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

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Message-ID: <DM6PR07MB5529DD806756B5EB36A2B6B4DD0C0@DM6PR07MB5529.namprd07.prod.outlook.com>
Date:   Mon, 5 Oct 2020 06:15:33 +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).
>

You have right, after merging  the latest patches from Felipe 
repository this changes are not need.

Regards,
Pawel,

>
>>
>>>  	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