Alsa-Devel Archive on lore.kernel.org
 help / color / Atom feed
From: Peter Ujfalusi <peter.ujfalusi@ti.com>
To: Tony Lindgren <tony@atomide.com>,
	Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Cc: alsa-devel@alsa-project.org, linux-omap@vger.kernel.org,
	Liam Girdwood <lgirdwood@gmail.com>,
	Merlijn Wajer <merlijn@wizzup.org>,
	Aaro Koskinen <aaro.koskinen@iki.fi>,
	linux-kernel@vger.kernel.org, Takashi Iwai <tiwai@suse.com>,
	Mark Brown <broonie@kernel.org>, Pavel Machek <pavel@ucw.cz>,
	Sebastian Reichel <sre@kernel.org>,
	"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 14:41:30 +0200
Message-ID: <346dfd2b-23f8-87e0-6f45-27a5099b1066@ti.com> (raw)
In-Reply-To: <20200212143543.GI64767@atomide.com>

Hi Tony,

On 12/02/2020 16.35, Tony Lindgren wrote:
> * Peter Ujfalusi <peter.ujfalusi@ti.com> [200212 08:02]:
>>
>>
>> On 11/02/2020 19.16, Tony Lindgren wrote:
>>> We can have multiple connections on a single McBSP instance configured
>>> with audio graph card when using TDM (Time Division Multiplexing). Let's
>>> allow that by configuring dais dynamically.
>>
>> It is still one DAI...
>> If you have multiple codec connected to the same I2S lines, but the
>> codecs communicate within different time slots, you still have one DAI
>> on the CPU side, but multiple codecs (codec DAIs) with different TDM slot.
> 
> OK so subject should say "dodec DAIs" then I guess?
> 
>>> See Documentation/devicetree/bindings/sound/audio-graph-card.txt and
>>> Documentation/devicetree/bindings/graph.txt for more details for
>>> multiple endpoints.
>>
>> See the example for 'Multi DAI with DPCM' in audio-graph-card.txt
>> The PCM3168a have 2 DAIs: playback and capture, but you can have
>> multiple endpoints within a DAI.
> 
> 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 {
>                                 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 {
>                                 reg = <1>;
>                                 dai-format = "dsp_a";
>                                 frame-master = <&cpcap_audio_codec1>;
>                                 bitclock-master = <&cpcap_audio_codec1>;
>                                 remote-endpoint = <&mot_mdm6600_audio_codec0>;
>                         };
>                 };
>         };
> };

According to
Documentation/devicetree/bindings/sound/audio-graph-card.txt
it should be something like this:
&mcbsp3 {
        #sound-dai-cells = <0>;
        pinctrl-names = "default";
        pinctrl-0 = <&mcbsp3_pins>;
        status = "okay";

        ports {
		#address-cells = <1>;
		#size-cells = <0>;
                port@0 {
			reg = <0>;

			cpu_dai3: endpoint@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 {
				dai-format = "dsp_a";
				frame-master = <&cpcap_audio_codec1>;
				bitclock-master = <&cpcap_audio_codec1>;
				remote-endpoint = <&mot_mdm6600_audio_codec0>;
			};
		};
	};
};

If you span out dummy DAIs got dai1+ then how you will get anything
working via endpoint1+?
There will be no ops for McBSP, so it is not going to do anything...


> 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?

The audio-graph-card.txt example shows pcm3168a which have two DAIs,
one for playback and one for capture.

I guess Morimoto-san can explain if he carries out of tree patches to
get the described setup working on top of mainline...

But, no, based on the documentation I don't ;)

>>> I've tested this with droid4 where cpcap pmic and modem voice are both
>>> both wired to mcbsp3. I've also tested this on droid4 both with and
>>> without the pending modem audio codec driver that is waiting for n_gsm
>>> serdev dependencies to clear.
>>
>> What this patch you effectively just creating dummy-dais on top of the
>> real McBSP DAI.
> 
> Yes I think this is needed for snd-soc-audio-graph-card, and this allows
> configuring whatever is needed for the i2s slot. But maybe you have some
> better way of doing it in mind?
> 
>> You also rename the DAIs, which might break ams-delta.
> 
> Oops, that's not good. So should we just keep the old naming if there's
> only one endpoint?

That's an option, yes, if we really need extra dummy McBSP DAIs at all,
again, let's hear from Morimoto-san or Mark.
 
>> We still have legacy support in
>> omap-twl4030.c
>> omap3pandora.c
>> osk5912.c
>> rx51.c
>>
>> which will break with the renamed DAI. On the other hand I think the
>> legacy support can be dropped from them.
> 
> I'm not sure what all that would take.

For some it should not be a big deal as they only boot in DT mode.
/me adds this to the TODO list.
 
>> I know it was discussed, but can not find the mail:
>> Can you brief again on the audio connection?
> 
> Below is a link to a mailing list thread where Sebastian describes
> the audio connection:
> 
> https://lkml.org/lkml/2018/3/28/881

Thanks!
 
>> Do you have branch with working code?
> 
> Yeah I have slightly older set of the patches in my droid4-pending-v5.5
> kernel.org git branch with voice calls working.

I think I should put my droid4 out and try to get it working...
Do you have a link for dummies to follow to get started? ;)

> 
> Regards,
> 
> Tony
> 

- Péter

Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki. Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki
_______________________________________________
Alsa-devel mailing list
Alsa-devel@alsa-project.org
https://mailman.alsa-project.org/mailman/listinfo/alsa-devel

  parent reply index

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-11 17:16 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
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     ` Peter Ujfalusi [this message]
2020-02-14 12:49       ` [alsa-devel] " 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

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=346dfd2b-23f8-87e0-6f45-27a5099b1066@ti.com \
    --to=peter.ujfalusi@ti.com \
    --cc=aaro.koskinen@iki.fi \
    --cc=alsa-devel@alsa-project.org \
    --cc=broonie@kernel.org \
    --cc=jarkko.nikula@bitmer.com \
    --cc=kuninori.morimoto.gx@renesas.com \
    --cc=lgirdwood@gmail.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-omap@vger.kernel.org \
    --cc=merlijn@wizzup.org \
    --cc=pavel@ucw.cz \
    --cc=spinal.by@gmail.com \
    --cc=sre@kernel.org \
    --cc=tiwai@suse.com \
    --cc=tony@atomide.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Alsa-Devel Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/alsa-devel/0 alsa-devel/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 alsa-devel alsa-devel/ https://lore.kernel.org/alsa-devel \
		alsa-devel@alsa-project.org
	public-inbox-index alsa-devel

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.alsa-project.alsa-devel


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git