[Bug 82490] [BYT/BSW]WARNING:at drivers/gpu/drm/drm_irq.c:1058 drm_wait_one_vblank+0x32/0x157 after boot

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=82490

--- Comment #2 from lu hua <huax.lu at intel.com> ---
Run kms_flip case on BDW, it also reports this warning.
output:
IGT-Version: 1.7-g5c7bcb1 (x86_64) (Linux:
3.16.0_drm-intel-nightly_da31e7_20140814+ x86_64)
Using monotonic timestamps
Beginning bcs-flip-vs-dpms on crtc 7, connector 19
  1920x1080 60 1920 1966 1996 2080 1080 1082 1086 1112 0xa 0x48 138780
....
bcs-flip-vs-dpms on crtc 7, connector 19: PASSED

Beginning bcs-flip-vs-dpms on crtc 12, connector 19
  1920x1080 60 1920 1966 1996 2080 1080 1082 1086 1112 0xa 0x48 138780
....
bcs-flip-vs-dpms on crtc 12, connector 19: PASSED

Beginning bcs-flip-vs-dpms on crtc 16, connector 19
  1920x1080 60 1920 1966 1996 2080 1080 1082 1086 1112 0xa 0x48 138780
....
bcs-flip-vs-dpms on crtc 16, connector 19: PASSED

Subtest bcs-flip-vs-dpms: SUCCESS

dmesg: 
[  113.195906] WARNING: CPU: 0 PID: 4388 at drivers/gpu/drm/drm_irq.c:1067
drm_wait_one_vblank+0xf6/0x157 [drm]()
[  113.195907] Modules linked in: dm_mod snd_hda_codec_hdmi iTCO_wdt
iTCO_vendor_support ppdev pcspkr i2c_i801 snd_hda_intel snd_hda_controller
snd_hda_codec snd_hwdep snd_pcm snd_timer lpc_ich mfd_core snd soundcore
battery parport_pc parport ac acpi_cpufreq i915 button video drm_kms_helper drm
[  113.195923] CPU: 0 PID: 4388 Comm: kms_flip Not tainted
3.16.0_drm-intel-nightly_da31e7_20140814+ #1400
[  113.195925]  0000000000000000 0000000000000009 ffffffff817827d2
0000000000000000
[  113.195927]  ffffffff8103987c 0000000000000246 ffffffffa0005923
0000000000000206
[  113.195930]  ffff880148c91000 0000000000000000 0000000000000001
0000000000000001
[  113.195932] Call Trace:
[  113.195938]  [<ffffffff817827d2>] ? dump_stack+0x41/0x51
[  113.195942]  [<ffffffff8103987c>] ? warn_slowpath_common+0x78/0x90
[  113.195948]  [<ffffffffa0005923>] ? drm_wait_one_vblank+0xf6/0x157 [drm]
[  113.195953]  [<ffffffffa0005923>] ? drm_wait_one_vblank+0xf6/0x157 [drm]
[  113.195957]  [<ffffffff810687c7>] ? __wake_up_sync+0x7/0x7
[  113.195971]  [<ffffffffa00bae75>] ? intel_crtc_enable_planes+0x34/0xd1
[i915]
[  113.195983]  [<ffffffffa00b9011>] ? __intel_set_mode+0x1115/0x121d [i915]
[  113.195986]  [<ffffffff8177f7b1>] ? printk+0x4f/0x54
[  113.195997]  [<ffffffffa00befb9>] ? intel_set_mode+0xd/0x27 [i915]
[  113.196007]  [<ffffffffa00bfbcc>] ? intel_crtc_set_config+0x757/0xa99 [i915]
[  113.196015]  [<ffffffffa000c18b>] ? drm_mode_set_config_internal+0x48/0xbd
[drm]
[  113.196023]  [<ffffffffa000fba6>] ? drm_mode_setcrtc+0x3e6/0x48b [drm]
[  113.196029]  [<ffffffffa0004908>] ? drm_ioctl+0x279/0x3bc [drm]
[  113.196032]  [<ffffffff81060314>] ? set_next_entity+0x14/0x37
[  113.196038]  [<ffffffffa000f7c0>] ? drm_mode_setplane+0x16d/0x16d [drm]
[  113.196042]  [<ffffffff81119d57>] ? do_vfs_ioctl+0x3ec/0x435
[  113.196045]  [<ffffffff8110bfd8>] ? vfs_write+0x127/0x183
[  113.196048]  [<ffffffff81119de9>] ? SyS_ioctl+0x49/0x78
[  113.196051]  [<ffffffff81788312>] ? system_call_fastpath+0x16/0x1b
[  113.196053] ---[ end trace 057594c1ee8b3796 ]---

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