Re: [PATCH v2] topology: Add topology file for generic HDA DSP machine driver

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+SectionPCMCapabilities."DMIC-Capture" {
+    formats "S16_LE"
+    rates "48000"
+    channels_min "2"
+    channels_max "2"
+    sig_bits "16"
+}

NHLT reports 4 microphones on a number of devices, is there any specific reason to limit the capture to 2ch?

I believe the generic Hdaudio card now reports the number of channels to pulseaudio, so it's possible that PulseAudio would open a 4ch stream but be told sorry no can do by topology.

FWIW we ended-up selecting different topology files in SOF, depending on whether we had 0, 2 or 4 mics.


This patch was prepared to address many issues regarding broken DMIC configurations.

You are right - there are different DMIC configurations on different devices, but, since path multi-configuration feature is not upstreamed in cAVS driver, we are not able to include all of these in one topology file.

This is a reference topology, and it was successfully validated on few production laptops (including models on which DMIC capture was not working).





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