OMAP: UART: use non-locking versions of hwmod enable/idle functions

Since the UART enable/idle is done during the idle path (with
interrupts disabled), use the non-locking versions of the hwmod
enable/idle functions.

Signed-off-by: Govindraj.R <govindraj.raja@ti.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>

arch/arm/mach-omap2/serial.c

@@ -105,10 +105,29 @@ struct omap_uart_state {
 static LIST_HEAD(uart_list);
 static u8 num_uarts;
 
+/*
+ * Since these idle/enable hooks are used in the idle path itself
+ * which has interrupts disabled, use the non-locking versions of
+ * the hwmod enable/disable functions.
+ */
+static int uart_idle_hwmod(struct omap_device *od)
+{
+	_omap_hwmod_idle(od->hwmods[0]);
+
+	return 0;
+}
+
+static int uart_enable_hwmod(struct omap_device *od)
+{
+	_omap_hwmod_enable(od->hwmods[0]);
+
+	return 0;
+}
+
 static struct omap_device_pm_latency omap_uart_latency[] = {
 	{
-		.deactivate_func = omap_device_idle_hwmods,
-		.activate_func	 = omap_device_enable_hwmods,
+		.deactivate_func = uart_idle_hwmod,
+		.activate_func	 = uart_enable_hwmod,
 		.flags = OMAP_DEVICE_LATENCY_AUTO_ADJUST,
 	},
 };