Every time the swap occours, the overrun bit of SSI RX0 is set and we need to reset the ssi. The following lines need to be added file mxc-alsa-pmic.c, function: snd_mxc_audio_capture_trigger
ssi_enable(s->ssi, false);
ssi_rx_flush_fifo(s->ssi);
ssi_enable(s->ssi, true);
-------
The complete function is:
static int
snd_mxc_audio_capture_trigger(struct snd_pcm_substream *substream, int cmd)
{
mxc_pmic_audio_t *chip;
int stream_id;
audio_stream_t *s;
int err;
chip = snd_pcm_substream_chip(substream);
stream_id = substream->pstr->stream;
s = &chip->s[stream_id];
err = 0;
/* note local interrupts are already disabled in the midlevel code */
spin_lock(&s->dma_lock);
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
pr_debug("MXC: SNDRV_PCM_TRIGGER_START\n");
s->tx_spin = 0;
/* requested stream startup */
s->active = 1;
audio_capture_dma(s);
break;
case SNDRV_PCM_TRIGGER_STOP:
pr_debug("MXC: SNDRV_PCM_TRIGGER_STOP\n");
/* requested stream shutdown */
audio_capture_stop_dma(s);
break;
case SNDRV_PCM_TRIGGER_SUSPEND:
pr_debug("MXC : SNDRV_PCM_TRIGGER_SUSPEND active = 0\n");
s->active = 0;
s->periods = 0;
break;
case SNDRV_PCM_TRIGGER_RESUME:
pr_debug("MXC: SNDRV_PCM_TRIGGER_RESUME\n");
s->active = 1;
s->tx_spin = 0;
audio_capture_dma(s);
break;
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
pr_debug("MXC: SNDRV_PCM_TRIGGER_PAUSE_PUSH\n");
s->active = 0;
break;
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
pr_debug("MXC: SNDRV_PCM_TRIGGER_PAUSE_RELEASE\n");
s->active = 1;
if (s->old_offset) {
s->tx_spin = 0;
audio_capture_dma(s);
break;
}
break;
default:
err = -EINVAL;
break;
}
ssi_enable(s->ssi, false);
ssi_rx_flush_fifo(s->ssi);
ssi_enable(s->ssi, true);
spin_unlock(&s->dma_lock);
return err;
}
