OMAP3+: SR: enable/disable SR only on need

Since we already know the state of the autocomp enablement, we can
see if the requested state is different from the current state and
enable/disable SR only on the need basis.
Signed-off-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Kevin Hilman <khilman@ti.com>

arch/arm/mach-omap2/smartreflex.c

@@ -807,10 +807,13 @@ static int omap_sr_autocomp_store(void *data, u64 val)
 		return -EINVAL;
 	}
 
+	/* control enable/disable only if there is a delta in value */
+	if (sr_info->autocomp_active != val) {
 		if (!val)
 			sr_stop_vddautocomp(sr_info);
 		else
 			sr_start_vddautocomp(sr_info);
+	}
 
 	return 0;
 }