From: Maruthi Srinivas Bayyavarapu <Maruthi.Bayyavarapu@xxxxxxx>
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@xxxxxxx>
---
sound/soc/dwc/designware_i2s.c | 31 +++++++++++++++++++++++++++++++
1 file changed, 31 insertions(+)
diff --git a/sound/soc/dwc/designware_i2s.c b/sound/soc/dwc/designware_i2s.c
index 3a52f82..f427325 100644
--- a/sound/soc/dwc/designware_i2s.c
+++ b/sound/soc/dwc/designware_i2s.c
@@ -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 = {
--
1.8.3.1
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