Hi > -----Original Message----- > From: Roger Quadros [mailto:rogerq@xxxxxx] > Sent: Monday, May 16, 2016 5:52 PM > To: Peter Chen <hzpeterchen@xxxxxxxxx> > Cc: peter.chen@xxxxxxxxxxxxx; balbi@xxxxxxxxxx; tony@xxxxxxxxxxx; > gregkh@xxxxxxxxxxxxxxxxxxx; dan.j.williams@xxxxxxxxx; > mathias.nyman@xxxxxxxxxxxxxxx; Joao.Pinto@xxxxxxxxxxxx; > sergei.shtylyov@xxxxxxxxxxxxxxxxxx; jun.li@xxxxxxxxxxxxx; > grygorii.strashko@xxxxxx; yoshihiro.shimoda.uh@xxxxxxxxxxx; > robh@xxxxxxxxxx; nsekhar@xxxxxx; b-liu@xxxxxx; linux-usb@xxxxxxxxxxxxxxx; > linux-omap@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; > devicetree@xxxxxxxxxxxxxxx > Subject: Re: [PATCH v8 13/14] usb: gadget: udc: adapt to OTG core > > 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? Instead create those new interfaces/symbol here and there just aim to address build problems in diff configures, Could we only allow meaningful combination of those 3 drivers configures? Hcd=y, gadget=y, otg=y or Hcd=m, gadget=m, otg=m Li Jun > > cheers, > -roger > > > > >>> > >>>> 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 > > -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
