[Bug 84890] New: [BYT]igt/drv_debugfs_reader sporadically causes *ERROR* Panel is unable to calculate CRC after 6 vblanks

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84890

            Bug ID: 84890
           Summary: [BYT]igt/drv_debugfs_reader sporadically causes
                    *ERROR* Panel is unable to calculate CRC after 6
                    vblanks
           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,
                    jinxianx.guo at intel.com

Created attachment 107689
  --> https://bugs.freedesktop.org/attachment.cgi?id=107689&action=edit
dmesg

==System Environment==
--------------------------
Regression: not sure, unstable

Non-working platforms: BYT

==kernel==
--------------------------
drm-intel-nightly/ea4bec8e96ea8b33b49a7892c1c7f20041a56da6

==Bug detailed description==
-----------------------------
It sporadically causes "*ERROR* Panel is unable to calculate CRC after 6
vblanks" when run automation testing.Fail rate: 1/5. Clean boot system then run
binary 5 cycles, it works well. 

Run case list:
Intel_gpu_tools/igt_core_getclient    PASS
Intel_gpu_tools/igt_core_get_client_auth_master-drop    PASS
Intel_gpu_tools/igt_core_get_client_auth_simple    PASS
Intel_gpu_tools/igt_core_getstats    PASS
Intel_gpu_tools/igt_core_getversion    PASS
Intel_gpu_tools/igt_debugfs_emon_crash    PASS
Intel_gpu_tools/igt_drm_import_export_flink    PASS
Intel_gpu_tools/igt_drm_import_export_prime    PASS
Intel_gpu_tools/igt_drm_vma_limiter    PASS
Intel_gpu_tools/igt_drm_vma_limiter_cached    PASS
Intel_gpu_tools/igt_drm_vma_limiter_cpu    PASS
Intel_gpu_tools/igt_drm_vma_limiter_gtt    PASS
Intel_gpu_tools/igt_drv_debugfs_reader    DMESG_WARN      reboot


run log:
Test Environment check: Succeeded.
[1/1] dmesg-warn: 1 Running Test(s): 0
[1/1] dmesg-warn: 1 Running Test(s): 1
Thank you for running Piglit!
Results have been written to /GFX/Test/Piglit/piglit/t
{
    "results_version": 1,
    "time_elapsed": 0.7119438648223877,
    "tests": {
        "igt/drv_debugfs_reader": {
            "dmesg": "[ 1575.354677] [drm:intel_dp_sink_crc] *ERROR* Panel is
unable to calculate CRC after 6 vblanks",
            "returncode": 0,
            "err": "",
            "environment": "PIGLIT_SOURCE_DIR=\"/GFX/Test/Piglit/piglit\"
PIGLIT_PLATFORM=\"mixed_glx_egl\"",
            "command":
"/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests/drv_debugfs_reader",
            "result": "dmesg-warn",
            "time": 0.5496139526367188,
            "out": ""
        }
    },
    "name": "t",
    "options": {
        "profile": [
            "tests/igt.py"
        ],
        "dmesg": false,
        "execute": true,
        "platform": "mixed_glx_egl",
        "valgrind": false,
        "sync": false,
        "filter": [
            "igt/drv_debugfs_reader$"
        ],
        "concurrent": "some",
        "exclude_tests": [],
        "env": {


==Reproduce steps==
---------------------------- 
1. run above case list 5 cycles.

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