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

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Message-ID: <20160121084007.GN7192@pali>
Date:	Thu, 21 Jan 2016 09:40:07 +0100
From:	Pali Rohár <pali.rohar@...il.com>
To:	Tony Lindgren <tony@...mide.com>
Cc:	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>,
	joerg Reisenweber <joerg@...nmoko.org>
Subject: Re: Nokia N900: musb is in wrong state after boot

On Tuesday 19 January 2016 12:33:15 Tony Lindgren wrote:
> Hi,
> 
> * Pali Rohár <pali.rohar@...il.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@...il.com