topology2: sof-hda-generic: support BT offload pipelines

[brentlu]

Add pipelines for BT offload on SSP2. The topology file name will be sof-hda-generic-2ch-bt-ssp2.tplg or sof-hda-generic-4ch-bt-ssp2.tplg according to DMIC PCM channel number.

cc:

• [STABLE-v2.2] topology1: sof-hda-generic: support BT offload pipelines #9336 (stable-v2.2)

[brentlu]

Linux PR to support this topology: thesofproject/linux#5123

[brentlu]

It seems to me that there are three types of HDA topologies:

sof-hda-generic: platforms before cavs2.5
sof-hda-generic-cavs25: cavs2.5 platforms (TGL, ADL)
sof-hda-generic-ace1: ace1 and ace2 (MTL, LNL)

Should I apply my changes to sof-hda-generic-ace1 and leave other two topologies untouched?

[plbossart]

It seems to me that there are three types of HDA topologies:

sof-hda-generic: platforms before cavs2.5 sof-hda-generic-cavs25: cavs2.5 platforms (TGL, ADL) sof-hda-generic-ace1: ace1 and ace2 (MTL, LNL)

Should I apply my changes to sof-hda-generic-ace1 and leave other two topologies untouched?

IIRC the changes are only related to the DMIC blobs. @ujfalusi can you confirm?

But there's the same objection that for topology1, MTL is a done deal, we can't distribute a new topology that requires an update to the kernel machine driver and topology selection in the SOF driver.

The dependency between machine driver and topology make this sort of change very complicated.

And then there's the question of where do we stop? Why not add BT Offload for SoundWire devices then? It's a nightmare really to add such capabilities on platforms that shipped already without breaking anything.