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

Message ID 1441203864-15786-10-git-send-email-rogerq@ti.com
State New
Headers show

Commit Message

Roger Quadros Sept. 2, 2015, 2:24 p.m.
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@ti.com>
---
 drivers/usb/dwc3/core.c | 27 +++++++++------------------
 1 file changed, 9 insertions(+), 18 deletions(-)

Comments

Felipe Balbi Sept. 2, 2015, 2:48 p.m. | #1
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@ti.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.

>  	}
>  
> -	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
>
Sergei Shtylyov Sept. 2, 2015, 5:22 p.m. | #2
Hello.

On 09/02/2015 05:24 PM, 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@ti.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);
>   	}
>
> -	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)))

    Hm, you're not very consistent about your parens. :-)

[...]
> @@ -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)))

    Same here...

[...]

WBR, Sergei

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Roger Quadros Sept. 3, 2015, 2:01 p.m. | #3
On 02/09/15 20:22, Sergei Shtylyov wrote:
> Hello.
> 
> On 09/02/2015 05:24 PM, 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@ti.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);
>>       }
>>
>> -    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)))
> 
>    Hm, you're not very consistent about your parens. :-)

You're right. Should be

if ((dwc->dr_mode == USB_DR_MODE_PERIPHERAL) ||
    ((dwc->dr_mode == USB_DR_MODE_OTG) && (dwc->fsm->protocol == PROTO_GADGET)))


> 
> [...]
>> @@ -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)))
> 
>    Same here...

--
cheers,
-roger
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Roger Quadros Sept. 3, 2015, 2:02 p.m. | #4
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

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@ti.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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Sergei Shtylyov Sept. 3, 2015, 2:05 p.m. | #5
Hello.

On 09/03/2015 05:01 PM, 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@ti.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);
>>>        }
>>>
>>> -    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)))
>>
>>     Hm, you're not very consistent about your parens. :-)
>
> You're right. Should be
>
> if ((dwc->dr_mode == USB_DR_MODE_PERIPHERAL) ||
>      ((dwc->dr_mode == USB_DR_MODE_OTG) && (dwc->fsm->protocol == PROTO_GADGET)))

    Parens around == are useless, I'd prefer if you deleted them. But if you'd 
like to keep them, let it be so. :-)

> --
> cheers,
> -roger

MBR, Sergei

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Roger Quadros Sept. 3, 2015, 2:10 p.m. | #6
On 03/09/15 17:05, Sergei Shtylyov wrote:
> Hello.
> 
> On 09/03/2015 05:01 PM, 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@ti.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);
>>>>        }
>>>>
>>>> -    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)))
>>>
>>>     Hm, you're not very consistent about your parens. :-)
>>
>> You're right. Should be
>>
>> if ((dwc->dr_mode == USB_DR_MODE_PERIPHERAL) ||
>>      ((dwc->dr_mode == USB_DR_MODE_OTG) && (dwc->fsm->protocol == PROTO_GADGET)))
> 
>    Parens around == are useless, I'd prefer if you deleted them. But if you'd like to keep them, let it be so. :-)

OK, how about this then?

if (dwc->dr_mode == USB_DR_MODE_PERIPHERAL ||
    (dwc->dr_mode == USB_DR_MODE_OTG && dwc->fsm->protocol == PROTO_GADGET))

cheers,
-roger
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Sergei Shtylyov Sept. 3, 2015, 2:13 p.m. | #7
On 09/03/2015 05:10 PM, 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@ti.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);
>>>>>         }
>>>>>
>>>>> -    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)))
>>>>
>>>>      Hm, you're not very consistent about your parens. :-)
>>>
>>> You're right. Should be
>>>
>>> if ((dwc->dr_mode == USB_DR_MODE_PERIPHERAL) ||
>>>       ((dwc->dr_mode == USB_DR_MODE_OTG) && (dwc->fsm->protocol == PROTO_GADGET)))
>>
>>     Parens around == are useless, I'd prefer if you deleted them. But if you'd like to keep them, let it be so. :-)

> OK, how about this then?

> if (dwc->dr_mode == USB_DR_MODE_PERIPHERAL ||
>      (dwc->dr_mode == USB_DR_MODE_OTG && dwc->fsm->protocol == PROTO_GADGET))

    Strictly speaking, parens around && are also not needed but gcc may 
probably issue a warning without them. Not sure, your call.

> cheers,
> -roger

MBR, Sergei

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Patch

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);
 	}
 
-	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);