[Bug 85906] New: [BSW]igt/kms_setmode sporadically causes *ERROR* CPU pipe C FIFO underrun

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85906

            Bug ID: 85906
           Summary: [BSW]igt/kms_setmode sporadically causes *ERROR* CPU
                    pipe C FIFO underrun
           Product: DRI
           Version: unspecified
          Hardware: All
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: huax.lu at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

==System Environment==
--------------------------
Regression:  not sure

Non-working platforms: BSW

==kernel==
--------------------------
drm-intel-nightly/f56717bdf29eb7d6a9ec15f095ea2a6858895473

==Bug detailed description==
--------------------------
It sporadically fails on BSW with -nightly kernel, fail rate:3/5.

output:
IGT-Version: 1.8-ge622850 (x86_64) (Linux:
3.18.0-rc3_drm-intel-nightly_f56717_20141105+ x86_64)
Testing: clone-exclusive-crtc 2 connector combinations
  Test id#1 CRTC count 2
    CRTC[8] [Pipe A] Mode: 1920x1080 at 60Hz Connectors: eDP-1[29]
    CRTC[13] [Pipe B] Mode: 640x480 at 60Hz Connectors: HDMI-A-1[22] (NC)
  Test id#2 CRTC count 2
    CRTC[13] [Pipe B] Mode: 1920x1080 at 60Hz Connectors: eDP-1[29]
    CRTC[8] [Pipe A] Mode: 640x480 at 60Hz Connectors: HDMI-A-1[22] (NC)
  Test id#3 CRTC count 2
    CRTC[8] [Pipe A] Mode: 1920x1080 at 60Hz Connectors: eDP-1[29]
    CRTC[18] [Pipe C] Mode: 640x480 at 60Hz Connectors: HDMI-A-2[35] (NC)
  Test id#4 CRTC count 2
    CRTC[13] [Pipe B] Mode: 1920x1080 at 60Hz Connectors: eDP-1[29]
    CRTC[18] [Pipe C] Mode: 640x480 at 60Hz Connectors: HDMI-A-2[35] (NC)
  Test id#5 CRTC count 2
    CRTC[8] [Pipe A] Mode: 640x480 at 60Hz Connectors: HDMI-A-1[22] (NC)
    CRTC[18] [Pipe C] Mode: 640x480 at 60Hz Connectors: HDMI-A-2[35] (NC)
  Test id#6 CRTC count 2
    CRTC[13] [Pipe B] Mode: 640x480 at 60Hz Connectors: HDMI-A-1[22] (NC)
    CRTC[18] [Pipe C] Mode: 640x480 at 60Hz Connectors: HDMI-A-2[35] (NC)
Testing: clone-exclusive-crtc 3 connector combinations
  Test id#7 CRTC count 3
    CRTC[8] [Pipe A] Mode: 1920x1080 at 60Hz Connectors: eDP-1[29]
    CRTC[13] [Pipe B] Mode: 640x480 at 60Hz Connectors: HDMI-A-1[22] (NC)
    CRTC[18] [Pipe C] Mode: 640x480 at 60Hz Connectors: HDMI-A-2[35] (NC)
  Test id#8 CRTC count 3
    CRTC[13] [Pipe B] Mode: 1920x1080 at 60Hz Connectors: eDP-1[29]
    CRTC[8] [Pipe A] Mode: 640x480 at 60Hz Connectors: HDMI-A-1[22] (NC)
    CRTC[18] [Pipe C] Mode: 640x480 at 60Hz Connectors: HDMI-A-2[35] (NC)
Subtest clone-exclusive-crtc: SUCCESS (50.313s)

