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

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Date:	Wed, 8 Jun 2016 15:32:24 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	joerg Reisenweber <joerg@...nmoko.org>
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 6/8/2016 3:18 PM, joerg Reisenweber wrote:

>>>>>> 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.

    Yeah, the MUSB PG says the same.

[...]

> /j

MBR, Sergei