ASoC: audio-graph-card2.c: make Codec2Codec settings optional

Merge series from Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>:

Audio Graph Card2 has Codec2Codec support, but I noticed
 - Current Codec2Codec setting value is not correct
   because it is using of_get_property().
 - simple-card-utils has default Codec2Codec settings
   and it is overwriting Card2 settings
 - This default settings works for non Codec2Codec case
   (= DPCM::BE case) too.

This patch-set solve these issues.

3 files changed, 126 insertions, 40 deletions

diff --git a/sound/soc/generic/audio-graph-card2-custom-sample.dtsi b/sound/soc/generic/audio-graph-card2-custom-sample.dtsi
index 8eee7b821ff7..fe547c18771f 100644
--- a/sound/soc/generic/audio-graph-card2-custom-sample.dtsi
+++ b/sound/soc/generic/audio-graph-card2-custom-sample.dtsi
@@ -17,6 +17,23 @@
  *	CONFIG_SND_AUDIO_GRAPH_CARD2
  *	CONFIG_SND_AUDIO_GRAPH_CARD2_CUSTOM_SAMPLE
  *	CONFIG_SND_TEST_COMPONENT
+ *
+ *
+ * You can indicate more detail each device behavior as debug if you modify
+ * "compatible" on each test-component. see below
+ *
+ *	test_cpu {
+ *	-	compatible = "test-cpu";
+ *	+	compatible = "test-cpu-verbose";
+ *		...
+ *	};
+ *
+ *	test_codec {
+ *	-	compatible = "test-codec";
+ *	+	compatible = "test-codec-verbose";
+ *		...
+ *	};
+ *
  */
 / {
 	/*
@@ -101,35 +118,74 @@
 			  "TC OUT",		"TC DAI11 Playback",
 			  "TC DAI9 Capture",	"TC IN";
 
-		links = <&cpu0			/* normal: cpu side only */
-			 &mcpu0			/* multi:  cpu side only */
-			 &fe00 &fe01 &be0	/* dpcm:   both FE / BE  */
-			 &fe10 &fe11 &be1	/* dpcm-m: both FE / BE  */
-			 &c2c			/* c2c:    cpu side only */
-			 &c2c_m			/* c2c:    cpu side only */
+		links = <
+			/*
+			 * [Normal]: cpu side only
+			 * cpu0/codec0
+			 */
+			 &cpu0
+
+			/*
+			 * [Multi-CPU/Codec]: cpu side only
+			 * cpu1/cpu2/codec1/codec2
+			 */
+			 &mcpu0
+
+			/*
+			 * [DPCM]: both FE / BE
+			 * cpu3/cpu4/codec3
+			 */
+			 &fe00 &fe01 &be0
+
+			/*
+			 * [DPCM-Multi]: both FE / BE
+			 * cpu5/cpu6/codec4/codec5
+			 */
+			 &fe10 &fe11 &be1
+
+			/*
+			 * [Codec2Codec]: cpu side only
+			 * codec6/codec7
+			 */
+			 &c2c
+
+			/*
+			 * [Codec2Codec-Multi]: cpu side only
+			 * codec8/codec9/codec10/codec11
+			 */
+			 &c2c_m
 		>;
 
