From: Peter Chen <hzpeterchen@gmail.com>
To: Roger Quadros <rogerq@ti.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: Mon, 16 May 2016 17:23:23 +0800 [thread overview]
Message-ID: <20160516092323.GD24609@shlinux2.ap.freescale.net> (raw)
In-Reply-To: <57398451.2060103@ti.com>
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.
> >
> >> return 0;
> >> @@ -660,9 +830,15 @@ static ssize_t usb_udc_softconn_store(struct device *dev,
> >> return -EOPNOTSUPP;
> >> }
> >>
> >> + /* In OTG mode we don't support softconnect, but b_bus_req */
> >> + if (udc->gadget->otg_dev) {
> >> + dev_err(dev, "soft-connect not supported in OTG mode\n");
> >> + return -EOPNOTSUPP;
> >> + }
> >> +
> >
> > The soft-connect can be supported at dual-role mode currently, we can
> > use b_bus_req entry once it is implemented later.
>
> Soft-connect should be done via sysfs handling within the OTG core.
> This can be added later. I don't want anything outside the OTG core
> to handle soft-connect behaviour as it will be hard to keep things
> in sync.
>
> I can update the comment to something like this.
>
> /* In OTG/dual-role mode, soft-connect should be handled by OTG core */
Ok, let's Felipe decide it.
>
> >
> >> if (sysfs_streq(buf, "connect")) {
> >> usb_gadget_udc_start(udc);
> >> - usb_gadget_connect(udc->gadget);
> >> + usb_udc_connect_control(udc);
> >
> > This line seems to be not related with this patch.
> >
> Right. I'll remove it.
>
> cheers,
> -roger
--
Best Regards,
Peter Chen
next prev parent reply other threads:[~2016-05-16 9:32 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 [this message]
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
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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