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 caf12fd..edc478c 100644 (file)
--- 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);