The below program fails on a dai link with symmetric rates without this
patch. The patch makes it work.
#include <sys/soundcard.h>
#include <unistd.h>
#include <fcntl.h>
#include <stropts.h>
#include <stdio.h>
int
main(void)
{
int fd;
int format;
int channels;
int speed;
if ((fd = open("/dev/dsp", O_WRONLY, 0)) == -1) {
perror("open");
return 1;
}
format = AFMT_S16_LE;
if (ioctl(fd, SNDCTL_DSP_SETFMT, &format) == -1) {
perror("SNDCTL_DSP_SETFMT");
return 1;
}
channels = 2;
if (ioctl(fd, SNDCTL_DSP_CHANNELS, &channels) == -1) {
perror("SNDCTL_DSP_CHANNELS");
return 1;
}
speed = 22050;
if (ioctl(fd, SNDCTL_DSP_SPEED, &speed) == -1) {
perror("SNDCTL_DSP_SPEED");
return 1;
}
return 0;
}
Signed-off-by: Peter Rosin <peda@xxxxxxxxxx>
---
sound/soc/soc-pcm.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/sound/soc/soc-pcm.c b/sound/soc/soc-pcm.c
index 35fe58f4fa86..1e876ff23524 100644
--- a/sound/soc/soc-pcm.c
+++ b/sound/soc/soc-pcm.c
@@ -237,6 +237,14 @@ static int soc_pcm_params_symmetry(struct snd_pcm_substream *substream,
struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
unsigned int rate, channels, sample_bits, symmetry, i;
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ if (!cpu_dai->capture_active)
+ return 0;
+ } else if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
+ if (!cpu_dai->playback_active)
+ return 0;
+ }
+
rate = params_rate(params);
channels = params_channels(params);
sample_bits = snd_pcm_format_physical_width(params_format(params));
--
2.1.4
_______________________________________________
Alsa-devel mailing list
Alsa-devel@xxxxxxxxxxxxxxxx
http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
