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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