[Bug 103337] [CI] igt at drv_suspend@debugfs-reader - dmesg-warn - *ERROR* Panel is unable to calculate any CRC after 6 vblanks | Unclaimed read from register 0x130090

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103337

--- Comment #3 from Marta Löfstedt <marta.lofstedt at intel.com> ---
https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3306/shard-glkb3/igt@kms_frontbuffer_tracking@fbc-1p-primscrn-pri-indfb-draw-mmap-gtt.html
piglit 
[ 3798.061259] [drm:intel_dp_sink_crc [i915]] *ERROR* Panel is unable to
calculate any CRC after 6 vblanks

>From dmesg it looks like the actual subtest hasn't started yet:
<7>[ 3797.660555] [IGT] kms_frontbuffer_tracking: executing
...
<3>[ 3798.061259] [drm:intel_dp_sink_crc [i915]] *ERROR* Panel is unable to
calculate any CRC after 6 vblanks
<7>[ 3798.078124] [IGT] kms_frontbuffer_tracking: starting subtest
fbc-1p-primscrn-pri-indfb-draw-mmap-gtt

The same thing is going on ealier:
<7>[ 3738.328402] [IGT] kms_frontbuffer_tracking: executing
...
<3>[ 3738.728622] [drm:intel_dp_sink_crc [i915]] *ERROR* Panel is unable to
calculate any CRC after 6 vblanks
...
<7>[ 3738.746617] [IGT] kms_frontbuffer_tracking: starting subtest
fbcpsr-suspend

and here:
<7>[ 3786.839316] [IGT] kms_frontbuffer_tracking: executing
...
<3>[ 3787.250869] [drm:intel_dp_sink_crc [i915]] *ERROR* Panel is unable to
calculate any CRC after 6 vblanks
<7>[ 3787.267657] [IGT] kms_frontbuffer_tracking: starting subtest
fbc-2p-scndscrn-pri-shrfb-draw-render

The we can look in the previous shard on this machine without reboot:
https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3306/shard-glkb3/dmesg28.log
<7>[ 3255.851528] [IGT] kms_frontbuffer_tracking: executing
...
<3>[ 3256.262032] [drm:intel_dp_sink_crc [i915]] *ERROR* Panel is unable to
calculate any CRC after 6 vblanks
...
<7>[ 3256.279360] [IGT] kms_frontbuffer_tracking: starting subtest
psr-1p-primscrn-pri-indfb-draw-pwrite

In the run before that one:
https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3306/shard-glkb3/dmesg25.log
The issue isn't present.

However, in the on after this run, the last shard:
https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3306/shard-glkb3/dmesg34.log

The issue continues:
<7>[ 4388.690460] [IGT] kms_frontbuffer_tracking: executing
...
<3>[ 4389.103319] [drm:intel_dp_sink_crc [i915]] *ERROR* Panel is unable to
calculate any CRC after 6 vblanks
<7>[ 4389.120204] [IGT] kms_frontbuffer_tracking: starting subtest
fbc-2p-scndscrn-pri-shrfb-draw-blt
and
<7>[ 4565.469133] [IGT] kms_frontbuffer_tracking: executing
...
<3>[ 4565.874254] [drm:intel_dp_sink_crc [i915]] *ERROR* Panel is unable to
calculate any CRC after 6 vblanks
<7>[ 4565.891824] [IGT] kms_frontbuffer_tracking: starting subtest
psr-2p-primscrn-spr-indfb-move

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