ASoC: rsnd: judge work 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.
All SSIs are not used even if there are 4 SSI in case of stereo.

Current driver setups un-used SSI in such case. It is no problem,
but not needed. This patch judges it.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sh/rcar/ssi.c

@@ -96,6 +96,8 @@ struct rsnd_ssi {
 #define rsnd_ssi_is_parent(ssi, io) ((ssi) == rsnd_io_to_mod_ssip(io))
 #define rsnd_ssi_is_multi_slave(mod, io) \
 	(rsnd_ssi_multi_slaves(io) & (1 << rsnd_mod_id(mod)))
+#define rsnd_ssi_is_run_mods(mod, io) \
+	(rsnd_ssi_run_mods(io) & (1 << rsnd_mod_id(mod)))
 
 int rsnd_ssi_use_busif(struct rsnd_dai_stream *io)
 {
@@ -166,6 +168,16 @@ static u32 rsnd_ssi_multi_slaves(struct rsnd_dai_stream *io)
 	return mask;
 }
 
+static u32 rsnd_ssi_run_mods(struct rsnd_dai_stream *io)
+{
+	struct rsnd_mod *ssi_mod = rsnd_io_to_mod_ssi(io);
+	struct rsnd_mod *ssi_parent_mod = rsnd_io_to_mod_ssip(io);
+
+	return rsnd_ssi_multi_slaves_runtime(io) |
+		1 << rsnd_mod_id(ssi_mod) |
+		1 << rsnd_mod_id(ssi_parent_mod);
+}
+
 u32 rsnd_ssi_multi_slaves_runtime(struct rsnd_dai_stream *io)
 {
 	struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io);
@@ -348,6 +360,9 @@ static int rsnd_ssi_init(struct rsnd_mod *mod,
 	struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
 	int ret;
 
+	if (!rsnd_ssi_is_run_mods(mod, io))
+		return 0;
+
 	ssi->usrcnt++;
 
 	rsnd_mod_power_on(mod);
@@ -374,6 +389,9 @@ static int rsnd_ssi_quit(struct rsnd_mod *mod,
 	struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
 	struct device *dev = rsnd_priv_to_dev(priv);
 
+	if (!rsnd_ssi_is_run_mods(mod, io))
+		return 0;
+
 	if (!ssi->usrcnt) {
 		dev_err(dev, "%s[%d] usrcnt error\n",
 			rsnd_mod_name(mod), rsnd_mod_id(mod));
@@ -422,6 +440,9 @@ static int rsnd_ssi_start(struct rsnd_mod *mod,
 			  struct rsnd_dai_stream *io,
 			  struct rsnd_priv *priv)
 {
+	if (!rsnd_ssi_is_run_mods(mod, io))
+		return 0;
+
 	/*
 	 * EN will be set via SSIU :: SSI_CONTROL
 	 * if Multi channel mode
@@ -441,6 +462,9 @@ static int rsnd_ssi_stop(struct rsnd_mod *mod,
 	struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
 	u32 cr;
 
+	if (!rsnd_ssi_is_run_mods(mod, io))
+		return 0;
+
 	/*
 	 * don't stop if not last user
 	 * see also
@@ -483,6 +507,9 @@ static int rsnd_ssi_irq(struct rsnd_mod *mod,
 	if (rsnd_ssi_is_parent(mod, io))
 		return 0;
 
+	if (!rsnd_ssi_is_run_mods(mod, io))
+		return 0;
+
 	if (enable)
 		val = rsnd_ssi_is_dma_mode(mod) ? 0x0e000000 : 0x0f000000;