[alsa-devel] [PATCH] ASoC: wm8994: Unsuspend the device while reading GPIO statuses

[Mark Brown]

Otherwise we might get an error if the GPIO is configured as an input
since that makes the register volatile and a suspended device can't be
read from.

Signed-off-by: Mark Brown <broonie at opensource.wolfsonmicro.com>
---
 sound/soc/codecs/wm8994.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/sound/soc/codecs/wm8994.c b/sound/soc/codecs/wm8994.c
index 1653000..a0eaf93 100644
--- a/sound/soc/codecs/wm8994.c
+++ b/sound/soc/codecs/wm8994.c
@@ -3554,6 +3554,9 @@ static int wm8994_codec_probe(struct snd_soc_codec *codec)
 			wm8994->fll_locked_irq = false;
 	}
 
+	/* Make sure we can read from the GPIOs if they're inputs */
+	pm_runtime_get_sync(codec->dev);
+
 	/* Remember if AIFnLRCLK is configured as a GPIO.  This should be
 	 * configured on init - if a system wants to do this dynamically
 	 * at runtime we can deal with that then.
@@ -3582,6 +3585,8 @@ static int wm8994_codec_probe(struct snd_soc_codec *codec)
 		wm8994->lrclk_shared[1] = 0;
 	}
 
+	pm_runtime_put(codec->dev);
+
 	/* Latch volume updates (right only; we always do left then right). */
 	snd_soc_update_bits(codec, WM8994_AIF1_DAC1_LEFT_VOLUME,
 			    WM8994_AIF1DAC1_VU, WM8994_AIF1DAC1_VU);
-- 
1.7.9.rc1