Hi, Baolin Wang <baolin.w...@linaro.org> writes: > diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c > index 057739d..22787b6 100644 > --- a/drivers/usb/dwc3/core.c > +++ b/drivers/usb/dwc3/core.c > @@ -999,6 +999,7 @@ static int dwc3_probe(struct platform_device *pdev) > goto err0; > > spin_lock_init(&dwc->lock); > + init_completion(&dwc->ep0_completed);
this should be done only when gadget is required; meaning that this
should be moved to dwc3_gadget_init()
> diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
> index b2317e7..858e661 100644
> --- a/drivers/usb/dwc3/core.h
> +++ b/drivers/usb/dwc3/core.h
[...]
> @@ -843,6 +844,7 @@ struct dwc3 {
> dma_addr_t ep0_bounce_addr;
> dma_addr_t scratch_addr;
> struct dwc3_request ep0_usb_req;
> + struct completion ep0_completed;
when you call this "ep0_completed" it seems like you're defining a flag,
but you're not :) How about "ep0_in_setup" instead? That conveys the
idea that we're waiting for ep0 to reach setup phase.
> diff --git a/drivers/usb/dwc3/ep0.c b/drivers/usb/dwc3/ep0.c
> index 632e5a4..baf932d 100644
> --- a/drivers/usb/dwc3/ep0.c
> +++ b/drivers/usb/dwc3/ep0.c
> @@ -286,6 +286,7 @@ static void dwc3_ep0_stall_and_restart(struct dwc3 *dwc)
>
> dwc->ep0state = EP0_SETUP_PHASE;
> dwc3_ep0_out_start(dwc);
> + complete(&dwc->ep0_completed);
no, this is wrong. I see what you're trying to do here, but we don't
want to duplicate this call to complete() right? One thing we can
realize is that *always* after STATUS phase or after a STALL, we will go
through dwc3_ep0_out_start(), this mean we can call complete() before
starting the following SETUP phase.
Single place to call complete() ;-)
> diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
> index 1a33308..c9026ce 100644
> --- a/drivers/usb/dwc3/gadget.c
> +++ b/drivers/usb/dwc3/gadget.c
> @@ -1441,6 +1441,15 @@ static int dwc3_gadget_run_stop(struct dwc3 *dwc, int
> is_on, int suspend)
> if (pm_runtime_suspended(dwc->dev))
> return 0;
>
> + /*
> + * Per databook, when we want to stop the gadget, if a control transfer
> + * is still in process, complete it and get the core into setup phase.
> + */
> + if (!is_on && dwc->ep0state != EP0_SETUP_PHASE) {
> + reinit_completion(&dwc->ep0_completed);
this seems unnecessary to me. Also, why return here so the caller has to
wait? You could just have called wait_for_completion() here straight
away:
if (!is_on && dwc->ep0state != EP0_SETUP_PHASE) {
/* should this be interruptible? */
ret = wait_for_completion_timeout(&dwc->ep0_in_setup,
msecs_to_jiffies(500));
if (ret == 0) {
dwc3_trace(trace_dwc3_gadget, "RUN/STOP timeout");
return -ETIMEDOUT;
}
}
There's also no need for that "try_again" trickery. We either can halt
the controller within 500ms or we cannot.
--
balbi
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