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USB: DWC3: Generate interrupt on each TRB as default option

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Currently in case of isoc, interrupt is programmed after each
TRB_NUM/4 ie 8th TRB. A TRB is programmed against each submitted
request from gadget. If we do not want to limit the minimum number of
necessary request to be submitted from gadget then we must receive
interrupt on each TRB submission. There can be such situation with a
gadget working with ping-pong buffer.

If a gadget does not want to receive interrupt after each request
completion then it may set no_interrupt flag.

Signed-off-by: Pratyush Anand <pratyush.anand@st.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Pratyush Anand 2012-05-21 12:42:54 +05:30 committed by Felipe Balbi
parent 85a781019b
commit 206dd69a62
1 changed files with 1 additions and 2 deletions
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3
drivers/usb/dwc3/gadget.c
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@ -766,8 +766,7 @@ static void dwc3_prepare_one_trb(struct dwc3_ep *dep,
case USB_ENDPOINT_XFER_ISOC:
trb->ctrl = DWC3_TRBCTL_ISOCHRONOUS_FIRST;
/* IOC every DWC3_TRB_NUM / 4 so we can refill */
if (!(cur_slot % (DWC3_TRB_NUM / 4)))
if (!req->request.no_interrupt)
trb->ctrl |= DWC3_TRB_CTRL_IOC;
break;