[Bug 81160] [BYT Regression]igt/kms_flip some subcases cause "WARNING: CPU: 0 PID: 3733 at drivers/gpu/drm/i915/intel_display.c:1231 __intel_set_mode+0xc59/0x1275 [i915]()"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81160

--- Comment #1 from yaoming <ming.yao at intel.com> ---
This bug can't reproduce on 3.16.0-rc4_drm-intel-next-queued_17c58f_20140803

Dmesg shows:
[    3.434513] WARNING: CPU: 0 PID: 1231 at
drivers/gpu/drm/i915/intel_dp.c:1202 intel_enable_dp+0x41/0x79 [i915]()
[    3.434513] eDP VDD already requested on
[    3.434519] Modules linked in: i915(+) video button drm_kms_helper drm
[    3.434522] CPU: 0 PID: 1231 Comm: udevd Not tainted
3.16.0-rc4_drm-intel-next-queued_17c58f_20140803+ #1056
[    3.434526]  0000000000000000 0000000000000009 ffffffff8177fe4d
ffff880071293418
[    3.434529]  ffffffff8103986c ffff880071123000 ffffffffa00d04bc
00000000001e1204
[    3.434531]  ffff880002d6f0d8 ffff880002db0000 ffff880002d6f0d8
ffff880075e8e000
[    3.434532] Call Trace:
[    3.434540]  [<ffffffff8177fe4d>] ? dump_stack+0x41/0x51
[    3.434544]  [<ffffffff8103986c>] ? warn_slowpath_common+0x78/0x90
[    3.434585]  [<ffffffffa00d04bc>] ? intel_enable_dp+0x41/0x79 [i915]
[    3.434588]  [<ffffffff8103991c>] ? warn_slowpath_fmt+0x45/0x4a
[    3.434628]  [<ffffffffa00d04bc>] ? intel_enable_dp+0x41/0x79 [i915]
[    3.434684]  [<ffffffffa00d060a>] ? vlv_pre_enable_dp+0x100/0x11a [i915]
[    3.434725]  [<ffffffffa00b7e82>] ? valleyview_crtc_enable+0xae7/0xbdb
[i915]
[    3.434765]  [<ffffffffa00b50ba>] ? __intel_set_mode+0x111c/0x1224 [i915]
[    3.434770]  [<ffffffff81060300>] ? __dequeue_entity+0x19/0x2d
[    3.434810]  [<ffffffffa00bb318>] ? intel_set_mode+0xd/0x27 [i915]
[    3.434850]  [<ffffffffa00bbf47>] ? intel_crtc_set_config+0x757/0xaad [i915]
[    3.434862]  [<ffffffffa000bf1d>] ? drm_mode_set_config_internal+0x4b/0xb3
[drm]
[    3.434867]  [<ffffffffa0050a5a>] ? restore_fbdev_mode+0x8f/0xa8
[drm_kms_helper]
[    3.434871]  [<ffffffffa0050a90>] ?
drm_fb_helper_restore_fbdev_mode_unlocked+0x1d/0x34 [drm_kms_helper]
[    3.434875]  [<ffffffffa0051db7>] ? drm_fb_helper_set_par+0x3a/0x58
[drm_kms_helper]
[    3.434914]  [<ffffffffa00c4f04>] ? intel_fbdev_set_par+0x11/0x55 [i915]
[    3.434918]  [<ffffffff813650c9>] ? fbcon_init+0x2ff/0x408
[    3.434922]  [<ffffffff813b8d1d>] ? visual_init+0xaf/0x102
[    3.434925]  [<ffffffff813ba4ba>] ? do_bind_con_driver+0x1a1/0x2ca
[    3.434928]  [<ffffffff813ba715>] ? do_take_over_console+0x132/0x162
[    3.434931]  [<ffffffff813647b6>] ? do_fbcon_takeover+0x53/0x96
[    3.434934]  [<ffffffff81055751>] ? notifier_call_chain+0x2e/0x59
[    3.434937]  [<ffffffff81055890>] ? __blocking_notifier_call_chain+0x43/0x5d
[    3.434941]  [<ffffffff8136e37d>] ? register_framebuffer+0x23f/0x29d
[    3.434945]  [<ffffffffa005157e>] ? drm_fb_helper_initial_config+0x359/0x3ff
[drm_kms_helper]
[    3.434983]  [<ffffffffa00a610a>] ? gen6_write32+0x6c/0xbf [i915]
[    3.435043]  [<ffffffffa00e3b41>] ? i915_driver_load+0xcaa/0xedb [i915]
[    3.435049]  [<ffffffff8104a78e>] ? call_usermodehelper_exec+0xf4/0xff
[    3.435052]  [<ffffffff81040000>] ? ptrace_regset+0x61/0xf8
[    3.435056]  [<ffffffff8132bdde>] ? kobject_uevent_env+0x486/0x4c8
[    3.435059]  [<ffffffff813d4bd0>] ? get_device+0x10/0x1c
[    3.435062]  [<ffffffff813d6495>] ? device_add+0x50b/0x51c
[    3.435066]  [<ffffffff8132999e>] ? idr_replace+0x2d/0x93
[    3.435074]  [<ffffffffa000761f>] ? drm_dev_register+0x74/0xe7 [drm]
[    3.435078]  [<ffffffff8137ebfa>] ? acpi_pci_irq_enable+0x11c/0x12f
[    3.435087]  [<ffffffffa00097a6>] ? drm_get_pci_dev+0xf4/0x1af [drm]
[    3.435090]  [<ffffffff81350d4a>] ? local_pci_probe+0x36/0x7c
[    3.435092]  [<ffffffff8132a211>] ? ida_get_new_above+0x171/0x18b
[    3.435095]  [<ffffffff81350fee>] ? pci_device_probe+0xcc/0xf0
[    3.435098]  [<ffffffff813d8556>] ? driver_probe_device+0x9d/0x1d5
[    3.435101]  [<ffffffff813d868e>] ? driver_probe_device+0x1d5/0x1d5
[    3.435104]  [<ffffffff813d86e1>] ? __driver_attach+0x53/0x73
[    3.435107]  [<ffffffff813d6e4e>] ? bus_for_each_dev+0x4e/0x7f
[    3.435109]  [<ffffffff813d7e04>] ? bus_add_driver+0xe7/0x1cc
[    3.435112]  [<ffffffff813d8d2a>] ? driver_register+0x82/0xb5
[    3.435115]  [<ffffffffa0124000>] ? 0xffffffffa0123fff
[    3.435118]  [<ffffffff81000301>] ? do_one_initcall+0xe3/0x176
[    3.435121]  [<ffffffff8108bf6d>] ? load_module+0x1821/0x1b04
[    3.435125]  [<ffffffff81089b8d>] ? module_unload_free+0xca/0xca
[    3.435128]  [<ffffffff8108c2e0>] ? SyS_init_module+0x90/0x9b
[    3.435131]  [<ffffffff817859d2>] ? system_call_fastpath+0x16/0x1b
[    3.435133] ---[ end trace a340767a1ac5f92d ]---

This issue is tracked by Bug 81697.

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