> From: linux-usb-owner@xxxxxxxxxxxxxxx [mailto:linux-usb-owner@xxxxxxxxxxxxxxx] On Behalf Of Dinh Nguyen > Sent: Monday, July 28, 2014 5:53 AM > > On Mon, 2014-07-28 at 15:05 +0800, Roy wrote: > > Hi Dinh: > > > > Do you think it might be a problem of a un-aligned DMA buffer > > address? We know that the usbnet driver submits lots of URBs with a > > 2-byte aligned buffer address. But in Buffer DMA mode, the starting DMA > > address must be DWORD-aligned, only if turn on Descriptor DMA mode this > > this 4-byte aligned limit disappear. We met this kind of problem in our > > platform which powered by a arm based SoC, RK3288, using the DWC_OTG > > 3.10a usb IP. > > > > > > Yes, I think this is the issue. But even in decscriptor DMA mode the > USB/ethernet is only able to get an IP address from DHCP, pings sometime > work and when pings work, it is extremely slow. I still cannot mount an > NFS using a the adapter. > > Does it work perfectly for you? Would you care to share a patch? The driver is supposed to handle non-aligned data buffers. Look for the use of 'chan->align_buf' and 'qh->dw_align_buf' in the driver. -- Paul ��.n��������+%������w��{.n�����{���)�� jg��� �����ݢj����G���� ���j:+v���w�m������w�������h�����٥
