From 307bc11fcdf9f911a1adacf9e77fe1c490041ee3 Mon Sep 17 00:00:00 2001
From: Minas Harutyunyan <Minas.Harutyunyan@synopsys.com>
Date: Tue, 11 Jul 2017 14:25:13 +0400
Subject: [PATCH] usb: dwc2: gadget: On USB RESET reset device address to zero

Reseted DEVADDR field in DCFG to zero on USB RESET.

Device address in DCFG register does not reset to zero,
which required to pass enumeration, after disconnect and
reconnect.

Acked-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Minas Harutyunyan <hminas@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
---
 drivers/usb/dwc2/gadget.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c
index bc3b3fda5000..c4066cd77e47 100644
--- a/drivers/usb/dwc2/gadget.c
+++ b/drivers/usb/dwc2/gadget.c
@@ -3573,6 +3573,9 @@ irq_retry:
 		/* Report disconnection if it is not already done. */
 		dwc2_hsotg_disconnect(hsotg);
 
+		/* Reset device address to zero */
+		__bic32(hsotg->regs + DCFG, DCFG_DEVADDR_MASK);
+
 		if (usb_status & GOTGCTL_BSESVLD && connected)
 			dwc2_hsotg_core_init_disconnected(hsotg, true);
 	}