Commit af771d73 authored Jan 26, 2017 by John Youn Committed by Felipe Balbi Apr 11, 2017

usb: dwc3: gadget: Fix starting microframe for ISOC

The gadget wants to set the starting microframe for the first ISOC TRB
to 4 microframes in the future, but it does so by multiplying the
dep->interval. This only works if dep->interval = 1. For other intervals
it will put it 4 *intervals* in the future which may be way too much.

Fix so that it always adds just one interval or at least 4 microframes.

Signed-off-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

parent 3a932b0f

drivers/usb/dwc3/gadget.c

+5 −2

Original line number	Diff line number	Diff line
		@@ -1184,8 +1184,11 @@ static void __dwc3_gadget_start_isoc(struct dwc3 *dwc,
		return;
		}

		/* 4 micro frames in the future */
		uf = cur_uf + dep->interval * 4;
		/*
		* Schedule the first trb for one interval in the future or at
		* least 4 microframes.
		*/
		uf = cur_uf + max_t(u32, 4, dep->interval);

		__dwc3_gadget_kick_transfer(dep, uf);
		}