Ping. > -----Original Message----- > > I am trying to investigate an issue on a TI Sitara CPU, AM3352 with the musb > USB controller. > > The scenario is that a device has been in use and working correctly. The > device is an Android device and is presenting as an MTP device. That first > session of use is finished and the port is reset but the device is not > unplugged, so enumeration and configuration starts again the next time it is > needed. The transfers over EP0 using PIO all proceed as expected. The > problem is the first bulk packet sent to EP1, which also happens to be the > first dma packet. USBMON shows this packet as being sent. However a > hardware analyser does not show this packet on the wire and of course > there is no ACK either. Looking at the debug info from the musb driver I can > see the dma being started and then the callback being called. > MUSB_TXCSR_TXPKTRDY remains set as does > MUSB_TXCSR_TXFIFONOTEMPTY so nothing else happens. The TXCSR > register is 0x3403. The code is waiting for MUSB_TXCSR_TXPKTRDY to be > cleared but that will not happen until an ACK is received. It just seems that > the controller is not putting the packet onto the wire for some reason. > > This is on 4.5.1. > > I would welcome some pointers on how to proceed to debug this or else any > information on possible applicable errata and workarounds for this. > > Thanks, > Andrew -- 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