[   59.872283] WARNING: CPU: 1 PID: 3796 at drivers/gpu/drm/drm_irq.c:1089
drm_wait_one_vblank+0x10e/0x16c [drm]()
[   59.872288] vblank wait timed out on crtc 0
[   59.872291] Modules linked in: dm_mod iTCO_wdt iTCO_vendor_support
snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic serio_raw pcspkr
i2c_i801 lpc_ich mfd_core s
nd_hda_intel snd_hda_controller snd_hda_codec snd_hwdep snd_pcm snd_timer snd
soundcore battery ac acpi_cpufreq i915 button video drm_kms_helper drm
cfbfillrect cfbimgblt cfbcop
yarea option usb_wwan usbserial
[   59.872340] CPU: 1 PID: 3796 Comm: kms_setmode Tainted: G        W     
3.18.0-rc3_drm-intel-nightly_f56717_20141105+ #1198
[   59.872345]  0000000000000000 0000000000000009 ffffffff81789002
ffff88017a627a88
[   59.872352]  ffffffff810368cc ffff88017ab80000 ffffffffa006aa9e
ffff88017ab80000
[   59.872358]  0000000000000000 ffff8801759bb000 0000000000000000
0000000000000283
[   59.872366] Call Trace:
[   59.872380]  [<ffffffff81789002>] ? dump_stack+0x41/0x51
[   59.872390]  [<ffffffff810368cc>] ? warn_slowpath_common+0x78/0x90
[   59.872405]  [<ffffffffa006aa9e>] ? drm_wait_one_vblank+0x10e/0x16c [drm]
[   59.872414]  [<ffffffff8103697c>] ? warn_slowpath_fmt+0x45/0x4a
[   59.872423]  [<ffffffff8105f5df>] ? prepare_to_wait_event+0xb0/0xec
[   59.872438]  [<ffffffffa006aa9e>] ? drm_wait_one_vblank+0x10e/0x16c [drm]
[   59.872445]  [<ffffffff8105f8e9>] ? add_wait_queue+0x3c/0x3c
[   59.872484]  [<ffffffffa0124033>] ? i9xx_crtc_disable+0x66/0x353 [i915]
[   59.872520]  [<ffffffffa0128218>] ? __intel_set_mode+0xd60/0x13d4 [i915]
[   59.872527]  [<ffffffff8178610f>] ? printk+0x4f/0x54
[   59.872543]  [<ffffffffa006bff7>] ? drm_ut_debug_printk+0x59/0x5e [drm]
[   59.872579]  [<ffffffffa012a9da>] ? intel_set_mode+0xd/0x27 [i915]
[   59.872615]  [<ffffffffa012b5fd>] ? intel_crtc_set_config+0x767/0xac1 [i915]
[   59.872634]  [<ffffffffa0070f21>] ? drm_mode_set_config_internal+0x48/0xbd
[drm]
[   59.872652]  [<ffffffffa0074934>] ? drm_mode_setcrtc+0x3e6/0x48b [drm]
[   59.872668]  [<ffffffffa0069738>] ? drm_ioctl+0x279/0x3bc [drm]
[   59.872676]  [<ffffffff810e86b6>] ? tlb_finish_mmu+0xb/0x2f
[   59.872693]  [<ffffffffa007454e>] ? drm_mode_setplane+0x1ce/0x1ce [drm]
[   59.872708]  [<ffffffffa0068ac7>] ? drm_gem_vm_close+0x2a/0x4b [drm]
[   59.872716]  [<ffffffff8111a53f>] ? do_vfs_ioctl+0x3ec/0x435
[   59.872724]  [<ffffffff8109d57a>] ? __audit_syscall_entry+0xb2/0xd2
[   59.872732]  [<ffffffff8100d27c>] ? syscall_trace_enter_phase1+0x11e/0x127
[   59.872739]  [<ffffffff8111a5d1>] ? SyS_ioctl+0x49/0x78
[   59.872745]  [<ffffffff8109d7a3>] ? __audit_syscall_exit+0x209/0x225
[   59.872753]  [<ffffffff8178e692>] ? system_call_fastpath+0x12/0x17
[   59.872757] ---[ end trace 9dd1ea0a051c93e4 ]---


==Reproduce steps==
---------------------------- 
1. ./kms_setmode --run-subtest clone-exclusive-crtc

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