> From: dinguyen@xxxxxxxxxx [mailto:dinguyen@xxxxxxxxxx] > Sent: Monday, May 05, 2014 3:23 PM > > Even though the IP supports Descriptor DMA mode, it does not support SPLIT > transactions in this mode. Since the driver can get the Descriptor DMA mode > support from hardware, the driver in its currently form cannot fully support > LS/FS devices connected to a HS Hub when Descriptor DMA mode is enabled in the > driver. Thus, we give the option to disable Descriptor DMA from device tree. Hi Dinh, Instead of this patch, how about if we make the driver default to buffer DMA mode instead, and if anyone wants to use descriptor DMA mode, they can add a DT property for that? I don't think anyone will want that, since as you say it doesn't fully support LS/FS devices in that mode. The driver originally worked like that. I guess the default got changed by one of Matthijs' patches, and I didn't notice it. -- Paul -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
