usb: dwc3: gadget: check if dep->frame_number is still valid
Gadget driver may take an unbounded amount of time to queue requests after XferNotReady. This is important for isochronous endpoints which need to be started for a specific (micro-)frame. If we fail to start a transfer for isochronous endpoint, let's try queueing to a future interval and see if that helps. We will stop trying if we fail a start transfer for 5 intervals in the future. Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
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@ -37,6 +37,7 @@
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#define DWC3_EP0_SETUP_SIZE 512
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#define DWC3_ENDPOINTS_NUM 32
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#define DWC3_XHCI_RESOURCES_NUM 2
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#define DWC3_ISOC_MAX_RETRIES 5
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#define DWC3_SCRATCHBUF_SIZE 4096 /* each buffer is assumed to be 4KiB */
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#define DWC3_EVENT_BUFFERS_SIZE 4096
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@ -27,7 +27,7 @@
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#include "gadget.h"
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#include "io.h"
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#define DWC3_ALIGN_FRAME(d) (((d)->frame_number + (d)->interval) \
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#define DWC3_ALIGN_FRAME(d, n) (((d)->frame_number + ((d)->interval * (n))) \
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& ~((d)->interval - 1))
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/**
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@ -1384,6 +1384,8 @@ static int dwc3_gadget_start_isoc_quirk(struct dwc3_ep *dep)
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static int __dwc3_gadget_start_isoc(struct dwc3_ep *dep)
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{
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struct dwc3 *dwc = dep->dwc;
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int ret;
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int i;
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if (list_empty(&dep->pending_list)) {
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dep->flags |= DWC3_EP_PENDING_REQUEST;
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@ -1400,8 +1402,15 @@ static int __dwc3_gadget_start_isoc(struct dwc3_ep *dep)
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return dwc3_gadget_start_isoc_quirk(dep);
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}
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dep->frame_number = DWC3_ALIGN_FRAME(dep);
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return __dwc3_gadget_kick_transfer(dep);
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for (i = 0; i < DWC3_ISOC_MAX_RETRIES; i++) {
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dep->frame_number = DWC3_ALIGN_FRAME(dep, i + 1);
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ret = __dwc3_gadget_kick_transfer(dep);
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if (ret != -EAGAIN)
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break;
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}
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return ret;
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}
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static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req)
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