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.
