musb_hdrc: Make HNP more reliable

Sometimes we get both SUSPEND and DISCONNECT the same time.
In that case DISCONNECT must be ignored or else the HNP connection
will break right away.
Signed-off-by: Tony Lindgren <tony@atomide.com>

drivers/usb/musb/musb_core.c

@@ -321,6 +321,7 @@ void musb_otg_timer_func(unsigned long data)
 		musb_hnp_stop(musb);
 		break;
 	}
+	musb->ignore_disconnect = 0;
 	spin_unlock_irqrestore(&musb->lock, flags);
 }
 
@@ -656,8 +657,13 @@ static irqreturn_t musb_stage0_irq(struct musb * musb, u8 int_usb,
 			DBG(1, "BUS RESET as %s\n", otg_state_string(musb));
 			switch (musb->xceiv.state) {
 #ifdef CONFIG_USB_OTG
+			case OTG_STATE_A_SUSPEND:
+				musb->ignore_disconnect = 1;
+				musb_g_reset(musb);
+				/* FALLTHROUGH */
 			case OTG_STATE_A_WAIT_BCON:	/* OPT TD.4.7-900ms */
-				DBG(1, "HNP: Setting timer as a_wait_bcon\n");
+				DBG(1, "HNP: Setting timer as %s\n",
+						otg_state_string(musb));
 				musb_otg_timer.data = (unsigned long)musb;
 				mod_timer(&musb_otg_timer, jiffies
 					+ msecs_to_jiffies(100));