linux-kernel - Re: [PATCH] usb: dwc3: gadget: add missing wakeup link states

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Date:   Sat, 24 Apr 2021 20:41:33 +0200
From:   Marcel Hamer <marcel@...idxs.nl>
To:     Felipe Balbi <balbi@...nel.org>
Cc:     Marcel Hamer <marcel@...idxs.se>, linux-usb@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, Thinh Nguyen <thinhn@...opsys.com>
Subject: Re: [PATCH] usb: dwc3: gadget: add missing wakeup link states

On Sat, Apr 24, 2021 at 11:08:07AM +0300, Felipe Balbi wrote:
> Marcel Hamer <marcel@...idxs.se> writes:
> 
> > In dwc3_send_gadget_ep_cmd() a check is performed if the gadget needs
> > waking up. The following condition is checked before calling the
> > __dwc3_gadget_wakeup() function:
> >
> > 	needs_wakeup = (dwc->link_state == DWC3_LINK_STATE_U1 ||
> >         		dwc->link_state == DWC3_LINK_STATE_U2 ||
> >                         dwc->link_state == DWC3_LINK_STATE_U3);
> >
> > Inside __dwc3_gadget_wakeup() only link_state DWC3_LINK_STATE_U3 is checked
> > and link state DWC3_LINK_STATE_U1 and DWC3_LINK_STATE_U2 are considered
> > invalid and generate a warning because of the call to:
> >
> > 	dev_WARN_ONCE(dwc->dev, ret, "wakeup failed --> %d\n", ret);
> >
> > because of ret being -EINVAL.
> >
> > Signed-off-by: Marcel Hamer <marcel@...idxs.se>
> > ---
> >  drivers/usb/dwc3/gadget.c | 2 ++
> >  1 file changed, 2 insertions(+)
> >
> > diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
> > index c7ef218e7a8c..d05a7d630410 100644
> > --- a/drivers/usb/dwc3/gadget.c
> > +++ b/drivers/usb/dwc3/gadget.c
> > @@ -1972,6 +1972,8 @@ static int __dwc3_gadget_wakeup(struct dwc3 *dwc)
> >  	switch (link_state) {
> >  	case DWC3_LINK_STATE_RESET:
> >  	case DWC3_LINK_STATE_RX_DET:	/* in HS, means Early Suspend */
> > +	case DWC3_LINK_STATE_U1:
> > +	case DWC3_LINK_STATE_U2:
> 
> I think this was fixed recently by Thinh.
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git/commit/?h=usb-next&id=c560e76319a94a3b9285bc426c609903408e4826
> 
> -- 
> balbi

Great, I missed that. Thank you for clarifying this.

Kind regards,

Marcel