Messages in this thread | | | From | Peter Rosin <> | Subject | RE: [alsa-devel] [PATCH] ASoC: atmel_ssc_dai: Track playback and capture CMR dividers separately. | Date | Wed, 22 Oct 2014 04:47:21 +0000 |
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Hi!
> Hi Peter, > > On 10/21/2014 09:05 PM, Peter Rosin wrote: > > I did some further tests, and the following program fails without the patch: > > With the patch, it is OK?
Yes.
> > #include <sys/ioctl.h> > > #include <unistd.h> > > #include <fcntl.h> > > #include <sys/soundcard.h> > > > > int > > main(void) > > { > > int fd; > > int format; > > int channels; > > > > 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; > > } > > return 0; > > } > > > > Output: > > SNDCTL_DSP_CHANNELS: Device or resource busy > > This return from codec or from atmel_ssc_dai?
This -EBUSY definitely comes from atmel_ssc_set_dai_sysclk, when my card-driver tries to set ATMEL_SSC_CMR_DIV. With the patch, it works. (the codec is spdif-transmitter, since the i2c interface of the actual tfa9879 codec is not directly reachable from the linux cpu, but that has nothing to do with this issue).
> > (I admin to having edited the above code slightly in this mail, so I s/admin/admit/ > > might have introduced some silly bug, but you get what I mean, just > > open the device and request some parameters, and boom: -EBUSY)
Cheers, Peter
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