
drivers/gpu/drm/i915/intel_display.c:7326 hsw_enable_pc8+0x29d/0x54d [i915]()
[  126.575978] IRQs enabled
[  126.575990] Modules linked in: dm_mod iTCO_wdt iTCO_vendor_support ppdev
snd_hda_codec_hdmi pcspkr i2c_i801 snd_hda_intel snd_hda_controller
snd_hda_codec snd_hwdep lpc_ich mfd_core snd_pcm snd_timer snd soundcore
battery parport_pc parport ac acpi_cpufreq i915 video button drm_kms_helper drm
[  126.575993] CPU: 3 PID: 4435 Comm: kworker/u16:6 Tainted: G        W    
3.16.0-rc1_drm-intel-nightly_00aac3_20140619+ #3698
[  126.575998] Workqueue: events_unbound async_run_entry_fn
[  126.576000]  0000000000000000 0000000000000009 ffffffff8177f44d
ffff880002cafcc8
[  126.576002]  ffffffff8103983c 0000000000000246 ffffffffa00acec3
000000000000020c
[  126.576004]  ffff880002f30000 ffff880002c9bb60 ffff880002c9bb68
ffffffffa0064144
[  126.576004] Call Trace:
[  126.576009]  [<ffffffff8177f44d>] ? dump_stack+0x41/0x51
[  126.576012]  [<ffffffff8103983c>] ? warn_slowpath_common+0x78/0x90
[  126.576023]  [<ffffffffa00acec3>] ? hsw_enable_pc8+0x29d/0x54d [i915]
[  126.576031]  [<ffffffffa0064144>] ? i915_pm_thaw_early+0x9/0x9 [i915]
[  126.576033]  [<ffffffff810398ec>] ? warn_slowpath_fmt+0x45/0x4a
[  126.576043]  [<ffffffffa00acec3>] ? hsw_enable_pc8+0x29d/0x54d [i915]
[  126.576050]  [<ffffffffa0064178>] ? i915_pm_suspend_late+0x34/0x4d [i915]
[  126.576054]  [<ffffffff813df34c>] ? dpm_run_callback+0x57/0xcf
[  126.576057]  [<ffffffff813df4f1>] ? __device_suspend_late+0x12d/0x15d
[  126.576060]  [<ffffffff8105a7c7>] ? ttwu_do_wakeup+0xf/0xb9
[  126.576063]  [<ffffffff813df537>] ? async_suspend_late+0x16/0x7d
[  126.576065]  [<ffffffff8105686b>] ? async_run_entry_fn+0x55/0x10b
[  126.576067]  [<ffffffff8104d5f6>] ? process_one_work+0x1e2/0x363
[  126.576069]  [<ffffffff8104ddd6>] ? worker_thread+0x2f2/0x3f1
[  126.576070]  [<ffffffff8104dae4>] ? pool_mayday_timeout+0xf2/0xf2
[  126.576073]  [<ffffffff8105254a>] ? kthread+0xc5/0xcd
[  126.576076]  [<ffffffff81052485>] ? kthread_freezable_should_stop+0x40/0x40
[  126.576078]  [<ffffffff81784eec>] ? ret_from_fork+0x7c/0xb0
[  126.576080]  [<ffffffff81052485>] ? kthread_freezable_should_stop+0x40/0x40

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