[alsa-devel] [PATCH 2/2] ASoC: dpcm: symmetry constraint on FE substream

[KaiChieh Chuang]

We should set BE symmetric constraint on FE substream.

in case one BE is used by two FE1/FE2,
the first BE runtime will use FE1's substream->runtime.
hence the FE1's will be constrained by BE symmetry property.

Though, second FE2 call dpcm_apply_symmetry,
the be_substream->runtime == FE1's substream->runtime.
The FE2's substream->runtime will not be constrained
by BE's symmetry property.

Signed-off-by: KaiChieh Chuang <kaichieh.chuang at mediatek.com>
---
 sound/soc/soc-pcm.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/sound/soc/soc-pcm.c b/sound/soc/soc-pcm.c
index 481604a..1ef7514 100644
--- a/sound/soc/soc-pcm.c
+++ b/sound/soc/soc-pcm.c
@@ -1779,14 +1779,15 @@ static int dpcm_apply_symmetry(struct snd_pcm_substream *fe_substream,
 
 		/* Symmetry only applies if we've got an active stream. */
 		if (rtd->cpu_dai->active) {
-			err = soc_pcm_apply_symmetry(be_substream, rtd->cpu_dai);
+			err = soc_pcm_apply_symmetry(fe_substream,
+						     rtd->cpu_dai);
 			if (err < 0)
 				return err;
 		}
 
 		for (i = 0; i < rtd->num_codecs; i++) {
 			if (rtd->codec_dais[i]->active) {
-				err = soc_pcm_apply_symmetry(be_substream,
+				err = soc_pcm_apply_symmetry(fe_substream,
 							     rtd->codec_dais[i]);
 				if (err < 0)
 					return err;
-- 
1.9.1