* Pavel Machek <pavel@xxxxxxx> [190902 09:44]: > On Mon 2019-09-02 11:23:44, Pavel Machek wrote: > Hmm. I guess CONFIG_USB_MUSB_DUAL_ROLE=y might be useful. > > And now... if I unplug/replug the usb after the boot, USB hub and > mouse are recognized. Good! > > Less than minute later: > > mmusb-hdrc.0.auto: Babble > USB disconnect The babble is most likely caused by some kind of signaling issue. > I unplug, replug usb (not at the phone, between hub and dongle, and > green LED indincating charging starts blinking rapidly. > > cpcap-core spi0.0: EOT timed out. > > I try plug/replug, and now green led is on. > > I unplug replug at the phone, and get bunch more of messages: > > musm _set_peripheral: already in peripheral mode: 99 > musm _set_peripheral: already in peripheral mode: 81 > musm _set_peripheral: already in peripheral mode: 81 > > musb_set_host: could not set host: 99 > musb_set_host: could not set host: 99 > musb_set_host: could not set host: 99 > musb_set_host: could not set host: 99 > musb_set_host: could not set host: 99 > musb_set_host: could not set host: 99 > musb_set_host: could not set host: 99 > musb_set_host: could not set host: 99 > > Unplug/replug at host, and again, hub+mouse is detected. > > I unplug power connected to one of USB hub's ports... and find out > that phone was _not_ powering it. > > Ok... so something somehow works.... sometimes :-). My guess is you're missing a USB micro-B cable with ID pin grounded, with that things should just work automagically. So no need for hubs feeding back VBUS and no need to try to force host mode via sysfs unlike on n900. Regards, Tony
