usb: r8a66597-udc disable interrupts on shutdown fix

This patch improves the disable_controller() function in the
r8a66597-udc driver to disable all interrupts and also clear
status flags. With this patch in place the driver survives
kexec.

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

drivers/usb/gadget/r8a66597-udc.c

@@ -614,8 +614,17 @@ static void disable_controller(struct r8a66597 *r8a66597)
 	if (r8a66597->pdata->on_chip) {
 		r8a66597_bset(r8a66597, SCKE, SYSCFG0);
 
+		/* disable interrupts */
 		r8a66597_write(r8a66597, 0, INTENB0);
 		r8a66597_write(r8a66597, 0, INTENB1);
+		r8a66597_write(r8a66597, 0, BRDYENB);
+		r8a66597_write(r8a66597, 0, BEMPENB);
+		r8a66597_write(r8a66597, 0, NRDYENB);
+
+		/* clear status */
+		r8a66597_write(r8a66597, 0, BRDYSTS);
+		r8a66597_write(r8a66597, 0, NRDYSTS);
+		r8a66597_write(r8a66597, 0, BEMPSTS);
 
 		r8a66597_bclr(r8a66597, USBE, SYSCFG0);
 		r8a66597_bclr(r8a66597, SCKE, SYSCFG0);