 		multi {
 			ports@0 {
+			/* [Multi-CPU] */
 			mcpu0:	port@0 { mcpu0_ep: endpoint { remote-endpoint = <&mcodec0_ep>; }; };
 				port@1 { mcpu1_ep: endpoint { remote-endpoint = <&cpu1_ep>;    }; };
 				port@2 { mcpu2_ep: endpoint { remote-endpoint = <&cpu2_ep>;    }; };
 			};
+
+			/* [Multi-Codec] */
 			ports@1 {
 				port@0 { mcodec0_ep: endpoint { remote-endpoint = <&mcpu0_ep>;  }; };
 				port@1 { mcodec1_ep: endpoint { remote-endpoint = <&codec1_ep>; }; };
 				port@2 { mcodec2_ep: endpoint { remote-endpoint = <&codec2_ep>; }; };
 			};
+
+			/* [DPCM-Multi]::BE */
 			ports@2 {
 				port@0 { mbe_ep:  endpoint { remote-endpoint = <&be10_ep>;  }; };
 				port@1 { mbe1_ep: endpoint { remote-endpoint = <&codec4_ep>; }; };
 				port@2 { mbe2_ep: endpoint { remote-endpoint = <&codec5_ep>; }; };
 			};
+
+			/* [Codec2Codec-Multi]::CPU */
 			ports@3 {
 				port@0 { mc2c0_ep:  endpoint { remote-endpoint = <&c2cmf_ep>;  }; };
 				port@1 { mc2c00_ep: endpoint { remote-endpoint = <&codec8_ep>; }; };
 				port@2 { mc2c01_ep: endpoint { remote-endpoint = <&codec9_ep>; }; };
 			};
+
+			/* [Codec2Codec-Multi]::Codec */
 			ports@4 {
 				port@0 { mc2c1_ep:  endpoint { remote-endpoint = <&c2cmb_ep>;  }; };
 				port@1 { mc2c10_ep: endpoint { remote-endpoint = <&codec10_ep>; }; };
@@ -138,27 +194,36 @@
 		};
 
 		dpcm {
-			/* FE */
 			ports@0 {
+			/* [DPCM]::FE */
 			fe00:	port@0 { fe00_ep: endpoint { remote-endpoint = <&cpu3_ep>; }; };
 			fe01:	port@1 { fe01_ep: endpoint { remote-endpoint = <&cpu4_ep>; }; };
+
+			/* [DPCM-Multi]::FE */
 			fe10:	port@2 { fe10_ep: endpoint { remote-endpoint = <&cpu5_ep>; }; };
 			fe11:	port@3 { fe11_ep: endpoint { remote-endpoint = <&cpu6_ep>; }; };
 			};
-			/* BE */
+
 			ports@1 {
+			/* [DPCM]::BE */
 			be0:	port@0 { be00_ep: endpoint { remote-endpoint = <&codec3_ep>; }; };
+
+			/* [DPCM-Multi]::BE */
 			be1:	port@1 { be10_ep: endpoint { remote-endpoint = <&mbe_ep>; }; };
 			};
 		};
 
 		codec2codec {
+			/* [Codec2Codec] */
 			ports@0 {
-				rate = <48000>;
+				/* use default settings */
 			c2c:	port@0 { c2cf_ep: endpoint { remote-endpoint = <&codec6_ep>; }; };
 				port@1 { c2cb_ep: endpoint { remote-endpoint = <&codec7_ep>; }; };
 			};
+
+			/* [Codec2Codec-Multi] */
 			ports@1 {
+				/* use original settings */
 				rate = <48000>;
 			c2c_m:	port@0 { c2cmf_ep: endpoint { remote-endpoint = <&mc2c0_ep>; }; };
 				port@1 { c2cmb_ep: endpoint { remote-endpoint = <&mc2c1_ep>; }; };
@@ -179,11 +244,18 @@
 		ports {
 			bitclock-master;
 			frame-master;
+			/* [Normal] */
 			cpu0: port@0 { cpu0_ep: endpoint { remote-endpoint = <&codec0_ep>; }; };
+
+			/* [Multi-CPU] */
 			      port@1 { cpu1_ep: endpoint { remote-endpoint = <&mcpu1_ep>; }; };
 			      port@2 { cpu2_ep: endpoint { remote-endpoint = <&mcpu2_ep>; }; };
+
+			/* [DPCM]::FE */
 			      port@3 { cpu3_ep: endpoint { remote-endpoint = <&fe00_ep>; }; };
 			      port@4 { cpu4_ep: endpoint { remote-endpoint = <&fe01_ep>; }; };
+
+			/* [DPCM-Multi]::FE */
 			      port@5 { cpu5_ep: endpoint { remote-endpoint = <&fe10_ep>; }; };
 			      port@6 { cpu6_ep: endpoint { remote-endpoint = <&fe11_ep>; }; };
 		};
@@ -206,16 +278,27 @@
 			 */
 			prefix = "TC";
 
