ASoC: rsnd: tidyup PIO/DMA mode settings method

Current ssi.c has .cr_etc which is used for SSICR's
etc settings. but, it is used as PIO/DMA switching purpose now.
This patch tidyup this method. This is prepare for
under/over run issue handling

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sh/rcar/rsnd.h

@@ -445,6 +445,7 @@ int rsnd_ssi_probe(struct platform_device *pdev,
 		   struct rsnd_priv *priv);
 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);
 
 /*
  *	R-Car DVC

sound/soc/sh/rcar/ssi.c

@@ -68,7 +68,6 @@ struct rsnd_ssi {
 	struct rsnd_dai *rdai;
 	u32 cr_own;
 	u32 cr_clk;
-	u32 cr_etc;
 	int err;
 	unsigned int usrcnt;
 	unsigned int rate;
@@ -185,6 +184,7 @@ static void rsnd_ssi_hw_start(struct rsnd_ssi *ssi,
 {
 	struct rsnd_priv *priv = rsnd_mod_to_priv(&ssi->mod);
 	struct device *dev = rsnd_priv_to_dev(priv);
+	u32 cr_mode;
 	u32 cr;
 
 	if (0 == ssi->usrcnt) {
@@ -198,9 +198,14 @@ static void rsnd_ssi_hw_start(struct rsnd_ssi *ssi,
 		}
 	}
 
+	cr_mode = rsnd_ssi_is_dma_mode(&ssi->mod) ?
+		DMEN :			/* DMA : use DMA */
+		UIEN | OIEN | DIEN;	/* PIO : enable interrupt */
+
+
 	cr  =	ssi->cr_own	|
 		ssi->cr_clk	|
-		ssi->cr_etc	|
+		cr_mode		|
 		EN;
 
 	rsnd_mod_write(&ssi->mod, SSICR, cr);
@@ -403,9 +408,6 @@ static int rsnd_ssi_pio_start(struct rsnd_mod *mod,
 	struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
 	struct rsnd_dai_stream *io = rsnd_mod_to_io(mod);
 
-	/* enable PIO IRQ */
-	ssi->cr_etc = UIEN | OIEN | DIEN;
-
 	rsnd_src_ssiu_start(mod, rdai, 0);
 
 	rsnd_src_enable_ssi_irq(mod, rdai);
@@ -420,8 +422,6 @@ static int rsnd_ssi_pio_stop(struct rsnd_mod *mod,
 {
 	struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
 
-	ssi->cr_etc = 0;
-
 	rsnd_ssi_hw_stop(ssi, rdai);
 
 	rsnd_src_ssiu_stop(mod, rdai);
@@ -498,9 +498,6 @@ static int rsnd_ssi_dma_start(struct rsnd_mod *mod,
 	struct rsnd_dma *dma = rsnd_mod_to_dma(&ssi->mod);
 	struct rsnd_dai_stream *io = rsnd_mod_to_io(mod);
 
-	/* enable DMA transfer */
-	ssi->cr_etc = DMEN;
-
 	rsnd_src_ssiu_start(mod, rdai, rsnd_ssi_use_busif(mod));
 
 	rsnd_dma_start(dma);
@@ -520,8 +517,6 @@ static int rsnd_ssi_dma_stop(struct rsnd_mod *mod,
 	struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
 	struct rsnd_dma *dma = rsnd_mod_to_dma(&ssi->mod);
 
-	ssi->cr_etc = 0;
-
 	rsnd_ssi_record_error(ssi, rsnd_mod_read(mod, SSISR));
 
 	rsnd_ssi_hw_stop(ssi, rdai);
@@ -550,6 +545,12 @@ static struct rsnd_mod_ops rsnd_ssi_dma_ops = {
 	.fallback = rsnd_ssi_fallback,
 };
 
+int rsnd_ssi_is_dma_mode(struct rsnd_mod *mod)
+{
+	return mod->ops == &rsnd_ssi_dma_ops;
+}
+
+
 /*
  *		Non SSI
  */