[Bug 85908] New: [BSW]igt/kms_render causes *ERROR* pipe A underrun

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85908

            Bug ID: 85908
           Summary: [BSW]igt/kms_render causes *ERROR* pipe A 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

Created attachment 108938
  --> https://bugs.freedesktop.org/attachment.cgi?id=108938&action=edit
dmesg

==System Environment==
--------------------------
Regression:  not sure, it also has bug 82649

Non-working platforms: BSW

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

==Bug detailed description==
--------------------------
It causes  [drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR* pipe A
underrun. It also has bug 82649 about fail.

output:
IGT-Version: 1.8-ge622850 (x86_64) (Linux:
3.18.0-rc3_drm-intel-nightly_f56717_20141105+ x86_64)
Beginning test direct-render with 1920x1080 @ 60Hz / RGB565 on pipe A, encoder
TMDS, connector eDP
Test direct-render with 1920x1080 @ 60Hz / RGB565 on pipe A, encoder TMDS,
connector eDP: PASSED
Beginning test direct-render with 1920x1080 @ 60Hz / XRGB8888 on pipe A,
encoder TMDS, connector eDP
Test direct-render with 1920x1080 @ 60Hz / XRGB8888 on pipe A, encoder TMDS,
connector eDP: PASSED
Beginning test direct-render with 1920x1080 @ 60Hz / XRGB2101010 on pipe A,
encoder TMDS, connector eDP
Test direct-render with 1920x1080 @ 60Hz / XRGB2101010 on pipe A, encoder TMDS,
connector eDP: PASSED
Beginning test direct-render with 1920x1080 @ 60Hz / ARGB8888 on pipe A,
encoder TMDS, connector eDP
Test direct-render with 1920x1080 @ 60Hz / ARGB8888 on pipe A, encoder TMDS,
connector eDP: PASSED
Beginning test direct-render with 1920x1080 @ 60Hz / RGB565 on pipe B, encoder
TMDS, connector eDP
Test direct-render with 1920x1080 @ 60Hz / RGB565 on pipe B, encoder TMDS,
connector eDP: PASSED
Beginning test direct-render with 1920x1080 @ 60Hz / XRGB8888 on pipe B,
encoder TMDS, connector eDP
Test direct-render with 1920x1080 @ 60Hz / XRGB8888 on pipe B, encoder TMDS,
connector eDP: PASSED
Beginning test direct-render with 1920x1080 @ 60Hz / XRGB2101010 on pipe B,
encoder TMDS, connector eDP
Test direct-render with 1920x1080 @ 60Hz / XRGB2101010 on pipe B, encoder TMDS,
connector eDP: PASSED
Beginning test direct-render with 1920x1080 @ 60Hz / ARGB8888 on pipe B,
encoder TMDS, connector eDP
Test direct-render with 1920x1080 @ 60Hz / ARGB8888 on pipe B, encoder TMDS,
connector eDP: PASSED
Subtest direct-render: SUCCESS (78.505s)


[root at x-bsw01 tests]# dmesg -r|egrep "<[1-4]>"|grep drm
<3>[  449.807056] [drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR*
pipe B underrun
<3>[  449.807235] [drm:valleyview_pipestat_irq_handler [i915]] *ERROR* CPU pipe
B FIFO underrun
<3>[  459.811162] [drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR*
pipe A underrun
<3>[  468.779569] [drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR*
pipe A underrun
<3>[  479.185122] [drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR*
pipe A underrun
<3>[  488.153517] [drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR*
pipe A underrun
<3>[  498.163350] [drm:valleyview_pipestat_irq_handler [i915]] *ERROR* CPU pipe
B FIFO underrun
<3>[  499.964961] [drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR*
pipe B underrun
<3>[  499.964998] [drm:valleyview_pipestat_irq_handler [i915]] *ERROR* CPU pipe
B FIFO underrun
<3>[  517.535526] [drm:valleyview_pipestat_irq_handler [i915]] *ERROR* CPU pipe
B FIFO underrun
<3>[  526.503783] [drm:valleyview_pipestat_irq_handler [i915]] *ERROR* CPU pipe
B FIFO underrun
<3>[  529.793110] [drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR*
pipe B underrun
<3>[  529.793307] [drm:valleyview_pipestat_irq_handler [i915]] *ERROR* CPU pipe
B FIFO underrun

==Reproduce steps==
---------------------------- 
1.  ./kms_render --run-subtest direct-render

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