+			/* [Normal] */
 			port@0  { codec0_ep:  endpoint { remote-endpoint = <&cpu0_ep>; }; };
+
+			/* [Multi-Codec] */
 			port@1  { codec1_ep:  endpoint { remote-endpoint = <&mcodec1_ep>; }; };
 			port@2  { codec2_ep:  endpoint { remote-endpoint = <&mcodec2_ep>; }; };
+
+			/* [DPCM]::BE */
 			port@3  { codec3_ep:  endpoint { remote-endpoint = <&be00_ep>; }; };
+
+			/* [DPCM-Multi]::BE */
 			port@4  { codec4_ep:  endpoint { remote-endpoint = <&mbe1_ep>; }; };
 			port@5  { codec5_ep:  endpoint { remote-endpoint = <&mbe2_ep>; }; };
+
+			/* [Codec2Codec] */
 			port@6  { bitclock-master;
 				  frame-master;
 				  codec6_ep:  endpoint { remote-endpoint = <&c2cf_ep>; }; };
 			port@7  { codec7_ep:  endpoint { remote-endpoint = <&c2cb_ep>; }; };
+
+			/* [Codec2Codec-Multi] */
 			port@8  { bitclock-master;
 				  frame-master;
 				  codec8_ep:  endpoint { remote-endpoint = <&mc2c00_ep>; }; };
diff --git a/sound/soc/generic/audio-graph-card2.c b/sound/soc/generic/audio-graph-card2.c
index d34b29a49268..19e31d53422a 100644
--- a/sound/soc/generic/audio-graph-card2.c
+++ b/sound/soc/generic/audio-graph-card2.c
@@ -851,12 +851,10 @@ int audio_graph2_link_c2c(struct asoc_simple_priv *priv,
 			  struct link_info *li)
 {
 	struct snd_soc_dai_link *dai_link = simple_priv_to_link(priv, li->link);
-	struct simple_dai_props *dai_props = simple_priv_to_props(priv, li->link);
-	struct snd_soc_pcm_stream *c2c_conf = dai_props->c2c_conf;
 	struct device_node *port0, *port1, *ports;
 	struct device_node *codec0_port, *codec1_port;
 	struct device_node *ep0, *ep1;
-	u32 val;
+	u32 val = 0;
 	int ret = -EINVAL;
 
 	/*
@@ -880,19 +878,33 @@ int audio_graph2_link_c2c(struct asoc_simple_priv *priv,
 	ports = of_get_parent(port0);
 	port1 = of_get_next_child(ports, lnk);
 
-	if (!of_get_property(ports, "rate", &val)) {
+	/*
+	 * Card2 can use original Codec2Codec settings if DT has.
+	 * It will use default settings if no settings on DT.
+	 * see
+	 *	asoc_simple_init_for_codec2codec()
+	 *
+	 * Add more settings here if needed
+	 */
+	of_property_read_u32(ports, "rate", &val);
+	if (val) {
 		struct device *dev = simple_priv_to_dev(priv);
+		struct snd_soc_pcm_stream *c2c_conf;
 
-		dev_err(dev, "Codec2Codec needs rate settings\n");
-		goto err1;
-	}
+		c2c_conf = devm_kzalloc(dev, sizeof(*c2c_conf), GFP_KERNEL);
+		if (!c2c_conf)
+			goto err1;
 
-	c2c_conf->formats	= SNDRV_PCM_FMTBIT_S32_LE; /* update ME */
-	c2c_conf->rate_min	=
-	c2c_conf->rate_max	= val;
-	c2c_conf->channels_min	=
-	c2c_conf->channels_max	= 2; /* update ME */
-	dai_link->params	= c2c_conf;
+		c2c_conf->formats	= SNDRV_PCM_FMTBIT_S32_LE; /* update ME */
+		c2c_conf->rates		= SNDRV_PCM_RATE_8000_384000;
+		c2c_conf->rate_min	=
+		c2c_conf->rate_max	= val;
+		c2c_conf->channels_min	=
+		c2c_conf->channels_max	= 2; /* update ME */
+
+		dai_link->params	= c2c_conf;
+		dai_link->num_params	= 1;
+	}
 
