Commit 5fdd022c authored by Piotr Stankiewicz's avatar Piotr Stankiewicz Committed by Mark Brown
Browse files

ASoC: dpcm: play nice with CODEC<->CODEC links 



Currently in situations where a normal CODEC to CODEC link follows a
DPCM DAI, an error in the following form will be logged:

ASoC: can't get [playback|capture] BE for <widget name>
ASoC: no BE found for <widget name>

This happens because all widgets in a path containing a DPCM DAI will
be passed to dpcm_add_paths, which will try to interpret the CODEC<->CODEC
as if it were a DPCM DAI, in turn causing the error.

This patch aims to resolve the described issue by stopping the DPCM graph
walk, initiated from dpcm_path_get, at the first widget associated with
a DPCM BE.

Signed-off-by: default avatarPiotr Stankiewicz <piotrs@opensource.wolfsonmicro.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 6742064a

sound/soc/soc-pcm.c

+41 −1
Original line number Diff line number Diff line
@@ -1287,6 +1287,46 @@ static int widget_in_list(struct snd_soc_dapm_widget_list *list, 
	return 0;

}



static bool dpcm_end_walk_at_be(struct snd_soc_dapm_widget *widget,

		enum snd_soc_dapm_direction dir)

{

	struct snd_soc_card *card = widget->dapm->card;

	struct snd_soc_pcm_runtime *rtd;

	int i;



	if (dir == SND_SOC_DAPM_DIR_OUT) {

		list_for_each_entry(rtd, &card->rtd_list, list) {

			if (!rtd->dai_link->no_pcm)

				continue;



			if (rtd->cpu_dai->playback_widget == widget)

				return true;



			for (i = 0; i < rtd->num_codecs; ++i) {

				struct snd_soc_dai *dai = rtd->codec_dais[i];

				if (dai->playback_widget == widget)

					return true;

			}

		}

	} else { /* SND_SOC_DAPM_DIR_IN */

		list_for_each_entry(rtd, &card->rtd_list, list) {

			if (!rtd->dai_link->no_pcm)

				continue;



			if (rtd->cpu_dai->capture_widget == widget)

				return true;



			for (i = 0; i < rtd->num_codecs; ++i) {

				struct snd_soc_dai *dai = rtd->codec_dais[i];

				if (dai->capture_widget == widget)

					return true;

			}

		}

	}



	return false;

}



int dpcm_path_get(struct snd_soc_pcm_runtime *fe,

	int stream, struct snd_soc_dapm_widget_list **list)

{
@@ -1295,7 +1335,7 @@ 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,

			NULL);

			dpcm_end_walk_at_be);



	dev_dbg(fe->dev, "ASoC: found %d audio %s paths\n", paths,

			stream ? "capture" : "playback");

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