&ehci->regs->port_status[0] bf070084
ehci->regs->port_status[0] 1813
ehci_port_status: PORT_CONNECT
###step1.2### 2 usb_hcd_poll_rh_status 


 ###step2###2 usb_hcd_poll_rh_status  msgq 2  hcd->bus 80abd4e0


 ###step3### msg.event 2
&ehci->regs->port_status[0] bf070084
ehci->regs->port_status[0] 1813
ehci_port_status: PORT_CONNECT
USB @2 start enumerate ports1000ffff 
hub_add_new_dev 80d26e00
port_reset 80abbfe0
&ehci->regs->port_status[0] bf070084
ehci->regs->port_status[0] 8001215
###step1.2### 0 usb_hcd_poll_rh_status 
   #3    usb_kill_urb
give reject sema cnt[0] sem 80a01860 
device ADD cost 130 ts