diff options
| author | Sameer Pujar <spujar@nvidia.com> | 2020-11-02 16:10:11 +0100 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2020-11-10 18:28:20 +0100 |
| commit | c21cbb526c0a105d582299839a9c4244dd6bf38a (patch) | |
| tree | c41164e9d21e2b9395b75980b43ac4c77861c738 /sound/soc/generic | |
| parent | ASoC: audio-graph: Use of_node and DAI for DPCM DAI link names (diff) | |
| download | linux-c21cbb526c0a105d582299839a9c4244dd6bf38a.tar.xz linux-c21cbb526c0a105d582299839a9c4244dd6bf38a.zip | |
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>
Diffstat (limited to 'sound/soc/generic')
| -rw-r--r-- | sound/soc/generic/audio-graph-card.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/sound/soc/generic/audio-graph-card.c b/sound/soc/generic/audio-graph-card.c index 1e205629e89a..9b0684173a35 100644 --- a/sound/soc/generic/audio-graph-card.c +++ b/sound/soc/generic/audio-graph-card.c @@ -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 { |