On 17/05/16 10:38, Jun Li wrote: > 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 This is still a limitation. It is perfectly fine to have hcd=m, gadget=y or hcd=y, gadget=m cheers, -roger > > 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
