ASoC: rsnd: care audio local bus data format consistency

R-Car sound uses Audio Local Bus which uses Lch/Rch format.
This bus is used if driver uses BUSIF.
But sound data is written as Rch/Lch format in register.
This means Rch <-> Lch will be inverted.
SSIU :: BUSIF_DALIGN is used to controlling data format.
Reported-by: Jun Watanabe <jun.watanabe.ue@renesas.com>
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

sound/soc/sh/rcar/gen.c

@@ -284,6 +284,7 @@ static int rsnd_gen2_probe(struct platform_device *pdev,
 		/* FIXME: it needs SSI_MODE2/3 in the future */
 		RSND_GEN_M_REG(SSI_BUSIF_MODE,	0x0,	0x80),
 		RSND_GEN_M_REG(SSI_BUSIF_ADINR,	0x4,	0x80),
+		RSND_GEN_M_REG(BUSIF_DALIGN,	0x8,	0x80),
 		RSND_GEN_M_REG(SSI_CTRL,	0x10,	0x80),
 		RSND_GEN_M_REG(INT_ENABLE,	0x18,	0x80),
 	};

sound/soc/sh/rcar/rsnd.h

@@ -90,6 +90,7 @@ enum rsnd_reg {
 	RSND_REG_SHARE19,
 	RSND_REG_SHARE20,
 	RSND_REG_SHARE21,
+	RSND_REG_SHARE22,
 
 	RSND_REG_MAX,
 };
@@ -127,6 +128,7 @@ enum rsnd_reg {
 #define RSND_REG_AUDIO_CLK_SEL2		RSND_REG_SHARE19
 #define RSND_REG_CMD_CTRL		RSND_REG_SHARE20
 #define RSND_REG_CMDOUT_TIMSEL		RSND_REG_SHARE21
+#define RSND_REG_BUSIF_DALIGN		RSND_REG_SHARE22
 
 struct rsnd_of_data;
 struct rsnd_priv;

sound/soc/sh/rcar/src.c

@@ -110,6 +110,8 @@ int rsnd_src_ssiu_start(struct rsnd_mod *ssi_mod,
 			struct rsnd_dai *rdai,
 			int use_busif)
 {
+	struct rsnd_dai_stream *io = rsnd_mod_to_io(ssi_mod);
+	struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io);
 	int ssi_id = rsnd_mod_id(ssi_mod);
 
 	/*
@@ -146,10 +148,27 @@ int rsnd_src_ssiu_start(struct rsnd_mod *ssi_mod,
 	 * DMA settings for SSIU
 	 */
 	if (use_busif) {
+		u32 val = 0x76543210;
+		u32 mask = ~0;
+
 		rsnd_mod_write(ssi_mod, SSI_BUSIF_ADINR,
 			       rsnd_get_adinr(ssi_mod));
 		rsnd_mod_write(ssi_mod, SSI_BUSIF_MODE,  1);
 		rsnd_mod_write(ssi_mod, SSI_CTRL, 0x1);
+
+		mask <<= runtime->channels * 4;
+		val = val & mask;
+
+		switch (runtime->sample_bits) {
+		case 16:
+			val |= 0x67452301 & ~mask;
+			break;
+		case 32:
+			val |= 0x76543210 & ~mask;
+			break;
+		}
+		rsnd_mod_write(ssi_mod, BUSIF_DALIGN, val);
+
 	}
 
 	return 0;