linux-kernel - Re: [PATCH] ASoC: ti: Allocate dais dynamically for TDM and audio graph card

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Message-ID: <20200221180821.GA37466@atomide.com>
Date:   Fri, 21 Feb 2020 10:08:21 -0800
From:   Tony Lindgren <tony@...mide.com>
To:     Peter Ujfalusi <peter.ujfalusi@...com>
Cc:     Sebastian Reichel <sre@...nel.org>,
        Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
        Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
        Aaro Koskinen <aaro.koskinen@....fi>,
        "Arthur D ." <spinal.by@...il.com>,
        Jarkko Nikula <jarkko.nikula@...mer.com>,
        Merlijn Wajer <merlijn@...zup.org>, Pavel Machek <pavel@....cz>
Subject: Re: [PATCH] ASoC: ti: Allocate dais dynamically for TDM and audio
 graph card

* Peter Ujfalusi <peter.ujfalusi@...com> [200221 13:21]:
> Hi Tony,
> 
> On 20/02/2020 22.15, Tony Lindgren wrote:
> > * Peter Ujfalusi <peter.ujfalusi@...com> [200220 14:16]:
> >> On 18/02/2020 23.16, Sebastian Reichel wrote:
> >>> I suppose in the end its a question if generic card can provide TDM
> >>> support.
> >>
> >> Sure it can, but can it handle the switching between the paths based on
> >> use cases?
> >> There should be machine level DAPM widgets to kick codec2codec (MDM6600
> >> - CPAC_voice for example) and also to make sure that when you switch
> >> between them the system is not going to get misconfigured.
> >> Switching between CPAC and BT route during call?
> >> Not allowing VoIP while on call, etc.
> > 
> > Well I guess the key thing to check here is if it's enough to
> > keep track of things in the cpcap codec driver. If cpcap is always
> > involved, that should be sufficient.
> 
> The codec driver should keep track on what it can do, but should not
> start policing the outside world.
> The machine driver knows the connections and should tell the components
> on what to do.

OK that makes senes to me. So I guess now the question is if
we can maintain this state in snd-soc-audio-graph-card instead
of needing a custom machine driver.

Regards,

Tony