On 4/16/21 11:31 AM, Mark Brown wrote:
On Fri, Apr 16, 2021 at 04:03:05PM +0000, Codrin.Ciubotariu@xxxxxxxxxxxxx wrote:
Thank you for the links! So basically the machine driver disappears and
all the components will be visible in user-space.
Not entirely - you still need something to say how they're wired
together but it'll be a *lot* simpler for anything that currently used
DPCM.
If there is a list with the 'steps' or tasks to achieve this? I can try
to pitch in.
Not really written down that I can think of. I think the next steps
that I can think of right now are unfortunately bigger and harder ones,
mainly working out a way to represent digital configuration as a graph
that can be attached to/run in parallel with DAPM other people might
have some better ideas though. Sorry, I appreciate that this isn't
super helpful :/
I see a need for this in our future SoundWire/SDCA work. So far I was
planning to model the entities as 'widgets' and lets DAPM propagate
activation information for power management, however there are also bits
of information in 'Clusters' (number of channels and spatial
relationships) that could change dynamically and would be interesting to
propagate across entities, so that when we get a stream of data on the
bus we know what it is.
when we discussed the multi-configuration support for BT offload, it
also became apparent that we don't fully control the sample rate changes
between FE and BE, we only control the start and ends. I fully agree
that the division between front- and back-ends is becoming limiting and
DPCM is not only complicated but difficult to stretch further.
