From: Sebastian Reichel <sre@kernel.org>
To: Tony Lindgren <tony@atomide.com>
Cc: alsa-devel@alsa-project.org, linux-omap@vger.kernel.org,
Aaro Koskinen <aaro.koskinen@iki.fi>,
linux-kernel@vger.kernel.org, Merlijn Wajer <merlijn@wizzup.org>,
Takashi Iwai <tiwai@suse.com>,
Liam Girdwood <lgirdwood@gmail.com>,
Peter Ujfalusi <peter.ujfalusi@ti.com>,
Mark Brown <broonie@kernel.org>, Pavel Machek <pavel@ucw.cz>,
"Arthur D ." <spinal.by@gmail.com>,
Jarkko Nikula <jarkko.nikula@bitmer.com>
Subject: Re: [alsa-devel] [PATCH] ASoC: ti: Allocate dais dynamically for TDM and audio graph card
Date: Fri, 14 Feb 2020 14:04:28 +0100 [thread overview]
Message-ID: <20200214130428.gkhmr55ptmi2bh2x@earth.universe> (raw)
In-Reply-To: <20200214013454.GX64767@atomide.com>
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Hi,
On Thu, Feb 13, 2020 at 05:34:54PM -0800, Tony Lindgren wrote:
> * Sebastian Reichel <sre@kernel.org> [200214 00:35]:
> > On Wed, Feb 12, 2020 at 06:35:43AM -0800, Tony Lindgren wrote:
> > > Yes this should follow the audio-graph-card.txt example. We end up with
> > > mcbsp3 dts node as below on droid4:
> > >
> > > &mcbsp3 {
> > > #sound-dai-cells = <0>;
> > > pinctrl-names = "default";
> > > pinctrl-0 = <&mcbsp3_pins>;
> > > status = "okay";
> > >
> > > ports {
> > > mcbsp3_port: port@0 {
> > > #address-cells = <1>;
> > > #size-cells = <0>;
> > >
> > > cpu_dai3: endpoint@0 {
> >
> > cpu_dai3_cpcap
> >
> > > reg = <0>;
> > > dai-format = "dsp_a";
> > > frame-master = <&cpcap_audio_codec1>;
> > > bitclock-master = <&cpcap_audio_codec1>;
> > > remote-endpoint = <&cpcap_audio_codec1>;
> > > };
> > >
> > > cpu_dai_mdm: endpoint@1 {
> >
> > cpu_dai3_mdm
>
> OK
>
> > > reg = <1>;
> > > dai-format = "dsp_a";
> > > frame-master = <&cpcap_audio_codec1>;
> > > bitclock-master = <&cpcap_audio_codec1>;
> > > remote-endpoint = <&mot_mdm6600_audio_codec0>;
> > > };
> > > };
> > > };
> > > };
> > >
> > > That is pretty much the same as the 'Multi DAI with DPCM' example, with
> > > dne dai, and multiple endpoints. I think we still have just one port
> > > for one i2s transport on the mcbsp :)
> > >
> > > Does the above look as what you would expect based on the binding?
> >
> > I haven't had a look at this for quite some time. I suppose the
> > cpcap voice DAI and the modem will also have two endpoints? So
> > once the BT support is added it will looks like this [simplified]?
>
> Well it will be even simpler, no need for extra endpoints at
> the codecs, see below.
>
> > &mcbsp3 {
> > ports {
> > port@0 {
> > cpu_dai3_cpcap: endpoint@0 {};
> > cpu_dai3_modem: endpoint@1 {};
> > cpu_dai3_bt: endpoint@2 {};
> > };
> > };
> > };
>
> But yes, bluetooth would be just added as above under mcbsp3.
>
[...]
>
> Then the modem codec looks like this:
>
> mot_mdm6600_audio: audio-codec {
> #address-cells = <1>;
> #size-cells = <0>;
> #sound-dai-cells = <1>;
>
> port@0 {
> mot_mdm6600_audio_codec0: endpoint {
> remote-endpoint = <&cpu_dai_mdm>;
> };
> };
> };
>
> > &bluetooth {
> > ports {
> > port@0 {
> > bt_dai_cpu: endpoint@0 {};
> > bt_dai_modem: endpoint@1 {};
> > bt_dai_cpcap: endpoint@2 {};
> > };
> > };
> > };
>
> And bluetooth would be similar to cpcap_audio and mot_mdm6600_audio
> above.
My understanding is, that CPU is not involved for calls (except for
setting up cpcap registers correctly). Basically McBSP3 should
remain idle for a call and data goes directly from modem to cpcap.
The same should work for modem <-> BT, except that CPCAP seems to
always provide the clock. That would imply a direct link between
modem and codec / BT?
> My guess is that only cpcap registers and clock rate needs to be
> changed for bluetooth audio BTW, so if somebody havs a bluetooth
> headset just do the following in Android:
>
> # cpcaprw --all > /tmp/before
> configure bluetooth headset for audio in android and start
> playing some music or make a phone call
> ...
> # cpcaprw --all > /tmp/after
> stop playing music or phone call
> ...
> diff -u /tmp/before /tmp/after
>
> The registers will be different for a bluetooth phone call and
> playing music.
I can provider register values once I find some time.
-- Sebastian
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next prev parent reply other threads:[~2020-02-14 13:05 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-11 17:16 [alsa-devel] [PATCH] ASoC: ti: Allocate dais dynamically for TDM and audio graph card Tony Lindgren
2020-02-12 8:02 ` Peter Ujfalusi
2020-02-12 14:35 ` Tony Lindgren
2020-02-14 0:34 ` Sebastian Reichel
2020-02-14 1:34 ` Tony Lindgren
2020-02-14 13:04 ` Sebastian Reichel [this message]
2020-02-14 17:09 ` Tony Lindgren
2020-02-18 14:04 ` Sebastian Reichel
2020-02-18 14:19 ` Tony Lindgren
2020-02-18 16:35 ` Sebastian Reichel
2020-02-14 12:41 ` [alsa-devel] " Peter Ujfalusi
2020-02-14 12:49 ` Mark Brown
2020-02-14 17:05 ` Tony Lindgren
2020-02-14 20:05 ` Mark Brown
2020-02-14 17:03 ` Tony Lindgren
2020-02-17 1:38 ` Kuninori Morimoto
2020-02-17 5:25 ` Kuninori Morimoto
2020-02-17 12:09 ` Peter Ujfalusi
2020-02-17 23:10 ` Tony Lindgren
2020-02-17 23:36 ` Tony Lindgren
2020-02-18 15:26 ` Peter Ujfalusi
2020-02-18 15:34 ` Tony Lindgren
2020-02-18 12:43 ` Peter Ujfalusi
2020-02-18 15:28 ` Tony Lindgren
2020-02-20 14:07 ` Peter Ujfalusi
2020-02-20 20:13 ` Tony Lindgren
2020-02-21 14:07 ` Peter Ujfalusi
2020-02-18 21:16 ` Sebastian Reichel
2020-02-20 14:15 ` Peter Ujfalusi
2020-02-20 20:15 ` Tony Lindgren
2020-02-21 13:20 ` Peter Ujfalusi
2020-02-21 18:08 ` Tony Lindgren
2020-02-20 20:47 ` Sebastian Reichel
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