[alsa-devel] [PATCH] ASoC: fsl: fsl_ssi: Fix simultaneous capture and playback

Fabio Estevam festevam at gmail.com
Mon Sep 23 06:08:25 CEST 2013

From: Fabio Estevam <fabio.estevam at freescale.com>

When doing simultaneous capture and playback on a mx6 board we get the following

$ arecord -f cd  | aplay -f cd
imx-sgtl5000 sound.13: set sample size in capture stream first
fsl-ssi-dai 2028000.ssi: ASoC: can't open interface 2028000.ssi: -11
ALSA lib pcm_dmix.c:1018:(snd_pcm_dmix_
open) unable to open slave
aplay: main:660: audio open error: Device or resource busy
Recording WAVE 'stdin' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo

The 'arecord -f cd  | aplay -f cd' always trigger cause the 
'if (!first_runtime->sample_bits)' block to be true which returns an error.

Adjust the logic inside fsl_ssi_startup(), so that we do not always hit the 
error when playing  'arecord | aplay' line for the first time.

Reported-by: Chris Clepper <cgclepper at gmail.com>
Suggested-by: Nicolin Chen <b42378 at freescale.com>
Signed-off-by: Fabio Estevam <fabio.estevam at freescale.com>
 sound/soc/fsl/fsl_ssi.c | 15 ++++-----------
 1 file changed, 4 insertions(+), 11 deletions(-)

diff --git a/sound/soc/fsl/fsl_ssi.c b/sound/soc/fsl/fsl_ssi.c
index 6ac8730..cdbb641 100644
--- a/sound/soc/fsl/fsl_ssi.c
+++ b/sound/soc/fsl/fsl_ssi.c
@@ -469,19 +469,12 @@ static int fsl_ssi_startup(struct snd_pcm_substream *substream,
 			 * parameters, then the second stream may be
 			 * constrained to the wrong sample rate or size.
-			if (!first_runtime->sample_bits) {
-				dev_err(substream->pcm->card->dev,
-					"set sample size in %s stream first\n",
-					substream->stream ==
-					? "capture" : "playback");
-				return -EAGAIN;
-			}
-			snd_pcm_hw_constraint_minmax(substream->runtime,
+			if (first_runtime->sample_bits) {
+				snd_pcm_hw_constraint_minmax(substream->runtime,
+			}
 		ssi_private->second_stream = substream;

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