ASoC: dapm: Check for bias level when powering down

Recent enhancements in the bias management means that we might not be
in standby when the CODEC is idle and can have active widgets without
being in full power mode but the shutdown functionality assumes these
things. Add checks for the bias level at each stage so that we don't
do transitions other than the ON->PREPARE->STANDBY->OFF ones that the
drivers are expecting.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: stable@kernel.org

sound/soc/soc-dapm.c

@@ -3068,9 +3068,13 @@ static void soc_dapm_shutdown_codec(struct snd_soc_dapm_context *dapm)
 	 * standby.
 	 */
 	if (powerdown) {
-		snd_soc_dapm_set_bias_level(dapm, SND_SOC_BIAS_PREPARE);
+		if (dapm->bias_level == SND_SOC_BIAS_ON)
+			snd_soc_dapm_set_bias_level(dapm,
+						    SND_SOC_BIAS_PREPARE);
 		dapm_seq_run(dapm, &down_list, 0, false);
-		snd_soc_dapm_set_bias_level(dapm, SND_SOC_BIAS_STANDBY);
+		if (dapm->bias_level == SND_SOC_BIAS_PREPARE)
+			snd_soc_dapm_set_bias_level(dapm,
+						    SND_SOC_BIAS_STANDBY);
 	}
 }
 
@@ -3083,7 +3087,9 @@ void snd_soc_dapm_shutdown(struct snd_soc_card *card)
 
 	list_for_each_entry(codec, &card->codec_dev_list, list) {
 		soc_dapm_shutdown_codec(&codec->dapm);
-		snd_soc_dapm_set_bias_level(&codec->dapm, SND_SOC_BIAS_OFF);
+		if (codec->dapm.bias_level == SND_SOC_BIAS_STANDBY)
+			snd_soc_dapm_set_bias_level(&codec->dapm,
+						    SND_SOC_BIAS_OFF);
 	}
 }