hi Andiry: 2012/9/3 Andiry Xu <and...@gmail.com>: > On Wed, Aug 29, 2012 at 6:53 AM, loody <milo...@gmail.com> wrote: >> hi all: >> I saw there are 2 trbs about bandwidth as below: >> >> #define TRB_GET_BW 21 >> #define TRB_BANDWIDTH_EVENT 35 >> >> Would any one tell me where I can see driver use these 2 trbs for >> bandwidth checking, >> since I cannot grep the implementation in the driver. >> > > It's defined by xHCI spec but currently not used by driver. They're > less important. from the protocol type, it seems to implement split transaction. if it is, when I plug a HS hub with FS device on its downstream ports, the driver need these packets to know whether it is ok to schedule traffic for this device. If I guest wrong, please let me know.
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