patches.renesas/0077-ASoC-rsnd-Request-Release-DMA-channel-each-time.patch

From ed7e63c420402c420cbc0b7e68fafa39ce857087 Mon Sep 17 00:00:00 2001
From: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Date: Mon, 14 Nov 2016 04:20:40 +0000
Subject: [PATCH 077/299] ASoC: rsnd: Request/Release DMA channel each time

Current Renesas Sound driver requests DMA channel when .probe timing,
and release it when .remove timing. And use DMA on .start/.stop
But, Audio DMAC power ON was handled when request timing (= .probe),
and power OFF was when release timing (= .remove).
This means Audio DMAC power is always ON during driver was enabled.
The best choice to solve this issue is that DMAEngine side handle
this. But current DMAEngine API design can't solve atmic/non-atmic
context issue for power ON/OFF. So next better choice is sound
driver request/release DMA channel each time. This patch do it

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
(cherry picked from commit edce5c496c6af3e5ca6e1bb18f7cf4f6ef6226fa)
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
---
 sound/soc/sh/rcar/dma.c |  182 +++++++++++++++++++++++++++---------------------
 1 file changed, 106 insertions(+), 76 deletions(-)

--- a/sound/soc/sh/rcar/dma.c
+++ b/sound/soc/sh/rcar/dma.c
@@ -34,6 +34,8 @@ struct rsnd_dmapp {
 
 struct rsnd_dma {
 	struct rsnd_mod		mod;
+	struct rsnd_mod		*mod_from;
+	struct rsnd_mod		*mod_to;
 	dma_addr_t		src_addr;
 	dma_addr_t		dst_addr;
 	union {
@@ -92,6 +94,20 @@ static void rsnd_dmaen_complete(void *da
 	rsnd_mod_interrupt(mod, __rsnd_dmaen_complete);
 }
 
+static struct dma_chan *rsnd_dmaen_request_channel(struct rsnd_dai_stream *io,
+						   struct rsnd_mod *mod_from,
+						   struct rsnd_mod *mod_to)
+{
+	if ((!mod_from && !mod_to) ||
+	    (mod_from && mod_to))
+		return NULL;
+
+	if (mod_from)
+		return rsnd_mod_dma_req(io, mod_from);
+	else
+		return rsnd_mod_dma_req(io, mod_to);
+}
+
 static int rsnd_dmaen_stop(struct rsnd_mod *mod,
 			   struct rsnd_dai_stream *io,
 			   struct rsnd_priv *priv)
@@ -99,7 +115,61 @@ static int rsnd_dmaen_stop(struct rsnd_m
 	struct rsnd_dma *dma = rsnd_mod_to_dma(mod);
 	struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma);
 
-	dmaengine_terminate_all(dmaen->chan);
+	if (dmaen->chan) {
+		dmaengine_terminate_all(dmaen->chan);
+	}
+
+	return 0;
+}
+
+static int rsnd_dmaen_nolock_stop(struct rsnd_mod *mod,
+				   struct rsnd_dai_stream *io,
+				   struct rsnd_priv *priv)
+{
+	struct rsnd_dma *dma = rsnd_mod_to_dma(mod);
+	struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma);
+
+	/*
+	 * DMAEngine release uses mutex lock.
+	 * Thus, it shouldn't be called under spinlock.
+	 * Let's call it under nolock_start
+	 */
+	if (dmaen->chan)
+		dma_release_channel(dmaen->chan);
+
+	dmaen->chan = NULL;
+
+	return 0;
+}
+
+static int rsnd_dmaen_nolock_start(struct rsnd_mod *mod,
+			    struct rsnd_dai_stream *io,
+			    struct rsnd_priv *priv)
+{
+	struct rsnd_dma *dma = rsnd_mod_to_dma(mod);
+	struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma);
+	struct device *dev = rsnd_priv_to_dev(priv);
+
+	if (dmaen->chan) {
+		dev_err(dev, "it already has dma channel\n");
+		return -EIO;
+	}
+
+	/*
+	 * DMAEngine request uses mutex lock.
+	 * Thus, it shouldn't be called under spinlock.
+	 * Let's call it under nolock_start
+	 */
+	dmaen->chan = rsnd_dmaen_request_channel(io,
+						 dma->mod_from,
+						 dma->mod_to);
+	if (IS_ERR_OR_NULL(dmaen->chan)) {
+		int ret = PTR_ERR(dmaen->chan);
+
+		dmaen->chan = NULL;
+		dev_err(dev, "can't get dma channel\n");
+		return ret;
+	}
 
 	return 0;
 }
@@ -113,7 +183,23 @@ static int rsnd_dmaen_start(struct rsnd_
 	struct snd_pcm_substream *substream = io->substream;
 	struct device *dev = rsnd_priv_to_dev(priv);
 	struct dma_async_tx_descriptor *desc;
+	struct dma_slave_config cfg = {};
 	int is_play = rsnd_io_is_play(io);
+	int ret;
+
+	cfg.direction	= is_play ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM;
+	cfg.src_addr	= dma->src_addr;
+	cfg.dst_addr	= dma->dst_addr;
+	cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+	cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+
+	dev_dbg(dev, "%s[%d] %pad -> %pad\n",
+		rsnd_mod_name(mod), rsnd_mod_id(mod),
+		&cfg.src_addr, &cfg.dst_addr);
+
+	ret = dmaengine_slave_config(dmaen->chan, &cfg);
+	if (ret < 0)
+		return ret;
 
 	desc = dmaengine_prep_dma_cyclic(dmaen->chan,
 					 substream->runtime->dma_addr,
@@ -159,97 +245,39 @@ struct dma_chan *rsnd_dma_request_channe
 	return chan;
 }
 
