On 8/17/2018 5:26 AM, Anurag Kumar Vulisha wrote:
> To start transfer with another stream id, controller needs to free
> previously allocated transfer resource. This will be automatically
> done by the controller at the time of XferComplete Event. This
> patch updates the code to issue XferComplete event once all transfers
> are done by setting LST bit in the ctrl field of the last TRB.
>
> Signed-off-by: Anurag Kumar Vulisha <anurag.kumar.vuli...@xilinx.com>
> ---
> Changes in v2:
> 1. None
> ---
> drivers/usb/dwc3/gadget.c | 19 ++++++++++++++++---
> 1 file changed, 16 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
> index efc6e13..b3e9e7f 100644
> --- a/drivers/usb/dwc3/gadget.c
> +++ b/drivers/usb/dwc3/gadget.c
> @@ -571,7 +571,8 @@ static int dwc3_gadget_set_ep_config(struct dwc3_ep *dep,
> unsigned int action)
>
> if (usb_ss_max_streams(comp_desc) && usb_endpoint_xfer_bulk(desc)) {
> params.param1 |= DWC3_DEPCFG_STREAM_CAPABLE
> - | DWC3_DEPCFG_STREAM_EVENT_EN;
> + | DWC3_DEPCFG_STREAM_EVENT_EN
> + | DWC3_DEPCFG_XFER_COMPLETE_EN;
> dep->stream_capable = true;
> }
>
> @@ -999,6 +1000,15 @@ static void __dwc3_prepare_one_trb(struct dwc3_ep *dep,
> struct dwc3_trb *trb,
> if (chain)
> trb->ctrl |= DWC3_TRB_CTRL_CHN;
>
> + /*
> + * To issue start transfer on another stream, controller need to free
> + * previously acquired transfer resource. Setting the LST bit in
> + * last TRB makes the controller clear transfer resource for that
> + * endpoint, allowing to start another stream on that endpoint.
> + */
> + else if (dep->stream_capable)
> + trb->ctrl |= DWC3_TRB_CTRL_LST;
> +
> if (usb_endpoint_xfer_bulk(dep->endpoint.desc) && dep->stream_capable)
> trb->ctrl |= DWC3_TRB_CTRL_SID_SOFN(stream_id);
>
> @@ -2268,7 +2278,7 @@ static int dwc3_gadget_ep_reclaim_completed_trb(struct
> dwc3_ep *dep,
> if (event->status & DEPEVT_STATUS_SHORT && !chain)
> return 1;
>
> - if (event->status & DEPEVT_STATUS_IOC)
> + if (event->status & (DEPEVT_STATUS_IOC | DEPEVT_STATUS_LST))
> return 1;
>
> return 0;
> @@ -2457,6 +2467,10 @@ static void dwc3_endpoint_interrupt(struct dwc3 *dwc,
> }
>
> switch (event->endpoint_event) {
> + case DWC3_DEPEVT_XFERCOMPLETE:
> + if (!dep->stream_capable)
> + break;
> + dep->flags &= ~DWC3_EP_TRANSFER_STARTED;
Add this: /* Falls Through */
> case DWC3_DEPEVT_XFERINPROGRESS:
> dwc3_gadget_endpoint_transfer_in_progress(dep, event);
> break;
> @@ -2472,7 +2486,6 @@ static void dwc3_endpoint_interrupt(struct dwc3 *dwc,
> }
> break;
> case DWC3_DEPEVT_STREAMEVT:
> - case DWC3_DEPEVT_XFERCOMPLETE:
> case DWC3_DEPEVT_RXTXFIFOEVT:
> break;
> }
Thinh
