[Bug 85894] New: [BSW]kms_cursor_crc is sporadical timeout

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85894

            Bug ID: 85894
           Summary: [BSW]kms_cursor_crc is sporadical timeout
           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 108927
  --> https://bugs.freedesktop.org/attachment.cgi?id=108927&action=edit
dmesg

==System Environment==
--------------------------
Regression: not sure 
Non-working platforms: BDW

==kernel==
--------------------------
drm-intel-nightly/782bafb46cc12737b16e5007583bd7b534c6202a

==Bug detailed description==
It's sporadical timeout and fail(bug 84269 track fail). 
Run 4 cycles, it fails on the 1st cycle, the rest of 3 cycles are timeout.

Case list:
igt/kms_cursor_crc/cursor-128x128-offscreen
igt/kms_cursor_crc/cursor-128x128-onscreen
igt/kms_cursor_crc/cursor-128x128-random
igt/kms_cursor_crc/cursor-128x128-sliding
igt/kms_cursor_crc/cursor-256x256-offscreen
igt/kms_cursor_crc/cursor-256x256-onscreen
igt/kms_cursor_crc/cursor-256x256-random
igt/kms_cursor_crc/cursor-256x256-sliding
igt/kms_cursor_crc/cursor-64x64-offscreen
igt/kms_cursor_crc/cursor-64x64-onscreen
igt/kms_cursor_crc/cursor-64x64-random
igt/kms_cursor_crc/cursor-64x64-sliding

[root at x-bsw01 tests]# ./kms_cursor_crc --run-subtest cursor-256x256-offscreen
IGT-Version: 1.8-ge622850 (x86_64) (Linux:
3.18.0-rc3_drm-intel-nightly_f56717_20141105+ x86_64)
Beginning cursor-256x256-offscreen on pipe A, connector eDP-1
.Test assertion failure function do_single_test, file kms_cursor_crc.c:131:
Failed assertion: igt_crc_equal(&crc, &ref_crc)
Subtest cursor-256x256-offscreen: FAIL (3.508s)
[root at x-bsw01 tests]# ./kms_cursor_crc --run-subtest cursor-256x256-offscreen
IGT-Version: 1.8-ge622850 (x86_64) (Linux:
3.18.0-rc3_drm-intel-nightly_f56717_20141105+ x86_64)
Subtest cursor-256x256-offscreen: TIMEOUT (7.322s)
[root at x-bsw01 tests]# ./kms_cursor_crc --run-subtest cursor-256x256-offscreen
IGT-Version: 1.8-ge622850 (x86_64) (Linux:
3.18.0-rc3_drm-intel-nightly_f56717_20141105+ x86_64)
Subtest cursor-256x256-offscreen: TIMEOUT (7.311s)
You have new mail in /var/spool/mail/root
[root at x-bsw01 tests]# ./kms_cursor_crc --run-subtest cursor-256x256-offscreen
IGT-Version: 1.8-ge622850 (x86_64) (Linux:
3.18.0-rc3_drm-intel-nightly_f56717_20141105+ x86_64)
Subtest cursor-256x256-offscreen: TIMEOUT (7.318s)

==Reproduce steps==
---------------------------- 
1. ./kms_cursor_crc --run-subtest cursor-256x256-offscreen

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