From 667e9334fa64da2273e36ce131b05ac9e47c5769 Mon Sep 17 00:00:00 2001
From: b-ak <anur.bhargav@gmail.com>
Date: Mon, 7 Jan 2019 22:30:22 +0530
Subject: [PATCH] ASoC: tlv320aic32x4: Kernel OOPS while entering DAPM standby mode
Git-commit: 667e9334fa64da2273e36ce131b05ac9e47c5769
Patch-mainline: v5.0-rc4
References: bsc#1111666

[ backport note: replaced context component -> codec for 4.12 -- tiwai ]

During the bootup of the kernel, the DAPM bias level is in the OFF
state. As soon as the DAPM framework kicks in it pushes the codec
into STANDBY state.

The probe function doesn't prepare the clock, and STANDBY state
does a clk_disable_unprepare() without checking the previous state.
This leads to an OOPS.

Not transitioning from an OFF state to the STANDBY state fixes the
problem.

Signed-off-by: b-ak <anur.bhargav@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: stable@vger.kernel.org
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 sound/soc/codecs/tlv320aic32x4.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/sound/soc/codecs/tlv320aic32x4.c
+++ b/sound/soc/codecs/tlv320aic32x4.c
@@ -672,6 +672,10 @@ static int aic32x4_set_bias_level(struct
 	case SND_SOC_BIAS_PREPARE:
 		break;
 	case SND_SOC_BIAS_STANDBY:
+		/* Initial cold start */
+		if (snd_soc_codec_get_bias_level(codec) == SND_SOC_BIAS_OFF)
+			break;
+
 		/* Switch off BCLK_N Divider */
 		snd_soc_update_bits(codec, AIC32X4_BCLKN,
 				    AIC32X4_BCLKEN, 0);