ASoC: audio-graph-card: cleanup DAI link loop method - step2

Current audio-graph-card is parsing DAI link for both "normal sound" and
"DPCM sound". On this driver, it needs to count and parse
DAIs/Links/Codec Conf from each links.
Then, counting/parsing link loop are very similar, but using different
implementation. Because of this background, the link loop code is very
mysterious. Mystery code will be trouble in the future.

This patch cleanups the code by using asoc_graph_card_for_each_link()
which judges normal link / DPCM link.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/generic/audio-graph-card.c

@@ -425,86 +425,107 @@ static int asoc_graph_card_dai_link_of(struct graph_card_data *priv,
 	return 0;
 }
 
-static int asoc_graph_card_parse_of(struct graph_card_data *priv)
+static int asoc_graph_card_for_each_link(struct graph_card_data *priv,
+			struct link_info *li,
+			int (*func_noml)(struct graph_card_data *priv,
+					 struct device_node *cpu_ep,
+					 struct device_node *codec_ep,
+					 struct link_info *li),
+			int (*func_dpcm)(struct graph_card_data *priv,
+					 struct device_node *cpu_ep,
+					 struct device_node *codec_ep,
+					 struct link_info *li, int dup_codec))
 {
 	struct of_phandle_iterator it;
 	struct device *dev = graph_priv_to_dev(priv);
-	struct snd_soc_card *card = graph_priv_to_card(priv);
-	struct device_node *top = dev->of_node;
-	struct device_node *node = top;
+	struct device_node *node = dev->of_node;
 	struct device_node *cpu_port;
-	struct device_node *cpu_ep		= NULL;
-	struct device_node *codec_ep		= NULL;
-	struct device_node *codec_port		= NULL;
+	struct device_node *cpu_ep;
+	struct device_node *codec_ep;
+	struct device_node *codec_port;
 	struct device_node *codec_port_old = NULL;
 	struct asoc_simple_card_data adata;
-	struct link_info li;
 	int rc, ret;
 
-	ret = asoc_simple_card_of_parse_widgets(card, NULL);
-	if (ret < 0)
-		return ret;
-
-	ret = asoc_simple_card_of_parse_routing(card, NULL);
-	if (ret < 0)
-		return ret;
-
-	memset(&li, 0, sizeof(li));
-	codec_port_old	= NULL;
-	for (li.cpu = 1; li.cpu >= 0; li.cpu--) {
-		/*
-		 * Detect all CPU first, and Detect all Codec 2nd.
-		 *
-		 * In Normal sound case, all DAIs are detected
-		 * as "CPU-Codec".
-		 *
-		 * In DPCM sound case,
-		 * all CPUs   are detected as "CPU-dummy", and
-		 * all Codecs are detected as "dummy-Codec".
-		 * To avoid random sub-device numbering,
-		 * detect "dummy-Codec" in last;
-		 */
+	/* loop for all listed CPU port */
 	of_for_each_phandle(&it, rc, node, "dais", NULL, 0) {
 		cpu_port = it.node;
 		cpu_ep	 = NULL;
+
+		/* loop for all CPU endpoint */
 		while (1) {
 			cpu_ep = of_get_next_child(cpu_port, cpu_ep);
 			if (!cpu_ep)
 				break;
 
+			/* get codec */
 			codec_ep = of_graph_get_remote_endpoint(cpu_ep);
 			codec_port = of_get_parent(codec_ep);
 
 			of_node_put(codec_ep);
 			of_node_put(codec_port);
 
-				dev_dbg(dev, "%pOFf <-> %pOFf\n", cpu_ep, codec_ep);
-
+			/* get convert-xxx property */
 			memset(&adata, 0, sizeof(adata));
 			asoc_graph_card_get_conversion(dev, codec_ep, &adata);
 			asoc_graph_card_get_conversion(dev, cpu_ep,   &adata);
 
