linux-kernel - Re: [RFC PATCH 0/3] Separate BE DAI HW constraints from FE ones

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Message-ID: <20210415172554.GI5514@sirena.org.uk>
Date:   Thu, 15 Apr 2021 18:25:54 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Codrin.Ciubotariu@...rochip.com
Cc:     perex@...ex.cz, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org, gustavoars@...nel.org,
        mirq-linux@...e.qmqm.pl, tiwai@...e.com, lgirdwood@...il.com
Subject: Re: [RFC PATCH 0/3] Separate BE DAI HW constraints from FE ones

On Thu, Apr 15, 2021 at 04:56:00PM +0000, Codrin.Ciubotariu@...rochip.com wrote:

> Are there any plans for refactoring DPCM? any ideas ongoing? I also have 
> some changes for PCM dmaengine, in the same 'style', similar to what I 
> sent some time ago...
> I can adjust to different ideas, if there are any, but, for a start, can 
> anyone confirm that the problem I am trying to fix is real?

Lars-Peter's presentation from ELC in 2016 (!) is probably the clearest
summary of the ideas:

   https://elinux.org/images/e/e7/Audio_on_Linux.pdf
   https://youtu.be/6oQF2TzCYtQ

Essentially the idea is to represent everything, including the DSPs, as
ASoC components and be able to represent the digital links between
components in the DAPM graph in the same way we currently represent
analogue links.  This means we need a way to propagate digital
configuration along the DAPM graph (or a parallel, cross linked digital
one).  Sadly I'm not really aware of anyone actively working on the
actual conversion at the minute, Morimoto-san has done a lot of great
preparatory work to make everything a component which makes the whole
thing more tractable.

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