2020-11-20 00:18:48

by Wesley Cheng

Subject: [PATCH] usb: dwc3: gadget: Restart DWC3 gadget when enabling pullup

usb_gadget_deactivate/usb_gadget_activate does not execute the UDC start
operation, which may leave EP0 disabled and event IRQs disabled when
re-activating the function. Move the enabling/disabling of USB EP0 and
device event IRQs to be performed in the pullup routine.

Fixes: ae7e86108b12 ("usb: dwc3: Stop active transfers before halting the
controller")

Reported-by: Michael Tretter <[email protected]>
Signed-off-by: Wesley Cheng <[email protected]>
---
drivers/usb/dwc3/gadget.c | 14 +++-----------
1 file changed, 3 insertions(+), 11 deletions(-)

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 5d879b7606d5..922c8b76e534 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -1988,6 +1988,7 @@ static int dwc3_gadget_run_stop(struct dwc3 *dwc, int is_on, int suspend)

static void dwc3_gadget_disable_irq(struct dwc3 *dwc);
static void __dwc3_gadget_stop(struct dwc3 *dwc);
+static int __dwc3_gadget_start(struct dwc3 *dwc);

static int dwc3_gadget_pullup(struct usb_gadget *g, int is_on)
{
@@ -2050,6 +2051,8 @@ static int dwc3_gadget_pullup(struct usb_gadget *g, int is_on)
dwc->ev_buf->lpos = (dwc->ev_buf->lpos + count) %
dwc->ev_buf->length;
}
+ } else {
+ __dwc3_gadget_start(dwc);
}

ret = dwc3_gadget_run_stop(dwc, is_on, false);
@@ -2224,10 +2227,6 @@ static int dwc3_gadget_start(struct usb_gadget *g,
}

dwc->gadget_driver = driver;
-
- if (pm_runtime_active(dwc->dev))
- __dwc3_gadget_start(dwc);
-
spin_unlock_irqrestore(&dwc->lock, flags);

return 0;
@@ -2253,13 +2252,6 @@ static int dwc3_gadget_stop(struct usb_gadget *g)
unsigned long flags;

spin_lock_irqsave(&dwc->lock, flags);
-
- if (pm_runtime_suspended(dwc->dev))
- goto out;
-
- __dwc3_gadget_stop(dwc);
-
-out:
dwc->gadget_driver = NULL;
spin_unlock_irqrestore(&dwc->lock, flags);

--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

2020-11-20 15:10:43

by Michael Tretter

Subject: Re: [PATCH] usb: dwc3: gadget: Restart DWC3 gadget when enabling pullup

On Thu, 19 Nov 2020 16:13:21 -0800, Wesley Cheng wrote:
> usb_gadget_deactivate/usb_gadget_activate does not execute the UDC start
> operation, which may leave EP0 disabled and event IRQs disabled when
> re-activating the function. Move the enabling/disabling of USB EP0 and
> device event IRQs to be performed in the pullup routine.
>
> Fixes: ae7e86108b12 ("usb: dwc3: Stop active transfers before halting the
> controller")
>
> Reported-by: Michael Tretter <[email protected]>
> Signed-off-by: Wesley Cheng <[email protected]>

Tested-by: Michael Tretter <[email protected]>

> ---
> drivers/usb/dwc3/gadget.c | 14 +++-----------
> 1 file changed, 3 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
> index 5d879b7606d5..922c8b76e534 100644
> --- a/drivers/usb/dwc3/gadget.c
> +++ b/drivers/usb/dwc3/gadget.c
> @@ -1988,6 +1988,7 @@ static int dwc3_gadget_run_stop(struct dwc3 *dwc, int is_on, int suspend)
>
> static void dwc3_gadget_disable_irq(struct dwc3 *dwc);
> static void __dwc3_gadget_stop(struct dwc3 *dwc);
> +static int __dwc3_gadget_start(struct dwc3 *dwc);
>
> static int dwc3_gadget_pullup(struct usb_gadget *g, int is_on)
> {
> @@ -2050,6 +2051,8 @@ static int dwc3_gadget_pullup(struct usb_gadget *g, int is_on)
> dwc->ev_buf->lpos = (dwc->ev_buf->lpos + count) %
> dwc->ev_buf->length;
> }
> + } else {
> + __dwc3_gadget_start(dwc);
> }
>
> ret = dwc3_gadget_run_stop(dwc, is_on, false);
> @@ -2224,10 +2227,6 @@ static int dwc3_gadget_start(struct usb_gadget *g,
> }
>
> dwc->gadget_driver = driver;
> -
> - if (pm_runtime_active(dwc->dev))
> - __dwc3_gadget_start(dwc);
> -
> spin_unlock_irqrestore(&dwc->lock, flags);
>
> return 0;
> @@ -2253,13 +2252,6 @@ static int dwc3_gadget_stop(struct usb_gadget *g)
> unsigned long flags;
>
> spin_lock_irqsave(&dwc->lock, flags);
> -
> - if (pm_runtime_suspended(dwc->dev))
> - goto out;
> -
> - __dwc3_gadget_stop(dwc);
> -
> -out:
> dwc->gadget_driver = NULL;
> spin_unlock_irqrestore(&dwc->lock, flags);
>
> --
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>
>

