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>

diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c
index bc3b3fda5000d94813d51bade73eac5f2a2b0b70..c4066cd77e47345bc1f31791ba9955c80a12d452 100644 (file)
--- 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);
        }