[Bug 94294] [BAT SNB BSW HSW] basic-flip-vs-wf_vblank timestamp vs. seq counter difference

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94294

--- Comment #2 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
Potentially related; sometimes [1] we get the same off by one seq vs .ts issue,
except with seq_step==1. Not sure if there's some bug in the test or maybe
seq_step doesn't always indicate the length of the wait?

(kms_flip:6763) DEBUG: name = flip
last_ts = 333.745977 usec
last_received_ts = 333.745522 usec
last_seq = 1706
current_ts = 333.929216 usec
current_received_ts = 333.929426 usec
current_seq = 1716
count = 51
seq_step = 1
(kms_flip:6763) CRITICAL: Test assertion failure function check_state,
file kms_flip.c:692:
(kms_flip:6763) CRITICAL: Failed assertion: fabs((((double)
diff.tv_usec) - usec_interflip) / usec_interflip) <= 0.005
(kms_flip:6763) CRITICAL: Last errno: 25, Inappropriate ioctl for device
(kms_flip:6763) CRITICAL: inter-flip ts jitter: 0s, 183239usec
****  END  ****

[1] /archive/results/CI_IGT_test/Patchwork_1530/

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