ASoC: rsnd: enable rsnd_ssi_use_busif() for DMA

Renesas R-Car sound driver uses SSI, but the DMA interfaces are
SSI/SSIU. This interface is based on SSI/SRC/DVC connection.
And DMA function needs to know which interface is used somehow.
This patch enables rsnd_ssi_use_busif() for DMA.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sh/rcar/dma.c

@@ -427,7 +427,7 @@ rsnd_gen2_dma_addr(struct rsnd_priv *priv,
 		dev_err(dev, "DVC is selected without SRC\n");
 
 	/* use SSIU or SSI ? */
-	if (is_ssi && (0 == strcmp(rsnd_mod_dma_name(mod), "ssiu")))
+	if (is_ssi && rsnd_ssi_use_busif(mod))
 		is_ssi++;
 
 	return (is_from) ?

sound/soc/sh/rcar/rsnd.h

@@ -514,6 +514,7 @@ int rsnd_ssi_probe(struct platform_device *pdev,
 struct rsnd_mod *rsnd_ssi_mod_get(struct rsnd_priv *priv, int id);
 int rsnd_ssi_is_pin_sharing(struct rsnd_mod *mod);
 int rsnd_ssi_is_dma_mode(struct rsnd_mod *mod);
+int rsnd_ssi_use_busif(struct rsnd_mod *mod);
 
 /*
  *	R-Car DVC

sound/soc/sh/rcar/ssi.c

@@ -84,7 +84,7 @@ struct rsnd_ssi {
 #define rsnd_ssi_mode_flags(p) ((p)->info->flags)
 #define rsnd_ssi_dai_id(ssi) ((ssi)->info->dai_id)
 
-static int rsnd_ssi_use_busif(struct rsnd_mod *mod)
+int rsnd_ssi_use_busif(struct rsnd_mod *mod)
 {
 	struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
 	struct rsnd_dai_stream *io = rsnd_mod_to_io(mod);