From: Roger Quadros <rogerq@ti.com>
To: Peter Chen <hzpeterchen@gmail.com>
Cc: <peter.chen@freescale.com>, <balbi@kernel.org>,
<tony@atomide.com>, <gregkh@linuxfoundation.org>,
<dan.j.williams@intel.com>, <mathias.nyman@linux.intel.com>,
<Joao.Pinto@synopsys.com>, <sergei.shtylyov@cogentembedded.com>,
<jun.li@freescale.com>, <grygorii.strashko@ti.com>,
<yoshihiro.shimoda.uh@renesas.com>, <robh@kernel.org>,
<nsekhar@ti.com>, <b-liu@ti.com>, <linux-usb@vger.kernel.org>,
<linux-omap@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
<devicetree@vger.kernel.org>
Subject: Re: [PATCH v8 13/14] usb: gadget: udc: adapt to OTG core
Date: Wed, 18 May 2016 15:45:11 +0300 [thread overview]
Message-ID: <573C63D7.9050200@ti.com> (raw)
In-Reply-To: <20160518031829.GA4244@shlinux2.ap.freescale.net>
On 18/05/16 06:18, Peter Chen wrote:
> On Mon, May 16, 2016 at 12:51:53PM +0300, Roger Quadros wrote:
>> On 16/05/16 12:23, Peter Chen wrote:
>>> On Mon, May 16, 2016 at 11:26:57AM +0300, Roger Quadros wrote:
>>>> Hi,
>>>>
>>>> On 16/05/16 10:02, Peter Chen wrote:
>>>>> On Fri, May 13, 2016 at 01:03:27PM +0300, Roger Quadros wrote:
>>>>>> +
>>>>>> +static int usb_gadget_connect_control(struct usb_gadget *gadget, bool connect)
>>>>>> +{
>>>>>> + struct usb_udc *udc;
>>>>>> +
>>>>>> + mutex_lock(&udc_lock);
>>>>>> + udc = usb_gadget_to_udc(gadget);
>>>>>> + if (!udc) {
>>>>>> + dev_err(gadget->dev.parent, "%s: gadget not registered.\n",
>>>>>> + __func__);
>>>>>> + mutex_unlock(&udc_lock);
>>>>>> + return -EINVAL;
>>>>>> + }
>>>>>> +
>>>>>> + if (connect) {
>>>>>> + if (!gadget->connected)
>>>>>> + usb_gadget_connect(udc->gadget);
>>>>>> + } else {
>>>>>> + if (gadget->connected) {
>>>>>> + usb_gadget_disconnect(udc->gadget);
>>>>>> + udc->driver->disconnect(udc->gadget);
>>>>>> + }
>>>>>> + }
>>>>>> +
>>>>>> + mutex_unlock(&udc_lock);
>>>>>> +
>>>>>> + return 0;
>>>>>> +}
>>>>>> +
>>>>>
>>>>> Since this is called for vbus interrupt, why not using
>>>>> usb_udc_vbus_handler directly, and call udc->driver->disconnect
>>>>> at usb_gadget_stop.
>>>>
>>>> We can't assume that this is always called for vbus interrupt so
>>>> I decided not to call usb_udc_vbus_handler.
>>>>
>>>> udc->vbus is really pointless for us. We keep vbus states in our
>>>> state machine and leave udc->vbus as ture always.
>>>>
>>>> Why do you want to move udc->driver->disconnect() to stop?
>>>> If USB controller disconnected from bus then the gadget driver
>>>> must be notified about the disconnect immediately. The controller
>>>> may or may not be stopped by the core.
>>>>
>>>
>>> Then, would you give some comments when this API will be used?
>>> I was assumed it is only used for drd state machine.
>>
>> drd_state machine didn't even need this API in the first place :).
>> You guys wanted me to separate out start/stop and connect/disconnect for full OTG case.
>> Won't full OTG state machine want to use this API? If not what would it use?
>>
>
> Oh, I meant only drd and fully otg state machine needs it. I am
> wondering if we need have a new API to do it. Two questions:
OK.
>
> - Except for vbus interrupt, any chances this API will be used at
> current logic?
I don't think so. But we can't assume caller behaviour for any API.
> - When this API is called but without a coming gadget->stop?
