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 d73c30536a2cd158e09ce0cb760efcfc4db34376..a67319d9ca7e8882f6ca013a7e1e169fe036858c 100644 (file)
--- 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);