[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

lu hua <huax.lu at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |NEW
            Summary|[BSW]igt/gem_evict_everythi |[BSW]igt/kms_cursor_crc/cur
                   |ng sporadically causes      |sor-size-change
                   |*ERROR* CPU pipe B FIFO     |sporadically causes *ERROR*
                   |underrun                    |CPU pipe B FIFO underrun

--- Comment #7 from lu hua <huax.lu at intel.com> ---
I reproduce this error when run case kms_cursor_crc/cursor-size-change. I am
unable to reproduce error when run following case manually.
gem_evict_everything
gem_partial_pwrite_pread_reads-display
gem_seqno_wrap
gem_userptr_blits_forked-sync-swapping-multifd-mempressure-interruptible
kms_render_gpu-blit

output:
IGT-Version: 1.9-gbef692d (x86_64) (Linux:
3.19.0-rc7_drm-intel-nightly_75ce8a_20150206+ x86_64)
Beginning cursor-size-change on pipe A, connector eDP-1
(kms_cursor_crc:4335) CRITICAL: Test assertion failure function
test_cursor_size, file kms_cursor_crc.c:426:
(kms_cursor_crc:4335) CRITICAL: Failed assertion: igt_crc_equal(&crc[i],
&ref_crc)
Subtest cursor-size-change: FAIL (1.672s)
IGT-Version: 1.9-gbef692d (x86_64) (Linux:
3.19.0-rc7_drm-intel-nightly_75ce8a_20150206+ x86_64)
Beginning cursor-size-change on pipe A, connector eDP-1
(kms_cursor_crc:4336) CRITICAL: Test assertion failure function
test_cursor_size, file kms_cursor_crc.c:426:
(kms_cursor_crc:4336) CRITICAL: Failed assertion: igt_crc_equal(&crc[i],
&ref_crc)
Subtest cursor-size-change: FAIL (1.645s)
IGT-Version: 1.9-gbef692d (x86_64) (Linux:
3.19.0-rc7_drm-intel-nightly_75ce8a_20150206+ x86_64)
Beginning cursor-size-change on pipe A, connector eDP-1
(kms_cursor_crc:4337) CRITICAL: Test assertion failure function
test_cursor_size, file kms_cursor_crc.c:426:
(kms_cursor_crc:4337) CRITICAL: Failed assertion: igt_crc_equal(&crc[i],
&ref_crc)
Subtest cursor-size-change: FAIL (1.691s)
IGT-Version: 1.9-gbef692d (x86_64) (Linux:
3.19.0-rc7_drm-intel-nightly_75ce8a_20150206+ x86_64)
Beginning cursor-size-change on pipe A, connector eDP-1
(kms_cursor_crc:4338) CRITICAL: Test assertion failure function
test_cursor_size, file kms_cursor_crc.c:426:
(kms_cursor_crc:4338) CRITICAL: Failed assertion: igt_crc_equal(&crc[i],
&ref_crc)
Subtest cursor-size-change: FAIL (1.668s)
IGT-Version: 1.9-gbef692d (x86_64) (Linux:
3.19.0-rc7_drm-intel-nightly_75ce8a_20150206+ x86_64)
Beginning cursor-size-change on pipe A, connector eDP-1
(kms_cursor_crc:4339) CRITICAL: Test assertion failure function
test_cursor_size, file kms_cursor_crc.c:426:
(kms_cursor_crc:4339) CRITICAL: Failed assertion: igt_crc_equal(&crc[i],
&ref_crc)
Subtest cursor-size-change: FAIL (1.636s)

# dmesg -r|egrep "<[1-4]>"|grep drm
<3>[  101.338288] [drm:valleyview_pipestat_irq_handler [i915]] *ERROR* CPU pipe
A FIFO underrun

Disable "dynamic memory self refresh"in BIOS,then run
kms_cursor_crc/cursor-size-change 10 cycles. I don't meet this error.

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