linux-kernel - Re: Nokia N900: musb is in wrong state after boot

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Date:	Tue, 26 Jan 2016 09:26:32 -0800
From:	Tony Lindgren <tony@...mide.com>
To:	Pali Rohár <pali.rohar@...il.com>
Cc:	joerg Reisenweber <joerg@...nmoko.org>,
	Felipe Balbi <balbi@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-omap@...r.kernel.org,
	Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>,
	Sebastian Reichel <sre@...nel.org>,
	Aaro Koskinen <aaro.koskinen@....fi>,
	Pavel Machek <pavel@....cz>, Nishanth Menon <nm@...com>
Subject: Re: Nokia N900: musb is in wrong state after boot

* Pali Rohár <pali.rohar@...il.com> [160126 06:35]:
> On Thursday 21 January 2016 12:30:13 Tony Lindgren wrote:
> > * joerg Reisenweber <joerg@...nmoko.org> [160121 11:35]:
> > > On Thu 21 January 2016 11:21:13 Tony Lindgren wrote:
> > > > Do you have some pointer
> > > > to the "certain resistor value on ID to GND" spec? Is it maybe part of
> > > > the carkit related parts of the USB spec?
> > > 
> > > ""Three additional ID pin states are defined[4] at the nominal resistance 
> > > values of 124 kΩ, 68 kΩ, and 36.5 kΩ, with respect to the ground pin. These 
> > > permit the device to work with USB Accessory Charger Adapters that allows the 
> > > OTG device to be attached to both a charger and another device simultaneously.
> > > [6]""
> > > https://en.wikipedia.org/wiki/USB_On-The-Go#OTG_micro_plugs
> > 
> > OK thanks. So it's the "accessory charger" part of the
> > battery charging specification 1.1.
> 
> So, Tony, do you have some idea what needs to be changed and how to fix
> peripheral mode after boot on Nokia N900?

No, I'm waiting to hear an educated guess from Felipe on this one.

> First I would like to have fully working peripheral mode on Nokia N900
> and then we can try to hack host mode (if possible).
> 
> But peripheral mode is a must due to development, because it provides
> usb network or usb tty.

Totally.

Regards,

Tony