dmaengine: Add API to combine configuration and preparation (sg and single)

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Previously, configuration and preparation required two separate calls. This
works well when configuration is done only once during initialization.

However, in cases where the burst length or source/destination address must
be adjusted for each transfer, calling two functions is verbose and
requires additional locking to ensure both steps complete atomically.

Add a new API dmaengine_prep_config_single() and dmaengine_prep_config_sg()
and callback device_prep_config_sg() that combines configuration and
preparation into a single operation. If the configuration argument is
passed as NULL, fall back to the existing implementation.

Tested-by: Niklas Cassel <cassel@kernel.org>
Acked-by: Manivannan Sadhasivam <mani@kernel.org>
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20260521-dma_prep_config-v7-1-1f73f4899883@nxp.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

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Frank Li 2026-05-21 11:32:47 -04:00 • committed by Vinod Koul

parent dc59e4fea9

commit 796bdb33e8

2 changed files with 64 additions and 8 deletions

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9

Documentation/driver-api/dmaengine/client.rst

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63

include/linux/dmaengine.h

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