ASoC: mediatek: Add common snd_soc_ops .startup() callback

MediaTek platforms are typically setting PCM rate and channels
constraints for playback, capture and HDMI/DisplayPort playback:
commonize the startup callback by adding the PCM constraints data
to the mtk_platform_card_data structure and by reusing the common
mtk_soundcard_startup() function for all of them by getting back
the parameters from the aforementioned struct.

Reviewed-by: Alexandre Mergnat <amergnat@baylibre.com>
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20240416071410.75620-8-angelogioacchino.delregno@collabora.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: AngeloGioacchino Del Regno

sound/soc/mediatek/common/mtk-soundcard-driver.c

@@ -139,6 +139,57 @@ void clean_card_reference(struct snd_soc_card *card)
 }
 EXPORT_SYMBOL_GPL(clean_card_reference);
 
+int mtk_soundcard_startup(struct snd_pcm_substream *substream,
+			  enum mtk_pcm_constraint_type ctype)
+{
+	struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
+	struct mtk_soc_card_data *soc_card = snd_soc_card_get_drvdata(rtd->card);
+	const struct mtk_pcm_constraints_data *mpc = &soc_card->card_data->pcm_constraints[ctype];
+	int ret;
+
+	if (unlikely(!mpc))
+		return -EINVAL;
+
+	ret = snd_pcm_hw_constraint_list(substream->runtime, 0,
+					 SNDRV_PCM_HW_PARAM_RATE,
+					 mpc->rates);
+	if (ret < 0) {
+		dev_err(rtd->dev, "hw_constraint_list rate failed\n");
+		return ret;
+	}
+
+	ret = snd_pcm_hw_constraint_list(substream->runtime, 0,
+					 SNDRV_PCM_HW_PARAM_CHANNELS,
+					 mpc->channels);
+	if (ret < 0) {
+		dev_err(rtd->dev, "hw_constraint_list channel failed\n");
+		return ret;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(mtk_soundcard_startup);
+
+static int mtk_soundcard_playback_startup(struct snd_pcm_substream *substream)
+{
+	return mtk_soundcard_startup(substream, MTK_CONSTRAINT_PLAYBACK);
+}
+
+const struct snd_soc_ops mtk_soundcard_common_playback_ops = {
+	.startup = mtk_soundcard_playback_startup,
+};
+EXPORT_SYMBOL_GPL(mtk_soundcard_common_playback_ops);
+
+static int mtk_soundcard_capture_startup(struct snd_pcm_substream *substream)
+{
+	return mtk_soundcard_startup(substream, MTK_CONSTRAINT_CAPTURE);
+}
+
+const struct snd_soc_ops mtk_soundcard_common_capture_ops = {
+	.startup = mtk_soundcard_capture_startup,
+};
+EXPORT_SYMBOL_GPL(mtk_soundcard_common_capture_ops);
+
 int mtk_soundcard_common_probe(struct platform_device *pdev)
 {
 	struct device_node *platform_node, *adsp_node;

sound/soc/mediatek/common/mtk-soundcard-driver.h

@@ -11,21 +11,45 @@
 
 struct mtk_sof_priv;
 struct mtk_soc_card_data;
+struct snd_pcm_hw_constraint_list;
+
+enum mtk_pcm_constraint_type {
+	MTK_CONSTRAINT_PLAYBACK,
+	MTK_CONSTRAINT_CAPTURE,
+	MTK_CONSTRAINT_HDMIDP,
+	MTK_CONSTRAINT_MAX
+};
+
+struct mtk_pcm_constraints_data {
+	const struct snd_pcm_hw_constraint_list *channels;
+	const struct snd_pcm_hw_constraint_list *rates;
+};
 
 struct mtk_platform_card_data {
 	struct snd_soc_card *card;
 	struct snd_soc_jack *jacks;
+	const struct mtk_pcm_constraints_data *pcm_constraints;
 	u8 num_jacks;
+	u8 num_pcm_constraints;
 	u8 flags;
 };
 
 struct mtk_soundcard_pdata {
 	const char *card_name;
 	struct mtk_platform_card_data *card_data;
 	const struct mtk_sof_priv *sof_priv;
+
 	int (*soc_probe)(struct mtk_soc_card_data *card_data, bool legacy);
 };
 
+/* Common playback/capture card startup ops */
+extern const struct snd_soc_ops mtk_soundcard_common_playback_ops;
+extern const struct snd_soc_ops mtk_soundcard_common_capture_ops;
+
+/* Exported for custom/extended soundcard startup ops */
+int mtk_soundcard_startup(struct snd_pcm_substream *substream,
+			  enum mtk_pcm_constraint_type ctype);
+
 int parse_dai_link_info(struct snd_soc_card *card);
 void clean_card_reference(struct snd_soc_card *card);
 int mtk_soundcard_common_probe(struct platform_device *pdev);