On 02/04/15 11:08, Florian Echtler wrote: > 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? vmalloc doesn't need those, so you can just drop any alloc_ctx related code. Regards, Hans -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
