From 879ee8b6f2bae0cc4a25536f8841db1dbc969523 Mon Sep 17 00:00:00 2001
From: Guenter Roeck <linux@roeck-us.net>
Date: Wed, 11 Nov 2020 12:54:34 -0800
Subject: [PATCH] ASOC: Intel: kbl_rt5663_rt5514_max98927: Do not try to disable disabled clock
Git-commit: 879ee8b6f2bae0cc4a25536f8841db1dbc969523
Patch-mainline: v5.10-rc5
References: git-fixes

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@intel.com>
Cc: Curtis Malainey <cujomalainey@chromium.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20201111205434.207610-1-linux@roeck-us.net
Signed-off-by: Mark Brown <broonie@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 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 {
-- 
2.16.4