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authorPaul Cercueil <paul@crapouillou.net>2018-08-29 23:32:47 +0200
committerVinod Koul <vkoul@kernel.org>2018-09-11 12:59:26 +0530
commit5eed7d84bcc0fac063e7c4cbd3ffc9990268049d (patch)
tree46fcb44d60ee5dcb62d4bbb3a510d64e1ba89727 /CREDITS
parent33633583a23aff572ff6b46a6bc57808b9c9872e (diff)
dmaengine: dma-jz4780: Use 4-word descriptors
The only information we use in the 8-word version of the hardware DMA descriptor that is not present in the 4-word version is the transfer type, aka. the ID of the source or recipient device. Since the transfer type will never change for a DMA channel in use, we can just set it once for all in the corresponding DMA register before starting any transfer. This has several benefits: * the driver will handle twice as many hardware DMA descriptors; * the driver is closer to support the JZ4740, which only supports 4-word hardware DMA descriptors; * the JZ4770 SoC needs the transfer type to be set in the corresponding DMA register anyway, even if 8-word descriptors are in use. Signed-off-by: Paul Cercueil <paul@crapouillou.net> Tested-by: Mathieu Malaterre <malat@debian.org> Reviewed-by: PrasannaKumar Muralidharan <prasannatsmkumar@gmail.com> Signed-off-by: Vinod Koul <vkoul@kernel.org>
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