From: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
To: Charles Keepax <ckeepax@opensource.cirrus.com>,
Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Cc: devicetree@vger.kernel.org, alsa-devel@alsa-project.org,
bgoswami@codeaurora.org, linux-kernel@vger.kernel.org,
plai@codeaurora.org, robh+dt@kernel.org, lgirdwood@gmail.com,
Vinod Koul <vkoul@kernel.org>, Mark Brown <broonie@kernel.org>,
spapothi@codeaurora.org
Subject: Re: [alsa-devel] [PATCH v2 3/5] ASoC: core: add support to snd_soc_dai_get_sdw_stream()
Date: Thu, 10 Oct 2019 09:01:42 -0500 [thread overview]
Message-ID: <22eff3aa-dfd6-1ee5-8f22-2af492286053@linux.intel.com> (raw)
In-Reply-To: <20191010120337.GB31391@ediswmail.ad.cirrus.com>
>>> It's been a while since this thread started, and I still don't
>>> quite get the concepts or logic.
>>>
>>> First, I don't understand what the problem with "aux" devices is.
>>> All the SoundWire stuff is based on the concept of DAI, so I guess
>>> I am
>>
>> That is the actual problem! Some aux devices does not have dais.
>>
>
> Usually aux devices are used for things like analog amplifiers that
> clearly don't have a digital interface, thus it really makes no sense
> to have a DAI link connecting them. So I guess my question here
> would be what is the thinking on making the "smart amplifier" dailess?
> It feels like having a CODEC to CODEC DAI between the CODEC and
> the AMP would be a more obvious way to connect the two devices
> and would presumably avoid the issues being discussed around the
> patch.
Ah, now I get it, I missed the point about not having DAIs for the
amplifier.
I will second Charles' point, the code you have in the machine driver at
[1] gets a SoundWire stream context from the SLIMbus codec dai. It's a
bit odd to mix layers this way.
And if I look at the code below, taken from [1], if you have more than
one codec, then your code looks problematic: data->sruntime would be
overriden and you'd use the info from the last codec dai on the dailink...
case SLIMBUS_0_RX...SLIMBUS_6_TX:
for (i = 0 ; i < dai_link->num_codecs; i++) {
[snip]
data->sruntime[cpu_dai->id] =
snd_soc_dai_get_sdw_stream(rtd->codec_dais[i], 0); << same destination
for multiple codec_dais...
If you keep the amp dai-less, then the stream concept should be somehow
allocated on the master (or machine) side and passed to the codec dais
that are associated to the same 'stream'.
[1]
https://git.linaro.org/people/srinivas.kandagatla/linux.git/tree/sound/soc/qcom/db845c.c?h=release/db845c/qcomlt-5.2
next prev parent reply other threads:[~2019-10-10 14:01 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-13 8:35 [PATCH v2 0/5] soundwire: Add support to Qualcomm SoundWire master Srinivas Kandagatla
2019-08-13 8:35 ` [PATCH v2 1/5] soundwire: Add compute_params callback Srinivas Kandagatla
2019-08-13 14:34 ` Pierre-Louis Bossart
2019-08-13 18:17 ` Srinivas Kandagatla
2019-08-13 19:08 ` Pierre-Louis Bossart
2019-08-14 4:05 ` Vinod Koul
2019-09-04 9:28 ` Vinod Koul
2019-09-04 13:36 ` [alsa-devel] " Pierre-Louis Bossart
2019-08-13 8:35 ` [PATCH v2 2/5] soundwire: stream: make stream name a const pointer Srinivas Kandagatla
2019-09-04 9:29 ` Vinod Koul
2019-08-13 8:35 ` [PATCH v2 3/5] ASoC: core: add support to snd_soc_dai_get_sdw_stream() Srinivas Kandagatla
2019-08-13 14:44 ` [alsa-devel] " Pierre-Louis Bossart
2019-08-13 16:50 ` Srinivas Kandagatla
2019-08-13 17:51 ` Pierre-Louis Bossart
2019-08-13 18:06 ` Srinivas Kandagatla
2019-08-13 19:15 ` Pierre-Louis Bossart
2019-08-13 19:18 ` Mark Brown
2019-08-13 19:38 ` Pierre-Louis Bossart
2019-08-13 19:58 ` Mark Brown
2019-08-14 4:11 ` Vinod Koul
2019-08-14 9:08 ` Mark Brown
2019-08-14 14:09 ` Pierre-Louis Bossart
2019-10-09 8:32 ` Srinivas Kandagatla
2019-10-09 14:29 ` Pierre-Louis Bossart
2019-10-09 16:01 ` Srinivas Kandagatla
2019-10-09 18:53 ` Pierre-Louis Bossart
2019-10-10 8:50 ` Srinivas Kandagatla
2019-10-10 12:03 ` Charles Keepax
2019-10-10 13:51 ` Mark Brown
2019-10-10 14:01 ` Pierre-Louis Bossart [this message]
2019-10-10 14:52 ` Srinivas Kandagatla
2019-10-10 15:49 ` Pierre-Louis Bossart
2019-10-11 12:30 ` Srinivas Kandagatla
2019-08-13 16:03 ` Cezary Rojewski
2019-08-13 16:52 ` Srinivas Kandagatla
2019-08-13 17:29 ` Cezary Rojewski
2019-08-13 19:19 ` Mark Brown
2019-08-13 8:35 ` [PATCH v2 4/5] dt-bindings: soundwire: add bindings for Qcom controller Srinivas Kandagatla
2019-08-23 7:28 ` Vinod Koul
2019-08-30 8:05 ` Srinivas Kandagatla
2019-08-13 8:35 ` [PATCH v2 5/5] soundwire: qcom: add support for SoundWire controller Srinivas Kandagatla
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