[BUG] SNR value is smaller than acceptable value in TestPtpPlaybackBitDepthConversion

[dkrzysiak]

Describe the bug SNR value is smaller than acceptable value in TestPtpPlaybackBitDepthConversion Issue found in: [ICL] 02_13_TestPtpPlaybackBitDepthConversion8000Hz16b16b2ch

Topology Description: Simultaneous playback and capture on external loopback (same SSP) with signal verification. Playback pipeline is setup that bit depth conversion is done on DAI component (e.g.: if host component is set for bit depth 16/16b, DAI is converting to 24/32b on first topology iteration, and to 32/32b on second).

Topology:
pipe_plb
+-------------------------------+
| +------+   +------+   +-----+ |  +-----+
| | Host |-->|Buffer|-->| Dai |--->| SSP |
| +------+   +------+   +-----+ |  +-----+
+-------------------------------+    | |
                                     | |
pipe_cap                             | |
+-------------------------------+    | |
| +------+   +------+   +-----+ |  +-----+
| | Host |<--|Buffer|<--| Dai |<---| SSP |
| +------+   +------+   +-----+ |  +-----+
+-------------------------------+

To Reproduce Run tests with Diagnostic driver: 02_13_TestPtpPlaybackBitDepthConversion8000Hz16b16b2ch 1/75 With options --playback-iterations=75

Reproduction Rate 1/75

Environment

1. Branch name and commit hash of the 2 repositories: sof (firmware/topology) and linux (kernel driver).
   • SOF BRANCH: main HASH: https://github.com/thesofproject/sof/commit/6c4f3ea42f0d04e9a421dd8325cdbc9be31056bf
2. Name of the platform(s) on which the bug is observed.
   • Platform: ICL
3. Test environment: BRANCH: master HASH: a145313efc604a967d057843d7c27c1aee7add7f

Screenshots or console output

logs.zip