From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sergei Shtylyov Subject: Re: Nokia N900: musb is in wrong state after boot Date: Wed, 8 Jun 2016 15:32:24 +0300 Message-ID: <36fb7207-41ed-5ea5-f6f3-d1dd1552bfaa@cogentembedded.com> References: <201601091616.04193@pali> <87h9d49exz.fsf@linux.intel.com> <71cb45ec-a269-d510-df34-eb6eaa781da8@cogentembedded.com> <17243006.AtPKaaqTIG@saturn> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <17243006.AtPKaaqTIG@saturn> Sender: linux-usb-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: joerg Reisenweber Cc: Felipe Balbi , Tony Lindgren , =?UTF-8?Q?Pali_Roh=c3=a1r?= , Felipe Balbi , Greg Kroah-Hartman , linux-usb-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-omap-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Ivaylo Dimitrov , Sebastian Reichel , Aaro Koskinen , Pavel Machek , Nishanth Menon List-Id: linux-omap@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 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html