Unverified Commit 5423d772 authored by Kuninori Morimoto's avatar Kuninori Morimoto Committed by Mark Brown
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ASoC: rsnd: Enable IPMMU v2 



commit 4821d914 ("ASoC: rsnd: use dma_sync_single_for_xxx() for
IOMMU") (= v1) which have been already reverted had supported IPMMU
support on rsnd driver.
Because memory allocating timing and DMAEngine access timing were
different, it used continuous memory and called dma map function by
itself.

OTOH, it is using DMA descriptor mode (= DMA cyclic mode), thus, there
was timing conflict between DMA sync/unsync and DMA transfer starting,
and it maked sound noise.

This patch supports IPMMU with coherent memory, and, it uses Audio DMAC
dev for allocating memory by snd_pcm_lib_preallocate_pages_for_all() to
indicate memory area to IPMMU.
One note is that Playback/Capture need each paired Audio DMAC dev.
Because of this, we need to keep each paired Audio DMAC dev when probing,
and use it when allocating each memory for IPMMU.

Signed-off-by: default avatarKuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Tested-by: default avatarHiroyuki Yokoyama <hiroyuki.yokoyama.vx@renesas.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent a93532db

sound/soc/sh/rcar/core.c

+42 −5
Original line number Diff line number Diff line
@@ -1352,6 +1352,37 @@ int rsnd_kctrl_new(struct rsnd_mod *mod, 
#define PREALLOC_BUFFER		(32 * 1024)

#define PREALLOC_BUFFER_MAX	(32 * 1024)



static int rsnd_preallocate_pages(struct snd_soc_pcm_runtime *rtd,

				  struct rsnd_dai_stream *io,

				  int stream)

{

	struct rsnd_priv *priv = rsnd_io_to_priv(io);

	struct device *dev = rsnd_priv_to_dev(priv);

	struct snd_pcm_substream *substream;

	int err;



	/*

	 * use Audio-DMAC dev if we can use IPMMU

	 * see

	 *	rsnd_dmaen_attach()

	 */

	if (io->dmac_dev)

		dev = io->dmac_dev;



	for (substream = rtd->pcm->streams[stream].substream;

	     substream;

	     substream = substream->next) {

		err = snd_pcm_lib_preallocate_pages(substream,

					SNDRV_DMA_TYPE_DEV,

					dev,

					PREALLOC_BUFFER, PREALLOC_BUFFER_MAX);

		if (err < 0)

			return err;

	}



	return 0;

}



static int rsnd_pcm_new(struct snd_soc_pcm_runtime *rtd)

{

	struct snd_soc_dai *dai = rtd->cpu_dai;
@@ -1366,11 +1397,17 @@ static int rsnd_pcm_new(struct snd_soc_pcm_runtime *rtd) 
	if (ret)

		return ret;



	return snd_pcm_lib_preallocate_pages_for_all(

		rtd->pcm,

		SNDRV_DMA_TYPE_DEV,

		rtd->card->snd_card->dev,

		PREALLOC_BUFFER, PREALLOC_BUFFER_MAX);

	ret = rsnd_preallocate_pages(rtd, &rdai->playback,

				     SNDRV_PCM_STREAM_PLAYBACK);

	if (ret)

		return ret;



	ret = rsnd_preallocate_pages(rtd, &rdai->capture,

				     SNDRV_PCM_STREAM_CAPTURE);

	if (ret)

		return ret;



	return 0;

}



static const struct snd_soc_component_driver rsnd_soc_component = {

sound/soc/sh/rcar/dma.c

+7 −0
Original line number Diff line number Diff line
@@ -253,6 +253,13 @@ static int rsnd_dmaen_attach(struct rsnd_dai_stream *io, 
		return -EAGAIN;

	}



	/*

	 * use it for IPMMU if needed

	 * see

	 *	rsnd_preallocate_pages()

	 */

	io->dmac_dev = chan->device->dev;



	dma_release_channel(chan);



	dmac->dmaen_num++;

sound/soc/sh/rcar/rsnd.h

+1 −0
Original line number Diff line number Diff line
@@ -435,6 +435,7 @@ struct rsnd_dai_stream { 
	struct snd_pcm_substream *substream;

	struct rsnd_mod *mod[RSND_MOD_MAX];

	struct rsnd_dai *rdai;

	struct device *dmac_dev; /* for IPMMU */

	u32 parent_ssi_status;

};

#define rsnd_io_to_mod(io, i)	((i) < RSND_MOD_MAX ? (io)->mod[(i)] : NULL)

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