ASoC: mediatek: common: Constify struct mtk_sof_priv

Apart from a dai_link_list variable, the mtk_sof_priv currently holds
data that never gets modified during runtime.

Constify the mtk_sof_priv structure and move the SOF dai_link_list as
sof_dai_link_list in struct mtk_soc_card_data, which is a structure
that already holds the card's machine specific, runtime modified data.

This allows to safely pass the mtk_sof_priv structure as platform data
for the commonized card probe mechanism.
Reviewed-by: Alexandre Mergnat <amergnat@baylibre.com>
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20240416071410.75620-3-angelogioacchino.delregno@collabora.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/mediatek/common/mtk-dsp-sof-common.c

@@ -15,7 +15,7 @@ int mtk_sof_dai_link_fixup(struct snd_soc_pcm_runtime *rtd,
 {
 	struct snd_soc_card *card = rtd->card;
 	struct mtk_soc_card_data *soc_card_data = snd_soc_card_get_drvdata(card);
-	struct mtk_sof_priv *sof_priv = soc_card_data->sof_priv;
+	const struct mtk_sof_priv *sof_priv = soc_card_data->sof_priv;
 	int i, j, ret = 0;
 
 	for (i = 0; i < sof_priv->num_streams; i++) {
@@ -55,7 +55,6 @@ int mtk_sof_card_probe(struct snd_soc_card *card)
 	int i;
 	struct snd_soc_dai_link *dai_link;
 	struct mtk_soc_card_data *soc_card_data = snd_soc_card_get_drvdata(card);
-	struct mtk_sof_priv *sof_priv = soc_card_data->sof_priv;
 
 	/* Set stream_name to help sof bind widgets */
 	for_each_card_prelinks(card, i, dai_link) {
@@ -63,7 +62,7 @@ int mtk_sof_card_probe(struct snd_soc_card *card)
 			dai_link->stream_name = dai_link->name;
 	}
 
-	INIT_LIST_HEAD(&sof_priv->dai_link_list);
+	INIT_LIST_HEAD(&soc_card_data->sof_dai_link_list);
 
 	return 0;
 }
@@ -73,7 +72,7 @@ static struct snd_soc_pcm_runtime *mtk_sof_find_tplg_be(struct snd_soc_pcm_runti
 {
 	struct snd_soc_card *card = rtd->card;
 	struct mtk_soc_card_data *soc_card_data = snd_soc_card_get_drvdata(card);
-	struct mtk_sof_priv *sof_priv = soc_card_data->sof_priv;
+	const struct mtk_sof_priv *sof_priv = soc_card_data->sof_priv;
 	struct snd_soc_pcm_runtime *fe;
 	struct snd_soc_pcm_runtime *be;
 	struct snd_soc_dpcm *dpcm;
@@ -113,7 +112,7 @@ static int mtk_sof_check_tplg_be_dai_link_fixup(struct snd_soc_pcm_runtime *rtd,
 {
 	struct snd_soc_card *card = rtd->card;
 	struct mtk_soc_card_data *soc_card_data = snd_soc_card_get_drvdata(card);
-	struct mtk_sof_priv *sof_priv = soc_card_data->sof_priv;
+	const struct mtk_sof_priv *sof_priv = soc_card_data->sof_priv;
 	struct snd_soc_pcm_runtime *sof_be;
 	struct mtk_dai_link *dai_link;
 	int ret = 0;
@@ -125,7 +124,7 @@ static int mtk_sof_check_tplg_be_dai_link_fixup(struct snd_soc_pcm_runtime *rtd,
 		else if (sof_be->dai_link->be_hw_params_fixup)
 			ret = sof_be->dai_link->be_hw_params_fixup(sof_be, params);
 	} else {
-		list_for_each_entry(dai_link, &sof_priv->dai_link_list, list) {
+		list_for_each_entry(dai_link, &soc_card_data->sof_dai_link_list, list) {
 			if (strcmp(dai_link->name, rtd->dai_link->name) == 0) {
 				if (dai_link->be_hw_params_fixup)
 					ret = dai_link->be_hw_params_fixup(rtd, params);
@@ -144,7 +143,7 @@ int mtk_sof_card_late_probe(struct snd_soc_card *card)
 	struct snd_soc_component *sof_comp = NULL;
 	struct mtk_soc_card_data *soc_card_data =
 		snd_soc_card_get_drvdata(card);
-	struct mtk_sof_priv *sof_priv = soc_card_data->sof_priv;
+	const struct mtk_sof_priv *sof_priv = soc_card_data->sof_priv;
 	struct snd_soc_dai_link *dai_link;
 	struct mtk_dai_link *mtk_dai_link;
 	int i;
@@ -173,7 +172,7 @@ int mtk_sof_card_late_probe(struct snd_soc_card *card)
 			mtk_dai_link->be_hw_params_fixup = dai_link->be_hw_params_fixup;
 			mtk_dai_link->name = dai_link->name;
 
-			list_add(&mtk_dai_link->list, &sof_priv->dai_link_list);
+			list_add(&mtk_dai_link->list, &soc_card_data->sof_dai_link_list);
 		}
 
 		if (dai_link->no_pcm)

sound/soc/mediatek/common/mtk-dsp-sof-common.h

@@ -30,7 +30,6 @@ struct mtk_sof_priv {
 	int num_streams;
 	int (*sof_dai_link_fixup)(struct snd_soc_pcm_runtime *rtd,
 				  struct snd_pcm_hw_params *params);
-	struct list_head dai_link_list;
 };
 
 int mtk_sof_dai_link_fixup(struct snd_soc_pcm_runtime *rtd,

sound/soc/mediatek/common/mtk-soc-card.h

@@ -13,7 +13,7 @@ struct mtk_platform_card_data;
 struct mtk_sof_priv;
 
 struct mtk_soc_card_data {
-	struct mtk_sof_priv *sof_priv;
+	const struct mtk_sof_priv *sof_priv;
 	struct list_head sof_dai_link_list;
 	struct mtk_platform_card_data *card_data;
 	void *mach_priv;

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

@@ -22,7 +22,7 @@ struct mtk_platform_card_data {
 struct mtk_soundcard_pdata {
 	const char *card_name;
 	struct mtk_platform_card_data *card_data;
-	struct mtk_sof_priv *sof_priv;
+	const struct mtk_sof_priv *sof_priv;
 	int (*soc_probe)(struct mtk_soc_card_data *card_data, bool legacy);
 };