ASoC: core: giving WARN when device starting from non-off bias with idle_bias_off

Just found some cases that some codec drivers set the bias to _STANDBY and
set idle_bias_off to 1 during probing.
It will cause unpaired runtime_get_sync/put() issue. Also as Mark suggested,
there is no reason to start from _STANDBY bias with idle_bias_off == 1.

So here giving one warning when detected (dapm.idle_bias_off == 1) and
(dapm.bias_level != SND_SOC_BIAS_OFF) just after driver->probe().

Signed-off-by: liu chuansheng <chuansheng.liu@intel.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index 91d592ff67b7..e0e8ce0c031a 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -1107,6 +1107,10 @@ static int soc_probe_codec(struct snd_soc_card *card,
                                 "ASoC: failed to probe CODEC %d\n", ret);
                         goto err_probe;
                 }
+                WARN(codec->dapm.idle_bias_off &&
+                        codec->dapm.bias_level != SND_SOC_BIAS_OFF,
+                        "codec %s can not start from non-off bias"
+                        " with idle_bias_off==1\n", codec->name);
         }
 
         /* If the driver didn't set I/O up try regmap */