On Thu, Dec 19, 2013 at 03:38:18PM +0900, Anton Tikhomirov wrote: > 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 multiple of packet size thing is only for RX and in this case, he's sending data (a config descriptor) to host. -- balbi
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