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ASoC: cs42xx8: add error checks for constraints in TDM mode

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In the TDM format the ADC and DAC serial ports will only operate as a
slave, the sysclk should not be less than 256FS and Quad-Speed Mode (100
to 200 kHz sample rates) is not supported by ADC. So add error checks
for these constraints.

Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Link: https://patch.msgid.link/20260225100907.686470-1-shengjiu.wang@nxp.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Shengjiu Wang
2026-02-25 18:09:07 +08:00
committed by Mark Brown
parent 2974aa42e6
commit da37bfe76b
1 changed files with 22 additions and 0 deletions
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22
sound/soc/codecs/cs42xx8.c
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@@ -40,6 +40,7 @@ struct cs42xx8_priv {
struct clk *clk;
bool slave_mode;
bool is_tdm_mode;
unsigned long sysclk;
u32 tx_channels;
struct gpio_desc *gpiod_reset;
@@ -214,6 +215,8 @@ static int cs42xx8_set_dai_fmt(struct snd_soc_dai *codec_dai,
struct cs42xx8_priv *cs42xx8 = snd_soc_component_get_drvdata(component);
u32 val;
cs42xx8->is_tdm_mode = false;
/* Set DAI format */
switch (format & SND_SOC_DAIFMT_FORMAT_MASK) {
case SND_SOC_DAIFMT_LEFT_J:
@@ -227,6 +230,7 @@ static int cs42xx8_set_dai_fmt(struct snd_soc_dai *codec_dai,
break;
case SND_SOC_DAIFMT_DSP_A:
val = CS42XX8_INTF_DAC_DIF_TDM | CS42XX8_INTF_ADC_DIF_TDM;
cs42xx8->is_tdm_mode = true;
break;
default:
dev_err(component->dev, "unsupported dai format\n");
@@ -250,6 +254,11 @@ static int cs42xx8_set_dai_fmt(struct snd_soc_dai *codec_dai,
return -EINVAL;
}
if (cs42xx8->is_tdm_mode && !cs42xx8->slave_mode) {
dev_err(component->dev, "TDM mode is supported only in slave mode\n");
return -EINVAL;
}
return 0;
}
@@ -332,6 +341,19 @@ static int cs42xx8_hw_params(struct snd_pcm_substream *substream,
cs42xx8->rate[tx] = params_rate(params);
if (cs42xx8->is_tdm_mode) {
if (cs42xx8->sysclk < 256 * cs42xx8->rate[tx]) {
dev_err(component->dev, "Unsupported sysclk in TDM mode\n");
return -EINVAL;
}
if (!tx && cs42xx8->rate[tx] > 100000) {
dev_err(component->dev,
"ADC does not support Quad-Speed Mode in TDM mode\n");
return -EINVAL;
}
}
mask = CS42XX8_FUNCMOD_MFREQ_MASK;
val = cs42xx8_ratios[i].mfreq;