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

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Date:	Wed, 08 Jun 2016 12:20:45 +0200
From:	joerg Reisenweber <joerg@...nmoko.org>
To:	Felipe Balbi <felipe.balbi@...ux.intel.com>
Cc:	Tony Lindgren <tony@...mide.com>,
	Pali Rohár <pali.rohar@...il.com>,
	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>
Subject: Re: Nokia N900: musb is in wrong state after boot

On Wed 08 June 2016 13:02:00 Felipe Balbi wrote:
> Hi,
> 
> Tony Lindgren <tony@...mide.com> writes:
> > 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
> #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?

(disclaimer: all IIRC) Alas it doesn't, at least for the MentorGraphics MUSB 
in OMAP3.  
We use MUSB_TEST_FORCE_HOST in the H-E-N N900 hostmode hack 
(http://talk.maemo.org/showthread.php?p=696115) and it's really just a test 
thing that doesn't support full hostmode as we know it. 

There is definitely no other way to force the state machine in MUSB core into 
hostmode, than the "ID pin grounded" message from PHY via ULPI bus up to the 
MUSB, whether it's real or *sw-triggered by a command to PHY*.
Shame on the MUSB core design for this.

/jOERG

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