-				if ((of_get_child_count(codec_port) > 1) ||
-				    adata.convert_rate ||
-				    adata.convert_channels) {
 			/*
-					 * for DPCM sound
+			 * It is DPCM
+			 * if Codec port has many endpoints,
+			 * or has convert-xxx property
 			 */
-					ret = asoc_graph_card_dai_link_of_dpcm(
-						priv, cpu_ep, codec_ep, &li,
+			if ((of_get_child_count(codec_port) > 1) ||
+			    adata.convert_rate || adata.convert_channels)
+				ret = func_dpcm(priv, cpu_ep, codec_ep, li,
 						(codec_port_old == codec_port));
-				} else if (li.cpu) {
-					/*
-					 * for Normal sound
-					 */
-					ret = asoc_graph_card_dai_link_of(
-						priv, cpu_ep, codec_ep, &li);
-				}
+			/* else normal sound */
+			else
+				ret = func_noml(priv, cpu_ep, codec_ep, li);
+
 			if (ret < 0)
 				return ret;
+
 			codec_port_old = codec_port;
 		}
 	}
+
+	return 0;
+}
+
+static int asoc_graph_card_parse_of(struct graph_card_data *priv)
+{
+	struct snd_soc_card *card = graph_priv_to_card(priv);
+	struct link_info li;
+	int ret;
+
+	ret = asoc_simple_card_of_parse_widgets(card, NULL);
+	if (ret < 0)
+		return ret;
+
+	ret = asoc_simple_card_of_parse_routing(card, NULL);
+	if (ret < 0)
+		return ret;
+
+	memset(&li, 0, sizeof(li));
+	for (li.cpu = 1; li.cpu >= 0; li.cpu--) {
+		/*
+		 * Detect all CPU first, and Detect all Codec 2nd.
+		 *
+		 * In Normal sound case, all DAIs are detected
+		 * as "CPU-Codec".
+		 *
+		 * In DPCM sound case,
+		 * all CPUs   are detected as "CPU-dummy", and
+		 * all Codecs are detected as "dummy-Codec".
+		 * To avoid random sub-device numbering,
+		 * detect "dummy-Codec" in last;
+		 */
+		ret = asoc_graph_card_for_each_link(priv, &li,
+						    asoc_graph_card_dai_link_of,
+						    asoc_graph_card_dai_link_of_dpcm);
+		if (ret < 0)
+			return ret;
 	}
 
 	return asoc_simple_card_parse_card_name(card, NULL);
@@ -551,15 +572,6 @@ static void asoc_graph_get_dais_count(struct graph_card_data *priv,
 				      struct link_info *li)
 {
 	struct device *dev = graph_priv_to_dev(priv);
-	struct of_phandle_iterator it;
-	struct device_node *node = dev->of_node;
-	struct device_node *cpu_port;
-	struct device_node *cpu_ep;
-	struct device_node *codec_ep;
-	struct device_node *codec_port;
-	struct device_node *codec_port_old;
-	struct asoc_simple_card_data adata;
-	int rc;
 
 	/*
 	 * link_num :	number of links.
@@ -607,37 +619,11 @@ static void asoc_graph_get_dais_count(struct graph_card_data *priv,
 	 *	=> 4 DAIs  = 2xCPU + 2xCodec
 	 *	=> 1 ccnf  = 1xdummy-Codec
 	 */
-	codec_port_old = NULL;
-	of_for_each_phandle(&it, rc, node, "dais", NULL, 0) {
-		cpu_port = it.node;
-		cpu_ep	 = NULL;
-		while (1) {
-			cpu_ep = of_get_next_child(cpu_port, cpu_ep);
-			if (!cpu_ep)
-				break;
-
-			codec_ep = of_graph_get_remote_endpoint(cpu_ep);
-			codec_port = of_get_parent(codec_ep);
-
-			of_node_put(codec_ep);
-			of_node_put(codec_port);
-
-			memset(&adata, 0, sizeof(adata));
-			asoc_graph_card_get_conversion(dev, codec_ep, &adata);
-			asoc_graph_card_get_conversion(dev, cpu_ep,   &adata);
-
-			if ((of_get_child_count(codec_port) > 1) ||
-			    adata.convert_rate || adata.convert_channels) {
-				asoc_graph_card_count_dpcm(priv,
-						cpu_ep, codec_ep, li,
-						(codec_port_old == codec_port));
-			} else {
-				asoc_graph_card_count_noml(priv,
-						cpu_ep, codec_ep, li);
-			}
-			codec_port_old = codec_port;
-		}
-	}
+	asoc_graph_card_for_each_link(priv, li,
+				      asoc_graph_card_count_noml,
+				      asoc_graph_card_count_dpcm);
+	dev_dbg(dev, "link %d, dais %d, ccnf %d\n",
+		li->link, li->dais, li->conf);
 }
 
 static int asoc_graph_soc_card_probe(struct snd_soc_card *card)