On 3/17/2021 4:16 PM, Srinivas Kandagatla wrote:
Hi All,
Am trying to load a FrontEnd/pcm dai definition from ASoC topology
however I hit a catch 22 situation here. Topology is loaded as part of
component probe() but component probe is only called as part of
sound-card bind().
Any pointers on how is this supposed to work?
Thanks,
srini
Hi,
I would say I partially described how it works, when writing topology
kunit tests, here is link to cover letter:
https://lore.kernel.org/alsa-devel/20210120152846.1703655-1-amadeuszx.slawinski@xxxxxxxxxxxxxxx/
To sum it up, there is no predefined order in which component and card
should be created. After each one of them is created ASoC tries to
rebind everything together and it should call component probe if
everything connects correctly.
I'm not sure what problem you are seeing, but if you look at topology
test cases I only define BE in it, no FEs. So I guess you can look at it.
You can also look at skylake (sound/soc/intel/skylake) or SOF
(sound/soc/sof/) driver code which are real use cases of topology.
skylake and SOF code have pcm part which creates component and registers
probe function responsible for loading topology. Separate part are
machine drivers which create card (sound/soc/intel/boards).
