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usb: dwc3: gadget: Continue to process pending requests

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If there are still pending requests because no TRB was available,
prepare more when started requests are completed.

Introduce dwc3_gadget_ep_should_continue() to check for incomplete and
pending requests to resume updating new TRBs to the controller's TRB
cache.

Signed-off-by: Thinh Nguyen <thinhn@synopsys.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>
This commit is contained in:
Thinh Nguyen 2020-03-31 01:40:42 -07:00 committed by Felipe Balbi
parent ac82b56bda
commit d9feef974e
1 changed files with 21 additions and 3 deletions
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24
drivers/usb/dwc3/gadget.c
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@ -2600,10 +2600,8 @@ static int dwc3_gadget_ep_cleanup_completed_request(struct dwc3_ep *dep,
req->request.actual = req->request.length - req->remaining;
if (!dwc3_gadget_ep_request_completed(req)) {
__dwc3_gadget_kick_transfer(dep);
if (!dwc3_gadget_ep_request_completed(req))
goto out;
}
dwc3_gadget_giveback(dep, req, status);
@ -2627,6 +2625,24 @@ static void dwc3_gadget_ep_cleanup_completed_requests(struct dwc3_ep *dep,
}
}
static bool dwc3_gadget_ep_should_continue(struct dwc3_ep *dep)
{
struct dwc3_request *req;
if (!list_empty(&dep->pending_list))
return true;
/*
* We only need to check the first entry of the started list. We can
* assume the completed requests are removed from the started list.
*/
req = next_request(&dep->started_list);
if (!req)
return false;
return !dwc3_gadget_ep_request_completed(req);
}
static void dwc3_gadget_endpoint_frame_from_event(struct dwc3_ep *dep,
const struct dwc3_event_depevt *event)
{
@ -2656,6 +2672,8 @@ static void dwc3_gadget_endpoint_transfer_in_progress(struct dwc3_ep *dep,
if (stop)
dwc3_stop_active_transfer(dep, true, true);
else if (dwc3_gadget_ep_should_continue(dep))
__dwc3_gadget_kick_transfer(dep);
/*
* WORKAROUND: This is the 2nd half of U1/U2 -> U0 workaround.