diff options
| author | Richard Fitzgerald <rf@opensource.cirrus.com> | 2021-10-15 14:36:16 +0100 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2021-10-15 16:14:20 +0100 |
| commit | fdbd256175a1e11c1ba827112d56b9a3952e1219 (patch) | |
| tree | 356e66d37442d1a91e56a798f8646df28da768d4 /sound/soc/codecs/cs42l42.c | |
| parent | 4ae1d8f911d6fc20baefd5eb061bf6964fa22a32 (diff) | |
| download | lwn-fdbd256175a1e11c1ba827112d56b9a3952e1219.tar.gz lwn-fdbd256175a1e11c1ba827112d56b9a3952e1219.zip | |
ASoC: cs42l42: Set correct SRC MCLK
According to the datasheet the SRC MCLK must be as near as possible to
(125 * sample rate). This means it should be ~6MHz for rates up to 48k
and ~12MHz for rates above that. As per datasheet table 4-21.
Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20211015133619.4698-14-rf@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'sound/soc/codecs/cs42l42.c')
| -rw-r--r-- | sound/soc/codecs/cs42l42.c | 58 |
1 files changed, 41 insertions, 17 deletions
diff --git a/sound/soc/codecs/cs42l42.c b/sound/soc/codecs/cs42l42.c index d6d74a7bbde9..d62272d0ab8c 100644 --- a/sound/soc/codecs/cs42l42.c +++ b/sound/soc/codecs/cs42l42.c @@ -678,22 +678,6 @@ static int cs42l42_pll_config(struct snd_soc_component *component) CS42L42_FSYNC_PULSE_WIDTH_MASK, CS42L42_FRAC1_VAL(fsync - 1) << CS42L42_FSYNC_PULSE_WIDTH_SHIFT); - /* Set the sample rates (96k or lower) */ - snd_soc_component_update_bits(component, CS42L42_FS_RATE_EN, - CS42L42_FS_EN_MASK, - (CS42L42_FS_EN_IASRC_96K | - CS42L42_FS_EN_OASRC_96K) << - CS42L42_FS_EN_SHIFT); - /* Set the input/output internal MCLK clock ~12 MHz */ - snd_soc_component_update_bits(component, CS42L42_IN_ASRC_CLK, - CS42L42_CLK_IASRC_SEL_MASK, - CS42L42_CLK_IASRC_SEL_12 << - CS42L42_CLK_IASRC_SEL_SHIFT); - snd_soc_component_update_bits(component, - CS42L42_OUT_ASRC_CLK, - CS42L42_CLK_OASRC_SEL_MASK, - CS42L42_CLK_OASRC_SEL_12 << - CS42L42_CLK_OASRC_SEL_SHIFT); if (pll_ratio_table[i].mclk_src_sel == 0) { /* Pass the clock straight through */ snd_soc_component_update_bits(component, @@ -756,6 +740,39 @@ static int cs42l42_pll_config(struct snd_soc_component *component) return -EINVAL; } +static void cs42l42_src_config(struct snd_soc_component *component, unsigned int sample_rate) +{ + struct cs42l42_private *cs42l42 = snd_soc_component_get_drvdata(component); + unsigned int fs; + + /* Don't reconfigure if there is an audio stream running */ + if (cs42l42->stream_use) + return; + + /* SRC MCLK must be as close as possible to 125 * sample rate */ + if (sample_rate <= 48000) + fs = CS42L42_CLK_IASRC_SEL_6; + else + fs = CS42L42_CLK_IASRC_SEL_12; + + /* Set the sample rates (96k or lower) */ + snd_soc_component_update_bits(component, + CS42L42_FS_RATE_EN, + CS42L42_FS_EN_MASK, + (CS42L42_FS_EN_IASRC_96K | + CS42L42_FS_EN_OASRC_96K) << + CS42L42_FS_EN_SHIFT); + + snd_soc_component_update_bits(component, + CS42L42_IN_ASRC_CLK, + CS42L42_CLK_IASRC_SEL_MASK, + fs << CS42L42_CLK_IASRC_SEL_SHIFT); + snd_soc_component_update_bits(component, + CS42L42_OUT_ASRC_CLK, + CS42L42_CLK_OASRC_SEL_MASK, + fs << CS42L42_CLK_OASRC_SEL_SHIFT); +} + static int cs42l42_set_dai_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt) { struct snd_soc_component *component = codec_dai->component; @@ -846,6 +863,7 @@ static int cs42l42_pcm_hw_params(struct snd_pcm_substream *substream, unsigned int channels = params_channels(params); unsigned int width = (params_width(params) / 8) - 1; unsigned int val = 0; + int ret; cs42l42->srate = params_rate(params); cs42l42->bclk = snd_soc_params_to_bclk(params); @@ -899,7 +917,13 @@ static int cs42l42_pcm_hw_params(struct snd_pcm_substream *substream, break; } - return cs42l42_pll_config(component); + ret = cs42l42_pll_config(component); + if (ret) + return ret; + + cs42l42_src_config(component, params_rate(params)); + + return 0; } static int cs42l42_set_sysclk(struct snd_soc_dai *dai, |