usb: dwc3: gadget: prevent DCTL register corruption



If we don't read out the contents of the register
(in order to reinitialize 'reg' variable) we will
be writing unknown contents to the DCTL register
whenever we try to use dwc3_gadget_wakeup() function.

Signed-off-by: Felipe Balbi <balbi@ti.com>

parent 7acd85e0

drivers/usb/dwc3/gadget.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -1307,6 +1307,7 @@ static int dwc3_gadget_wakeup(struct usb_gadget *g)
		/* Recent versions do this automatically */
		if (dwc->revision < DWC3_REVISION_194A) {
		/* write zeroes to Link Change Request */
		reg = dwc3_readl(dwc->regs, DWC3_DCTL);
		reg &= ~DWC3_DCTL_ULSTCHNGREQ_MASK;
		dwc3_writel(dwc->regs, DWC3_DCTL, reg);
		}