diff options
| author | Pratyush Anand <pratyush.anand@st.com> | 2013-01-14 10:29:34 (GMT) |
|---|---|---|
| committer | Felipe Balbi <balbi@ti.com> | 2013-01-18 12:29:42 (GMT) |
| commit | cdc359dd87ab6c39a67dab724fd0b61c16e6f08b (patch) | |
| tree | 20aafb531e0e393848637e50a785a9b38a7073fa /drivers/usb/dwc3/gadget.c | |
| parent | 15f86bde29f0fdfb877d9c753547fa2e2f5ef1fe (diff) | |
| download | linux-cdc359dd87ab6c39a67dab724fd0b61c16e6f08b.tar.xz | |
usb: dwc3: gadget: fix isoc END TRANSFER Condition
There were still some corner cases where isoc transfer was not able to
restart, specially when missed isoc does not happen , and in fact gadget does
not queue any new request during giveback.
Cleanup function calls giveback first, which provides a way to queue
another request to gadget. But gadget did not had any data. So , it did
not call ep_queue. To twist it further, gadget did not queue till
cleanup for last queued TRB is called. If we ever reach this scenario,
we must call END TRANSFER, so that we receive a new xfernotready with
information about current microframe number.
Also insure that there is no request submitted to core when issuing END
TRANSFER.
Cc: <stable@vger.kernel.org> # v3.8
Signed-off-by: Pratyush Anand <pratyush.anand@st.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Diffstat (limited to 'drivers/usb/dwc3/gadget.c')
| -rw-r--r-- | drivers/usb/dwc3/gadget.c | 23 |
1 files changed, 18 insertions, 5 deletions
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index c4ffb35..e60e72c 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -1089,7 +1089,10 @@ static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req) * notion of current microframe. */ if (usb_endpoint_xfer_isoc(dep->endpoint.desc)) { - dwc3_stop_active_transfer(dwc, dep->number); + if (list_empty(&dep->req_queued)) { + dwc3_stop_active_transfer(dwc, dep->number); + dep->flags = DWC3_EP_ENABLED; + } return 0; } @@ -1727,10 +1730,20 @@ static int dwc3_cleanup_done_reqs(struct dwc3 *dwc, struct dwc3_ep *dep, break; } while (1); - if (list_empty(&dep->req_queued) && - (dep->flags & DWC3_EP_MISSED_ISOC)) { - dwc3_stop_active_transfer(dwc, dep->number); - dep->flags &= ~DWC3_EP_MISSED_ISOC; + if (usb_endpoint_xfer_isoc(dep->endpoint.desc) && + list_empty(&dep->req_queued)) { + if (list_empty(&dep->request_list)) { + /* + * If there is no entry in request list then do + * not issue END TRANSFER now. Just set PENDING + * flag, so that END TRANSFER is issued when an + * entry is added into request list. + */ + dep->flags = DWC3_EP_PENDING_REQUEST; + } else { + dwc3_stop_active_transfer(dwc, dep->number); + dep->flags = DWC3_EP_ENABLED; + } return 1; } |