Hi Felipe,
On 4/9/2018 4:28 AM, Felipe Balbi wrote:
> In case we get an event with status set to Missed Isoc, this means we
> have missed an isochronous interval and should issue End Transfer
> command and wait for the following XferNotReady.
Why does DWC3 need to issue End Transfer if there are still queued requests?
>
> Let's do that early, rather than late.
>
> Signed-off-by: Felipe Balbi <felipe.ba...@linux.intel.com>
> ---
> drivers/usb/dwc3/core.h | 5 +++--
> drivers/usb/dwc3/gadget.c | 14 +++++++++++---
> 2 files changed, 14 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
> index 5ee895113906..8862118c3b79 100644
> --- a/drivers/usb/dwc3/core.h
> +++ b/drivers/usb/dwc3/core.h
> @@ -1192,11 +1192,12 @@ struct dwc3_event_depevt {
> /* Within XferNotReady */
> #define DEPEVT_STATUS_TRANSFER_ACTIVE BIT(3)
>
> -/* Within XferComplete */
> +/* Within XferComplete or XferInProgress */
> #define DEPEVT_STATUS_BUSERR BIT(0)
> #define DEPEVT_STATUS_SHORT BIT(1)
> #define DEPEVT_STATUS_IOC BIT(2)
> -#define DEPEVT_STATUS_LST BIT(3)
> +#define DEPEVT_STATUS_LST BIT(3) /* XferComplete */
> +#define DEPEVT_STATUS_MISSED_ISOC BIT(3) /* XferInProgress */
>
> /* Stream event only */
> #define DEPEVT_STREAMEVT_FOUND 1
> diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
> index 0b003367cc7c..ed44b85e59dc 100644
> --- a/drivers/usb/dwc3/gadget.c
> +++ b/drivers/usb/dwc3/gadget.c
> @@ -2361,9 +2361,6 @@ static void
> dwc3_gadget_ep_cleanup_completed_requests(struct dwc3_ep *dep,
> * entry is added into request list.
> */
> dep->flags = DWC3_EP_PENDING_REQUEST;
> - } else {
> - dwc3_stop_active_transfer(dep, true);
> - dep->flags = DWC3_EP_ENABLED;
> }
> }
> }
> @@ -2383,14 +2380,25 @@ static void
> dwc3_gadget_endpoint_transfer_in_progress(struct dwc3_ep *dep,
> {
> struct dwc3 *dwc = dep->dwc;
> unsigned status = 0;
> + bool stop = false;
>
> dwc3_gadget_endpoint_frame_from_event(dep, event);
>
> if (event->status & DEPEVT_STATUS_BUSERR)
> status = -ECONNRESET;
>
> + if (event->status & DEPEVT_STATUS_MISSED_ISOC) {
> + status = -ECONNRESET;
Missed isoc shouldn't cause this error status or if it should return an
error status at all. Maybe the status can be -EXDEV, similar to the host
side (/Documentation/driver-api/usb/error-codes.rst).
> + stop = true;
> + }
> +
> dwc3_gadget_ep_cleanup_completed_requests(dep, event, status);
>
> + if (stop) {
> + dwc3_stop_active_transfer(dep, true);
> + dep->flags = DWC3_EP_ENABLED;
> + }
> +
> /*
> * WORKAROUND: This is the 2nd half of U1/U2 -> U0 workaround.
> * See dwc3_gadget_linksts_change_interrupt() for 1st half.
>
BR,
Thinh
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