From: Kuninori Morimoto kuninori.morimoto.gx@renesas.com

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 --- v1 -> v2 -> v3

- tidyup rsnd_dmaen_nolock_start() PTR_ERR() handling

sound/soc/sh/rcar/dma.c | 184 ++++++++++++++++++++++++++++-------------------- 1 file changed, 107 insertions(+), 77 deletions(-)

diff --git a/sound/soc/sh/rcar/dma.c b/sound/soc/sh/rcar/dma.c index 2f03277..3c663a5 100644 --- 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 *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; - - if (dmaen->chan) { - dev_err(dev, "it already has dma channel\n"); - return -EIO; - } - - 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; + struct dma_chan *chan; + + /* 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_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);

From: Kuninori Morimoto kuninori.morimoto.gx@renesas.com

IOMMU needs DMA mapping function to use it. One solution is that we can use DMA mapped dev on snd_pcm_lib_preallocate_pages_for_all() for SNDRV_DMA_TYPE_DEV. But pcm_new and dma map timing are mismatched. Thus, this patch uses SNDRV_DMA_TYPE_CONTINUOUS for pcm_new, and use dma_sync_single_for_xxx() for each transfer.

Signed-off-by: Kuninori Morimoto kuninori.morimoto.gx@renesas.com --- v1 -> v2 -> v3

- no change

sound/soc/sh/rcar/core.c | 4 +-- sound/soc/sh/rcar/dma.c | 84 +++++++++++++++++++++++++++++++++++++++++++++--- 2 files changed, 82 insertions(+), 6 deletions(-)

diff --git a/sound/soc/sh/rcar/core.c b/sound/soc/sh/rcar/core.c index 9ffa299..912dc62 100644 --- a/sound/soc/sh/rcar/core.c +++ b/sound/soc/sh/rcar/core.c @@ -1126,8 +1126,8 @@ static int rsnd_pcm_new(struct snd_soc_pcm_runtime *rtd)

return snd_pcm_lib_preallocate_pages_for_all( rtd->pcm, - SNDRV_DMA_TYPE_DEV, - rtd->card->snd_card->dev, + SNDRV_DMA_TYPE_CONTINUOUS, + snd_dma_continuous_data(GFP_KERNEL), PREALLOC_BUFFER, PREALLOC_BUFFER_MAX); }

diff --git a/sound/soc/sh/rcar/dma.c b/sound/soc/sh/rcar/dma.c index 3c663a5..1f405c8 100644 --- a/sound/soc/sh/rcar/dma.c +++ b/sound/soc/sh/rcar/dma.c @@ -25,6 +25,10 @@

struct rsnd_dmaen { struct dma_chan *chan; + dma_addr_t dma_buf; + unsigned int dma_len; + unsigned int dma_period; + unsigned int dma_cnt; };

struct rsnd_dmapp { @@ -58,10 +62,38 @@ struct rsnd_dma_ctrl { /* * Audio DMAC */ +#define rsnd_dmaen_sync(dmaen, io, i) __rsnd_dmaen_sync(dmaen, io, i, 1) +#define rsnd_dmaen_unsync(dmaen, io, i) __rsnd_dmaen_sync(dmaen, io, i, 0) +static void __rsnd_dmaen_sync(struct rsnd_dmaen *dmaen, struct rsnd_dai_stream *io, + int i, int sync) +{ + struct device *dev = dmaen->chan->device->dev; + enum dma_data_direction dir; + int is_play = rsnd_io_is_play(io); + dma_addr_t buf; + int len, max; + size_t period; + + len = dmaen->dma_len; + period = dmaen->dma_period; + max = len / period; + i = i % max; + buf = dmaen->dma_buf + (period * i); + + dir = is_play ? DMA_TO_DEVICE : DMA_FROM_DEVICE; + + if (sync) + dma_sync_single_for_device(dev, buf, period, dir); + else + dma_sync_single_for_cpu(dev, buf, period, dir); +} + static void __rsnd_dmaen_complete(struct rsnd_mod *mod, struct rsnd_dai_stream *io) { struct rsnd_priv *priv = rsnd_mod_to_priv(mod); + struct rsnd_dma *dma = rsnd_mod_to_dma(mod); + struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma); bool elapsed = false; unsigned long flags;

@@ -78,9 +110,22 @@ static void __rsnd_dmaen_complete(struct rsnd_mod *mod, */ spin_lock_irqsave(&priv->lock, flags);

- if (rsnd_io_is_working(io)) + if (rsnd_io_is_working(io)) { + rsnd_dmaen_unsync(dmaen, io, dmaen->dma_cnt); + + /* + * Next period is already started. + * Let's sync Next Next period + * see + * rsnd_dmaen_start() + */ + rsnd_dmaen_sync(dmaen, io, dmaen->dma_cnt + 2); + elapsed = rsnd_dai_pointer_update(io, io->byte_per_period);

+ dmaen->dma_cnt++; + } + spin_unlock_irqrestore(&priv->lock, flags);

if (elapsed) @@ -116,7 +161,12 @@ static int rsnd_dmaen_stop(struct rsnd_mod *mod, struct rsnd_dmaen *dmaen = rsnd_dma_to_dmaen(dma);

if (dmaen->chan) { + int is_play = rsnd_io_is_play(io); + dmaengine_terminate_all(dmaen->chan); + dma_unmap_single(dmaen->chan->device->dev, + dmaen->dma_buf, dmaen->dma_len, + is_play ? DMA_TO_DEVICE : DMA_FROM_DEVICE); }

return 0; @@ -184,7 +234,11 @@ static int rsnd_dmaen_start(struct rsnd_mod *mod, struct device *dev = rsnd_priv_to_dev(priv); struct dma_async_tx_descriptor *desc; struct dma_slave_config cfg = {}; + dma_addr_t buf; + size_t len; + size_t period; int is_play = rsnd_io_is_play(io); + int i; int ret;

cfg.direction = is_play ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM; @@ -201,10 +255,19 @@ static int rsnd_dmaen_start(struct rsnd_mod *mod, if (ret < 0) return ret;

+ len = snd_pcm_lib_buffer_bytes(substream); + period = snd_pcm_lib_period_bytes(substream); + buf = dma_map_single(dmaen->chan->device->dev, + substream->runtime->dma_area, + len, + is_play ? DMA_TO_DEVICE : DMA_FROM_DEVICE); + if (dma_mapping_error(dmaen->chan->device->dev, buf)) { + dev_err(dev, "dma map failed\n"); + return -EIO; + } + desc = dmaengine_prep_dma_cyclic(dmaen->chan, - substream->runtime->dma_addr, - snd_pcm_lib_buffer_bytes(substream), - snd_pcm_lib_period_bytes(substream), + buf, len, period, is_play ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);

@@ -216,6 +279,19 @@ static int rsnd_dmaen_start(struct rsnd_mod *mod, desc->callback = rsnd_dmaen_complete; desc->callback_param = rsnd_mod_get(dma);

+ dmaen->dma_buf = buf; + dmaen->dma_len = len; + dmaen->dma_period = period; + dmaen->dma_cnt = 0; + + /* + * synchronize this and next period + * see + * __rsnd_dmaen_complete() + */ + for (i = 0; i < 2; i++) + rsnd_dmaen_sync(dmaen, io, i); + if (dmaengine_submit(desc) < 0) { dev_err(dev, "dmaengine_submit() fail\n"); return -EIO;