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Date: Thu, 21 Jan 2016 09:40:07 +0100
From: Pali =?utf-8?B?Um9ow6Fy?= <pali.rohar@gmail.com>
To: Tony Lindgren <tony@atomide.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>, joerg Reisenweber <joerg@openmoko.org>
Subject: Re: Nokia N900: musb is in wrong state after boot
Message-ID: <20160121084007.GN7192@pali>
References: <201601091616.04193@pali>
 <20160119203314.GE19432@atomide.com>
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On Tuesday 19 January 2016 12:33:15 Tony Lindgren wrote:
> 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?

I do not know now. I tried to find it in N900 schemantics, but do not
see it.

CCing Joerg, do you know?

> 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 looked at that code, but do not see what and how can be fixed :-(

> 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

-- 
Pali Rohár
pali.rohar@gmail.com