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ASoC: tlv320aic3x: Add TDM support 

TDM support is achieved using DSP transfer mode and setting a
programmable offset which specifies where data begins with
respect to the frame sync.

It requires 256-clock mode if CODEC is master (not currently
supported in the driver). No additional dependency if CODEC
is slave.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Peter Ujfalusi 2014-11-10 12:27:33 +02:00 committed by Mark Brown
parent f114040e3e
commit 3684940933
2 changed files with 60 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

62
sound/soc/codecs/tlv320aic3x.c
View File

@ -78,6 +78,8 @@ struct aic3x_priv {
struct aic3x_disable_nb disable_nb[AIC3X_NUM_SUPPLIES];
struct aic3x_setup_data *setup;
unsigned int sysclk;
unsigned int dai_fmt;
unsigned int tdm_delay;
struct list_head list;
int master;
int gpio_reset;
@ -1009,6 +1011,25 @@ found:
return 0;
}
static int aic3x_prepare(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct snd_soc_codec *codec = dai->codec;
struct aic3x_priv *aic3x = snd_soc_codec_get_drvdata(codec);
int delay = 0;
/* TDM slot selection only valid in DSP_A/_B mode */
if (aic3x->dai_fmt == SND_SOC_DAIFMT_DSP_A)
delay += (aic3x->tdm_delay + 1);
else if (aic3x->dai_fmt == SND_SOC_DAIFMT_DSP_B)
delay += aic3x->tdm_delay;
/* Configure data delay */
snd_soc_write(codec, AIC3X_ASD_INTF_CTRLC, aic3x->tdm_delay);
return 0;
}
static int aic3x_mute(struct snd_soc_dai *dai, int mute)
{
struct snd_soc_codec *codec = dai->codec;
@ -1048,7 +1069,6 @@ static int aic3x_set_dai_fmt(struct snd_soc_dai *codec_dai,
struct snd_soc_codec *codec = codec_dai->codec;
struct aic3x_priv *aic3x = snd_soc_codec_get_drvdata(codec);
u8 iface_areg, iface_breg;
int delay = 0;
iface_areg = snd_soc_read(codec, AIC3X_ASD_INTF_CTRLA) & 0x3f;
iface_breg = snd_soc_read(codec, AIC3X_ASD_INTF_CTRLB) & 0x3f;
@ -1076,7 +1096,6 @@ static int aic3x_set_dai_fmt(struct snd_soc_dai *codec_dai,
case (SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF):
break;
case (SND_SOC_DAIFMT_DSP_A | SND_SOC_DAIFMT_IB_NF):
delay = 1;
case (SND_SOC_DAIFMT_DSP_B | SND_SOC_DAIFMT_IB_NF):
iface_breg |= (0x01 << 6);
break;
@ -1090,10 +1109,45 @@ static int aic3x_set_dai_fmt(struct snd_soc_dai *codec_dai,
return -EINVAL;
}
aic3x->dai_fmt = fmt & SND_SOC_DAIFMT_FORMAT_MASK;
/* set iface */
snd_soc_write(codec, AIC3X_ASD_INTF_CTRLA, iface_areg);
snd_soc_write(codec, AIC3X_ASD_INTF_CTRLB, iface_breg);
snd_soc_write(codec, AIC3X_ASD_INTF_CTRLC, delay);
return 0;
}
static int aic3x_set_dai_tdm_slot(struct snd_soc_dai *codec_dai,
unsigned int tx_mask, unsigned int rx_mask,
int slots, int slot_width)
{
struct snd_soc_codec *codec = codec_dai->codec;
struct aic3x_priv *aic3x = snd_soc_codec_get_drvdata(codec);
unsigned int lsb;
if (tx_mask != rx_mask) {
dev_err(codec->dev, "tx and rx masks must be symmetric\n");
return -EINVAL;
}
if (unlikely(!tx_mask)) {
dev_err(codec->dev, "tx and rx masks need to be non 0\n");
return -EINVAL;
}
/* TDM based on DSP mode requires slots to be adjacent */
lsb = __ffs(tx_mask);
if ((lsb + 1) != __fls(tx_mask)) {
dev_err(codec->dev, "Invalid mask, slots must be adjacent\n");
return -EINVAL;
}
aic3x->tdm_delay = lsb * slot_width;
/* DOUT in high-impedance on inactive bit clocks */
snd_soc_update_bits(codec, AIC3X_ASD_INTF_CTRLA,
DOUT_TRISTATE, DOUT_TRISTATE);
return 0;
}
@ -1212,9 +1266,11 @@ static int aic3x_set_bias_level(struct snd_soc_codec *codec,
static const struct snd_soc_dai_ops aic3x_dai_ops = {
.hw_params = aic3x_hw_params,
.prepare = aic3x_prepare,
.digital_mute = aic3x_mute,
.set_sysclk = aic3x_set_dai_sysclk,
.set_fmt = aic3x_set_dai_fmt,
.set_tdm_slot = aic3x_set_dai_tdm_slot,
};
static struct snd_soc_dai_driver aic3x_dai = {

1
sound/soc/codecs/tlv320aic3x.h
View File

@ -169,6 +169,7 @@
/* Audio serial data interface control register A bits */
#define BIT_CLK_MASTER 0x80
#define WORD_CLK_MASTER 0x40
#define DOUT_TRISTATE 0x20
/* Codec Datapath setup register 7 */
#define FSREF_44100 (1 << 7)