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ASoC: atmel_ssc_dai: add dai trigger ops 

According to the SSC specifiation, it should be enabled after DMA is
enabled. So, add trigger operation to make sure the right sequence.

Signed-off-by: Bo Shen <voice.shen@atmel.com>
Tested-by: Richard Genoud <richard.genoud@gmail.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Bo Shen 2013-12-04 10:37:03 +08:00 committed by Mark Brown
parent 46bec25da6
commit a8f1f100ad
1 changed files with 29 additions and 1 deletions
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30
sound/soc/atmel/atmel_ssc_dai.c
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@ -648,7 +648,7 @@ static int atmel_ssc_prepare(struct snd_pcm_substream *substream,
dma_params = ssc_p->dma_params[dir];
ssc_writel(ssc_p->ssc->regs, CR, dma_params->mask->ssc_enable);
ssc_writel(ssc_p->ssc->regs, CR, dma_params->mask->ssc_disable);
ssc_writel(ssc_p->ssc->regs, IDR, dma_params->mask->ssc_error);
pr_debug("%s enabled SSC_SR=0x%08x\n",
@ -657,6 +657,33 @@ static int atmel_ssc_prepare(struct snd_pcm_substream *substream,
return 0;
}
static int atmel_ssc_trigger(struct snd_pcm_substream *substream,
int cmd, struct snd_soc_dai *dai)
{
struct atmel_ssc_info *ssc_p = &ssc_info[dai->id];
struct atmel_pcm_dma_params *dma_params;
int dir;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
dir = 0;
else
dir = 1;
dma_params = ssc_p->dma_params[dir];
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
ssc_writel(ssc_p->ssc->regs, CR, dma_params->mask->ssc_enable);
break;
default:
ssc_writel(ssc_p->ssc->regs, CR, dma_params->mask->ssc_disable);
break;
}
return 0;
}
#ifdef CONFIG_PM
static int atmel_ssc_suspend(struct snd_soc_dai *cpu_dai)
@ -731,6 +758,7 @@ static const struct snd_soc_dai_ops atmel_ssc_dai_ops = {
.startup = atmel_ssc_startup,
.shutdown = atmel_ssc_shutdown,
.prepare = atmel_ssc_prepare,
.trigger = atmel_ssc_trigger,
.hw_params = atmel_ssc_hw_params,
.set_fmt = atmel_ssc_set_dai_fmt,
.set_clkdiv = atmel_ssc_set_dai_clkdiv,