kernel/linux.git/include/sound/dmaengine_pcm.h, branch v6.18.21

ASoC: dmaengine_pcm: Add port_window_size to DAI dma data struct

2025-08-10T20:09:12+00:00

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 Link: https://patch.msgid.link/20250808061741.187414-1-chancel.liu@nxp.com Signed-off-by: Mark Brown

ALSA: pcm: Remove unused snd_dmaengine_pcm_open_request_chan

2025-05-05T10:36:29+00:00

snd_dmaengine_pcm_open_request_chan() last use was removed in 2022's commit b401d1fd8053 ("ASoC: pxa: remove unused board support") Remove it. Signed-off-by: Dr. David Alan Gilbert Signed-off-by: Takashi Iwai Link: https://patch.msgid.link/20250502235219.1000429-3-linux@treblig.org

ALSA: dmaengine: Synchronize dma channel after drop()

2024-06-11T16:13:31+00:00

Sometimes the stream may be stopped due to XRUN events, in which case the userspace can call snd_pcm_drop() and snd_pcm_prepare() to stop and start the stream again. In these cases, we must wait for the DMA channel to synchronize before marking the stream as prepared for playback, as the DMA channel gets stopped by drop() without any synchronization. Make sure the ALSA core synchronizes the DMA channel by adding a sync_stop() hook. Reviewed-by: Peter Ujfalusi Signed-off-by: Jai Luthra Link: https://lore.kernel.org/r/20240611-asoc_next-v3-1-fcfd84b12164@ti.com Signed-off-by: Mark Brown

ASoC: dmaengine_pcm: Allow passing component name via config

2024-03-25T00:49:47+00:00

At the moment we cannot instantiate two dmaengine_pcms with the same parent device, as the components will be named the same, leading to conflicts. Add 'name' field to the snd_dmaengine_pcm_config, and use that (if defined) as the component name instead of deriving the component name from the device. Signed-off-by: Tomi Valkeinen Link: https://msgid.link/r/20240319-xilinx-dp-audio-v2-1-92d6d3a7ca7e@ideasonboard.com Signed-off-by: Mark Brown

ASoC: dmaengine: Drop unused iov_iter for process callback

2023-09-01T13:38:29+00:00

Passing the iov_iter to the process callback is rather buggy, as the iterator has been already processed for playback. Similarly, it makes the copy for capture buggy after the process callback reading the iterator out. Moreover, all existing process callbacks don't refer to the passed iterator at all. So, it's better to drop the argument from the process callback. Fixes: 9bebd65443c1 ("ASoC: dmaengine: Use iov_iter for process callback, too") Suggested-by: Linus Torvalds Link: https://lore.kernel.org/r/CAHk-=wje+VkXjjfVTmK-uJdG_M5=ar14QxAwK+XDiq07k_pzBg@mail.gmail.com Reviewed-by: Mark Brown Link: https://lore.kernel.org/r/20230831130457.8180-1-tiwai@suse.de Signed-off-by: Takashi Iwai

ASoC: dmaengine: Use iov_iter for process callback, too

2023-08-18T10:19:18+00:00

Along with the conversion to PCM copy ops, use the iov_iter for the pointer to be passed to the dmaengine process callback, too. It avoids the direct reference of iter_iov_addr(), and it can potentially help for the drivers to access memory properly (although both atmel and stm drivers don't use the given buffer address at all for now). Reviewed-by: Mark Brown Cc: Lars-Peter Clausen Cc: Claudiu Beznea Cc: Olivier Moysan Cc: Arnaud Pouliquen Link: https://lore.kernel.org/r/20230815190136.8987-23-tiwai@suse.de Signed-off-by: Takashi Iwai

ALSA: dmaengine: Fix missing return value comments for kernel docs

2022-07-13T11:42:35+00:00

Each kernel doc comment expects the definition of the return value in a proper format. This patch adds or fixes the missing entries for PCM dmaengine API. Link: https://lore.kernel.org/r/20220713104759.4365-4-tiwai@suse.de Signed-off-by: Takashi Iwai

ASoC: dai_dma: remove slave_id field

2021-12-17T05:53:56+00:00

This field is no longer set from any driver now, so remove the last references as well. Signed-off-by: Arnd Bergmann Acked-by: Mark Brown Link: https://lore.kernel.org/r/20211122222203.4103644-3-arnd@kernel.org Signed-off-by: Vinod Koul

ASoC: dmaengine_pcm: add peripheral configuration

2021-02-05T17:16:41+00:00

The commit e7bbb7acabf4 ("dmaengine: add peripheral configuration") adds peripheral configuration for dma_slave_config. This configuration is useful for some audio peripherals, for example, the peripheral supports multi fifos, we can let the DMA know which fifos are selected. So also add this configuration for snd_dmaengine_dai_dma_data. Signed-off-by: Shengjiu Wang Link: https://lore.kernel.org/r/1612509985-11063-1-git-send-email-shengjiu.wang@nxp.com Signed-off-by: Mark Brown

ASoC: dmaengine_pcm: export soc_component_to_pcm

2020-06-12T13:18:02+00:00

In DPCM case, Front-End needs to get the dma chan which has been requested by Back-End and reuse it. Signed-off-by: Shengjiu Wang Reviewed-by: Nicolin Chen Link: https://lore.kernel.org/r/429c6ae1f3c5b47eb893f475d531d71cdcfe34c0.1591947428.git.shengjiu.wang@nxp.com Signed-off-by: Mark Brown