>
Never for DRD case. But we want to catch wrong users.
cheers,
-roger
next prev parent reply other threads:[~2016-05-18 12:45 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-13 10:03 [PATCH v8 00/14] USB OTG/dual-role framework Roger Quadros
2016-05-13 10:03 ` [PATCH v8 01/14] usb: hcd: Initialize hcd->flags to 0 Roger Quadros
2016-05-13 10:03 ` [PATCH v8 02/14] usb: otg-fsm: Prevent build warning "VDBG" redefined Roger Quadros
2016-05-13 10:03 ` [PATCH v8 03/14] usb: hcd.h: Add OTG to HCD interface Roger Quadros
2016-05-13 10:03 ` [PATCH v8 04/14] usb: otg-fsm: use usb_otg wherever possible Roger Quadros
2016-05-13 10:03 ` [PATCH v8 05/14] usb: otg-fsm: move host controller operations into usb_otg->hcd_ops Roger Quadros
2016-05-13 10:03 ` [PATCH v8 06/14] usb: gadget.h: Add OTG to gadget interface Roger Quadros
2016-05-13 10:03 ` [PATCH v8 07/14] usb: otg: get rid of CONFIG_USB_OTG_FSM in favour of CONFIG_USB_OTG Roger Quadros
2016-05-13 10:03 ` [PATCH v8 08/14] usb: otg: add OTG/dual-role core Roger Quadros
2016-05-16 9:00 ` Roger Quadros
[not found] ` <CAL411-qb0dHQrn+AarSApCq6L=toKPRerLKDcx_H+5WDWu_VDg@mail.gmail.com>
2016-05-18 12:59 ` Roger Quadros
2016-05-20 8:31 ` Roger Quadros
2016-05-20 9:19 ` Roger Quadros
2016-05-20 9:53 ` Peter Chen
2016-05-23 10:06 ` Roger Quadros
2016-05-24 9:45 ` Roger Quadros
2016-05-25 2:44 ` Peter Chen
2016-05-25 3:19 ` Jun Li
2016-05-25 12:26 ` Roger Quadros
2016-05-25 12:21 ` Roger Quadros
2016-05-25 14:44 ` Jun Li
2016-05-13 10:03 ` [PATCH v8 09/14] usb: of: add an API to get OTG device from USB controller node Roger Quadros
2016-05-20 9:29 ` [PATCH v9 " Roger Quadros
2016-05-23 21:06 ` Rob Herring
2016-05-13 10:03 ` [PATCH v8 10/14] usb: otg: add hcd companion support Roger Quadros
2016-05-13 18:13 ` Rob Herring
2016-05-16 8:12 ` Roger Quadros
2016-05-20 9:32 ` [PATCH v9 " Roger Quadros
2016-05-23 21:07 ` Rob Herring
2016-05-13 10:03 ` [PATCH v8 11/14] usb: otg: use dev_dbg() instead of VDBG() Roger Quadros
2016-05-13 10:03 ` [PATCH v8 12/14] usb: hcd: Adapt to OTG core Roger Quadros
2016-05-13 10:03 ` [PATCH v8 13/14] usb: gadget: udc: adapt " Roger Quadros
2016-05-16 7:02 ` Peter Chen
2016-05-16 8:26 ` Roger Quadros
2016-05-16 9:23 ` Peter Chen
2016-05-16 9:51 ` Roger Quadros
2016-05-17 7:38 ` Jun Li
2016-05-17 8:08 ` Roger Quadros
2016-05-17 8:28 ` Jun Li
2016-05-18 12:42 ` Roger Quadros
2016-05-18 13:12 ` Jun Li
2016-05-18 13:43 ` Roger Quadros
2016-05-18 14:46 ` Jun Li
2016-05-19 7:32 ` Roger Quadros
2016-05-21 2:29 ` Peter Chen
2016-05-23 3:21 ` Peter Chen
2016-05-23 10:11 ` Roger Quadros
2016-05-23 10:34 ` Jun Li
2016-05-23 10:36 ` Roger Quadros
2016-05-24 2:53 ` Peter Chen
2016-06-08 7:32 ` Roger Quadros
2016-06-08 9:05 ` Peter Chen
2016-05-18 3:18 ` Peter Chen
2016-05-18 12:45 ` Roger Quadros [this message]
2016-05-20 1:39 ` Peter Chen
2016-05-20 7:26 ` Roger Quadros
2016-05-21 2:44 ` Peter Chen
2016-06-01 7:38 ` Peter Chen
2016-06-02 11:07 ` Roger Quadros
2016-05-13 10:03 ` [PATCH v8 14/14] usb: host: xhci-plat: Add otg device to platform data Roger Quadros
2016-05-30 9:29 ` [PATCH v8 00/14] USB OTG/dual-role framework Peter Chen
2016-05-30 14:04 ` Roger Quadros
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