From: Sameer Pujar <spujar@nvidia.com>
To: <broonie@kernel.org>, <perex@perex.cz>, <tiwai@suse.com>,
<kuninori.morimoto.gx@renesas.com>, <robh+dt@kernel.org>,
<lgirdwood@gmail.com>
Cc: <thierry.reding@gmail.com>, <jonathanh@nvidia.com>,
<alsa-devel@alsa-project.org>, <linux-tegra@vger.kernel.org>,
<linux-kernel@vger.kernel.org>, <sharadg@nvidia.com>,
<mkumard@nvidia.com>, <viswanathl@nvidia.com>,
<rlokhande@nvidia.com>, <dramesh@nvidia.com>,
<atalambedu@nvidia.com>, <nwartikar@nvidia.com>,
<swarren@nvidia.com>, <nicoleotsuka@gmail.com>,
Sameer Pujar <spujar@nvidia.com>
Subject: [PATCH v2 3/9] ASoC: audio-graph: Identify 'no_pcm' DAI links for DPCM
Date: Wed, 5 Aug 2020 10:54:18 +0530 [thread overview]
Message-ID: <1596605064-27748-4-git-send-email-spujar@nvidia.com> (raw)
In-Reply-To: <1596605064-27748-1-git-send-email-spujar@nvidia.com>
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>
---
sound/soc/generic/audio-graph-card.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
diff --git a/sound/soc/generic/audio-graph-card.c b/sound/soc/generic/audio-graph-card.c
index 1e20562..93bddf6 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(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)
@@ -259,6 +270,16 @@ 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.
+ */
+ if (!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 {
--
2.7.4
next prev parent reply other threads:[~2020-08-05 5:25 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-05 5:24 [PATCH v2 0/9] Audio graph card updates and usage with Tegra210 audio Sameer Pujar
2020-08-05 5:24 ` [PATCH v2 1/9] ASoC: soc-core: Fix component name_prefix parsing Sameer Pujar
2020-08-05 5:24 ` [PATCH v2 2/9] ASoC: audio-graph: Use of_node and DAI for DPCM DAI link names Sameer Pujar
2020-08-18 2:39 ` Kuninori Morimoto
2020-08-05 5:24 ` Sameer Pujar [this message]
2020-08-18 2:41 ` [PATCH v2 3/9] ASoC: audio-graph: Identify 'no_pcm' DAI links for DPCM Kuninori Morimoto
2020-08-18 8:06 ` Sameer Pujar
2020-08-18 5:23 ` Kuninori Morimoto
2020-08-18 8:04 ` Sameer Pujar
[not found] ` <2d3aa11e-3c56-1f7a-3d41-2457f973d55b@nvidia.com>
2020-08-25 4:54 ` Kuninori Morimoto
2020-08-25 5:15 ` Sameer Pujar
2020-08-25 5:40 ` Kuninori Morimoto
2020-08-25 5:53 ` Sameer Pujar
2020-08-25 6:46 ` Kuninori Morimoto
2020-08-25 7:18 ` Sameer Pujar
2020-08-26 23:12 ` Kuninori Morimoto
2020-08-29 10:52 ` Sameer Pujar
2020-08-05 5:24 ` [PATCH v2 4/9] ASoC: soc-pcm: Get all BEs along DAPM path Sameer Pujar
2020-08-05 5:24 ` [PATCH v2 5/9] ASoC: dt-bindings: audio-graph-card: Support for component chaining Sameer Pujar
2020-08-05 5:24 ` [PATCH v2 6/9] ASoC: audio-graph: Add support " Sameer Pujar
2020-08-05 5:24 ` [PATCH v2 7/9] ASoC: audio-graph: Support empty Codec endpoint Sameer Pujar
2020-08-05 5:24 ` [PATCH v2 8/9] arm64: tegra: Audio graph header for Tegra210 Sameer Pujar
2020-08-05 5:24 ` [PATCH v2 9/9] arm64: tegra: Audio graph sound card for Jetson Nano and TX1 Sameer Pujar
2020-08-17 1:53 ` [PATCH v2 0/9] Audio graph card updates and usage with Tegra210 audio Kuninori Morimoto
2020-08-20 9:02 ` Sameer Pujar
2020-08-20 23:00 ` Kuninori Morimoto
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