OMAP2+: hwmod: Enable module in shutdown to access sysconfig

When calling the shutdown, the module may be already in idle.
Accessing the sysconfig register will then lead to a crash.
In that case, re-enable the module in order to allow the access
to the sysconfig register.
Signed-off-by: Miguel Vadillo <vadillo@ti.com>
Signed-off-by: Benoit Cousson <b-cousson@ti.com>
Signed-off-by: Paul Walmsley <paul@pwsan.com>

arch/arm/mach-omap2/omap_hwmod.c

@@ -1396,8 +1396,11 @@ static int _shutdown(struct omap_hwmod *oh)
 		}
 	}
 
-	if (oh->class->sysc)
+	if (oh->class->sysc) {
+		if (oh->_state == _HWMOD_STATE_IDLE)
+			_enable(oh);
 		_shutdown_sysc(oh);
+	}
 
 	/*
 	 * If an IP contains only one HW reset line, then assert it