[alsa-devel] [PATCH v4 1/3] ASoC: OMAP: data_type and sync_mode configurable in audio dma

[Candelaria Villareal, Jorge]

From: Misael Lopez Cruz <x0052729 at ti.com>

Allow client drivers to set the data_type (16, 32) and the
sync_mode (element, packet, etc) of the audio dma transferences.

McBSP dai driver configures it for a data type of 16 bits and
element sync mode.

Signed-off-by: Misael Lopez Cruz <x0052729 at ti.com>
Signed-off-by: Jorge Eduardo Candelaria <jorge.candelaria at ti.com>
---
 sound/soc/omap/omap-mcbsp.c |    2 ++
 sound/soc/omap/omap-pcm.c   |   15 ++++++++-------
 sound/soc/omap/omap-pcm.h   |    4 +++-
 3 files changed, 13 insertions(+), 8 deletions(-)

diff --git a/sound/soc/omap/omap-mcbsp.c b/sound/soc/omap/omap-mcbsp.c
index 6bbbd2a..d297256 100644
--- a/sound/soc/omap/omap-mcbsp.c
+++ b/sound/soc/omap/omap-mcbsp.c
@@ -287,6 +287,8 @@ static int omap_mcbsp_dai_hw_params(struct snd_pcm_substream *substream,
 	omap_mcbsp_dai_dma_params[id][substream->stream].dma_req = dma;
 	omap_mcbsp_dai_dma_params[id][substream->stream].port_addr = port;
 	omap_mcbsp_dai_dma_params[id][substream->stream].sync_mode = sync_mode;
+	omap_mcbsp_dai_dma_params[id][substream->stream].data_type =
+							OMAP_DMA_DATA_TYPE_S16;
 	cpu_dai->dma_data = &omap_mcbsp_dai_dma_params[id][substream->stream];
 
 	if (mcbsp_data->configured) {
diff --git a/sound/soc/omap/omap-pcm.c b/sound/soc/omap/omap-pcm.c
index 9db2770..825db38 100644
--- a/sound/soc/omap/omap-pcm.c
+++ b/sound/soc/omap/omap-pcm.c
@@ -37,7 +37,8 @@ static const struct snd_pcm_hardware omap_pcm_hardware = {
 				  SNDRV_PCM_INFO_INTERLEAVED |
 				  SNDRV_PCM_INFO_PAUSE |
 				  SNDRV_PCM_INFO_RESUME,
-	.formats		= SNDRV_PCM_FMTBIT_S16_LE,
+	.formats		= SNDRV_PCM_FMTBIT_S16_LE |
+				  SNDRV_PCM_FMTBIT_S32_LE,
 	.period_bytes_min	= 32,
 	.period_bytes_max	= 64 * 1024,
 	.periods_min		= 2,
@@ -149,6 +150,7 @@ static int omap_pcm_prepare(struct snd_pcm_substream *substream)
 	struct omap_runtime_data *prtd = runtime->private_data;
 	struct omap_pcm_dma_data *dma_data = prtd->dma_data;
 	struct omap_dma_channel_params dma_params;
+	int bytes;
 
 	/* return if this is a bufferless transfer e.g.
 	 * codec <--> BT codec or GSM modem -- lg FIXME */
@@ -156,11 +158,7 @@ static int omap_pcm_prepare(struct snd_pcm_substream *substream)
 		return 0;
 
 	memset(&dma_params, 0, sizeof(dma_params));
-	/*
-	 * Note: Regardless of interface data formats supported by OMAP McBSP
-	 * or EAC blocks, internal representation is always fixed 16-bit/sample
-	 */
-	dma_params.data_type			= OMAP_DMA_DATA_TYPE_S16;
+	dma_params.data_type			= dma_data->data_type;
 	dma_params.trigger			= dma_data->dma_req;
 	dma_params.sync_mode			= dma_data->sync_mode;
 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
@@ -170,6 +168,7 @@ static int omap_pcm_prepare(struct snd_pcm_substream *substream)
 		dma_params.src_start		= runtime->dma_addr;
 		dma_params.dst_start		= dma_data->port_addr;
 		dma_params.dst_port		= OMAP_DMA_PORT_MPUI;
+		dma_params.dst_fi		= dma_data->packet_size;
 	} else {
 		dma_params.src_amode		= OMAP_DMA_AMODE_CONSTANT;
 		dma_params.dst_amode		= OMAP_DMA_AMODE_POST_INC;
@@ -177,6 +176,7 @@ static int omap_pcm_prepare(struct snd_pcm_substream *substream)
 		dma_params.src_start		= dma_data->port_addr;
 		dma_params.dst_start		= runtime->dma_addr;
 		dma_params.src_port		= OMAP_DMA_PORT_MPUI;
+		dma_params.src_fi		= dma_data->packet_size;
 	}
 	/*
 	 * Set DMA transfer frame size equal to ALSA period size and frame
@@ -184,7 +184,8 @@ static int omap_pcm_prepare(struct snd_pcm_substream *substream)
 	 * we can transfer the whole ALSA buffer with single DMA transfer but
 	 * still can get an interrupt at each period bounary
 	 */
-	dma_params.elem_count	= snd_pcm_lib_period_bytes(substream) / 2;
+	bytes = snd_pcm_lib_period_bytes(substream);
+	dma_params.elem_count	= bytes >> dma_data->data_type;
 	dma_params.frame_count	= runtime->periods;
 	omap_set_dma_params(prtd->dma_ch, &dma_params);
 
diff --git a/sound/soc/omap/omap-pcm.h b/sound/soc/omap/omap-pcm.h
index 38a821d..b19975d 100644
--- a/sound/soc/omap/omap-pcm.h
+++ b/sound/soc/omap/omap-pcm.h
@@ -29,8 +29,10 @@ struct omap_pcm_dma_data {
 	char		*name;		/* stream identifier */
 	int		dma_req;	/* DMA request line */
 	unsigned long	port_addr;	/* transmit/receive register */
-	int		sync_mode;	/* DMA sync mode */
 	void (*set_threshold)(struct snd_pcm_substream *substream);
+	int		data_type;	/* data type 8,16,32 */
+	int		sync_mode;	/* DMA sync mode */
+	int		packet_size;	/* packet size only in PACKET mode */
 };
 
 extern struct snd_soc_platform omap_soc_platform;
-- 
1.6.0.4