Gh0st
/
linux
mirror of https://github.com/torvalds/linux.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

ASoC: dmaengine_pcm: Add port_window_size to DAI dma data struct 

The port_window_size is a struct member of dma slave channel runtime
config. It's the length of the register area in words the data need to
be accessed on the device side. It is only used for devices which is
using an area instead of a single register to send or receive the data.
Typically the DMA loops in this area in order to transfer the data.

It's useful for cases that reading/writing multiple registers in DMA
transactions.

Signed-off-by: Chancel Liu <chancel.liu@nxp.com>
Link: https://patch.msgid.link/20250808061741.187414-1-chancel.liu@nxp.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Chancel Liu 2025-08-08 15:17:41 +09:00 committed by Mark Brown
parent 605d902bb6
commit 32dffd4c3e
2 changed files with 7 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
include/sound/dmaengine_pcm.h
View File

@ -69,6 +69,10 @@ struct dma_chan *snd_dmaengine_pcm_get_chan(struct snd_pcm_substream *substream)
* @peripheral_config: peripheral configuration for programming peripheral
* for dmaengine transfer
* @peripheral_size: peripheral configuration buffer size
* @port_window_size: The length of the register area in words the data need
* to be accessed on the device side. It is only used for devices which is using
* an area instead of a single register to send/receive the data. Typically the
* DMA loops in this area in order to transfer the data.
*/
struct snd_dmaengine_dai_dma_data {
dma_addr_t addr;
@ -80,6 +84,7 @@ struct snd_dmaengine_dai_dma_data {
unsigned int flags;
void *peripheral_config;
size_t peripheral_size;
u32 port_window_size;
};
void snd_dmaengine_pcm_set_config_from_dai_data(

2
sound/core/pcm_dmaengine.c
View File

@ -111,6 +111,7 @@ void snd_dmaengine_pcm_set_config_from_dai_data(
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
slave_config->dst_addr = dma_data->addr;
slave_config->dst_maxburst = dma_data->maxburst;
slave_config->dst_port_window_size = dma_data->port_window_size;
if (dma_data->flags & SND_DMAENGINE_PCM_DAI_FLAG_PACK)
slave_config->dst_addr_width =
DMA_SLAVE_BUSWIDTH_UNDEFINED;
@ -119,6 +120,7 @@ void snd_dmaengine_pcm_set_config_from_dai_data(
} else {
slave_config->src_addr = dma_data->addr;
slave_config->src_maxburst = dma_data->maxburst;
slave_config->src_port_window_size = dma_data->port_window_size;
if (dma_data->flags & SND_DMAENGINE_PCM_DAI_FLAG_PACK)
slave_config->src_addr_width =
DMA_SLAVE_BUSWIDTH_UNDEFINED;