-static struct dma_chan *rsnd_dmaen_request_channel(struct rsnd_dai_stream *io,
-						   struct rsnd_mod *mod_from,
-						   struct rsnd_mod *mod_to)
-{
-	if ((!mod_from && !mod_to) ||
-	    (mod_from && mod_to))
-		return NULL;
-
-	if (mod_from)
-		return rsnd_mod_dma_req(io, mod_from);
-	else
-		return rsnd_mod_dma_req(io, mod_to);
-}
-
-static int rsnd_dmaen_remove(struct rsnd_mod *mod,
-			      struct rsnd_dai_stream *io,
-			      struct rsnd_priv *priv)
-{
-	struct rsnd_dma *dma = rsnd_mod_to_dma(mod);
-	struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma);
-
-	if (dmaen->chan)
-		dma_release_channel(dmaen->chan);
-
-	dmaen->chan = NULL;
-
-	return 0;
-}
-
 static int rsnd_dmaen_attach(struct rsnd_dai_stream *io,
 			   struct rsnd_dma *dma,
 			   struct rsnd_mod *mod_from, struct rsnd_mod *mod_to)
 {
-	struct rsnd_mod *mod = rsnd_mod_get(dma);
-	struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma);
 	struct rsnd_priv *priv = rsnd_io_to_priv(io);
 	struct rsnd_dma_ctrl *dmac = rsnd_priv_to_dmac(priv);
-	struct device *dev = rsnd_priv_to_dev(priv);
-	struct dma_slave_config cfg = {};
-	int is_play = rsnd_io_is_play(io);
-	int ret;
-
-	if (dmaen->chan) {
-		dev_err(dev, "it already has dma channel\n");
-		return -EIO;
-	}
+	struct dma_chan *chan;
 
-	dmaen->chan = rsnd_dmaen_request_channel(io, mod_from, mod_to);
-
-	if (IS_ERR_OR_NULL(dmaen->chan)) {
-		dmaen->chan = NULL;
-		dev_err(dev, "can't get dma channel\n");
-		goto rsnd_dma_channel_err;
+	/* try to get DMAEngine channel */
+	chan = rsnd_dmaen_request_channel(io, mod_from, mod_to);
+	if (IS_ERR_OR_NULL(chan)) {
+		/*
+		 * DMA failed. try to PIO mode
+		 * see
+		 *	rsnd_ssi_fallback()
+		 *	rsnd_rdai_continuance_probe()
+		 */
+		return -EAGAIN;
 	}
 
-	cfg.direction	= is_play ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM;
-	cfg.src_addr	= dma->src_addr;
-	cfg.dst_addr	= dma->dst_addr;
-	cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
-	cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
-
-	dev_dbg(dev, "%s[%d] %pad -> %pad\n",
-		rsnd_mod_name(mod), rsnd_mod_id(mod),
-		&cfg.src_addr, &cfg.dst_addr);
-
-	ret = dmaengine_slave_config(dmaen->chan, &cfg);
-	if (ret < 0)
-		goto rsnd_dma_attach_err;
+	dma_release_channel(chan);
 
 	dmac->dmaen_num++;
 
 	return 0;
-
-rsnd_dma_attach_err:
-	rsnd_dmaen_remove(mod, io, priv);
-rsnd_dma_channel_err:
-
-	/*
-	 * DMA failed. try to PIO mode
-	 * see
-	 *	rsnd_ssi_fallback()
-	 *	rsnd_rdai_continuance_probe()
-	 */
-	return -EAGAIN;
 }
 
 static struct rsnd_mod_ops rsnd_dmaen_ops = {
 	.name	= "audmac",
+	.nolock_start = rsnd_dmaen_nolock_start,
+	.nolock_stop  = rsnd_dmaen_nolock_stop,
 	.start	= rsnd_dmaen_start,
 	.stop	= rsnd_dmaen_stop,
-	.remove	= rsnd_dmaen_remove,
 };
 
 /*
@@ -671,9 +699,6 @@ int rsnd_dma_attach(struct rsnd_dai_stre
 
 		*dma_mod = rsnd_mod_get(dma);
 
-		dma->src_addr = rsnd_dma_addr(io, mod_from, is_play, 1);
-		dma->dst_addr = rsnd_dma_addr(io, mod_to,   is_play, 0);
-
 		ret = rsnd_mod_init(priv, *dma_mod, ops, NULL,
 				    rsnd_mod_get_status, type, dma_id);
 		if (ret < 0)
@@ -687,6 +712,11 @@ int rsnd_dma_attach(struct rsnd_dai_stre
 		ret = attach(io, dma, mod_from, mod_to);
 		if (ret < 0)
 			return ret;
+
+		dma->src_addr = rsnd_dma_addr(io, mod_from, is_play, 1);
+		dma->dst_addr = rsnd_dma_addr(io, mod_to,   is_play, 0);
+		dma->mod_from = mod_from;
+		dma->mod_to   = mod_to;
 	}
 
 	ret = rsnd_dai_connect(*dma_mod, io, type);