On Thu, May 15, 2014 at 05:53:53PM +0100, Liviu Dudau wrote: > On Thu, May 15, 2014 at 04:36:25PM +0100, Alan Stern wrote: > > On Thu, 15 May 2014, Liviu Dudau wrote: > > > On Thu, May 15, 2014 at 03:11:48PM +0100, Alan Stern wrote: > > > > On Wed, 14 May 2014, Mark Brown wrote: > > > > > arm64 architecture handles correctly 64bit DMAs and can enable support > > > > > for 64bit EHCI host controllers. > > > > > > > > Did you folks tested this for all sorts of host controllers? I have no > > > > way to verify that it works, and last I heard, many (or even most) > > > > controllers don't work right with 64-bit DMA. > > > > > > I have tested it with a host controller that is capable of 64-bit DMA and > > > without this change it doesn't work. > > > > What do you mean it doesn't work? Can't the host controller use 32-bit > > DMA? > > It could if arm64 would restrict the DMA addresses to 32-bit, but it doesn't > and I end up on my platform with USB DMA buffers allocated >4GB address.
dma_alloc_coherent() on arm64 should return 32-bit addresses if the coherent_dma_mask is set to 32-bit. Which kernel version is this? -- Catalin -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
