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ASoC: Intel: sof_sdw: Add a DAI link for loopback capture

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Add a DAI link for loopback capture as the last link to make sure
the other DAI link ID's remain unaffected. It serves as a dummy DAI link
to enable echo reference capture in the SDW topologies which do not have
an actual backend capture DAI.

Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Link: https://patch.msgid.link/20260204081833.16630-5-peter.ujfalusi@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Ranjani Sridharan 2026-02-04 10:18:27 +02:00 • committed by Mark Brown
parent af0bc3ac9a
commit e614fce9fe
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GPG key ID: 24D68B725D5487D0
1 changed files with 41 additions and 2 deletions
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43
sound/soc/intel/boards/sof_sdw.c
View file

@ -1186,6 +1186,34 @@ static int create_bt_dailinks(struct snd_soc_card *card,
return 0;
}
static int create_echoref_dailink(struct snd_soc_card *card,
struct snd_soc_dai_link **dai_links, int *be_id)
{
struct device *dev = card->dev;
int ret;
char *name = devm_kasprintf(dev, GFP_KERNEL, "Loopback_Virtual");
if (!name)
return -ENOMEM;
/*
* use dummy DAI names as this won't be connected to an actual DAI but just to establish a
* fe <-> be connection for loopback capture for echo reference
*/
ret = asoc_sdw_init_simple_dai_link(dev, *dai_links, be_id, name,
0, 1, "Loopback Virtual Pin", "dummy",
snd_soc_dummy_dlc.name, snd_soc_dummy_dlc.dai_name,
1, NULL, NULL);
if (ret)
return ret;
(*dai_links)++;
dev_dbg(dev, "Added echo reference DAI link\n");
return 0;
}
static int sof_card_dai_links_create(struct snd_soc_card *card)
{
struct device *dev = card->dev;
@ -1294,8 +1322,12 @@ static int sof_card_dai_links_create(struct snd_soc_card *card)
goto err_end;
}
/* allocate BE dailinks */
num_links = sdw_be_num + ssp_num + dmic_num + hdmi_num + bt_num;
/*
* allocate BE dailinks, add an extra DAI link for echo reference capture.
* This should be the last DAI link and it is expected both for monolithic
* and functional SOF topologies to support echo reference.
*/
num_links = sdw_be_num + ssp_num + dmic_num + hdmi_num + bt_num + 1;
dai_links = devm_kcalloc(dev, num_links, sizeof(*dai_links), GFP_KERNEL);
if (!dai_links) {
ret = -ENOMEM;
@ -1344,6 +1376,13 @@ static int sof_card_dai_links_create(struct snd_soc_card *card)
goto err_end;
}
/* dummy echo ref link. keep this as the last DAI link. The DAI link ID does not matter */
ret = create_echoref_dailink(card, &dai_links, &be_id);
if (ret) {
dev_err(dev, "failed to create echo ref dai link: %d\n", ret);
goto err_end;
}
WARN_ON(codec_conf != card->codec_conf + card->num_configs);
WARN_ON(dai_links != card->dai_link + card->num_links);