[ARM] 4946/1: pxa3xx: Print an error if we refuse to suspend

The PXA3xx will not suspend if there are no wakeup sources configured.
Print a diagnostic message to make it easier for the user to see what's
happening.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: eric miao <eric.y.miao@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-pxa/pxa3xx.c

@@ -354,8 +354,10 @@ static void pxa3xx_cpu_pm_enter(suspend_state_t state)
 	/*
 	 * Don't sleep if no wakeup sources are defined
 	 */
-	if (wakeup_src == 0)
+	if (wakeup_src == 0) {
+		printk(KERN_ERR "Not suspending: no wakeup sources\n");
 		return;
+	}
 
 	switch (state) {
 	case PM_SUSPEND_STANDBY: