On Mon, 7 Aug 2006, rakesh kn wrote: > In function rh_call_control , there is no support for > HUB_CLEAR_TT_BUFFER hub request.
No. This is because rh_call_control handles only requests that are common to all root hubs. Since most root hubs don't support HUB_CLEAR_TT_BUFFER, neither does rh_call_control. > Suppose if we are connecting low/full speed devices to a USB 2.0 EHCI > , host controller., through a HUB , which has a transaction translator > . Then the following function "usb_hub_tt_clear_buffer" will be called > from the function "qtd_copy_status" in the file ehci-q.c .. in case > of errors in CSPILT transaction . > > But since this is a hub-transaction request... the function > "rh_call_control" , is not implementing the request type > HUB_CLEAR_TT_BUFFER. > > Please explain why is this. Is the hub requests for external hubs > handled elsewhere. Of course it is. It is sent to the external hub and handled there. > Also why is that the TT hub contents not cleared if the EHCI > controller has an embedded Transcation translator ,, as is evident > from the following code in the function qtd_copy_status. I don't know. You should ask the person who developed the embedded TT support for EHCI. Alan Stern ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
