ASoC: rsnd: tidyup SSI init/start sequence

SSI want to have SSIWSR settings and SSICR settings without EN bit
when init, and SSICR EN bit only when start timing.
Otherwise, SSI output signal might be unstable.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sh/rcar/ssi.c

@@ -276,7 +276,7 @@ static void rsnd_ssi_master_clk_stop(struct rsnd_mod *mod,
 	rsnd_adg_ssi_clk_stop(mod);
 }
 
-static int rsnd_ssi_config_init(struct rsnd_mod *mod,
+static void rsnd_ssi_config_init(struct rsnd_mod *mod,
 				struct rsnd_dai_stream *io)
 {
 	struct rsnd_dai *rdai = rsnd_io_to_rdai(io);
@@ -313,8 +313,6 @@ static int rsnd_ssi_config_init(struct rsnd_mod *mod,
 	case 32:
 		cr_own |= DWL_24;
 		break;
-	default:
-		return -EINVAL;
 	}
 
 	if (rsnd_ssi_is_dma_mode(mod)) {
@@ -338,8 +336,16 @@ static int rsnd_ssi_config_init(struct rsnd_mod *mod,
 	ssi->cr_own	= cr_own;
 	ssi->cr_mode	= cr_mode;
 	ssi->wsr	= wsr;
+}
 
-	return 0;
+static void rsnd_ssi_register_setup(struct rsnd_mod *mod)
+{
+	struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
+
+	rsnd_mod_write(mod, SSIWSR,	ssi->wsr);
+	rsnd_mod_write(mod, SSICR,	ssi->cr_own	|
+					ssi->cr_clk	|
+					ssi->cr_mode); /* without EN */
 }
 
 /*
@@ -360,12 +366,10 @@ static int rsnd_ssi_init(struct rsnd_mod *mod,
 	if (ret < 0)
 		return ret;
 
-	if (rsnd_ssi_is_parent(mod, io))
-		return 0;
+	if (!rsnd_ssi_is_parent(mod, io))
+		rsnd_ssi_config_init(mod, io);
 
-	ret = rsnd_ssi_config_init(mod, io);
-	if (ret < 0)
-		return ret;
+	rsnd_ssi_register_setup(mod);
 
 	/* clear error status */
 	rsnd_ssi_status_clear(mod);
@@ -428,22 +432,14 @@ static int rsnd_ssi_start(struct rsnd_mod *mod,
 			  struct rsnd_dai_stream *io,
 			  struct rsnd_priv *priv)
 {
-	struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
-	u32 cr;
-
-	cr  =	ssi->cr_own	|
-		ssi->cr_clk	|
-		ssi->cr_mode;
-
 	/*
 	 * EN will be set via SSIU :: SSI_CONTROL
 	 * if Multi channel mode
 	 */
-	if (!rsnd_ssi_multi_slaves(io))
-		cr |= EN;
+	if (rsnd_ssi_multi_slaves(io))
+		return 0;
 
-	rsnd_mod_write(mod, SSICR, cr);
-	rsnd_mod_write(mod, SSIWSR, ssi->wsr);
+	rsnd_mod_bset(mod, SSICR, EN, EN);
 
 	return 0;
 }