ASoC: rsnd: judge multi SSI in runtime

Current rsnd supports multi SSI (maximum 4 SSI for 8ch),
and, it should determine whether using each SSI or not in runtime.
Current judgement is vague, and had broken by
c308abe4("ASoC: rsnd: rsnd_ssi_is_multi_slave() macro uses
rsnd_ssi_multi_slaves()")
This patch makes clean it, and solve this issue.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sh/rcar/core.c

@@ -230,7 +230,7 @@ int rsnd_get_slot_width(struct rsnd_dai_stream *io)
 	int chan = runtime->channels;
 
 	/* Multi channel Mode */
-	if (rsnd_ssi_multi_slaves(io))
+	if (rsnd_ssi_multi_slaves_runtime(io))
 		chan /= rsnd_get_slot_num(io);
 
 	/* TDM Extend Mode needs 8ch */

sound/soc/sh/rcar/rsnd.h

@@ -599,7 +599,7 @@ void rsnd_ssi_remove(struct rsnd_priv *priv);
 struct rsnd_mod *rsnd_ssi_mod_get(struct rsnd_priv *priv, int id);
 int rsnd_ssi_is_dma_mode(struct rsnd_mod *mod);
 int rsnd_ssi_use_busif(struct rsnd_dai_stream *io);
-u32 rsnd_ssi_multi_slaves(struct rsnd_dai_stream *io);
+u32 rsnd_ssi_multi_slaves_runtime(struct rsnd_dai_stream *io);
 
 #define rsnd_ssi_is_pin_sharing(io)	\
 	__rsnd_ssi_is_pin_sharing(rsnd_io_to_mod_ssi(io))

sound/soc/sh/rcar/ssi.c

@@ -144,7 +144,7 @@ static void rsnd_ssi_status_check(struct rsnd_mod *mod,
 		 rsnd_mod_name(mod), rsnd_mod_id(mod));
 }
 
-u32 rsnd_ssi_multi_slaves(struct rsnd_dai_stream *io)
+static u32 rsnd_ssi_multi_slaves(struct rsnd_dai_stream *io)
 {
 	struct rsnd_mod *mod;
 	enum rsnd_mod_type types[] = {
@@ -166,6 +166,17 @@ u32 rsnd_ssi_multi_slaves(struct rsnd_dai_stream *io)
 	return mask;
 }
 
+u32 rsnd_ssi_multi_slaves_runtime(struct rsnd_dai_stream *io)
+{
+	struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io);
+	u32 mask = rsnd_ssi_multi_slaves(io);
+
+	if (mask && (runtime->channels >= 6))
+		return mask;
+
+	return 0;
+}
+
 static int rsnd_ssi_master_clk_start(struct rsnd_mod *mod,
 				     struct rsnd_dai_stream *io)
 {
@@ -415,7 +426,7 @@ static int rsnd_ssi_start(struct rsnd_mod *mod,
 	 * EN will be set via SSIU :: SSI_CONTROL
 	 * if Multi channel mode
 	 */
-	if (rsnd_ssi_multi_slaves(io))
+	if (rsnd_ssi_multi_slaves_runtime(io))
 		return 0;
 
 	rsnd_mod_bset(mod, SSICR, EN, EN);

sound/soc/sh/rcar/ssiu.c

@@ -27,7 +27,7 @@ static int rsnd_ssiu_init(struct rsnd_mod *mod,
 			  struct rsnd_priv *priv)
 {
 	struct rsnd_dai *rdai = rsnd_io_to_rdai(io);
-	u32 multi_ssi_slaves = rsnd_ssi_multi_slaves(io);
+	u32 multi_ssi_slaves = rsnd_ssi_multi_slaves_runtime(io);
 	int use_busif = rsnd_ssi_use_busif(io);
 	int id = rsnd_mod_id(mod);
 	u32 mask1, val1;
@@ -136,7 +136,7 @@ static int rsnd_ssiu_start_gen2(struct rsnd_mod *mod,
 
 	rsnd_mod_write(mod, SSI_CTRL, 0x1);
 
-	if (rsnd_ssi_multi_slaves(io))
+	if (rsnd_ssi_multi_slaves_runtime(io))
 		rsnd_mod_write(mod, SSI_CONTROL, 0x1);
 
 	return 0;
@@ -151,7 +151,7 @@ static int rsnd_ssiu_stop_gen2(struct rsnd_mod *mod,
 
 	rsnd_mod_write(mod, SSI_CTRL, 0);
 
-	if (rsnd_ssi_multi_slaves(io))
+	if (rsnd_ssi_multi_slaves_runtime(io))
 		rsnd_mod_write(mod, SSI_CONTROL, 0);
 
 	return 0;