In kabylake_set_bias_level(), enabling mclk may fail if the clock has
already been enabled by the firmware. Attempts to disable that clock
later will fail with a warning backtrace.
mclk already disabled
WARNING: CPU: 2 PID: 108 at drivers/clk/clk.c:952 clk_core_disable+0x1b6/0x1cf
...
Call Trace:
clk_disable+0x2d/0x3a
kabylake_set_bias_level+0x72/0xfd [snd_soc_kbl_rt5663_rt5514_max98927]
snd_soc_card_set_bias_level+0x2b/0x6f
snd_soc_dapm_set_bias_level+0xe1/0x209
dapm_pre_sequence_async+0x63/0x96
async_run_entry_fn+0x3d/0xd1
process_one_work+0x2a9/0x526
...
Only disable the clock if it has been enabled.
Fixes: 15747a802075 ("ASoC: eve: implement set_bias_level function for rt5514")
Cc: Brent Lu <brent.lu@xxxxxxxxx>
Cc: Curtis Malainey <cujomalainey@xxxxxxxxxxxx>
Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
---
sound/soc/intel/boards/kbl_rt5663_rt5514_max98927.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/sound/soc/intel/boards/kbl_rt5663_rt5514_max98927.c b/sound/soc/intel/boards/kbl_rt5663_rt5514_max98927.c
index 922cd0176e1f..f95546c184aa 100644
--- a/sound/soc/intel/boards/kbl_rt5663_rt5514_max98927.c
+++ b/sound/soc/intel/boards/kbl_rt5663_rt5514_max98927.c
@@ -700,6 +700,8 @@ static int kabylake_set_bias_level(struct snd_soc_card *card,
switch (level) {
case SND_SOC_BIAS_PREPARE:
if (dapm->bias_level == SND_SOC_BIAS_ON) {
+ if (!__clk_is_enabled(priv->mclk))
+ return 0;
dev_dbg(card->dev, "Disable mclk");
clk_disable_unprepare(priv->mclk);
} else {
--
2.17.1
