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usb: dwc3: gadget: set PCM1 field of isochronous-first TRBs 

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.

Cc: <stable@vger.kernel.org>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
hifive-unleashed-5.1
Felipe Balbi 2016-09-22 11:01:01 +03:00
parent eaa496ffaa
commit 6b9018d4c1
1 changed files with 11 additions and 2 deletions
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13
drivers/usb/dwc3/gadget.c
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@ -771,6 +771,9 @@ 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,
@ -798,10 +801,16 @@ 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;
trb->size |= DWC3_TRB_SIZE_PCM1(ep->mult - 1);
}
} else {
trb->ctrl = DWC3_TRBCTL_ISOCHRONOUS;
}
/* always enable Interrupt on Missed ISOC */
trb->ctrl |= DWC3_TRB_CTRL_ISP_IMI;