linux-kernel - Re: [PATCH v4 9/9] usb: dwc3: core: don't break during suspend/resume while we're dual-role

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Date:	Thu, 3 Sep 2015 17:02:21 +0300
From:	Roger Quadros <rogerq@...com>
To:	<balbi@...com>
CC:	<tony@...mide.com>, <Joao.Pinto@...opsys.com>,
	<sergei.shtylyov@...entembedded.com>, <peter.chen@...escale.com>,
	<jun.li@...escale.com>, <linux-usb@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>
Subject: Re: [PATCH v4 9/9] usb: dwc3: core: don't break during suspend/resume
 while we're dual-role

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On 02/09/15 17:48, Felipe Balbi wrote:
> On Wed, Sep 02, 2015 at 05:24:24PM +0300, Roger Quadros wrote:
>> We can't rely just on dr_mode to decide if we're in host or gadget
>> mode when we're configured as otg/dual-role. So while dr_mode is
>> OTG, we find out from  the otg state machine if we're in host
>> or gadget mode and take the necessary actions during suspend/resume.
>>
>> Also make sure that we disable OTG irq and events during system suspend
>> so that we don't lockup the system during system suspend/resume.
>>
>> Signed-off-by: Roger Quadros <rogerq@...com>
>> ---
>>  drivers/usb/dwc3/core.c | 27 +++++++++------------------
>>  1 file changed, 9 insertions(+), 18 deletions(-)
>>
>> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
>> index 654aebf..25891e3 100644
>> --- a/drivers/usb/dwc3/core.c
>> +++ b/drivers/usb/dwc3/core.c
>> @@ -1455,18 +1455,15 @@ static int dwc3_suspend(struct device *dev)
>>  		dwc->octl = dwc3_readl(dwc->regs, DWC3_OCTL);
>>  		dwc->oevt = dwc3_readl(dwc->regs, DWC3_OEVT);
>>  		dwc->oevten = dwc3_readl(dwc->regs, DWC3_OEVTEN);
>> +		dwc3_writel(dwc->regs, DWC3_OEVTEN, 0);
>> +		disable_irq(dwc->otg_irq);
> 
> you don't need disable_irq() here. In fact, it causes problems since
> you're calling it with IRQs disabled.

OK. will remove it.

> 
>>  	}
>>  
>> -	switch (dwc->dr_mode) {
>> -	case USB_DR_MODE_PERIPHERAL:
>> -	case USB_DR_MODE_OTG:
>> +	if (dwc->dr_mode == USB_DR_MODE_PERIPHERAL ||
>> +	    ((dwc->dr_mode == USB_DR_MODE_OTG) && (dwc->fsm->protocol == PROTO_GADGET)))
>>  		dwc3_gadget_suspend(dwc);
>> -		/* FALLTHROUGH */
>> -	case USB_DR_MODE_HOST:
>> -	default:
>> -		dwc3_event_buffers_cleanup(dwc);
>> -		break;
>> -	}
>> +
>> +	dwc3_event_buffers_cleanup(dwc);
>>  
>>  	dwc->gctl = dwc3_readl(dwc->regs, DWC3_GCTL);
>>  	spin_unlock_irqrestore(&dwc->lock, flags);
>> @@ -1506,18 +1503,12 @@ static int dwc3_resume(struct device *dev)
>>  		dwc3_writel(dwc->regs, DWC3_OCTL, dwc->octl);
>>  		dwc3_writel(dwc->regs, DWC3_OEVT, dwc->oevt);
>>  		dwc3_writel(dwc->regs, DWC3_OEVTEN, dwc->oevten);
>> +		enable_irq(dwc->otg_irq);
>>  	}
>>  
>> -	switch (dwc->dr_mode) {
>> -	case USB_DR_MODE_PERIPHERAL:
>> -	case USB_DR_MODE_OTG:
>> +	if (dwc->dr_mode == USB_DR_MODE_PERIPHERAL ||
>> +	    ((dwc->dr_mode == USB_DR_MODE_OTG) && (dwc->fsm->protocol == PROTO_GADGET)))
>>  		dwc3_gadget_resume(dwc);
>> -		/* FALLTHROUGH */
>> -	case USB_DR_MODE_HOST:
>> -	default:
>> -		/* do nothing */
>> -		break;
>> -	}
>>  
>>  	spin_unlock_irqrestore(&dwc->lock, flags);
>>  
>> -- 
>> 2.1.4
>>
> 

- --
cheers,
- -roger
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