usb: dwc2: Initialize the USB core for peripheral mode

Initialize the USB driver to peripheral mode when a B-Device connector
is attached.

Signed-off-by: Dinh Nguyen <dinguyen@opensource.altera.com>
Acked-by: Paul Zimmerman <paulz@synopsys.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/dwc2/core.h

@@ -966,6 +966,8 @@ extern int s3c_hsotg_remove(struct dwc2_hsotg *hsotg);
 extern int s3c_hsotg_suspend(struct dwc2_hsotg *dwc2);
 extern int s3c_hsotg_resume(struct dwc2_hsotg *dwc2);
 extern int dwc2_gadget_init(struct dwc2_hsotg *hsotg, int irq);
+extern void s3c_hsotg_core_init_disconnected(struct dwc2_hsotg *dwc2);
+extern void s3c_hsotg_core_connect(struct dwc2_hsotg *hsotg);
 #else
 static inline int s3c_hsotg_remove(struct dwc2_hsotg *dwc2)
 { return 0; }
@@ -975,6 +977,8 @@ static inline int s3c_hsotg_resume(struct dwc2_hsotg *dwc2)
 { return 0; }
 static inline int dwc2_gadget_init(struct dwc2_hsotg *hsotg, int irq)
 { return 0; }
+static inline void s3c_hsotg_core_init_disconnected(struct dwc2_hsotg *dwc2) {}
+static inline void s3c_hsotg_core_connect(struct dwc2_hsotg *hsotg) {}
 #endif
 
 #if IS_ENABLED(CONFIG_USB_DWC2_HOST) || IS_ENABLED(CONFIG_USB_DWC2_DUAL_ROLE)

drivers/usb/dwc2/gadget.c

@@ -2125,7 +2125,7 @@ static int s3c_hsotg_corereset(struct dwc2_hsotg *hsotg)
  *
  * Issue a soft reset to the core, and await the core finishing it.
  */
-static void s3c_hsotg_core_init_disconnected(struct dwc2_hsotg *hsotg)
+void s3c_hsotg_core_init_disconnected(struct dwc2_hsotg *hsotg)
 {
 	s3c_hsotg_corereset(hsotg);
 
@@ -2257,7 +2257,7 @@ static void s3c_hsotg_core_disconnect(struct dwc2_hsotg *hsotg)
 	__orr32(hsotg->regs + DCTL, DCTL_SFTDISCON);
 }
 
-static void s3c_hsotg_core_connect(struct dwc2_hsotg *hsotg)
+void s3c_hsotg_core_connect(struct dwc2_hsotg *hsotg)
 {
 	/* remove the soft-disconnect and let's go */
 	__bic32(hsotg->regs + DCTL, DCTL_SFTDISCON);

drivers/usb/dwc2/hcd.c

@@ -1371,6 +1371,8 @@ static void dwc2_conn_id_status_change(struct work_struct *work)
 		hsotg->op_state = OTG_STATE_B_PERIPHERAL;
 		dwc2_core_init(hsotg, false, -1);
 		dwc2_enable_global_interrupts(hsotg);
+		s3c_hsotg_core_init_disconnected(hsotg);
+		s3c_hsotg_core_connect(hsotg);
 	} else {
 		/* A-Device connector (Host Mode) */
 		dev_dbg(hsotg->dev, "connId A\n");