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

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Date:	Wed, 08 Jun 2016 14:18:03 +0200
From:	joerg Reisenweber <joerg@...nmoko.org>
To:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Cc:	Felipe Balbi <felipe.balbi@...ux.intel.com>,
	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 15:04:02 Sergei Shtylyov wrote:
> On 6/8/2016 1:02 PM, Felipe Balbi wrote:
> >> * 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?
> 
>     The MUSB programmer's guide says the CID (sic) input is ignored when the
> Force_Host bit is set. The host mode is entered when the Session bit is
> set. But I don't have a MUSB hardware readily available to confirm.
> 
> MBR, Sergei

also says:

While the FORCE_HOST bit remains set, the core will enter Host mode when the 
Session bit is set and **remain in Host mode until the Session bit is cleared 
even if a connected device is disconnected during the session.** 
The operating speed while in this mode **is determined for the setting of the 
FORCE_HS and FORCE_FS bits of the Testmode register** in Section 23.1.4.11.

see http://talk.maemo.org/showthread.php?p=685367

It's not any fully operational hostmode.

/j
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