greybus: arche-platform: assert wake-detect to complete WAKE_OUT event

After SVC generates WAKE_OUT (pulling wake-detect pin low) and APB is
brought out of reset, we need to assert wake-detect again to complete
SVC WAKE_OUT logic.

Testing Done:
- Used for DB3.5/EVT1.5 hardware during bringup
- Regression tested on DB3.1+ES2, DB3.1+ES3
Signed-off-by: Michael Scott <michael.scott@linaro.org>
Reviewed-by: Vaibhav Hiremath <vaibhav.hiremath@linaro.org>
Tested-by: Vaibhav Hiremath <vaibhav.hiremath@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/arche-platform.c

@@ -79,10 +79,12 @@ static void svc_delayed_work(struct work_struct *work)
 
 	if (timeout >= 0) {
 		ret = of_platform_populate(np, NULL, NULL, dev);
-		if (!ret)
-			/* Should we set wake_detect gpio to output again? */
+		if (!ret) {
+			/* re-assert wake_detect to confirm SVC WAKE_OUT */
+			gpio_direction_output(arche_pdata->wake_detect_gpio, 1);
 			return;
 		}
+	}
 
 	/* FIXME: We may want to limit retries here */
 	gpio_direction_output(arche_pdata->wake_detect_gpio, 0);