[PATCH] ASoC: mediatek: mt8188: add constraints for PCM

[Trevor Wu]

For certain projects, only a limited number of parameters are necessary.
Therefore, it may be beneficial to add constraints that restrict the
capacity of the PCM.

Signed-off-by: Trevor Wu <trevor.wu at mediatek.com>
---
 sound/soc/mediatek/mt8188/mt8188-mt6359.c | 145 +++++++++++++++++++++-
 1 file changed, 144 insertions(+), 1 deletion(-)

diff --git a/sound/soc/mediatek/mt8188/mt8188-mt6359.c b/sound/soc/mediatek/mt8188/mt8188-mt6359.c
index ac69c23e0da1..0e4e1b8c99e2 100644
--- a/sound/soc/mediatek/mt8188/mt8188-mt6359.c
+++ b/sound/soc/mediatek/mt8188/mt8188-mt6359.c
@@ -30,6 +30,7 @@
  #define TEST_MISO_DONE_2	BIT(29)
 
 #define NAU8825_HS_PRESENT	BIT(0)
+#define DPCM_FE_CONSTRAINT	BIT(16)
 
 /*
  * Maxim MAX98390
@@ -452,6 +453,143 @@ enum {
 	DAI_LINK_UL_SRC_BE,
 };
 
+static int mt8188_playback_startup(struct snd_pcm_substream *substream)
+{
+	static const unsigned int rates[] = {
+		48000
+	};
+	static const unsigned int channels[] = {
+		2
+	};
+	static const struct snd_pcm_hw_constraint_list constraints_rates = {
+		.count = ARRAY_SIZE(rates),
+		.list  = rates,
+		.mask = 0,
+	};
+	static const struct snd_pcm_hw_constraint_list constraints_channels = {
+		.count = ARRAY_SIZE(channels),
+		.list  = channels,
+		.mask = 0,
+	};
+
+	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct mt8188_mt6359_priv *priv = snd_soc_card_get_drvdata(rtd->card);
+	struct mt8188_card_data *data = (struct mt8188_card_data *)priv->private_data;
+	int ret;
+
+	if (!(data->quirk & DPCM_FE_CONSTRAINT))
+		return 0;
+
+	ret = snd_pcm_hw_constraint_list(runtime, 0,
+					 SNDRV_PCM_HW_PARAM_RATE,
+					 &constraints_rates);
+	if (ret < 0) {
+		dev_err(rtd->dev, "hw_constraint_list rate failed\n");
+		return ret;
+	}
+
+	ret = snd_pcm_hw_constraint_list(runtime, 0,
+					 SNDRV_PCM_HW_PARAM_CHANNELS,
+					 &constraints_channels);
+	if (ret < 0) {
+		dev_err(rtd->dev, "hw_constraint_list channel failed\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static const struct snd_soc_ops mt8188_playback_ops = {
+	.startup = mt8188_playback_startup,
+};
+
+static int mt8188_capture_startup(struct snd_pcm_substream *substream)
+{
+	static const unsigned int rates[] = {
+		48000
+	};
+	static const struct snd_pcm_hw_constraint_list constraints_rates = {
+		.count = ARRAY_SIZE(rates),
+		.list  = rates,
+		.mask = 0,
+	};
+
+	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct mt8188_mt6359_priv *priv = snd_soc_card_get_drvdata(rtd->card);
+	struct mt8188_card_data *data = (struct mt8188_card_data *)priv->private_data;
+	int ret;
+
+	if (!(data->quirk & DPCM_FE_CONSTRAINT))
+		return 0;
+
+	ret = snd_pcm_hw_constraint_list(runtime, 0,
+					 SNDRV_PCM_HW_PARAM_RATE,
+					 &constraints_rates);
+	if (ret < 0) {
+		dev_err(rtd->dev, "hw_constraint_list rate failed\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static const struct snd_soc_ops mt8188_capture_ops = {
