From: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Date: Thu, 24 Oct 2019 02:15:55 +0000 (-0700)
Subject: usb: dwc3: gadget: Clear DCTL.ULSTCHNGREQ before set
X-Git-Tag: v5.6-rc1~140^2~62
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2e708fa3b8987a6a76853cd4deaee990095a7b20;p=thirdparty%2Fkernel%2Fstable.git

usb: dwc3: gadget: Clear DCTL.ULSTCHNGREQ before set

Send a no-action link state change request before the actual request
so DWC3 can send the same request whenever we call
dwc3_gadget_set_link_state().

Signed-off-by: Thinh Nguyen <thinhn@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index caf12fd71e73a..edc478c208464 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -111,6 +111,9 @@ int dwc3_gadget_set_link_state(struct dwc3 *dwc, enum dwc3_link_state state)
 	reg = dwc3_readl(dwc->regs, DWC3_DCTL);
 	reg &= ~DWC3_DCTL_ULSTCHNGREQ_MASK;
 
+	/* set no action before sending new link state change */
+	dwc3_writel(dwc->regs, DWC3_DCTL, reg);
+
 	/* set requested state */
 	reg |= DWC3_DCTL_ULSTCHNGREQ(state);
 	dwc3_writel(dwc->regs, DWC3_DCTL, reg);