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dmaengine: Document dmaengine_prep_dma_memset

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Document this function to make clear the expected behavior of the
'value' parameter. It was intended to match the behavior of POSIX memset
as laid out here:

https://lore.kernel.org/dmaengine/YejrA5ZWZ3lTRO%2F1@matsya/

Signed-off-by: Ben Walker <benjamin.walker@intel.com>
Link: https://lore.kernel.org/r/20220301182551.883474-2-benjamin.walker@intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Ben Walker 2022-03-01 11:25:48 -07:00 • committed by Vinod Koul
parent 439b5e765a
commit fc44ff0ae9
2 changed files with 14 additions and 0 deletions
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8
include/linux/dmaengine.h
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@ -1030,6 +1030,14 @@ static inline struct dma_async_tx_descriptor *dmaengine_prep_interleaved_dma(
return chan->device->device_prep_interleaved_dma(chan, xt, flags);
}
/**
* dmaengine_prep_dma_memset() - Prepare a DMA memset descriptor.
* @chan: The channel to be used for this descriptor
* @dest: Address of buffer to be set
* @value: Treated as a single byte value that fills the destination buffer
* @len: The total size of dest
* @flags: DMA engine flags
*/
static inline struct dma_async_tx_descriptor *dmaengine_prep_dma_memset(
struct dma_chan *chan, dma_addr_t dest, int value, size_t len,
unsigned long flags)