[Bug 82602] New: [SNB Regression]igt/kms_cursor_crc/cursor-256-sliding causes "[drm:display_pipe_crc_irq_handler] *ERROR* spurious interrupt"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=82602

          Priority: high
            Bug ID: 82602
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [SNB Regression]igt/kms_cursor_crc/cursor-256-sliding
                    causes "[drm:display_pipe_crc_irq_handler] *ERROR*
                    spurious interrupt"
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: jinxianx.guo at intel.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 104607
  --> https://bugs.freedesktop.org/attachment.cgi?id=104607&action=edit
dmesg

==System Environment==
--------------------------
Regression: Yes.
Only failed on -nihgtly branch. good commit on
-nihgtly(79e44bfa10063ee529140e88fdc401c4ce07d644)

Non-working platforms: SNB

==kernel==
--------------------------
origin/drm-intel-nightly: da31e7c60be217316278a055dd3f91c33913270f(fails)
    drm-intel-nightly: 2014y-08m-13d-17h-12m-37s integration manifest
origin/drm-intel-next-queued: 82e3b8c130f046b7dd1e7898c10e40edb52fee6d(works)
    drm/i915: Localise the fbdev console lock frobbing  
origin/drm-intel-fixes: 7613ec9e6b40b1651d0b8d4af85517ae81110900(works)
    drm/i915: Skip load detect when intel_crtc->new_enable==true
origin/drm-fixes: 1b2c4869d8247f9e202fa8a73777c34adc62d409(works)
    drm/radeon: fix cut and paste issue for hawaii.
origin/drm-intel-fixes: 7963e9db1b1f842fdc53309baa8714d38e9f5681(works)
    Revert "drm: drop redundant drm_file->is_master"

==Bug detailed description==
-----------------------------
igt/kms_cursor_crc/cursor-256-sliding causes
"[drm:display_pipe_crc_irq_handler] *ERROR* spurious interrupt"

Output:
[root at x-sgb4 tests]# ./kms_cursor_crc --run-subtest cursor-256-sliding
IGT-Version: 1.7-g5c7bcb1 (i686) (Linux:
3.16.0_drm-intel-nightly_da31e7_20140814+ i686)
Beginning cursor-256-sliding on pipe A, connector VGA-1
................................................
cursor-256-sliding on pipe A, connector VGA-1: PASSED

Beginning cursor-256-sliding on pipe B, connector VGA-1
................................................
cursor-256-sliding on pipe B, connector VGA-1: PASSED

Beginning cursor-256-sliding on pipe A, connector DP-1
................................................
cursor-256-sliding on pipe A, connector DP-1: PASSED

Beginning cursor-256-sliding on pipe B, connector DP-1
..........Test assertion failure function do_single_test, file
kms_cursor_crc.c:123:
Failed assertion: igt_crc_equal(&crc, &ref_crc)
Subtest cursor-256-sliding: FAIL
[root at x-sgb4 tests]# dmesg -r|egrep ""<[1-4]>""|grep drm
<3>[    0.000000] [drm:display_pipe_crc_irq_handler] *ERROR* spurious interrupt
<3>[    0.000000] [drm:display_pipe_crc_irq_handler] *ERROR* spurious interrupt
<3>[    0.000000] [drm:display_pipe_crc_irq_handler] *ERROR* spurious interrupt
<3>[    0.000000] [drm:display_pipe_crc_irq_handler] *ERROR* spurious interrupt
<3>[    0.000000] [drm:display_pipe_crc_irq_handler] *ERROR* spurious interrupt
<3>[    0.000000] [drm:display_pipe_crc_irq_handler] *ERROR* spurious interrupt
<3>[    0.000000] [drm:display_pipe_crc_irq_handler] *ERROR* spurious interrupt
<3>[    0.000000] [drm:display_pipe_crc_irq_handler] *ERROR* spurious interrupt
<3>[    0.000000] [drm:display_pipe_crc_irq_handler] *ERROR* spurious interrupt
<3>[    0.000000] [drm:display_pipe_crc_irq_handler] *ERROR* spurious interrupt


Reproduce steps:
-------------------------
1. ./kms_cursor_crc --run-subtest cursor-256-sliding

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