[PATCH 3.16 015/370] usb: dwc3: gadget: set PCM1 field of isochronous-first TRBs

Ben Hutchings
2017-03-10T14:34:46Z

From: Felipe Balbi <felipe.balbi@linux.intel.com>

commit 6b9018d4c1e5c958625be94a160a5984351d4632 upstream.

In case of High-Speed, High-Bandwidth endpoints, we
need to tell DWC3 that we have more than one packet
per interval. We do that by setting PCM1 field of
Isochronous-First TRB.

Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -863,6 +863,8 @@ static void dwc3_prepare_one_trb(struct
{
struct dwc3 *dwc = dep->dwc;
struct dwc3_trb *trb;
+ struct usb_gadget *gadget = &dwc->gadget;
+ enum usb_device_speed speed = gadget->speed;

dev_vdbg(dwc->dev, "%s: req %p dma %08llx length %d%s%s\n",
dep->name, req, (unsigned long long) dma,
@@ -895,10 +897,16 @@ static void dwc3_prepare_one_trb(struct
break;

case USB_ENDPOINT_XFER_ISOC:
- if (!node)
+ if (!node) {
trb->ctrl = DWC3_TRBCTL_ISOCHRONOUS_FIRST;
- else
+
+ if (speed == USB_SPEED_HIGH) {
+ struct usb_ep *ep = &dep->endpoint;
+ trb->size |= DWC3_TRB_SIZE_PCM1(ep->mult - 1);
+ }
+ } else {
trb->ctrl = DWC3_TRBCTL_ISOCHRONOUS;
+ }
break;