Hi, > Hi, > > On Thu, Dec 19, 2013 at 02:54:31PM +0900, Anton Tikhomirov wrote: > > > WARN_ON(ret < 0); > > > > > > Regards > > > Pratyush > > > > By the way, chaining additional (auxiliary) TRB would allow complying > with > > Buffer Size Rule on _UDC_driver_level_ for any type of OUT endpoints, > when > > total size of a Buffer Descriptor must be a multiple of MaxPacketSize: > > > > rem = request_length % MaxPacketSize > > > > general TRB size = request_length (CHN = 1) > > should be request_length - rem > > > aux TRB size = MaxPacketSize - rem (CHN = 0) > > should be rem In this case: Buffer_Descriptor_size = general_TRB_size + aux_TRB_size = (request_lenth - rem) + rem = request_length , which is not multiple of MaxPacketSize. The idea is to build Buffer Descriptor, whose total size is multiple of MaxPacketSize, using additional TRB. > > > Buffer for aux TRBs can be allocated at initialization time and used > > when necessary. > > send a patch and test it for weeks ;-) > > -- > Balbi Thanks -- 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
