On Tue, Nov 25, 2014 at 01:56:38AM +0100, Ricardo Ribalda Delgado wrote: > Hello > > I cannot make work the parameter use_dma_chaining with g_mass_storage > and a usb3380 device. The initial enumeration works, but after a > couple of frames the enumeration is restarted. If I compare usbmon > with and without the parameter I can see that the device fails to > reply to the host. > > While going through the code I realized that there is only on scathe > gather descriptor per endpoint and I wonder how can you make work a > dma_chain with only one descriptor!. > > I think the driver is expecting a special pattern of execution or > maybe (probably) I am not understanding the code right. > > Can somebody confirm that this parameter works on a net2280, and if > not, can I remove the obsolete code, so no other person loses some > hours and gray hair :) ? might be better if you can fix the code, instead. We have a "better" scatter-gather support in the framework itself. UDC needs to set gadget->sg_supported and a pointer to the sg should be passed in by the gadget driver through usb_request->sg. cheers -- balbi
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