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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 v9 08/14] usb: otg: add OTG/dual-role core
Date: Wed, 8 Jun 2016 13:12:10 +0300	[thread overview]
Message-ID: <5757EF7A.20604@ti.com> (raw)
In-Reply-To: <20160608095336.GA4444@shlinux2>

Hi,

On 08/06/16 12:53, Peter Chen wrote:
> On Wed, Jun 08, 2016 at 12:03:40PM +0300, Roger Quadros wrote:
>> +int usb_otg_unregister(struct device *dev)
>> +{
>> +	struct usb_otg *otg;
>> +
>> +	mutex_lock(&otg_list_mutex);
>> +	otg = usb_otg_get_data(dev);
>> +	if (!otg) {
>> +		dev_err(dev, "otg: %s: device not in otg list\n",
>> +			__func__);
>> +		mutex_unlock(&otg_list_mutex);
>> +		return -EINVAL;
>> +	}
>> +
>> +	/* prevent unregister till both host & gadget have unregistered */
>> +	if (otg->host || otg->gadget) {
>> +		dev_err(dev, "otg: %s: host/gadget still registered\n",
>> +			__func__);
> 
> You need to call mutex_unlock here

Indeed. good catch.
> 
>> +
>> +int usb_otg_gadget_ready(struct usb_gadget *gadget, bool ready)
>> +{
> 
> What this API is for? Why need it in this version?

we moved gadget to otg registration from udc_bind_to_driver() to usb_add_gadget_udc_release().
This means there is a window when gadget function driver (e.g. g_zero) is not loaded.
We don't want to start the gadget controller in that window.

usb_otg_gadget_ready() is used by gadget core to notify the otg core when the function driver
is ready or not-ready.

> 
>> +	struct usb_otg *otg;
>> +	struct device *gadget_dev = &gadget->dev;
>> +	struct device *otg_dev = gadget->otg_dev;
>> +
>> +	if (!otg_dev)
>> +		return -EINVAL;
>> +
>> +	mutex_lock(&otg_list_mutex);
>> +	otg = usb_otg_get_data(otg_dev);
>> +	mutex_unlock(&otg_list_mutex);
>> +	if (!otg) {
>> +		dev_err(gadget_dev,
>> +			"otg: gadget %s wasn't registered with otg\n",
>> +			dev_name(&gadget->dev));
>> +		return -EINVAL;
>> +	}
>> +
>> +	mutex_lock(&otg->fsm.lock);
>> +	if (otg->gadget != gadget) {
>> +		mutex_unlock(&otg->fsm.lock);
>> +		dev_err(otg_dev, "otg: gadget %s wasn't registered with otg\n",
>> +			dev_name(&gadget->dev));
>> +		return -EINVAL;
>> +	}
>> +
>> +	/* Start/stop FSM & gadget */
>> +	otg->gadget_ready = ready;
>> +	if (ready)
>> +		usb_otg_start_fsm(otg);
>> +	else
>> +		usb_otg_stop_fsm(otg);
>> +
>> +	dev_dbg(otg_dev, "otg: gadget %s %sready\n", dev_name(&gadget->dev),
>> +		ready ? "" : "not ");
>> +
>> +	mutex_unlock(&otg->fsm.lock);
>> +
>> +	return 0;
>> +}
>> +EXPORT_SYMBOL_GPL(usb_otg_gadget_ready);
>> +
>> --- a/include/linux/usb/otg.h
>> +++ b/include/linux/usb/otg.h
>> @@ -10,10 +10,70 @@
>>  #define __LINUX_USB_OTG_H
>>  
>>  #include <linux/phy/phy.h>
>> -#include <linux/usb/phy.h>
>> -#include <linux/usb/otg-fsm.h>
>> +#include <linux/device.h>
>> +#include <linux/hrtimer.h>
>> +#include <linux/ktime.h>
> 
> The above two timer header files are not needed.

You had pointed this out earlier, but I missed it. Sorry.

