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ASoC: rsnd: Request/Release DMA channel each time

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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>
This commit is contained in:
Kuninori Morimoto 2016-11-14 04:20:40 +00:00 committed by Mark Brown
parent 3e58690b8d
commit edce5c496c
1 changed files with 106 additions and 76 deletions
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182
sound/soc/sh/rcar/dma.c
View File

@ -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 *data)
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_mod *mod,
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_mod *mod,
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_channel(struct device_node *of_node,
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;
struct dma_chan *chan;
if (dmaen->chan) {
dev_err(dev, "it already has dma channel\n");
return -EIO;
/* 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;
}
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;
}
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_stream *io, struct rsnd_mod *mod,
*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_stream *io, struct rsnd_mod *mod,
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);