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

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Date:	Thu, 9 Jun 2016 16:09:48 -0500
From:	Bin Liu <b-liu@...com>
To:	Felipe Balbi <felipe.balbi@...ux.intel.com>
CC:	Tony Lindgren <tony@...mide.com>,
	Pali Rohár <pali.rohar@...il.com>,
	joerg Reisenweber <joerg@...nmoko.org>,
	Felipe 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

Hi,

On Wed, Jun 08, 2016 at 01:02:00PM +0300, Felipe Balbi wrote:
> 
> Hi,
> 
> Tony Lindgren <tony@...mide.com> writes:
> > * Pali Rohár <pali.rohar@...il.com> [160607 05:53]:
> >> > Tony, what do you think about that patch?
> >> > 
> >> 
> >> Tony, PING
> >
> > Yeah I don't know, AFAIK we don't have a generic way to
> > force MUSB to change mode without ID pin. If you have figured
> > something generic for that which does not actually tinker with
> > the PHY registers directly, that should be the generic
> > musb_set_mode() that we've been wondering about for years.
> 
> #define MUSB_TEST_FORCE_HOST	0x80
> 
> Can someone confirm on MUSB's docs (and actual running system) that this
> does what's supposed to do?

I don't know what to expect while setting this bit. I am never able to get musb
to enumerate anything or does anything which a host suppose to do.

Regards,
-Bin.