kernel.git/sound/core/pcm_dmaengine.c, branch linux-rolling-stable

ASoC: dmaengine_pcm: Add port_window_size to DAI dma data struct

2025-08-10T20:09:12Z

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

2025-05-05T10:36:29Z

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: pcm_dmaengine: Don't synchronize DMA channel when DMA is paused

2024-07-17T08:39:47Z

When suspended, the DMA channel may enter PAUSE state if dmaengine_pause() is supported by DMA. At this state, dmaengine_synchronize() should not be called, otherwise the DMA channel can't be resumed successfully. Fixes: e8343410ddf0 ("ALSA: dmaengine: Synchronize dma channel after drop()") Signed-off-by: Shengjiu Wang Cc: Link: https://patch.msgid.link/1721198693-27636-1-git-send-email-shengjiu.wang@nxp.com Signed-off-by: Takashi Iwai

Merge branch 'for-linus' into for-next

2024-06-26T20:11:13Z

Signed-off-by: Takashi Iwai

Merge tag 'asoc-fix-v6.10-rc5' of https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound into for-linus

2024-06-26T20:02:55Z

ASoC: Fixes for v6.10 A relatively large batch of updates, largely due to the long interval since I last sent fixes due to various travel and holidays. There's a lot of driver specific fixes and quirks in here, none of them too major, and also some fixes for recently introduced memory safety issues in the topology code.

ALSA: pcm_dmaengine: Unify two close functions

2024-06-25T11:34:25Z

Both snd_dmaengine_pcm_close() and snd_dmaengine_pcm_close_release_chan() are almost identical except for a call of dma_release_channel() in the latter. For code simplification, unify them internally. Just a code refactoring, and no functional changes. Link: https://patch.msgid.link/20240625113356.2123-1-tiwai@suse.de Signed-off-by: Takashi Iwai

ALSA: dmaengine_pcm: terminate dmaengine before synchronize

2024-06-25T09:55:45Z

When dmaengine supports pause function, in suspend state, dmaengine_pause() is called instead of dmaengine_terminate_async(), In end of playback stream, the runtime->state will go to SNDRV_PCM_STATE_DRAINING, if system suspend & resume happen at this time, application will not resume playback stream, the stream will be closed directly, the dmaengine_terminate_async() will not be called before the dmaengine_synchronize(), which violates the call sequence for dmaengine_synchronize(). This behavior also happens for capture streams, but there is no SNDRV_PCM_STATE_DRAINING state for capture. So use dmaengine_tx_status() to check the DMA status if the status is DMA_PAUSED, then call dmaengine_terminate_async() to terminate dmaengine before dmaengine_synchronize(). Signed-off-by: Shengjiu Wang Link: https://patch.msgid.link/1718851218-27803-1-git-send-email-shengjiu.wang@nxp.com Signed-off-by: Takashi Iwai

ALSA: dmaengine: Synchronize dma channel after drop()

2024-06-11T16:13:31Z

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

ALSA: pcm_dmaengine: Add missing module description

2024-05-09T08:13:07Z

Now that make W=1 starts complaining the lack of MODULE_DESCRIPTION(), let's add the missing information. Reported-by: Andy Shevchenko Closes: https://lore.kernel.org/r/ZjpQm-hxLQtpgkUx@smile.fi.intel.com Signed-off-by: Takashi Iwai Reviewed-by: Andy Shevchenko Reviewed-by: Dragan Simic Link: https://lore.kernel.org/r/20240508091128.25274-4-tiwai@suse.de

ALSA: dmaengine: increment buffer pointer atomically

2022-09-27T06:55:05Z

Setting pointer and afterwards checking for wraparound leads to the possibility of returning the inconsistent pointer position. This patch increments buffer pointer atomically to avoid this issue. Fixes: e7f73a1613567a ("ASoC: Add dmaengine PCM helper functions") Signed-off-by: Andreas Pape Signed-off-by: Eugeniu Rosca Link: https://lore.kernel.org/r/1664211493-11789-1-git-send-email-erosca@de.adit-jv.com Signed-off-by: Takashi Iwai