Commit 4821d914 authored by Kuninori Morimoto's avatar Kuninori Morimoto Committed by Mark Brown
Browse files

ASoC: rsnd: use dma_sync_single_for_xxx() for IOMMU 



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: default avatarKuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent edce5c49

sound/soc/sh/rcar/core.c

+2 −2
Original line number Diff line number Diff line
@@ -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);

}

sound/soc/sh/rcar/dma.c

+80 −4
Original line number Diff line number Diff line
@@ -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;

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