ASoC: cros_ec_codec: Support setting bclk ratio

Support setting bclk ratio from machine drivers.
Signed-off-by: Yu-Hsuan Hsu <yuhsuan@chromium.org>
Reviewed-by: Tzung-Bi Shih <tzungbi@google.com>
Link: https://lore.kernel.org/r/20200125162917.247485-1-yuhsuan@chromium.orgSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/cros_ec_codec.c

@@ -45,6 +45,9 @@ struct cros_ec_codec_priv {
 	/* DMIC */
 	atomic_t dmic_probed;
 
+	/* I2S_RX */
+	uint32_t i2s_rx_bclk_ratio;
+
 	/* WoV */
 	bool wov_enabled;
 	uint8_t *wov_audio_shm_p;
@@ -259,6 +262,7 @@ static int i2s_rx_hw_params(struct snd_pcm_substream *substream,
 		snd_soc_component_get_drvdata(component);
 	struct ec_param_ec_codec_i2s_rx p;
 	enum ec_codec_i2s_rx_sample_depth depth;
+	uint32_t bclk;
 	int ret;
 
 	if (params_rate(params) != 48000)
@@ -284,15 +288,29 @@ static int i2s_rx_hw_params(struct snd_pcm_substream *substream,
 	if (ret < 0)
 		return ret;
 
-	dev_dbg(component->dev, "set bclk to %u\n",
-		snd_soc_params_to_bclk(params));
+	if (priv->i2s_rx_bclk_ratio)
+		bclk = params_rate(params) * priv->i2s_rx_bclk_ratio;
+	else
+		bclk = snd_soc_params_to_bclk(params);
+
+	dev_dbg(component->dev, "set bclk to %u\n", bclk);
 
 	p.cmd = EC_CODEC_I2S_RX_SET_BCLK;
-	p.set_bclk_param.bclk = snd_soc_params_to_bclk(params);
+	p.set_bclk_param.bclk = bclk;
 	return send_ec_host_command(priv->ec_device, EC_CMD_EC_CODEC_I2S_RX,
 				    (uint8_t *)&p, sizeof(p), NULL, 0);
 }
 
+static int i2s_rx_set_bclk_ratio(struct snd_soc_dai *dai, unsigned int ratio)
+{
+	struct snd_soc_component *component = dai->component;
+	struct cros_ec_codec_priv *priv =
+		snd_soc_component_get_drvdata(component);
+
+	priv->i2s_rx_bclk_ratio = ratio;
+	return 0;
+}
+
 static int i2s_rx_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
 {
 	struct snd_soc_component *component = dai->component;
@@ -340,6 +358,7 @@ static int i2s_rx_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
 static const struct snd_soc_dai_ops i2s_rx_dai_ops = {
 	.hw_params = i2s_rx_hw_params,
 	.set_fmt = i2s_rx_set_fmt,
+	.set_bclk_ratio = i2s_rx_set_bclk_ratio,
 };
 
 static int i2s_rx_event(struct snd_soc_dapm_widget *w,