[Bug 88977] [BSW]igt/kms_cursor_crc/cursor-size-change sporadically causes *ERROR* CPU pipe B FIFO underrun

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88977

--- Comment #9 from ye.tian <yex.tian at intel.com> ---
Teset it on the latest nightly kernel and latest igt, It still exists.

output:
--------------------
root at x-bsw08:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# ./kms_cursor_crc
--run-subtest cursor-size-change
IGT-Version: 1.10-ge1ce5ea (x86_64) (Linux:
4.0.0_drm-intel-nightly_b9fe35_20150421+ x86_64)
Beginning cursor-size-change on pipe A, connector eDP-1
Test assertion failure function igt_assert_crc_equal, file igt_debugfs.c:207:
Failed assertion: a->crc[i] == b->crc[i]
error: 0x2cae1c != 0x63f27f
Stack trace:
  #0 [__igt_fail_assert+0xf1]
  #1 [igt_assert_crc_equal+0x78]
  #2 [test_cursor_size+0x1b1]
  #3 [run_test.constprop.3+0x212]
  #4 [__real_main556+0x1a0]
  #5 [main+0x21]
  #6 [__libc_start_main+0xf5]
  #7 [_start+0x29]
  #8 [<unknown>+0x29]
Subtest cursor-size-change failed.
**** DEBUG ****
Test requirement passed: cursor_w <= data->cursor_max_w && cursor_h <=
data->cursor_max_h
display: eDP-1: set_pipe(A)
display: A.3: plane_set_fb(0)
display: commit {
display:     eDP-1: Selecting pipe A
display:     eDP-1: SetCursor pipe A, disabling
display: }
igt_create_fb_with_bo_size(width=1920, height=1080, format=0x34325258 [bpp=32],
tiling=0x0, size=0
igt_create_fb_with_bo_size(handle=1, pitch=7680)
display: A.0: plane_set_fb(51)
display: commit {
display:     eDP-1: Selecting pipe A
display:     eDP-1: SetCrtc pipe A, fb 51, panning (0, 0), mode 1920x1080
display: }
display: A.3: plane_set_fb(0)
Beginning cursor-size-change on pipe A, connector eDP-1
igt_create_fb_with_bo_size(width=256, height=256, format=0x34325241 [bpp=32],
tiling=0x0, size=0
igt_create_fb_with_bo_size(handle=2, pitch=1024)
display: A.3: plane_set_fb(53)
display: A.3: plane_set_size (256x256)
display: A.3: plane_set_fb(0)
display: commit {
display:     eDP-1: Selecting pipe A
display:     eDP-1: SetCursor pipe A, disabling
display: }
Test assertion failure function igt_assert_crc_equal, file igt_debugfs.c:207:
Failed assertion: a->crc[i] == b->crc[i]
error: 0x2cae1c != 0x63f27f
****  END  ****
Subtest cursor-size-change: FAIL (1.866s)

root at x-bsw08:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# dmesg  -r | grep
ERROR
<3>[  479.146745] [drm:valleyview_pipestat_irq_handler [i915]] *ERROR* CPU pipe
A FIFO underrun

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