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usb: dwc3: gadget: Wait for transfer completion 

If a transfer is in-progress, any new request should not kick off
another transfer. The driver needs to wait for the current transfer to
complete before starting off the next transfer. Introduce a new flag
DWC3_EP_WAIT_TRANSFER_COMPLETE for this.

Signed-off-by: Thinh Nguyen <thinhn@synopsys.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>
alistair/sunxi64-5.8
Thinh Nguyen 2020-05-05 19:46:57 -07:00 committed by Felipe Balbi
parent 3eaecd0c23
commit e0d19563eb
2 changed files with 9 additions and 1 deletions
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1
drivers/usb/dwc3/core.h
View File

@ -701,6 +701,7 @@ struct dwc3_ep {
#define DWC3_EP_END_TRANSFER_PENDING BIT(4)
#define DWC3_EP_PENDING_REQUEST BIT(5)
#define DWC3_EP_DELAY_START BIT(6)
#define DWC3_EP_WAIT_TRANSFER_COMPLETE BIT(7)
/* This last one is specific to EP0 */
#define DWC3_EP0_DIR_IN BIT(31)

9
drivers/usb/dwc3/gadget.c
View File

@ -1292,6 +1292,9 @@ static int __dwc3_gadget_kick_transfer(struct dwc3_ep *dep)
return ret;
}
if (dep->stream_capable && req->request.is_last)
dep->flags |= DWC3_EP_WAIT_TRANSFER_COMPLETE;
return 0;
}
@ -1498,6 +1501,9 @@ static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req)
list_add_tail(&req->list, &dep->pending_list);
req->status = DWC3_REQUEST_STATUS_QUEUED;
if (dep->flags & DWC3_EP_WAIT_TRANSFER_COMPLETE)
return 0;
/* Start the transfer only after the END_TRANSFER is completed */
if (dep->flags & DWC3_EP_END_TRANSFER_PENDING) {
dep->flags |= DWC3_EP_DELAY_START;
@ -2735,7 +2741,8 @@ static void dwc3_gadget_endpoint_transfer_complete(struct dwc3_ep *dep,
if (event->status & DEPEVT_STATUS_BUSERR)
status = -ECONNRESET;
dwc3_gadget_endpoint_trbs_complete(dep, event, status);
if (dwc3_gadget_endpoint_trbs_complete(dep, event, status))
dep->flags &= ~DWC3_EP_WAIT_TRANSFER_COMPLETE;
}
static void dwc3_gadget_endpoint_transfer_not_ready(struct dwc3_ep *dep,