Check for audio noise and pops

This series is a continuation of "Add igt_audio self-tests and check for noise/pops". Comments have been addressed on the last two patches of that series, and a new commit adds a new phaseshift test.

In my real-world tests the power for these low frequencies go up to 0.0001 for DisplayPort. In the self-tests a 0.0005 threshold detects a phaseshift of at least 4 samples. Lowering the threshold to 0.0002 isn't enough to detect phaseshifts with a lower number of samples. Thus I still think a 0.0005 threshold is reasonable.

The phaseshift self-test truncates 8 samples, just so that we have some freedom if we want to change audio_signal_detect's logic. 8 samples is definitely a very small phaseshift.

Simon Ser (3):
lib/igt_audio: detect noise and pops lib/tests/igt_audio: add a pop test lib/tests/igt_audio: add phaseshift detection test

 lib/igt_audio.c       | 58 ++++++++++++++++++++++++++++++++++++++----
 lib/tests/igt_audio.c | 59 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 112 insertions(+), 5 deletions(-)

--
2.21.0

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