Commit 28632b44 authored Nov 14, 2016 by John Youn Committed by Felipe Balbi Nov 18, 2016

usb: dwc3: Workaround for irq mask issue



This is a workaround for STAR 9000961433 which affects only version
3.00a of the DWC_usb3 core. This prevents the controller interrupt from
being masked while handling events. Enabling interrupt moderation allows
us to work around this issue because once the GEVNTCOUNT.count is
written the IRQ is immediately deasserted and won't be asserted again
until GEVNTCOUNT.EHB is cleared.

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

parent cf40b86b

drivers/usb/dwc3/core.c

+11 −0

Original line number	Diff line number	Diff line
		@@ -1004,6 +1004,17 @@ static void dwc3_check_params(struct dwc3 *dwc)
		dwc->imod_interval = 0;
		}

		/*
		* Workaround for STAR 9000961433 which affects only version
		* 3.00a of the DWC_usb3 core. This prevents the controller
		* interrupt from being masked while handling events. IMOD
		* allows us to work around this issue. Enable it for the
		* affected version.
		*/
		if (!dwc->imod_interval &&
		(dwc->revision == DWC3_REVISION_300A))
		dwc->imod_interval = 1;

		/* Check the maximum_speed parameter */
		switch (dwc->maximum_speed) {
		case USB_SPEED_LOW:

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