+	.startup = mt8188_capture_startup,
+};
+
+static int mt8188_hdmi_dptx_startup(struct snd_pcm_substream *substream)
+{
+	static const unsigned int rates[] = {
+		48000
+	};
+	static const unsigned int channels[] = {
+		2, 4, 6, 8
+	};
+	static const struct snd_pcm_hw_constraint_list constraints_rates = {
+		.count = ARRAY_SIZE(rates),
+		.list  = rates,
+		.mask = 0,
+	};
+	static const struct snd_pcm_hw_constraint_list constraints_channels = {
+		.count = ARRAY_SIZE(channels),
+		.list  = channels,
+		.mask = 0,
+	};
+
+	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct mt8188_mt6359_priv *priv = snd_soc_card_get_drvdata(rtd->card);
+	struct mt8188_card_data *data = (struct mt8188_card_data *)priv->private_data;
+	int ret;
+
+	if (!(data->quirk & DPCM_FE_CONSTRAINT))
+		return 0;
+
+	ret = snd_pcm_hw_constraint_list(runtime, 0,
+					 SNDRV_PCM_HW_PARAM_RATE,
+					 &constraints_rates);
+	if (ret < 0) {
+		dev_err(rtd->dev, "hw_constraint_list rate failed\n");
+		return ret;
+	}
+
+	ret = snd_pcm_hw_constraint_list(runtime, 0,
+					 SNDRV_PCM_HW_PARAM_CHANNELS,
+					 &constraints_channels);
+	if (ret < 0) {
+		dev_err(rtd->dev, "hw_constraint_list channel failed\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static const struct snd_soc_ops mt8188_hdmi_dptx_playback_ops = {
+	.startup = mt8188_hdmi_dptx_startup,
+};
+
 static int mt8188_dptx_hw_params(struct snd_pcm_substream *substream,
 				 struct snd_pcm_hw_params *params)
 {
@@ -723,6 +861,7 @@ static struct snd_soc_dai_link mt8188_mt6359_dai_links[] = {
 		},
 		.dynamic = 1,
 		.dpcm_playback = 1,
+		.ops = &mt8188_playback_ops,
 		SND_SOC_DAILINK_REG(playback2),
 	},
 	[DAI_LINK_DL3_FE] = {
@@ -734,6 +873,7 @@ static struct snd_soc_dai_link mt8188_mt6359_dai_links[] = {
 		},
 		.dynamic = 1,
 		.dpcm_playback = 1,
+		.ops = &mt8188_playback_ops,
 		SND_SOC_DAILINK_REG(playback3),
 	},
 	[DAI_LINK_DL6_FE] = {
@@ -778,6 +918,7 @@ static struct snd_soc_dai_link mt8188_mt6359_dai_links[] = {
 		},
 		.dynamic = 1,
 		.dpcm_playback = 1,
+		.ops = &mt8188_hdmi_dptx_playback_ops,
 		SND_SOC_DAILINK_REG(playback10),
 	},
 	[DAI_LINK_DL11_FE] = {
@@ -833,6 +974,7 @@ static struct snd_soc_dai_link mt8188_mt6359_dai_links[] = {
 		},
 		.dynamic = 1,
 		.dpcm_capture = 1,
+		.ops = &mt8188_capture_ops,
 		SND_SOC_DAILINK_REG(capture4),
 	},
 	[DAI_LINK_UL5_FE] = {
@@ -844,6 +986,7 @@ static struct snd_soc_dai_link mt8188_mt6359_dai_links[] = {
 		},
 		.dynamic = 1,
 		.dpcm_capture = 1,
+		.ops = &mt8188_capture_ops,
 		SND_SOC_DAILINK_REG(capture5),
 	},
 	[DAI_LINK_UL6_FE] = {
@@ -1122,7 +1265,7 @@ static struct mt8188_card_data mt8188_evb_card = {
 
 static struct mt8188_card_data mt8188_nau8825_card = {
 	.name = "mt8188_nau8825",
-	.quirk = NAU8825_HS_PRESENT,
+	.quirk = NAU8825_HS_PRESENT | DPCM_FE_CONSTRAINT,
 };
 
 static const struct of_device_id mt8188_mt6359_dt_match[] = {
-- 
2.18.0