From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S967123AbcAZR0h (ORCPT <rfc822;w@1wt.eu>);
	Tue, 26 Jan 2016 12:26:37 -0500
Received: from muru.com ([72.249.23.125]:57646 "EHLO muru.com"
	rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
	id S966811AbcAZR0f (ORCPT <rfc822;linux-kernel@vger.kernel.org>);
	Tue, 26 Jan 2016 12:26:35 -0500
Date: Tue, 26 Jan 2016 09:26:32 -0800
From: Tony Lindgren <tony@atomide.com>
To: Pali =?utf-8?B?Um9ow6Fy?= <pali.rohar@gmail.com>
Cc: joerg Reisenweber <joerg@openmoko.org>, Felipe Balbi <balbi@ti.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-omap@vger.kernel.org,
        Ivaylo Dimitrov <ivo.g.dimitrov.75@gmail.com>,
        Sebastian Reichel <sre@kernel.org>,
        Aaro Koskinen <aaro.koskinen@iki.fi>, Pavel Machek <pavel@ucw.cz>,
        Nishanth Menon <nm@ti.com>
Subject: Re: Nokia N900: musb is in wrong state after boot
Message-ID: <20160126172631.GZ19432@atomide.com>
References: <201601091616.04193@pali>
 <3690314.8jDXSUDcRZ@saturn>
 <20160121192113.GM19432@atomide.com>
 <8629381.KDSn8v3DtH@saturn>
 <20160121203012.GN19432@atomide.com>
 <20160126143450.GG25796@pali>
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Disposition: inline
Content-Transfer-Encoding: 8bit
In-Reply-To: <20160126143450.GG25796@pali>
User-Agent: Mutt/1.5.24 (2015-08-30)
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

* Pali Rohár <pali.rohar@gmail.com> [160126 06:35]:
> On Thursday 21 January 2016 12:30:13 Tony Lindgren wrote:
> > * joerg Reisenweber <joerg@openmoko.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