ASoC: Only do WM8994 bias off transition from standby

Otherwise we may try to power down multiple times when the using
idle bias off and the driver is removed.

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

diff --git a/sound/soc/codecs/wm8994.c b/sound/soc/codecs/wm8994.c
index c80218f..f8355ac 100644 (file)
--- a/sound/soc/codecs/wm8994.c
+++ b/sound/soc/codecs/wm8994.c
@@ -3007,34 +3007,39 @@ static int wm8994_set_bias_level(struct snd_soc_codec *codec,
                break;
 
        case SND_SOC_BIAS_OFF:
-               /* Switch over to startup biases */
-               snd_soc_update_bits(codec, WM8994_ANTIPOP_2,
-                                   WM8994_BIAS_SRC | WM8994_STARTUP_BIAS_ENA |
-                                   WM8994_VMID_BUF_ENA |
-                                   WM8994_VMID_RAMP_MASK,
-                                   WM8994_BIAS_SRC | WM8994_STARTUP_BIAS_ENA |
-                                   WM8994_VMID_BUF_ENA |
-                                   (1 << WM8994_VMID_RAMP_SHIFT));
-
-               /* Disable main biases */
-               snd_soc_update_bits(codec, WM8994_POWER_MANAGEMENT_1,
-                                   WM8994_BIAS_ENA | WM8994_VMID_SEL_MASK, 0);
+               if (codec->bias_level == SND_SOC_BIAS_STANDBY) {
+                       /* Switch over to startup biases */
+                       snd_soc_update_bits(codec, WM8994_ANTIPOP_2,
+                                           WM8994_BIAS_SRC |
+                                           WM8994_STARTUP_BIAS_ENA |
+                                           WM8994_VMID_BUF_ENA |
+                                           WM8994_VMID_RAMP_MASK,
+                                           WM8994_BIAS_SRC |
+                                           WM8994_STARTUP_BIAS_ENA |
+                                           WM8994_VMID_BUF_ENA |
+                                           (1 << WM8994_VMID_RAMP_SHIFT));
 
-               /* Discharge line */
-               snd_soc_update_bits(codec, WM8994_ANTIPOP_1,
-                                   WM8994_LINEOUT1_DISCH |
-                                   WM8994_LINEOUT2_DISCH,
-                                   WM8994_LINEOUT1_DISCH |
-                                   WM8994_LINEOUT2_DISCH);
+                       /* Disable main biases */
+                       snd_soc_update_bits(codec, WM8994_POWER_MANAGEMENT_1,
+                                           WM8994_BIAS_ENA |
+                                           WM8994_VMID_SEL_MASK, 0);
 
-               msleep(5);
+                       /* Discharge line */
+                       snd_soc_update_bits(codec, WM8994_ANTIPOP_1,
+                                           WM8994_LINEOUT1_DISCH |
+                                           WM8994_LINEOUT2_DISCH,
+                                           WM8994_LINEOUT1_DISCH |
+                                           WM8994_LINEOUT2_DISCH);
 
-               /* Switch off startup biases */
-               snd_soc_update_bits(codec, WM8994_ANTIPOP_2,
-                                   WM8994_BIAS_SRC | WM8994_STARTUP_BIAS_ENA |
-                                   WM8994_VMID_BUF_ENA |
-                                   WM8994_VMID_RAMP_MASK, 0);
+                       msleep(5);
 
+                       /* Switch off startup biases */
+                       snd_soc_update_bits(codec, WM8994_ANTIPOP_2,
+                                           WM8994_BIAS_SRC |
+                                           WM8994_STARTUP_BIAS_ENA |
+                                           WM8994_VMID_BUF_ENA |
+                                           WM8994_VMID_RAMP_MASK, 0);
+               }
                break;
        }
        codec->bias_level = level;