Sebastian, On Tue, Aug 13, 2013 at 8:17 AM, Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx> wrote: > On 08/13/2013 03:03 PM, Bin Liu wrote: >> Sebastian, > > Hi Bin, > >>>>> + if (musb->port_mode == MUSB_PORT_MODE_HOST) { >>>>> + val = USBMODE_IDDIG_A; >>>>> + val |= USBMODE_ID_MUX_REG; >>>> >> I am going to so some tests today for this. I don't object to use the >> mode register, but am wondering why we have to play with it for >> host-only mode. The ID pin is grounded for host-only mode, which >> should cause the same as setting mode register. > > I've been looking at the wiki page and it did not mention the ID pin > for the second port. If it is grounded then this piece can be removed I thought you have already tried that without setting the mode register the session bit cannot stay set. I am not sure if anywhere mentioned about the ID pin, but ASAIK all the different boards using am335x have ID pin grounded for host port. > and the magic trick is just to skip the try_idle() call. Agreed. > > I haven't found anything saying that it is required to clear the > session bin in host mode, only in OTG. And then, I would assume to Agreed. > receive a session interrupt once we have the proper VBUS level which > does not happen. The TI 3.2 kernel for am335x sets the session bit in musb_start() for host-only mode. Maybe we can do something similar in here? (I noticed mush_start() has gone in mainline, but have not got a chance to check the details...) > >> -Bin. > > 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