[BUG] Headset capture does not work with S16_LE format on IPC4-SDW platforms #7240
Description
Describe the bug
I was trying to enable alsabat test for headset capture on MTL platforms, I found that if I test capture with s16_le on MTL-SDW, the max peak always 99%-100%. The recorded wav is full of noise. But with same amixer settings, S32_LE works well. it can record the real data without noise. This issue should be a regression, but not sure how long it has existed.
Console output
arecord -Dhw:0,1 -f s16_le -r 48000 -c 2 test.wav -vvv -d 5
Recording WAVE 'test.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo
Hardware PCM card 0 'sof-soundwire' device 1 subdevice 0
Its setup is:
stream : CAPTURE
access : RW_INTERLEAVED
format : S16_LE
subformat : STD
channels : 2
rate : 48000
exact rate : 48000 (48000/1)
msbits : 16
buffer_size : 16384
period_size : 4096
period_time : 85333
tstamp_mode : NONE
tstamp_type : MONOTONIC
period_step : 1
avail_min : 4096
period_event : 0
start_threshold : 1
stop_threshold : 16384
silence_threshold: 0
silence_size : 0
boundary : 4611686018427387904
appl_ptr : 0
hw_ptr : 0
Max peak (8192 samples): 0x00007ff6 #################### 99%
Max peak (8192 samples): 0x00007ffc #################### 99%
Max peak (8192 samples): 0x00007ffe #################### 99%
Max peak (8192 samples): 0x00008000 #################### 100%
Max peak (8192 samples): 0x00007ffc #################### 99%
Max peak (8192 samples): 0x00007ffe #################### 99%
Max peak (8192 samples): 0x00007ffe #################### 99%
Max peak (8192 samples): 0x00007ff0 #################### 99%
Max peak (8192 samples): 0x00007ff2 #################### 99%
Max peak (8192 samples): 0x00008000 #################### 100%
Max peak (8192 samples): 0x00007ff8 #################### 99%
Max peak (8192 samples): 0x00007ff8 #################### 99%
Max peak (8192 samples): 0x00008000 #################### 100%
Max peak (8192 samples): 0x00008000 #################### 100%
....
To Reproduce
arecord -Dhw:0,1 -f s16_le -r 48000 -c 2 test.wav -vvv -d 5
Reproduction Rate
100%
Expected behavior
A clear and concise description of what you expected to happen.
Impact
What impact does this issue have on your progress (e.g., annoyance, showstopper)
Environment
- Branch name and commit hash of the 2 repositories: sof (firmware/topology) and linux (kernel driver).
- Kernel: {tip sof-dev}
- SOF: {tip main}
- Name of the topology file
- Topology: {sof-mtl-rt711-4ch.tplg}
- Name of the platform(s) on which the bug is observed.
- Platform: {MTL-RVP-SDW}