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Subject[PATCH v3 3/4] ASoC: es8316: support fixed clock rate
Date
This patch supports some type of machine drivers that use fixed clock
rate. After applied this patch, sysclk == 0 means there is no
constraint of sound rate and other values will set constraints which
is derived by sysclk setting.

Signed-off-by: Katsuhiro Suzuki <katsuhiro@katsuster.net>

---

Changes from v2:
- Newly added
---
sound/soc/codecs/es8316.c | 24 ++++--------------------
1 file changed, 4 insertions(+), 20 deletions(-)

diff --git a/sound/soc/codecs/es8316.c b/sound/soc/codecs/es8316.c
index ab41f2c056bd..bf390bc64177 100644
--- a/sound/soc/codecs/es8316.c
+++ b/sound/soc/codecs/es8316.c
@@ -432,20 +432,6 @@ static int es8316_set_dai_fmt(struct snd_soc_dai *codec_dai,
return 0;
}

-static int es8316_pcm_startup(struct snd_pcm_substream *substream,
- struct snd_soc_dai *dai)
-{
- struct snd_soc_component *component = dai->component;
- struct es8316_priv *es8316 = snd_soc_component_get_drvdata(component);
-
- if (es8316->sysclk == 0) {
- dev_err(component->dev, "No sysclk provided\n");
- return -EINVAL;
- }
-
- return 0;
-}
-
static int es8316_pcm_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *dai)
@@ -455,17 +441,16 @@ static int es8316_pcm_hw_params(struct snd_pcm_substream *substream,
u8 wordlen = 0;
int i;

- if (!es8316->sysclk) {
- dev_err(component->dev, "No MCLK configured\n");
- return -EINVAL;
- }
-
/* Limit supported sample rates to ones that can be autodetected
* by the codec running in slave mode.
*/
for (i = 0; i < NR_SUPPORTED_MCLK_LRCK_RATIOS; i++) {
const unsigned int ratio = supported_mclk_lrck_ratios[i];

+ /* Accept any rates if sysclk is 0. */
+ if (es8316->sysclk == 0)
+ break;
+
if (es8316->sysclk % ratio != 0)
continue;
if (es8316->sysclk / ratio == params_rate(params))
@@ -509,7 +494,6 @@ static int es8316_mute(struct snd_soc_dai *dai, int mute)
SNDRV_PCM_FMTBIT_S24_LE)

static const struct snd_soc_dai_ops es8316_ops = {
- .startup = es8316_pcm_startup,
.hw_params = es8316_pcm_hw_params,
.set_fmt = es8316_set_dai_fmt,
.set_sysclk = es8316_set_dai_sysclk,
--
2.23.0.rc1
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