--
cheers,
-roger

  reply	other threads:[~2016-06-08 10:12 UTC|newest]

Thread overview: 50+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-06-08  9:03 [PATCH v9 00/14] USB OTG/dual-role framework Roger Quadros
2016-06-08  9:03 ` [PATCH v9 01/14] usb: hcd: Initialize hcd->flags to 0 Roger Quadros
2016-06-08  9:03 ` [PATCH v9 02/14] usb: otg-fsm: Prevent build warning "VDBG" redefined Roger Quadros
2016-06-08  9:03 ` [PATCH v9 03/14] usb: hcd.h: Add OTG to HCD interface Roger Quadros
2016-06-08 11:39   ` Sergei Shtylyov
2016-06-08 12:04     ` Roger Quadros
2016-06-08 12:10       ` Sergei Shtylyov
2016-06-09  7:31         ` Roger Quadros
2016-06-09 10:16           ` Sergei Shtylyov
2016-06-09 14:11             ` Alan Stern
2016-06-10  7:01               ` Roger Quadros
2016-06-09  7:51   ` [PATCH v10 " Roger Quadros
2016-06-08  9:03 ` [PATCH v9 04/14] usb: otg-fsm: use usb_otg wherever possible Roger Quadros
2016-06-08  9:03 ` [PATCH v9 05/14] usb: otg-fsm: move host controller operations into usb_otg->hcd_ops Roger Quadros
2016-06-08  9:03 ` [PATCH v9 06/14] usb: gadget.h: Add OTG to gadget interface Roger Quadros
2016-06-08  9:03 ` [PATCH v9 07/14] usb: otg: get rid of CONFIG_USB_OTG_FSM in favour of CONFIG_USB_OTG Roger Quadros
2016-06-08  9:03 ` [PATCH v9 08/14] usb: otg: add OTG/dual-role core Roger Quadros
2016-06-08  9:53   ` Peter Chen
2016-06-08 10:12     ` Roger Quadros [this message]
2016-06-08 12:42       ` Peter Chen
2016-06-09  7:24         ` Roger Quadros
2016-06-12  6:26           ` Peter Chen
2016-06-12 10:56             ` Peter Chen
2016-06-09  7:53   ` [PATCH v10 " Roger Quadros
2016-06-09 12:34     ` Sergei Shtylyov
2016-06-10  7:04       ` Roger Quadros
2016-06-10 10:19       ` Roger Quadros
2016-06-10 10:44         ` Sergei Shtylyov
2016-06-10 10:54           ` Roger Quadros
2016-06-10 11:02             ` Felipe Balbi
2016-06-08  9:03 ` [PATCH v9 09/14] usb: of: add an API to get OTG device from USB controller node Roger Quadros
2016-06-08  9:03 ` [PATCH v9 10/14] usb: otg: add hcd companion support Roger Quadros
2016-06-08  9:03 ` [PATCH v9 11/14] usb: otg: use dev_dbg() instead of VDBG() Roger Quadros
2016-06-08 15:10   ` Joe Perches
2016-06-09  7:25     ` Roger Quadros
2016-06-09  7:55   ` [PATCH v10 " Roger Quadros
2016-06-09 15:43     ` Joe Perches
2016-06-10  7:05       ` Roger Quadros
2016-06-08  9:03 ` [PATCH v9 12/14] usb: hcd: Adapt to OTG core Roger Quadros
2016-06-08 11:42   ` Sergei Shtylyov
2016-06-08 12:06     ` Roger Quadros
2016-06-08 12:11       ` Sergei Shtylyov
2016-06-09  7:27         ` Roger Quadros
2016-06-08  9:03 ` [PATCH v9 13/14] usb: gadget: udc: adapt " Roger Quadros
2016-06-09 10:49   ` Yoshihiro Shimoda
2016-06-10  7:06     ` Roger Quadros
2016-06-08  9:03 ` [PATCH v9 14/14] usb: host: xhci-plat: Add otg device to platform data Roger Quadros
2016-06-09  5:27 ` [PATCH v9 00/14] USB OTG/dual-role framework Peter Chen
2016-06-09  7:30   ` Roger Quadros
2016-06-09 10:13     ` Yoshihiro Shimoda

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