linux-kernel - [PATCH linux-next v2 8/9] ASoC: rsnd: ssi: Request dedicated dma channels for busif0 to 7

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Date:   Wed, 3 Oct 2018 18:01:22 +0900
From:   <jiada_wang@...tor.com>
To:     <lgirdwood@...il.com>, <broonie@...nel.org>, <perex@...ex.cz>,
        <tiwai@...e.com>, <kuninori.morimoto.gx@...esas.com>
CC:     <alsa-devel@...a-project.org>, <linux-kernel@...r.kernel.org>,
        <jiada_wang@...tor.com>
Subject: [PATCH linux-next v2 8/9] ASoC: rsnd: ssi: Request dedicated dma channels for busif0 to 7

From: Jiada Wang <jiada_wang@...tor.com>

Currently ssi driver only request dma channel for SSI_0,
which is used to transfer data to/from busif0.

But in GEN3 busif1 to busif7 also maybe used, dedicated dma channels
are requested for data transfer through these busif.

Signed-off-by: Jiada Wang <jiada_wang@...tor.com>
---
 sound/soc/sh/rcar/ssi.c | 28 +++++++++++++++++++++++-----
 1 file changed, 23 insertions(+), 5 deletions(-)

diff --git a/sound/soc/sh/rcar/ssi.c b/sound/soc/sh/rcar/ssi.c
index 3adcc4f778f7..992aeac09e76 100644
--- a/sound/soc/sh/rcar/ssi.c
+++ b/sound/soc/sh/rcar/ssi.c
@@ -76,6 +76,8 @@
 
 #define SSI_NAME "ssi"
 
+#define SSI_DMA_NAME_SIZE	10
+
 struct rsnd_ssi {
 	struct rsnd_mod mod;
 
@@ -938,12 +940,28 @@ static struct dma_chan *rsnd_ssi_dma_req(struct rsnd_dai_stream *io,
 {
 	struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
 	int is_play = rsnd_io_is_play(io);
-	char *name;
+	char name[SSI_DMA_NAME_SIZE];
 
-	if (rsnd_ssi_use_busif(io))
-		name = is_play ? "rxu" : "txu";
-	else
-		name = is_play ? "rx" : "tx";
+	if (rsnd_ssi_use_busif(io)) {
+		if (is_play)
+			snprintf(name, SSI_DMA_NAME_SIZE, "rxu");
+		else
+			snprintf(name, SSI_DMA_NAME_SIZE, "txu");
+
+		if (rsnd_is_gen3(priv)) {
+			/*
+			 * Gen3 supports to use all available BUSIF
+			 */
+			int busif = rsnd_ssi_get_busif(io);
+
+			snprintf(name, SSI_DMA_NAME_SIZE, "%s%d", name, busif);
+		}
+	} else {
+		if (is_play)
+			snprintf(name, SSI_DMA_NAME_SIZE, "rx");
+		else
+			snprintf(name, SSI_DMA_NAME_SIZE, "tx");
+	}
 
 	return rsnd_dma_request_channel(rsnd_ssi_of_node(priv),
 					mod, name);
-- 
2.17.0