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

[Pierre-Louis Bossart]

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.