linux-kernel - Re: [PATCH v10 13/14] usb: gadget: udc: adapt to OTG core

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Message-ID: <20160612113655.GC32615@shlinux2>
Date:	Sun, 12 Jun 2016 19:36:56 +0800
From:	Peter Chen <hzpeterchen@...il.com>
To:	Roger Quadros <rogerq@...com>
Cc:	peter.chen@...escale.com, balbi@...nel.org, tony@...mide.com,
	gregkh@...uxfoundation.org, dan.j.williams@...el.com,
	mathias.nyman@...ux.intel.com, Joao.Pinto@...opsys.com,
	sergei.shtylyov@...entembedded.com, jun.li@...escale.com,
	grygorii.strashko@...com, yoshihiro.shimoda.uh@...esas.com,
	robh@...nel.org, nsekhar@...com, b-liu@...com, joe@...ches.com,
	linux-usb@...r.kernel.org, linux-omap@...r.kernel.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v10 13/14] usb: gadget: udc: adapt to OTG core

On Fri, Jun 10, 2016 at 04:07:22PM +0300, Roger Quadros wrote:
>  
> +/**
> + * usb_otg_add_gadget_udc - adds a new gadget to the udc class driver list
> + * @parent: the parent device to this udc. Usually the controller
> + * driver's device.

It seems it should be udc device

> +/* udc_lock must be held */
>  static int udc_bind_to_driver(struct usb_udc *udc, struct usb_gadget_driver *driver)
>  {
>  	int ret;
> @@ -1282,17 +1449,26 @@ static int udc_bind_to_driver(struct usb_udc *udc, struct usb_gadget_driver *dri
>  	ret = driver->bind(udc->gadget, driver);
>  	if (ret)
>  		goto err1;
> -	ret = usb_gadget_udc_start(udc);
> -	if (ret) {
> -		driver->unbind(udc->gadget);
> -		goto err1;
> +
> +	/* If OTG/dual-role, the otg core manages UDC start/stop */
> +	if (udc->gadget->otg_dev) {
> +		mutex_unlock(&udc_lock);
> +		usb_otg_gadget_ready(udc->gadget, true);
> +		mutex_lock(&udc_lock);
> +	} else {
> +		ret = usb_gadget_udc_start(udc);
> +		if (ret) {
> +			mutex_unlock(&udc_lock);
> +			driver->unbind(udc->gadget);
> +			goto err1;
> +		}
> +		usb_udc_connect_control(udc);
>  	}
> -	usb_udc_connect_control(udc);
>  
>  	kobject_uevent(&udc->dev.kobj, KOBJ_CHANGE);
>  	return 0;
>  err1:
> -	if (ret != -EISNAM)
> +	if ((ret != -EISNAM) && (ret != -EPROBE_DEFER))

It seems it will not introduce -EPROBE_DEFER with your changes
in udc_bind_to_driver

-- 

Best Regards,
Peter Chen