From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1425162AbcFHMca (ORCPT <rfc822;w@1wt.eu>);
	Wed, 8 Jun 2016 08:32:30 -0400
Received: from mail-lf0-f50.google.com ([209.85.215.50]:34025 "EHLO
	mail-lf0-f50.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1161602AbcFHMc1 (ORCPT
	<rfc822;linux-kernel@vger.kernel.org>);
	Wed, 8 Jun 2016 08:32:27 -0400
Subject: Re: Nokia N900: musb is in wrong state after boot
To: joerg Reisenweber <joerg@openmoko.org>
References: <201601091616.04193@pali> <87h9d49exz.fsf@linux.intel.com>
 <71cb45ec-a269-d510-df34-eb6eaa781da8@cogentembedded.com>
 <17243006.AtPKaaqTIG@saturn>
Cc: Felipe Balbi <felipe.balbi@linux.intel.com>,
        Tony Lindgren <tony@atomide.com>,
        =?UTF-8?Q?Pali_Roh=c3=a1r?= <pali.rohar@gmail.com>,
        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: <36fb7207-41ed-5ea5-f6f3-d1dd1552bfaa@cogentembedded.com>
Date: Wed, 8 Jun 2016 15:32:24 +0300
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:45.0) Gecko/20100101
 Thunderbird/45.1.1
MIME-Version: 1.0
In-Reply-To: <17243006.AtPKaaqTIG@saturn>
Content-Type: text/plain; charset=windows-1252; format=flowed
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

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