ASoC: core - Allow components to probe/remove in sequence.

Some ASoC components depend on other ASoC components to provide clocks and
power resources in order to probe() and vice versa for remove().

Allow components to be ordered so that components can be probed() and removed()
in sequences that conform to their dependencies.

Signed-off-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 39 insertions, 21 deletions

diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index 29bf9fbd3e2..df5608db335 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -1394,7 +1394,7 @@ static void soc_remove_codec(struct snd_soc_codec *codec)
 	module_put(codec->dev->driver->owner);
 }
 
-static void soc_remove_dai_link(struct snd_soc_card *card, int num)
+static void soc_remove_dai_link(struct snd_soc_card *card, int num, int order)
 {
 	struct snd_soc_pcm_runtime *rtd = &card->rtd[num];
 	struct snd_soc_codec *codec = rtd->codec;
@@ -1411,7 +1411,8 @@ static void soc_remove_dai_link(struct snd_soc_card *card, int num)
 	}
 
 	/* remove the CODEC DAI */
-	if (codec_dai && codec_dai->probed) {
+	if (codec_dai && codec_dai->probed &&
+			codec_dai->driver->remove_order == order) {
 		if (codec_dai->driver->remove) {
 			err = codec_dai->driver->remove(codec_dai);
 			if (err < 0)
@@ -1422,7 +1423,8 @@ static void soc_remove_dai_link(struct snd_soc_card *card, int num)
 	}
 
 	/* remove the platform */
-	if (platform && platform->probed) {
+	if (platform && platform->probed &&
+			platform->driver->remove_order == order) {
 		if (platform->driver->remove) {
 			err = platform->driver->remove(platform);
 			if (err < 0)
@@ -1434,11 +1436,13 @@ static void soc_remove_dai_link(struct snd_soc_card *card, int num)
 	}
 
 	/* remove the CODEC */
-	if (codec && codec->probed)
+	if (codec && codec->probed &&
+			codec->driver->remove_order == order)
 		soc_remove_codec(codec);
 
 	/* remove the cpu_dai */
-	if (cpu_dai && cpu_dai->probed) {
+	if (cpu_dai && cpu_dai->probed &&
+			cpu_dai->driver->remove_order == order) {
 		if (cpu_dai->driver->remove) {
 			err = cpu_dai->driver->remove(cpu_dai);
 			if (err < 0)
@@ -1452,11 +1456,13 @@ static void soc_remove_dai_link(struct snd_soc_card *card, int num)
 
 static void soc_remove_dai_links(struct snd_soc_card *card)
 {
-	int i;
-
-	for (i = 0; i < card->num_rtd; i++)
-		soc_remove_dai_link(card, i);
+	int dai, order;
 
+	for (order = SND_SOC_COMP_ORDER_FIRST; order <= SND_SOC_COMP_ORDER_LAST;
+			order++) {
+		for (dai = 0; dai < card->num_rtd; dai++)
+			soc_remove_dai_link(card, dai, order);
+	}
 	card->num_rtd = 0;
 }
 
@@ -1597,7 +1603,7 @@ static int soc_post_component_init(struct snd_soc_card *card,
 	return 0;
 }
 
-static int soc_probe_dai_link(struct snd_soc_card *card, int num)
+static int soc_probe_dai_link(struct snd_soc_card *card, int num, int order)
 {
 	struct snd_soc_dai_link *dai_link = &card->dai_link[num];
 	struct snd_soc_pcm_runtime *rtd = &card->rtd[num];
@@ -1606,7 +1612,8 @@ static int soc_probe_dai_link(struct snd_soc_card *card, int num)
 	struct snd_soc_dai *codec_dai = rtd->codec_dai, *cpu_dai = rtd->cpu_dai;
 	int ret;
 
-	dev_dbg(card->dev, "probe %s dai link %d\n", card->name, num);
+	dev_dbg(card->dev, "probe %s dai link %d late %d\n",
+			card->name, num, order);
 
 	/* config components */
 	codec_dai->codec = codec;
@@ -1618,7 +1625,8 @@ static int soc_probe_dai_link(struct snd_soc_card *card, int num)
 	rtd->pmdown_time = pmdown_time;
 
 	/* probe the cpu_dai */
-	if (!cpu_dai->probed) {
+	if (!cpu_dai->probed &&
+			cpu_dai->driver->probe_order == order) {
 		if (!try_module_get(cpu_dai->dev->driver->owner))
 			return -ENODEV;
 
@@ -1637,14 +1645,16 @@ static int soc_probe_dai_link(struct snd_soc_card *card, int num)
 	}
 
 	/* probe the CODEC */
-	if (!codec->probed) {
+	if (!codec->probed &&
+			codec->driver->probe_order == order) {
 		ret = soc_probe_codec(card, codec);
 		if (ret < 0)
 			return ret;
 	}
 
 	/* probe the platform */
-	if (!platform->probed) {
+	if (!platform->probed &&
+			platform->driver->probe_order == order) {
 		if (!try_module_get(platform->dev->driver->owner))
 			return -ENODEV;
 
@@ -1663,7 +1673,7 @@ static int soc_probe_dai_link(struct snd_soc_card *card, int num)
 	}
 
 	/* probe the CODEC DAI */
-	if (!codec_dai->probed) {
+	if (!codec_dai->probed && codec_dai->driver->probe_order == order) {
 		if (codec_dai->driver->probe) {
 			ret = codec_dai->driver->probe(codec_dai);
 			if (ret < 0) {
@@ -1678,6 +1688,10 @@ static int soc_probe_dai_link(struct snd_soc_card *card, int num)
 		list_add(&codec_dai->card_list, &card->dai_dev_list);
 	}
 
+	/* complete DAI probe during last probe */
+	if (order != SND_SOC_COMP_ORDER_LAST)
+		return 0;
+
 	/* DAPM dai link stream work */
 	INIT_DELAYED_WORK(&rtd->delayed_work, close_delayed_work);
 
@@ -1818,7 +1832,7 @@ static void snd_soc_instantiate_card(struct snd_soc_card *card)
 	struct snd_soc_codec *codec;
 	struct snd_soc_codec_conf *codec_conf;
 	enum snd_soc_compress_type compress_type;
-	int ret, i;
+	int ret, i, order;
 
 	mutex_lock(&card->mutex);
 
@@ -1896,12 +1910,16 @@ static void snd_soc_instantiate_card(struct snd_soc_card *card)
 			goto card_probe_error;
 	}
 
-	for (i = 0; i < card->num_links; i++) {
-		ret = soc_probe_dai_link(card, i);
-		if (ret < 0) {
-			pr_err("asoc: failed to instantiate card %s: %d\n",
+	/* early DAI link probe */
+	for (order = SND_SOC_COMP_ORDER_FIRST; order <= SND_SOC_COMP_ORDER_LAST;
+			order++) {
+		for (i = 0; i < card->num_links; i++) {
+			ret = soc_probe_dai_link(card, i, order);
+			if (ret < 0) {
+				pr_err("asoc: failed to instantiate card %s: %d\n",
 			       card->name, ret);
-			goto probe_dai_err;
+				goto probe_dai_err;
+			}
 		}
 	}