Messages in this thread | | | Date | Tue, 19 May 2015 23:09:36 +0100 | From | Russell King - ARM Linux <> | Subject | Re: [RFC] arm: DMA-API contiguous cacheable memory |
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On Wed, May 20, 2015 at 12:05:54AM +0200, Lorenzo Nava wrote: > Maybe my interpretation of dma_alloc_coherent() is not correct, and > the coherency can be managed using the dma_sync_single_for_* functions > and it doesn't require hardware mechanism.
dma_sync_single_for_* are only for use with the streaming DMA API, where you must have already mapped the buffer using one of the dma_map_* functions. Anything other than that is abusing the API.
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