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Date: Tue, 19 Jan 2016 12:33:15 -0800
From: Tony Lindgren <tony@atomide.com>
To: Pali =?utf-8?B?Um9ow6Fy?= <pali.rohar@gmail.com>
Cc: 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: <20160119203314.GE19432@atomide.com>
References: <201601091616.04193@pali>
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Hi,

* Pali Rohár <pali.rohar@gmail.com> [160109 07:16]:
> Hello,
> 
> when I boot 4.4.0-rc7+ kernel compiled with g_nokia into zImage on Nokia 
> N900 into userspace then usb gadget (g_nokia) does not work. Notebook, 
> connected on other side does not see any usb device... Connecting and 
> disconnecting cable does not change anything, still not work.
> 
> But if I run this command
> $ echo peripheral > /sys/bus/platform/devices/musb-hdrc.0.auto/mode 

> 
> then gadget starts working. Other side see usb device and can use it. 
> Also connecting and disconnecting usb cable working fine. After 
> connecting it again, usb device OK.

N900 had the PHY interrupt wired to the bq chip instead of twl4030, right?

You can fix this issue similar to phy-twl4030-usb.c. In function
twl4030_phy_power_on() we call schedule_delayed_work() that checks
the state of the ID pin on boot up.

I think that's only needed for the i2c based PHY's with MUSB, with
the others the USB driver has a better idea of the current state.

Regards,

Tony