From: Mark Brown <broonie@opensource.wolfsonmicro.com>
Date: Thu, 21 Jan 2010 11:33:20 +0000 (+0000)
Subject: ASoC: Use BIAS_OFF when idle for wm_hubs devices
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=821dd91ec7838e1313d783384ea9ce43510d4013;p=linux-beck.git

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 d73c30536a2c..a67319d9ca7e 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);