Hi Florian, On Wednesday 04 February 2015 11:56:58 Florian Echtler wrote: > On 04.02.2015 11:22, Hans Verkuil wrote: > > On 02/04/15 11:08, Florian Echtler wrote: > >> On 04.02.2015 09:08, Hans Verkuil wrote: > >>> 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. > > That's what I assumed, however, I'm running into the same problem as > with dma-sg when I switch to vmalloc...? I don't expect vmalloc to work, as you can't DMA to vmalloc memory directly without any IOMMU in the general case (the allocated memory being physically fragmented). dma-sg should work though, but you won't be able to use usb_bulk_msg(). You need to create the URBs manually, set their sg and num_sgs fields and submit them. > I've sent a "proper" patch submission again, which has all the other > issues from the previous submission fixed. I'm hoping you can maybe have > a closer look and see if I'm doing anything subtly wrong which causes > both vmalloc and dma-sg to fail while dma-contig works. -- Regards, Laurent Pinchart -- 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
