dmaengine: dw-edma: Move control field update of DMA link to the last step

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The control field in a DMA link list entry must be updated as the final
step because it includes the CB bit, which indicates whether the entry is
ready. Add dma_wmb() to ensure the correct memory write ordering.

Currently the driver does not update DMA link entries while the DMA is
running, so no visible failure occurs. However, fixing the ordering now
prepares the driver for supporting link entry updates during DMA operation.

Tested-by: Koichiro Den <den@valinux.co.jp>
Tested-By: Devendra Verma <devendra.verma@amd.com>
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20260713-edma_ll-v7-1-6fb7498c901e@nxp.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

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Frank Li 2026-07-13 13:03:19 -04:00 • committed by Vinod Koul

parent bf1af4dfdc

commit 99c46385ed

2 changed files with 12 additions and 8 deletions

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10

drivers/dma/dw-edma/dw-edma-v0-core.c

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10

drivers/dma/dw-edma/dw-hdma-v0-core.c

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