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ASoC: dwc: add check for master/slave format

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DW i2s controller's master/slave config can be read from a
read-only register. Machine driver can try to set a master/slave
format on cpu-dai using 'set_fmt' of dai ops. A check is added to
verify codec is master when dwc is slave and vice-versa.

Signed-off-by: Maruthi Bayyavarapu <maruthi.bayyavarapu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Maruthi Srinivas Bayyavarapu 2015-10-23 17:15:41 -04:00 committed by Mark Brown
parent 1d957d862a
commit ab57b8e90c
1 changed files with 31 additions and 0 deletions
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31
sound/soc/dwc/designware_i2s.c
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@ -341,12 +341,43 @@ static int dw_i2s_trigger(struct snd_pcm_substream *substream,
return ret;
}
static int dw_i2s_set_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt)
{
struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(cpu_dai);
int ret = 0;
switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
case SND_SOC_DAIFMT_CBM_CFM:
if (dev->capability & DW_I2S_SLAVE)
ret = 0;
else
ret = -EINVAL;
break;
case SND_SOC_DAIFMT_CBS_CFS:
if (dev->capability & DW_I2S_MASTER)
ret = 0;
else
ret = -EINVAL;
break;
case SND_SOC_DAIFMT_CBM_CFS:
case SND_SOC_DAIFMT_CBS_CFM:
ret = -EINVAL;
break;
default:
dev_dbg(dev->dev, "dwc : Invalid master/slave format\n");
ret = -EINVAL;
break;
}
return ret;
}
static struct snd_soc_dai_ops dw_i2s_dai_ops = {
.startup = dw_i2s_startup,
.shutdown = dw_i2s_shutdown,
.hw_params = dw_i2s_hw_params,
.prepare = dw_i2s_prepare,
.trigger = dw_i2s_trigger,
.set_fmt = dw_i2s_set_fmt,
};
static const struct snd_soc_component_driver dw_i2s_component = {