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

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Message-ID: <71cb45ec-a269-d510-df34-eb6eaa781da8@cogentembedded.com>
Date:	Wed, 8 Jun 2016 15:04:02 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Felipe Balbi <felipe.balbi@...ux.intel.com>,
	Tony Lindgren <tony@...mide.com>,
	Pali Rohár <pali.rohar@...il.com>
Cc:	joerg Reisenweber <joerg@...nmoko.org>,
	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 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