2020-11-30 11:51:11

by Michael Tretter

Subject: Re: [PATCH] usb: dwc3: gadget: Restart DWC3 gadget when enabling pullup

On Fri, 20 Nov 2020 16:08:04 +0100, Michael Tretter wrote:
> On Thu, 19 Nov 2020 16:13:21 -0800, Wesley Cheng wrote:
> > usb_gadget_deactivate/usb_gadget_activate does not execute the UDC start
> > operation, which may leave EP0 disabled and event IRQs disabled when
> > re-activating the function. Move the enabling/disabling of USB EP0 and
> > device event IRQs to be performed in the pullup routine.
> >
> > Fixes: ae7e86108b12 ("usb: dwc3: Stop active transfers before halting the
> > controller")
> >
> > Reported-by: Michael Tretter <[email protected]>
> > Signed-off-by: Wesley Cheng <[email protected]>
>
> Tested-by: Michael Tretter <[email protected]>

Gentle ping. I didn't see this fix being picked up into any of the usb trees.

Michael

>
> > ---
> > drivers/usb/dwc3/gadget.c | 14 +++-----------
> > 1 file changed, 3 insertions(+), 11 deletions(-)
> >
> > diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
> > index 5d879b7606d5..922c8b76e534 100644
> > --- a/drivers/usb/dwc3/gadget.c
> > +++ b/drivers/usb/dwc3/gadget.c
> > @@ -1988,6 +1988,7 @@ static int dwc3_gadget_run_stop(struct dwc3 *dwc, int is_on, int suspend)
> >
> > static void dwc3_gadget_disable_irq(struct dwc3 *dwc);
> > static void __dwc3_gadget_stop(struct dwc3 *dwc);
> > +static int __dwc3_gadget_start(struct dwc3 *dwc);
> >
> > static int dwc3_gadget_pullup(struct usb_gadget *g, int is_on)
> > {
> > @@ -2050,6 +2051,8 @@ static int dwc3_gadget_pullup(struct usb_gadget *g, int is_on)
> > dwc->ev_buf->lpos = (dwc->ev_buf->lpos + count) %
> > dwc->ev_buf->length;
> > }
> > + } else {
> > + __dwc3_gadget_start(dwc);
> > }
> >
> > ret = dwc3_gadget_run_stop(dwc, is_on, false);
> > @@ -2224,10 +2227,6 @@ static int dwc3_gadget_start(struct usb_gadget *g,
> > }
> >
> > dwc->gadget_driver = driver;
> > -
> > - if (pm_runtime_active(dwc->dev))
> > - __dwc3_gadget_start(dwc);
> > -
> > spin_unlock_irqrestore(&dwc->lock, flags);
> >
> > return 0;
> > @@ -2253,13 +2252,6 @@ static int dwc3_gadget_stop(struct usb_gadget *g)
> > unsigned long flags;
> >
> > spin_lock_irqsave(&dwc->lock, flags);
> > -
> > - if (pm_runtime_suspended(dwc->dev))
> > - goto out;
> > -
> > - __dwc3_gadget_stop(dwc);
> > -
> > -out:
> > dwc->gadget_driver = NULL;
> > spin_unlock_irqrestore(&dwc->lock, flags);
> >
> > --
> > The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> > a Linux Foundation Collaborative Project
> >
> >
>