linux-kernel - [PATCH v4 16/23] ASoC: soc-pcm: Get all BEs along DAPM path

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Date:   Sat, 27 Jun 2020 10:23:38 +0530
From:   Sameer Pujar <spujar@...dia.com>
To:     <broonie@...nel.org>, <perex@...ex.cz>, <tiwai@...e.com>,
        <kuninori.morimoto.gx@...esas.com>, <robh+dt@...nel.org>,
        <lgirdwood@...il.com>
CC:     <thierry.reding@...il.com>, <jonathanh@...dia.com>,
        <digetx@...il.com>, <alsa-devel@...a-project.org>,
        <linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <sharadg@...dia.com>, <mkumard@...dia.com>,
        <viswanathl@...dia.com>, <rlokhande@...dia.com>,
        <dramesh@...dia.com>, <atalambedu@...dia.com>,
        <nwartikar@...dia.com>, <swarren@...dia.com>,
        <nicoleotsuka@...il.com>, Sameer Pujar <spujar@...dia.com>
Subject: [PATCH v4 16/23] ASoC: soc-pcm: Get all BEs along DAPM path

dpcm_end_walk_at_be() stops the graph walk when first BE is found for
the given FE component. In a component model we may want to connect
multiple DAIs from different components. A new flag is introduced in
'snd_soc_card', which when set allows DAI/component chaining. Later
PCM operations can be called for all these listed components for a
valid DAPM path.

Signed-off-by: Sameer Pujar <spujar@...dia.com>
---
 include/sound/soc.h | 1 +
 sound/soc/soc-pcm.c | 3 ++-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/sound/soc.h b/include/sound/soc.h
index 1e0376f..95e02a7 100644
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -1069,6 +1069,7 @@ struct snd_soc_card {
 	int num_of_dapm_widgets;
 	const struct snd_soc_dapm_route *of_dapm_routes;
 	int num_of_dapm_routes;
+	bool component_chaining;
 
 	/* lists of probed devices belonging to this card */
 	struct list_head component_dev_list;
diff --git a/sound/soc/soc-pcm.c b/sound/soc/soc-pcm.c
index 6dc21b6..7f612e3 100644
--- a/sound/soc/soc-pcm.c
+++ b/sound/soc/soc-pcm.c
@@ -1322,7 +1322,8 @@ int dpcm_path_get(struct snd_soc_pcm_runtime *fe,
 
 	/* get number of valid DAI paths and their widgets */
 	paths = snd_soc_dapm_dai_get_connected_widgets(cpu_dai, stream, list,
-			dpcm_end_walk_at_be);
+			fe->card->component_chaining ?
+				NULL : dpcm_end_walk_at_be);
 
 	dev_dbg(fe->dev, "ASoC: found %d audio %s paths\n", paths,
 			stream ? "capture" : "playback");
-- 
2.7.4