On 07/26/2013 08:17 PM, Bin Liu wrote: Hi Bin. >> In TI 3.2 kernel, the otg_timer() toggles the SESSION bit in >> OTG_STATE_B_IDLE state. So whenever the ID pin is grounded by >> connecting a device, the controller will try go into host mode. >> But I have no idea why your board is in a_idle not b_idle. The toggle >> does not handle a_idle. >> >> Do you use the AM335x GP EVM, not the smaller StarterKit EVM, right? >> the USB0 port on SK EVM is device only. >> >> But anyway, I have not seen any use case which uses micro-AB >> receptacle and requires such dynamic role switching. So I kind of > > I meant the real customer use cases, not the EVMs ;) > I am using the about the second port on am335x evm which is used as host (not OTG mode (3) but HOST (1)). If I start the timer OTG after disconnect I see that it gets back to A mode: [ 97.570852] musb-hdrc musb-hdrc.1.auto: Poll devctl 19 (a_wait_bcon) [ 99.570306] musb-hdrc musb-hdrc.1.auto: Poll devctl 98 (a_idle) … [ 209.570259] musb-hdrc musb-hdrc.1.auto: Poll devctl 80 (a_idle) and now the session bit is missing and never gets back so I can not plug any other device. I really have no idea what is missing here… Sebastian -- 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
