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.ba...@linux.intel.com>
---
drivers/usb/dwc3/gadget.c | 14 ++++++++++++--
1 file changed, 12 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 997e82dcc55e..5f7e39407892 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -793,6 +793,9 @@ static void dwc3_prepare_one_trb(struct dwc3_ep *dep,
unsigned length, unsigned chain, unsigned node)
{
struct dwc3_trb *trb;
+ struct dwc3 *dwc = dep->dwc;
+ struct usb_gadget *gadget = &dwc->gadget;
+ enum usb_device_speed speed = gadget->speed;
dwc3_trace(trace_dwc3_gadget, "%s: req %p dma %08llx length %d%s",
dep->name, req, (unsigned long long) dma,
@@ -819,10 +822,17 @@ static void dwc3_prepare_one_trb(struct dwc3_ep *dep,
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;
+ u8 pkts = usb_endpoint_isoc_maxp_mult(ep->desc);
+ trb->size |= DWC3_TRB_SIZE_PCM1(pkts - 1);
+ }
+ } else {
trb->ctrl = DWC3_TRBCTL_ISOCHRONOUS;
+ }
/* always enable Interrupt on Missed ISOC */
trb->ctrl |= DWC3_TRB_CTRL_ISP_IMI;
--
2.10.0
--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
