From 821dd91ec7838e1313d783384ea9ce43510d4013 Mon Sep 17 00:00:00 2001
From: Mark Brown <broonie@opensource.wolfsonmicro.com>
Date: Thu, 21 Jan 2010 11:33:20 +0000
Subject: ASoC: Use BIAS_OFF when idle for wm_hubs devices

This provides a small power saving when audio is inactive.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>

diff --git a/sound/soc/codecs/wm_hubs.c b/sound/soc/codecs/wm_hubs.c
index d73c305..a67319d 100644
--- a/sound/soc/codecs/wm_hubs.c
+++ b/sound/soc/codecs/wm_hubs.c
@@ -753,6 +753,12 @@ int wm_hubs_handle_analogue_pdata(struct snd_soc_codec *codec,
 				    WM8993_LINEOUT2_MODE,
 				    WM8993_LINEOUT2_MODE);
 
+	/* If the line outputs are differential then we aren't presenting
+	 * VMID as an output and can disable it.
+	 */
+	if (lineout1_diff && lineout2_diff)
+		codec->idle_bias_off = 1;
+
 	if (lineout1fb)
 		snd_soc_update_bits(codec, WM8993_ADDITIONAL_CONTROL,
 				    WM8993_LINEOUT1_FB, WM8993_LINEOUT1_FB);
-- 
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