ASoC: mediatek: mt8195: add DPTX audio support

This patch adds DPTX audio support on mt8195-mt6359-rt1019-rt5682 board.
Signed-off-by: Trevor Wu <trevor.wu@mediatek.com>
Link: https://lore.kernel.org/r/20210819084144.18483-10-trevor.wu@mediatek.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/mediatek/Kconfig

@@ -202,6 +202,7 @@ config SND_SOC_MT8195_MT6359_RT1019_RT5682
 	select SND_SOC_RT1015P
 	select SND_SOC_RT5682_I2C
 	select SND_SOC_DMIC
+	select SND_SOC_HDMI_CODEC
 	help
 	  This adds ASoC driver for Mediatek MT8195 boards
 	  with the MT6359 RT1019 RT5682 audio codec.

sound/soc/mediatek/mt8195/mt8195-mt6359-rt1019-rt5682.c

@@ -27,6 +27,7 @@
 
 struct mt8195_mt6359_rt1019_rt5682_priv {
 	struct snd_soc_jack headset_jack;
+	struct snd_soc_jack dp_jack;
 };
 
 static const struct snd_soc_dapm_widget
@@ -327,6 +328,52 @@ static int mt8195_etdm_hw_params_fixup(struct snd_soc_pcm_runtime *rtd,
 	return 0;
 }
 
+static int mt8195_hdmitx_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;
+	int ret;
+
+	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 mt8195_hdmitx_dptx_playback_ops = {
+	.startup = mt8195_hdmitx_dptx_startup,
+};
+
 static int mt8195_dptx_hw_params(struct snd_pcm_substream *substream,
 				 struct snd_pcm_hw_params *params)
 {
@@ -344,8 +391,25 @@ static struct snd_soc_ops mt8195_dptx_ops = {
 	.hw_params = mt8195_dptx_hw_params,
 };
 
-static int mt8195_dptx_hw_params_fixup(struct snd_soc_pcm_runtime *rtd,
+static int mt8195_dptx_codec_init(struct snd_soc_pcm_runtime *rtd)
+{
+	struct mt8195_mt6359_rt1019_rt5682_priv *priv =
+		snd_soc_card_get_drvdata(rtd->card);
+	struct snd_soc_component *cmpnt_codec =
+		asoc_rtd_to_codec(rtd, 0)->component;
+	int ret = 0;
+
+	ret = snd_soc_card_jack_new(rtd->card, "DP Jack", SND_JACK_LINEOUT,
+				    &priv->dp_jack, NULL, 0);
+	if (ret)
+		return ret;
+
+	return snd_soc_component_set_jack(cmpnt_codec, &priv->dp_jack, NULL);
+}
+
+static int mt8195_hdmitx_dptx_hw_params_fixup(struct snd_soc_pcm_runtime *rtd,
 					      struct snd_pcm_hw_params *params)
+
 {
 	/* fix BE i2s format to 32bit, clean param mask first */
 	snd_mask_reset_range(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT),
@@ -687,6 +751,7 @@ static struct snd_soc_dai_link mt8195_mt6359_rt1019_rt5682_dai_links[] = {
 		},
 		.dynamic = 1,
 		.dpcm_playback = 1,
+		.ops = &mt8195_hdmitx_dptx_playback_ops,
 		SND_SOC_DAILINK_REG(DL10_FE),
 	},
 	[DAI_LINK_DL11_FE] = {
@@ -820,7 +885,7 @@ static struct snd_soc_dai_link mt8195_mt6359_rt1019_rt5682_dai_links[] = {
 		.no_pcm = 1,
 		.dpcm_playback = 1,
 		.ops = &mt8195_dptx_ops,
-		.be_hw_params_fixup = mt8195_dptx_hw_params_fixup,
+		.be_hw_params_fixup = mt8195_hdmitx_dptx_hw_params_fixup,
 		SND_SOC_DAILINK_REG(DPTX_BE),
 	},
 	[DAI_LINK_ETDM1_IN_BE] = {
@@ -915,7 +980,6 @@ static int mt8195_mt6359_rt1019_rt5682_dev_probe(struct platform_device *pdev)
 	struct device_node *platform_node;
 	struct snd_soc_dai_link *dai_link;
 	struct mt8195_mt6359_rt1019_rt5682_priv *priv = NULL;
-
 	int ret, i;
 
 	card->dev = &pdev->dev;
@@ -930,6 +994,20 @@ static int mt8195_mt6359_rt1019_rt5682_dev_probe(struct platform_device *pdev)
 	for_each_card_prelinks(card, i, dai_link) {
 		if (!dai_link->platforms->name)
 			dai_link->platforms->of_node = platform_node;
+
+		if (strcmp(dai_link->name, "DPTX_BE") == 0) {
+			dai_link->codecs->of_node =
+				of_parse_phandle(pdev->dev.of_node,
+						 "mediatek,dptx-codec", 0);
+			if (!dai_link->codecs->of_node) {
+				dev_err(&pdev->dev, "Property 'dptx-codec' missing or invalid\n");
+				return -EINVAL;
+			}
+
+			dai_link->codecs->name = NULL;
+			dai_link->codecs->dai_name = "i2s-hifi";
+			dai_link->init = mt8195_dptx_codec_init;
+		}
 	}
 
 	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
@@ -940,7 +1018,7 @@ static int mt8195_mt6359_rt1019_rt5682_dev_probe(struct platform_device *pdev)
 
 	ret = devm_snd_soc_register_card(&pdev->dev, card);
 	if (ret)
-		dev_dbg(&pdev->dev, "%s snd_soc_register_card fail %d\n",
+		dev_err(&pdev->dev, "%s snd_soc_register_card fail %d\n",
 			__func__, ret);
 	return ret;
 }