linux-kernel - RE: [PATCH 5/8] usb: cdns3: Changed type of gadget

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Date:   Thu, 1 Oct 2020 04:40:06 +0000
From:   Pawel Laszczak <pawell@...ence.com>
To:     Peter Chen <peter.chen@....com>
CC:     "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "balbi@...nel.org" <balbi@...nel.org>,
        "colin.king@...onical.com" <colin.king@...onical.com>,
        "rogerq@...com" <rogerq@...com>,
        Jayshri Dajiram Pawar <jpawar@...ence.com>,
        Rahul Kumar <kurahul@...ence.com>,
        Sanket Parmar <sparmar@...ence.com>,
        "nsekhar@...com" <nsekhar@...com>,
        "heikki.krogerus@...ux.intel.com" <heikki.krogerus@...ux.intel.com>,
        "chunfeng.yun@...iatek.com" <chunfeng.yun@...iatek.com>,
        "yanaijie@...wei.com" <yanaijie@...wei.com>
Subject: RE: [PATCH 5/8] usb: cdns3: Changed type of gadget_dev in cdns
 structure

>
>On 20-09-28 14:27:38, Pawel Laszczak wrote:
>> Patch changes the type for gadget_dev pointer in cdns structure from
>> pointer to cdns3_device structure to void pointer.
>> This filed is in reusable code and after this change it will be used to
>> point to both cdns3_device or cdnsp_device objects.
>>
>> Signed-off-by: Pawel Laszczak <pawell@...ence.com>
>> ---
>>  drivers/usb/cdns3/core.h   | 4 ++--
>>  drivers/usb/cdns3/gadget.c | 6 ++++++
>>  2 files changed, 8 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/usb/cdns3/core.h b/drivers/usb/cdns3/core.h
>> index 0c6e14683b36..267923904a37 100644
>> --- a/drivers/usb/cdns3/core.h
>> +++ b/drivers/usb/cdns3/core.h
>> @@ -55,7 +55,7 @@ struct cdns_role_driver {
>>   * @roles: array of supported roles for this controller
>>   * @role: current role
>>   * @host_dev: the child host device pointer for cdns core
>> - * @gadget_dev: the child gadget device pointer for cdns3 core
>> + * @gadget_dev: the child gadget device pointer
>>   * @usb2_phy: pointer to USB2 PHY
>>   * @usb3_phy: pointer to USB3 PHY
>>   * @mutex: the mutex for concurrent code at driver
>> @@ -87,7 +87,7 @@ struct cdns {
>>  	struct cdns_role_driver	*roles[USB_ROLE_DEVICE + 1];
>>  	enum usb_role			role;
>>  	struct platform_device		*host_dev;
>> -	struct cdns3_device		*gadget_dev;
>> +	void				*gadget_dev;
>>  	struct phy			*usb2_phy;
>>  	struct phy			*usb3_phy;
>>  	/* mutext used in workqueue*/
>> diff --git a/drivers/usb/cdns3/gadget.c b/drivers/usb/cdns3/gadget.c
>> index 26f68182e65e..f9cbc84bbfb8 100644
>> --- a/drivers/usb/cdns3/gadget.c
>> +++ b/drivers/usb/cdns3/gadget.c
>> @@ -3177,7 +3177,9 @@ static int __cdns3_gadget_init(struct cdns *cdns)
>>  static int cdns3_gadget_suspend(struct cdns *cdns, bool do_wakeup)
>>  {
>>  	struct cdns3_device *priv_dev = cdns->gadget_dev;
>> +	unsigned long flags;
>>
>> +	spin_lock_irqsave(&priv_dev->lock, flags);
>
>unrelated changes?

It's needed but this patch has missing removing this line from:
cdns3_suspend/cdns3_resume from core.c file. 
It exists in patch 2 (usb: cdns3: Split core.c into cdns3-plat and core.c file).
I will correct this patch. 

I had to move this spin_lock because in core.c we don't know the 
cdns->gadget_dev type (void * gadget_dev).

Thanks,
Pawel Laszczak

>
>>  	cdns3_disconnect_gadget(priv_dev);
>>
>>  	priv_dev->gadget.speed = USB_SPEED_UNKNOWN;
>> @@ -3186,6 +3188,7 @@ static int cdns3_gadget_suspend(struct cdns *cdns, bool do_wakeup)
>>
>>  	/* disable interrupt for device */
>>  	writel(0, &priv_dev->regs->usb_ien);
>> +	spin_unlock_irqrestore(&priv_dev->lock, flags);
>>
>>  	return 0;
>>  }
>> @@ -3193,11 +3196,14 @@ static int cdns3_gadget_suspend(struct cdns *cdns, bool do_wakeup)
>>  static int cdns3_gadget_resume(struct cdns *cdns, bool hibernated)
>>  {
>>  	struct cdns3_device *priv_dev = cdns->gadget_dev;
>> +	unsigned long flags;
>>
>>  	if (!priv_dev->gadget_driver)
>>  		return 0;
>>
>> +	spin_lock_irqsave(&priv_dev->lock, flags);
>
>ditto
>
>>  	cdns3_gadget_config(priv_dev);
>> +	spin_unlock_irqrestore(&priv_dev->lock, flags);
>>
>>  	return 0;
>>  }
>> --
>> 2.17.1
>>
>
>--
>
>Thanks,
>Peter Chen