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usb: dwc3: gadget: Issue END_TRANSFER to retry isoc transfer 

After a number of unsuccessful start isoc attempts due to bus-expiry
status, issue END_TRANSFER command and retry on the next XferNotReady
event.

Signed-off-by: Thinh Nguyen <thinhn@synopsys.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>
This commit is contained in:
Thinh Nguyen 2020-03-29 16:13:10 -07:00 committed by Felipe Balbi
parent 9bc3395c24
commit 36f05d36b0
1 changed files with 35 additions and 1 deletions
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36
drivers/usb/dwc3/gadget.c
View File

@ -1413,7 +1413,8 @@ static int __dwc3_gadget_start_isoc(struct dwc3_ep *dep)
int ret;
int i;
if (list_empty(&dep->pending_list)) {
if (list_empty(&dep->pending_list) &&
list_empty(&dep->started_list)) {
dep->flags |= DWC3_EP_PENDING_REQUEST;
return -EAGAIN;
}
@ -1436,6 +1437,27 @@ static int __dwc3_gadget_start_isoc(struct dwc3_ep *dep)
break;
}
/*
* After a number of unsuccessful start attempts due to bus-expiry
* status, issue END_TRANSFER command and retry on the next XferNotReady
* event.
*/
if (ret == -EAGAIN) {
struct dwc3_gadget_ep_cmd_params params;
u32 cmd;
cmd = DWC3_DEPCMD_ENDTRANSFER |
DWC3_DEPCMD_CMDIOC |
DWC3_DEPCMD_PARAM(dep->resource_index);
dep->resource_index = 0;
memset(&params, 0, sizeof(params));
ret = dwc3_send_gadget_ep_cmd(dep, cmd, &params);
if (!ret)
dep->flags |= DWC3_EP_END_TRANSFER_PENDING;
}
return ret;
}
@ -2663,6 +2685,18 @@ static void dwc3_gadget_endpoint_transfer_not_ready(struct dwc3_ep *dep,
const struct dwc3_event_depevt *event)
{
dwc3_gadget_endpoint_frame_from_event(dep, event);
/*
* The XferNotReady event is generated only once before the endpoint
* starts. It will be generated again when END_TRANSFER command is
* issued. For some controller versions, the XferNotReady event may be
* generated while the END_TRANSFER command is still in process. Ignore
* it and wait for the next XferNotReady event after the command is
* completed.
*/
if (dep->flags & DWC3_EP_END_TRANSFER_PENDING)
return;
(void) __dwc3_gadget_start_isoc(dep);
}