ASoC: tlv320aic32x4: Kernel OOPS while entering DAPM standby mode

commit 667e9334fa64da2273e36ce131b05ac9e47c5769 upstream.

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
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/sound/soc/codecs/tlv320aic32x4.c b/sound/soc/codecs/tlv320aic32x4.c
index e2b5a11..f03195d 100644 (file)
--- a/sound/soc/codecs/tlv320aic32x4.c
+++ b/sound/soc/codecs/tlv320aic32x4.c
@@ -822,6 +822,10 @@ static int aic32x4_set_bias_level(struct snd_soc_component *component,
        case SND_SOC_BIAS_PREPARE:
                break;
        case SND_SOC_BIAS_STANDBY:
+               /* Initial cold start */
+               if (snd_soc_component_get_bias_level(component) == SND_SOC_BIAS_OFF)
+                       break;
+
                /* Switch off BCLK_N Divider */
                snd_soc_component_update_bits(component, AIC32X4_BCLKN,
                                    AIC32X4_BCLKEN, 0);