ASoC: ak4613: add hw_constraint rule for Sampling Rate

Current ak4613 accepts all range of Sampling Rate, but it depends on
inputed master clock. This patch adds hw constraint rule for it.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Tested-by: Hiroyuki Yokoyama <hiroyuki.yokoyama.vx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/codecs/ak4613.c b/sound/soc/codecs/ak4613.c
index d5beca008dea702c4c297a598ba70834b718c89c..a4520a1f849d93950322727045e0876380286cd0 100644 (file)
--- a/sound/soc/codecs/ak4613.c
+++ b/sound/soc/codecs/ak4613.c
@@ -94,6 +94,8 @@ struct ak4613_interface {
 struct ak4613_priv {
        struct mutex lock;
        const struct ak4613_interface *iface;
+       struct snd_pcm_hw_constraint_list constraint;
+       unsigned int sysclk;
 
        unsigned int fmt;
        u8 oc;
@@ -252,6 +254,50 @@ static void ak4613_dai_shutdown(struct snd_pcm_substream *substream,
        mutex_unlock(&priv->lock);
 }
 
+static void ak4613_hw_constraints(struct ak4613_priv *priv,
+                                 struct snd_pcm_runtime *runtime)
+{
+       static const unsigned int ak4613_rates[] = {
+                32000,
+                44100,
+                48000,
+                64000,
+                88200,
+                96000,
+               176400,
+               192000,
+       };
+       struct snd_pcm_hw_constraint_list *constraint = &priv->constraint;
+       unsigned int fs;
+       int i;
+
+       constraint->list        = ak4613_rates;
+       constraint->mask        = 0;
+       constraint->count       = 0;
+
+       /*
+        * Slave Mode
+        *      Normal: [32kHz, 48kHz] : 256fs,384fs or 512fs
+        *      Double: [64kHz, 96kHz] : 256fs
+        *      Quad  : [128kHz,192kHz]: 128fs
+        *
+        * Master mode
+        *      Normal: [32kHz, 48kHz] : 256fs or 512fs
+        *      Double: [64kHz, 96kHz] : 256fs
+        *      Quad  : [128kHz,192kHz]: 128fs
+       */
+       for (i = 0; i < ARRAY_SIZE(ak4613_rates); i++) {
+               /* minimum fs on each range */
+               fs = (ak4613_rates[i] <= 96000) ? 256 : 128;
+
+               if (priv->sysclk >= ak4613_rates[i] * fs)
+                       constraint->count = i + 1;
+       }
+
+       snd_pcm_hw_constraint_list(runtime, 0,
+                               SNDRV_PCM_HW_PARAM_RATE, constraint);
+}
+
 static int ak4613_dai_startup(struct snd_pcm_substream *substream,
                              struct snd_soc_dai *dai)
 {
@@ -260,6 +306,19 @@ static int ak4613_dai_startup(struct snd_pcm_substream *substream,
 
        priv->cnt++;
 
+       ak4613_hw_constraints(priv, substream->runtime);
+
+       return 0;
+}
+
+static int ak4613_dai_set_sysclk(struct snd_soc_dai *codec_dai,
+                                int clk_id, unsigned int freq, int dir)
+{
+       struct snd_soc_codec *codec = codec_dai->codec;
+       struct ak4613_priv *priv = snd_soc_codec_get_drvdata(codec);
+
+       priv->sysclk = freq;
+
        return 0;
 }
 
@@ -411,6 +470,7 @@ static int ak4613_set_bias_level(struct snd_soc_codec *codec,
 static const struct snd_soc_dai_ops ak4613_dai_ops = {
        .startup        = ak4613_dai_startup,
        .shutdown       = ak4613_dai_shutdown,
+       .set_sysclk     = ak4613_dai_set_sysclk,
        .set_fmt        = ak4613_dai_set_fmt,
        .hw_params      = ak4613_dai_hw_params,
 };
@@ -529,6 +589,7 @@ static int ak4613_i2c_probe(struct i2c_client *i2c,
 
        priv->iface             = NULL;
        priv->cnt               = 0;
+       priv->sysclk            = 0;
 
        mutex_init(&priv->lock);