Hi Peter,
On 10/22/2014 12:47 PM, Peter Rosin wrote:
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 try to reproduce it (using the code your pasted directly) on atmel
sama5d3xek with wm8904 code, don't meet this error.
I also go through the OSS code, I still don't find this is related with
atmel_ssc_set_dai_sysclk.
So, am I missing something or something else?
(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
Best Regards,
Bo Shen
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