On Mon 2019-09-02 11:23:44, Pavel Machek wrote:
> Hi!
> 
> > So I ended up cleaning up omap2430 glue layer a bit for host mode with the
> > various reproducable errors I was seeing docking droid4 to a lapdock. There
> > are a few fixes, and then we end up removing all the devctl register tinkering
> > for omap2430 glue layer.
> 
> I should have your recent patches up-to [PATCH] power: supply:
> cpcap-charger: Enable vbus boost voltage applied to linux-next, -0830.
> 
> So... to get usb host to work even with stock kernel, I need a hub and
> external power... and "right" cable between phone and hub.
> 
> When I plugged/unplugged it several times, I got
> 
> ### usb unplug:
> musb-hdrc.0.auto: musb_set_peripheral: already in peripheral mode: 80
> musb-hdrc.0.auto: musb_set_peripheral: already in peripheral mode: 80
> ub0: stop stats: rx/tx 0/0, errs 0/0
> l3_init_cm:clk:0040:0: failed to disable
> l3_init_cm:clk:00c0:0: failed to disable
> ### usb plug produces nothing
> ### usb unplug:
> musb-hdrc.0.auto: musb_set_peripheral: already in peripheral mode: 80
> musb-hdrc.0.auto: musb_set_peripheral: already in peripheral mode: 80
> 
> Hmm. I did it two more times, and now machine rebooted, and USB was
> powered from the phone for a while (3.6V).
> 
> And I reproduced the crash on the next boot.
> 
> Is there anything I may be missing in .config?

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

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 :-).

								Pavel
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