On 3/11/20 4:13 AM, Gorski, Mateusz wrote:
+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).
Sorry, I don't understand what's missing in the cAVS driver?
All you need is to select a different topology based on the number of DMICs detected.