snd_dmaengin...slave_config(9)

✨ snd_dmaengine_pcm_prepare_slave_config ✨

okay so bestie, this is page snd_dmaengin...slave_config(9) from the Kernel API Manual — yes the title is literally truncated with ellipsis in the header, that's just how the man page do, we don't fix it, we love it 💅

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🎀 NAME 🎀

snd_dmaengine_pcm_prepare_slave_config — the generic prepare_slave_config callback, no cap. It's giving "one callback to rule them all" energy 👑

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🌸 SYNOPSIS 🌸

int snd_dmaengine_pcm_prepare_slave_config (struct snd_pcm_substream
*substream , struct snd_pcm_hw_params *params , struct dma_slave_config
*slave_config );

literally three pointers in, one int out. slay. ✨

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🦋 ARGUMENTS 🦋

• substream — the PCM substream, bestie. that's the one.
• params — the hw_params. the hardware params. the vibe check for your audio 💖
• slave_config — the DMA slave config that we're about to prepare 🎀

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💜 DESCRIPTION 💜

okay so here's the tea ☕ — this function is your go-to generic prepare_slave_config callback for any platform that's using the snd_dmaengine_dai_dma_data struct for its DAI DMA data. iykyk.

internally it's a two-step serve, and honestly? iconic:

1. it first calls snd_hwparams_to_dma_slave_config to fill in the slave config based on the hw_params 🔥
2. then it calls snd_dmaengine_pcm_set_config_from_dai_data to fill in the remaining fields based on the DAI DMA data 🌈

like, fill in some, fill in the rest — main character energy from start to finish fr fr.

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👑 SEE ALSO 👑

• Kernel file ./sound/soc/soc-generic-dmaengine-pcm.c 💖
• snd_dmaengine_pcm_register(9)
• snd_dmaengine_pcm_unregister(9)

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ngl if you're implementing a platform and you've got snd_dmaengine_dai_dma_data sitting there, this callback is literally made for you. go off 🫶

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and that's the whole page, bestie — sourced from ./sound/soc, dated October 2026, stamped with snd_dmaengin...slave_config(9) at the top and bottom. mwah 💋 bye ily 🧚‍♀️💜