Hello Hans, On 04.02.2015 09:08, Hans Verkuil wrote: > I remain very skeptical about the use of dma-contig (or dma-sg for that > matter). Have you tried using vmalloc and check if the USB core isn't > automatically using DMA transfers for that? > > Basically I would like to see proof that vmalloc is not an option before > allowing dma-contig (or dma-sg if you can figure out why that isn't > working). > > You can also make a version with vmalloc and I'll merge that, and then > you can look more into the DMA issues. That way the driver is merged, > even if it is perhaps not yet optimal, and you can address that part later. OK, that sounds sensible, I will try that route. When using videobuf2-vmalloc, what do I pass back for alloc_ctxs in queue_setup?
Best, Florian -- SENT FROM MY DEC VT50 TERMINAL
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