ASoC: rt5677: Set ADC clock to use PLL and enable ASRC

Use the PLL to kept the correct 24M clock rate so frequency shift does
not occur when using the DSP VAD.
Signed-off-by: Curtis Malainey <cujomalainey@chromium.org>
Link: https://lore.kernel.org/r/20191106011335.223061-11-cujomalainey@chromium.orgSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/rt5677.c

@@ -5046,6 +5046,11 @@ static const struct snd_soc_dai_ops rt5677_aif_dai_ops = {
 	.set_tdm_slot = rt5677_set_tdm_slot,
 };
 
+static const struct snd_soc_dai_ops rt5677_dsp_dai_ops = {
+	.set_sysclk = rt5677_set_dai_sysclk,
+	.set_pll = rt5677_set_dai_pll,
+};
+
 static struct snd_soc_dai_driver rt5677_dai[] = {
 	{
 		.name = "rt5677-aif1",
@@ -5152,6 +5157,7 @@ static struct snd_soc_dai_driver rt5677_dai[] = {
 			.rates = SNDRV_PCM_RATE_16000,
 			.formats = SNDRV_PCM_FMTBIT_S16_LE,
 		},
+		.ops = &rt5677_dsp_dai_ops,
 	},
 };
 

sound/soc/codecs/rt5677.h

@@ -1336,6 +1336,8 @@
 #define RT5677_PLL_M_SFT			12
 #define RT5677_PLL_M_BP				(0x1 << 11)
 #define RT5677_PLL_M_BP_SFT			11
+#define RT5677_PLL_UPDATE_PLL1			(0x1 << 1)
+#define RT5677_PLL_UPDATE_PLL1_SFT		1
 
 /* Global Clock Control 1 (0x80) */
 #define RT5677_SCLK_SRC_MASK			(0x3 << 14)

sound/soc/intel/boards/bdw-rt5677.c

@@ -170,10 +170,37 @@ static int bdw_rt5677_hw_params(struct snd_pcm_substream *substream,
 	return ret;
 }
 
+static int bdw_rt5677_dsp_hw_params(struct snd_pcm_substream *substream,
+	struct snd_pcm_hw_params *params)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_dai *codec_dai = rtd->codec_dai;
+	int ret;
+
+	ret = snd_soc_dai_set_sysclk(codec_dai, RT5677_SCLK_S_PLL1, 24576000,
+		SND_SOC_CLOCK_IN);
+	if (ret < 0) {
+		dev_err(rtd->dev, "can't set codec sysclk configuration\n");
+		return ret;
+	}
+	ret = snd_soc_dai_set_pll(codec_dai, 0, RT5677_PLL1_S_MCLK,
+		24000000, 24576000);
+	if (ret < 0) {
+		dev_err(rtd->dev, "can't set codec pll configuration\n");
+		return ret;
+	}
+
+	return 0;
+}
+
 static const struct snd_soc_ops bdw_rt5677_ops = {
 	.hw_params = bdw_rt5677_hw_params,
 };
 
+static const struct snd_soc_ops bdw_rt5677_dsp_ops = {
+	.hw_params = bdw_rt5677_dsp_hw_params,
+};
+
 #if !IS_ENABLED(CONFIG_SND_SOC_SOF_BROADWELL)
 static int bdw_rt5677_rtd_init(struct snd_soc_pcm_runtime *rtd)
 {
@@ -213,6 +240,11 @@ static int bdw_rt5677_init(struct snd_soc_pcm_runtime *rtd)
 	rt5677_sel_asrc_clk_src(component, RT5677_DA_STEREO_FILTER |
 			RT5677_AD_STEREO1_FILTER | RT5677_I2S1_SOURCE,
 			RT5677_CLK_SEL_I2S1_ASRC);
+	/* Enable codec ASRC function for Mono ADC L.
+	 * The ASRC clock source is clk_sys2_asrc.
+	 */
+	rt5677_sel_asrc_clk_src(component, RT5677_AD_MONO_L_FILTER,
+			RT5677_CLK_SEL_SYS2);
 
 	/* Request rt5677 GPIO for headphone amp control */
 	bdw_rt5677->gpio_hp_en = devm_gpiod_get(component->dev, "headphone-enable",
@@ -291,6 +323,7 @@ static struct snd_soc_dai_link bdw_rt5677_dais[] = {
 	{
 		.name = "Codec DSP",
 		.stream_name = "Wake on Voice",
+		.ops = &bdw_rt5677_dsp_ops,
 		SND_SOC_DAILINK_REG(dsp),
 	},