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ASoC: simple-card: Add support for codec2codec DAI links

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Following the example in cb2cf0de11 ("ASoC: soc-core: care Codec <->
Codec case by non_legacy_dai_naming"), determine if a DAI link contains
only codec DAIs by examining the non_legacy_dai_naming flag in each
DAI's component.

For now, we assume there is only one or a small set of valid PCM stream
parameters, so num_params == 1 is good enough. We also assume that the
same params are valid for all supported streams. params is set to the
subset of parameters common among all DAIs, and then the existing code
automatically chooses the highest quality of the remaining values when
the link is brought up.

Signed-off-by: Samuel Holland <samuel@sholland.org>
Link: https://lore.kernel.org/r/20200305051143.60691-4-samuel@sholland.org
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Samuel Holland 2020-03-04 23:11:43 -06:00 committed by Mark Brown
parent 5854a46486
commit 95cfc0a0aa
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GPG Key ID: 24D68B725D5487D0
2 changed files with 55 additions and 2 deletions
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9
Documentation/sound/soc/codec-to-codec.rst
View File

@ -104,5 +104,10 @@ Make sure to name your corresponding cpu and codec playback and capture
dai names ending with "Playback" and "Capture" respectively as dapm core
will link and power those dais based on the name.
Note that in current device tree there is no way to mark a dai_link
as codec to codec. However, it may change in future.
A dai_link in a "simple-audio-card" will automatically be detected as
codec to codec when all DAIs on the link belong to codec components.
The dai_link will be initialized with the subset of stream parameters
(channels, format, sample rate) supported by all DAIs on the link. Since
there is no way to provide these parameters in the device tree, this is
mostly useful for communication with simple fixed-function codecs, such
as a Bluetooth controller or cellular modem.

48
sound/soc/generic/simple-card-utils.c
View File

@ -331,6 +331,50 @@ static int asoc_simple_init_dai(struct snd_soc_dai *dai,
return 0;
}
static int asoc_simple_init_dai_link_params(struct snd_soc_pcm_runtime *rtd,
struct simple_dai_props *dai_props)
{
struct snd_soc_dai_link *dai_link = rtd->dai_link;
struct snd_soc_component *component;
struct snd_soc_pcm_stream *params;
struct snd_pcm_hardware hw;
int i, ret, stream;
/* Only codecs should have non_legacy_dai_naming set. */
for_each_rtd_components(rtd, i, component) {
if (!component->driver->non_legacy_dai_naming)
return 0;
}
/* Assumes the capabilities are the same for all supported streams */
for (stream = 0; stream < 2; stream++) {
ret = snd_soc_runtime_calc_hw(rtd, &hw, stream);
if (ret == 0)
break;
}
if (ret < 0) {
dev_err(rtd->dev, "simple-card: no valid dai_link params\n");
return ret;
}
params = devm_kzalloc(rtd->dev, sizeof(*params), GFP_KERNEL);
if (!params)
return -ENOMEM;
params->formats = hw.formats;
params->rates = hw.rates;
params->rate_min = hw.rate_min;
params->rate_max = hw.rate_max;
params->channels_min = hw.channels_min;
params->channels_max = hw.channels_max;
dai_link->params = params;
dai_link->num_params = 1;
return 0;
}
int asoc_simple_dai_init(struct snd_soc_pcm_runtime *rtd)
{
struct asoc_simple_priv *priv = snd_soc_card_get_drvdata(rtd->card);
@ -347,6 +391,10 @@ int asoc_simple_dai_init(struct snd_soc_pcm_runtime *rtd)
if (ret < 0)
return ret;
ret = asoc_simple_init_dai_link_params(rtd, dai_props);
if (ret < 0)
return ret;
return 0;
}
EXPORT_SYMBOL_GPL(asoc_simple_dai_init);