linux-kernel - Re: [PATCH 14/16] usb: musb: dsps: add MUSB_DEVCTL

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Message-ID: <CADYTM3b7-WHA73qMypUSd8VcTWuvooap_Ki65BcoJ7qKhejXZw@mail.gmail.com>
Date:	Fri, 26 Jul 2013 13:17:00 -0500
From:	Bin Liu <binmlist@...il.com>
To:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	balbi@...com, george.cherian@...com
Subject: Re: [PATCH 14/16] usb: musb: dsps: add MUSB_DEVCTL_SESSION back after removal

On Fri, Jul 26, 2013 at 12:53 PM, Bin Liu <binmlist@...il.com> wrote:
> Sebastian,
>
> On Fri, Jul 26, 2013 at 11:31 AM, Sebastian Andrzej Siewior
> <bigeasy@...utronix.de> wrote:
>> * Bin Liu | 2013-07-23 13:55:27 [-0500]:
>>
>>>Hi Sebastian,
>> Hi Bin,
>>
>>>either by SRP or HNP, or something else. In TI 3.2 kernel, there is
>>>workaround in otg_timer() to _toggle_ the SESSION bit to detect if ID
>>>pin is grounded, which means a USB device is connected.
>>
>> I've been looking at
>>   http://downloads.ti.com/sitara_linux/esd/AM335xSDK/latest/index_FDS.html
>>
>> and I can't find what you are talking about. My MUSB_DEVCTL doesn't
>> change after I connect a device and the SESSION bit is not set. Also I
>> remain in a_idle state. Do you have maybe a hint for me? :)
>
> In TI 3.2 kernel, the otg_timer() toggles the SESSION bit in
> OTG_STATE_B_IDLE state. So whenever the ID pin is grounded by
> connecting a device, the controller will try go into host mode.
> But I have no idea why your board is in a_idle not b_idle. The toggle
> does not handle a_idle.
>
> Do you use the AM335x GP EVM, not the smaller StarterKit EVM, right?
> the USB0 port on SK EVM is device only.
>
> But anyway, I have not seen any use case which uses micro-AB
> receptacle and requires such dynamic role switching. So I kind of

I meant the real customer use cases, not the EVMs ;)
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