[PATCH 02/11] ASoC: apple: Explain DAI startup return value handling

[phucduc . bui]

From: bui duc phuc <phucduc.bui@xxxxxxxxx>

Add a comment explaining why .startup() must return 0 on success
to ensure the DAI is correctly marked as started and prevent
future changes from reintroducing the issue.

Signed-off-by: bui duc phuc <phucduc.bui@xxxxxxxxx>
---
 sound/soc/apple/mca.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/sound/soc/apple/mca.c b/sound/soc/apple/mca.c
index 3585432ad49b..26022a42a95e 100644
--- a/sound/soc/apple/mca.c
+++ b/sound/soc/apple/mca.c
@@ -535,6 +535,11 @@ static int mca_fe_startup(struct snd_pcm_substream *substream,
 	if (ret < 0)
 		return ret;
 
+	/*
+	 * ASoC only marks the DAI as started when .startup() returns 0.
+	 * Since snd_pcm_hw_constraint_minmax() may return 1, explicitly
+	 * return 0 to ensure the DAI is correctly marked as started.
+	 */
 	return 0;
 }
 
-- 
2.43.0