dma_handle is a output parameter. When dma_alloc_coherent returns, the
return value is the virtual address of the memory malloced and the
dma_handle is the DMA address of it. You may need to pass it to your
device register.
jeyram jadenthradevan 写道:
hello every one,
void *dma_alloc_coherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, int flag);
here what is the usage of dma_handle ?
thank you.
-jeyram
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