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Subject: Re: Nokia N900: musb is in wrong state after boot
To: Felipe Balbi <felipe.balbi@linux.intel.com>,
        Tony Lindgren <tony@atomide.com>,
        =?UTF-8?Q?Pali_Roh=c3=a1r?= <pali.rohar@gmail.com>
References: <201601091616.04193@pali> <3690314.8jDXSUDcRZ@saturn>
 <20160121192113.GM19432@atomide.com> <201601231357.32629@pali>
 <20160529103824.GM29844@pali> <20160607125044.GI29844@pali>
 <20160608095321.GH22406@atomide.com> <87h9d49exz.fsf@linux.intel.com>
Cc: joerg Reisenweber <joerg@openmoko.org>, Felipe Balbi <balbi@ti.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-omap@vger.kernel.org,
        Ivaylo Dimitrov <ivo.g.dimitrov.75@gmail.com>,
        Sebastian Reichel <sre@kernel.org>,
        Aaro Koskinen <aaro.koskinen@iki.fi>, Pavel Machek <pavel@ucw.cz>,
        Nishanth Menon <nm@ti.com>
From: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Message-ID: <71cb45ec-a269-d510-df34-eb6eaa781da8@cogentembedded.com>
Date: Wed, 8 Jun 2016 15:04:02 +0300
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On 6/8/2016 1:02 PM, Felipe Balbi wrote:

>> * Pali Rohár <pali.rohar@gmail.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