ASoC: don't use original dummy dlc

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

"Empty" dlc might be used on Platform, but "dummy" dlc is not needed
for it. [PATCH 1/5][PATCH 2/5] removes "dummy" dlc from Platform.

Now ASoC have common dummy dlc (= snd_soc_dummy_dlc).
[PATCH 3/5][PATCH 4/5] will use it instead of original dummy dlc.

Many drivers are using below macro

	SND_SOC_DAILINK_DEFS(link,
		     DAILINK_COMP_ARRAY(COMP_CPU(...)),
(X)		     DAILINK_COMP_ARRAY(COMP_DUMMY()),
		     DAILINK_COMP_ARRAY(COMP_EMPTY()));

But (X) part will create original dummy dlc.
[PATCH 5/5] will try not to create original dummy dlc, and replace
it to common dummy dlc.

include/sound/soc.h

@@ -938,7 +938,7 @@ snd_soc_link_to_platform(struct snd_soc_dai_link *link, int n) {
 #define COMP_PLATFORM(_name)		{ .name = _name }
 #define COMP_AUX(_name)			{ .name = _name }
 #define COMP_CODEC_CONF(_name)		{ .name = _name }
-#define COMP_DUMMY()			{ .name = "snd-soc-dummy", .dai_name = "snd-soc-dummy-dai", }
+#define COMP_DUMMY()			/* see snd_soc_fill_dummy_dai() */
 
 extern struct snd_soc_dai_link_component null_dailink_component[0];
 extern struct snd_soc_dai_link_component snd_soc_dummy_dlc;

sound/soc/fsl/fsl-asoc-card.c

@@ -305,8 +305,7 @@ SND_SOC_DAILINK_DEFS(hifi_fe,
 
 SND_SOC_DAILINK_DEFS(hifi_be,
 	DAILINK_COMP_ARRAY(COMP_EMPTY()),
-	DAILINK_COMP_ARRAY(COMP_EMPTY()),
-	DAILINK_COMP_ARRAY(COMP_DUMMY()));
+	DAILINK_COMP_ARRAY(COMP_EMPTY()));
 
 static const struct snd_soc_dai_link fsl_asoc_card_dai[] = {
 	/* Default ASoC DAI Link*/

sound/soc/intel/avs/boards/hdaudio.c

@@ -155,8 +155,6 @@ static int avs_probing_link_init(struct snd_soc_pcm_runtime *rtm)
 	return 0;
 }
 
-SND_SOC_DAILINK_DEF(dummy, DAILINK_COMP_ARRAY(COMP_DUMMY()));
-
 static struct snd_soc_dai_link probing_link = {
 	.name = "probing-LINK",
 	.id = -1,
@@ -164,8 +162,8 @@ static struct snd_soc_dai_link probing_link = {
 	.no_pcm = 1,
 	.dpcm_playback = 1,
 	.dpcm_capture = 1,
-	.cpus = dummy,
-	.num_cpus = ARRAY_SIZE(dummy),
+	.cpus = &snd_soc_dummy_dlc,
+	.num_cpus = 1,
 	.init = avs_probing_link_init,
 };
 

sound/soc/samsung/odroid.c

@@ -157,8 +157,7 @@ SND_SOC_DAILINK_DEFS(primary,
 
 SND_SOC_DAILINK_DEFS(mixer,
 	DAILINK_COMP_ARRAY(COMP_DUMMY()),
-	DAILINK_COMP_ARRAY(COMP_EMPTY()),
-	DAILINK_COMP_ARRAY(COMP_DUMMY()));
+	DAILINK_COMP_ARRAY(COMP_EMPTY()));
 
 SND_SOC_DAILINK_DEFS(secondary,
 	DAILINK_COMP_ARRAY(COMP_EMPTY()),

sound/soc/soc-core.c

@@ -576,6 +576,28 @@ static struct snd_soc_pcm_runtime *soc_new_pcm_runtime(
 	return NULL;
 }
 
+static void snd_soc_fill_dummy_dai(struct snd_soc_card *card)
+{
+	struct snd_soc_dai_link *dai_link;
+	int i;
+
+	/*
+	 * COMP_DUMMY() creates size 0 array on dai_link.
+	 * Fill it as dummy DAI in case of CPU/Codec here.
+	 * Do nothing for Platform.
+	 */
+	for_each_card_prelinks(card, i, dai_link) {
+		if (dai_link->num_cpus == 0 && dai_link->cpus) {
+			dai_link->num_cpus	= 1;
+			dai_link->cpus		= &snd_soc_dummy_dlc;
+		}
+		if (dai_link->num_codecs == 0 && dai_link->codecs) {
+			dai_link->num_codecs	= 1;
+			dai_link->codecs	= &snd_soc_dummy_dlc;
+		}
+	}
+}
+
 static void snd_soc_flush_all_delayed_work(struct snd_soc_card *card)
 {
 	struct snd_soc_pcm_runtime *rtd;
@@ -2131,6 +2153,8 @@ static int snd_soc_bind_card(struct snd_soc_card *card)
 	mutex_lock(&client_mutex);
 	snd_soc_card_mutex_lock_root(card);
 
+	snd_soc_fill_dummy_dai(card);
+
 	snd_soc_dapm_init(&card->dapm, card, NULL);
 
 	/* check whether any platform is ignore machine FE and using topology */

sound/soc/sof/sof-client-probes.c

@@ -381,8 +381,6 @@ static const struct snd_soc_component_driver sof_probes_component = {
 	.legacy_dai_naming = 1,
 };
 
-SND_SOC_DAILINK_DEF(dummy, DAILINK_COMP_ARRAY(COMP_DUMMY()));
-
 static int sof_probes_client_probe(struct auxiliary_device *auxdev,
 				   const struct auxiliary_device_id *id)
 {
@@ -475,7 +473,7 @@ static int sof_probes_client_probe(struct auxiliary_device *auxdev,
 	links[0].cpus = &cpus[0];
 	links[0].num_cpus = 1;
 	links[0].cpus->dai_name = "Probe Extraction CPU DAI";
-	links[0].codecs = dummy;
+	links[0].codecs = &snd_soc_dummy_dlc;
 	links[0].num_codecs = 1;
 	links[0].platforms = platform_component;
 	links[0].num_platforms = ARRAY_SIZE(platform_component);