ASoC: dapm: Fix SUSPEND -> OFF bias sequence

Currently when the DAPM context bias level is SUSPEND and the target bias level
is OFF dapm_pre_sequence_async() will first transition to PREPARE and
dapm_post_sequence_async() will then transition back from PREPARE to STANDBY and
then to OFF.

This patch makes sure that dapm_pre_sequence_async() only transitions to PREPARE
when either going to ON or away from ON. This avoids the extra unnecessary
transitions.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@linaro.org>

1 files changed, 5 insertions, 2 deletions

diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c
index ef78a699bb20..6d6ceee447d5 100644
--- a/sound/soc/soc-dapm.c
+++ b/sound/soc/soc-dapm.c
@@ -1612,8 +1612,11 @@ static void dapm_pre_sequence_async(void *data, async_cookie_t cookie)
                                 "ASoC: Failed to turn on bias: %d\n", ret);
         }
 
-        /* Prepare for a STADDBY->ON or ON->STANDBY transition */
-        if (d->bias_level != d->target_bias_level) {
+        /* Prepare for a transition to ON or away from ON */
+        if ((d->target_bias_level == SND_SOC_BIAS_ON &&
+             d->bias_level != SND_SOC_BIAS_ON) ||
+            (d->target_bias_level != SND_SOC_BIAS_ON &&
+             d->bias_level == SND_SOC_BIAS_ON)) {
                 ret = snd_soc_dapm_set_bias_level(d, SND_SOC_BIAS_PREPARE);
                 if (ret != 0)
                         dev_err(d->dev,