ASoC: Intel: Skylake: power down all link in suspend

This ensures that the link is not requesting any clock and the
PLL can turn off. The link is powered when controller is brought
out of reset.
Signed-off-by: Jeeja KP <jeeja.kp@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/intel/skylake/skl.c

@@ -173,6 +173,9 @@ static int skl_runtime_suspend(struct device *dev)
 
 	/* enable controller wake up event */
 	snd_hdac_chip_updatew(bus, WAKEEN, 0, STATESTS_INT_MASK);
+
+	snd_hdac_ext_bus_link_power_down_all(ebus);
+
 	ret = skl_suspend_dsp(skl);
 	if (ret < 0)
 		return ret;