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ASoC: audio-graph: Identify 'no_pcm' DAI links for DPCM 

PCM devices are created for FE dai links with 'no-pcm' flag as '0'.
Such DAI links have CPU component which implement either pcm_construct()
or pcm_new() at component or dai level respectively. Based on this,
current patch exposes a helper function to identify such components
and populate 'no_pcm' flag for DPCM DAI link.

This helps to have BE<->BE component links where PCM devices need
not be created for CPU component involved in such links.

Signed-off-by: Sameer Pujar <spujar@nvidia.com>
Cc: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/1604329814-24779-5-git-send-email-spujar@nvidia.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Sameer Pujar 2020-11-02 20:40:11 +05:30 committed by Mark Brown
parent e6aeb375d2
commit c21cbb526c
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1 changed files with 25 additions and 0 deletions
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25
sound/soc/generic/audio-graph-card.c
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@ -111,6 +111,17 @@ static int graph_get_dai_id(struct device_node *ep)
return id;
}
static bool soc_component_is_pcm(struct snd_soc_dai_link_component *dlc)
{
struct snd_soc_dai *dai = snd_soc_find_dai_with_mutex(dlc);
if (dai && (dai->component->driver->pcm_construct ||
dai->driver->pcm_new))
return true;
return false;
}
static int asoc_simple_parse_dai(struct device_node *ep,
struct snd_soc_dai_link_component *dlc,
int *is_single_link)
@ -205,6 +216,7 @@ static int graph_dai_link_of_dpcm(struct asoc_simple_priv *priv,
int dup_codec)
{
struct device *dev = simple_priv_to_dev(priv);
struct snd_soc_card *card = simple_priv_to_card(priv);
struct snd_soc_dai_link *dai_link = simple_priv_to_link(priv, li->link);
struct simple_dai_props *dai_props = simple_priv_to_props(priv, li->link);
struct device_node *top = dev->of_node;
@ -259,6 +271,19 @@ static int graph_dai_link_of_dpcm(struct asoc_simple_priv *priv,
if (ret < 0)
goto out_put_node;
/*
* In BE<->BE connections it is not required to create
* PCM devices at CPU end of the dai link and thus 'no_pcm'
* flag needs to be set. It is useful when there are many
* BE components and some of these have to be connected to
* form a valid audio path.
*
* For example: FE <-> BE1 <-> BE2 <-> ... <-> BEn where
* there are 'n' BE components in the path.
*/
if (card->component_chaining && !soc_component_is_pcm(cpus))
dai_link->no_pcm = 1;
/* card->num_links includes Codec */
asoc_simple_canonicalize_cpu(dai_link, is_single_links);
} else {