 	ep0 = port_to_endpoint(port0);
 	ep1 = port_to_endpoint(port1);
@@ -1086,7 +1098,6 @@ static int graph_count_c2c(struct asoc_simple_priv *priv,
 	li->num[li->link].cpus		=
 	li->num[li->link].platforms	= graph_counter(codec0);
 	li->num[li->link].codecs	= graph_counter(codec1);
-	li->num[li->link].c2c		= 1;
 
 	of_node_put(ports);
 	of_node_put(port1);
diff --git a/sound/soc/generic/simple-card-utils.c b/sound/soc/generic/simple-card-utils.c
index 7be84c7840cb..4a29e314fa95 100644
--- a/sound/soc/generic/simple-card-utils.c
+++ b/sound/soc/generic/simple-card-utils.c
@@ -527,6 +527,14 @@ static int asoc_simple_init_for_codec2codec(struct snd_soc_pcm_runtime *rtd,
 	struct snd_pcm_hardware hw;
 	int i, ret, stream;
 
+	/* Do nothing if it already has Codec2Codec settings */
+	if (dai_link->params)
+		return 0;
+
+	/* Do nothing if it was DPCM :: BE */
+	if (dai_link->no_pcm)
+		return 0;
+
 	/* Only Codecs */
 	for_each_rtd_components(rtd, i, component) {
 		if (!asoc_simple_component_is_codec(component))
@@ -746,8 +754,7 @@ int asoc_simple_init_priv(struct asoc_simple_priv *priv,
 	struct asoc_simple_dai *dais;
 	struct snd_soc_dai_link_component *dlcs;
 	struct snd_soc_codec_conf *cconf = NULL;
-	struct snd_soc_pcm_stream *c2c_conf = NULL;
-	int i, dai_num = 0, dlc_num = 0, cnf_num = 0, c2c_num = 0;
+	int i, dai_num = 0, dlc_num = 0, cnf_num = 0;
 
 	dai_props = devm_kcalloc(dev, li->link, sizeof(*dai_props), GFP_KERNEL);
 	dai_link  = devm_kcalloc(dev, li->link, sizeof(*dai_link),  GFP_KERNEL);
@@ -766,8 +773,6 @@ int asoc_simple_init_priv(struct asoc_simple_priv *priv,
 
 		if (!li->num[i].cpus)
 			cnf_num += li->num[i].codecs;
-
-		c2c_num += li->num[i].c2c;
 	}
 
 	dais = devm_kcalloc(dev, dai_num, sizeof(*dais), GFP_KERNEL);
@@ -781,12 +786,6 @@ int asoc_simple_init_priv(struct asoc_simple_priv *priv,
 			return -ENOMEM;
 	}
 
-	if (c2c_num) {
-		c2c_conf = devm_kcalloc(dev, c2c_num, sizeof(*c2c_conf), GFP_KERNEL);
-		if (!c2c_conf)
-			return -ENOMEM;
-	}
-
 	dev_dbg(dev, "link %d, dais %d, ccnf %d\n",
 		li->link, dai_num, cnf_num);
 
@@ -800,7 +799,6 @@ int asoc_simple_init_priv(struct asoc_simple_priv *priv,
 	priv->dais		= dais;
 	priv->dlcs		= dlcs;
 	priv->codec_conf	= cconf;
-	priv->c2c_conf		= c2c_conf;
 
 	card->dai_link		= priv->dai_link;
 	card->num_links		= li->link;
@@ -818,12 +816,6 @@ int asoc_simple_init_priv(struct asoc_simple_priv *priv,
 
 			dlcs += li->num[i].cpus;
 			dais += li->num[i].cpus;
-
-			if (li->num[i].c2c) {
-				/* Codec2Codec */
-				dai_props[i].c2c_conf = c2c_conf;
-				c2c_conf += li->num[i].c2c;
-			}
 		} else {
 			/* DPCM Be's CPU = dummy */
 			dai_props[i].cpus	=