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authorMark Brown <broonie@opensource.wolfsonmicro.com>2011-08-19 18:05:05 +0900
committerMark Brown <broonie@opensource.wolfsonmicro.com>2011-11-04 23:24:59 +0000
commit19940b3d55c87d8089a8cb0fa8e5a9918a3846bd (patch)
treecae1abaac5efabe83003f4352d068bd7034ae6ae /sound
parent5a3ad6bd6ae0687cb0ecb424d74221920fbc7f38 (diff)
downloadop-kernel-dev-19940b3d55c87d8089a8cb0fa8e5a9918a3846bd.zip
op-kernel-dev-19940b3d55c87d8089a8cb0fa8e5a9918a3846bd.tar.gz
ASoC: Ensure we get an impedence reported for WM8958 jack detect
Occasionally we may see an accessory reported before we have a stable impedance for the accessory. If this happens then reread the status in order to ensure that the handler can take the appropriate action for the status change. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'sound')
-rw-r--r--sound/soc/codecs/wm8994.c37
1 files changed, 26 insertions, 11 deletions
diff --git a/sound/soc/codecs/wm8994.c b/sound/soc/codecs/wm8994.c
index 9cb16cc..9c982e4 100644
--- a/sound/soc/codecs/wm8994.c
+++ b/sound/soc/codecs/wm8994.c
@@ -3030,19 +3030,34 @@ static irqreturn_t wm8958_mic_irq(int irq, void *data)
{
struct wm8994_priv *wm8994 = data;
struct snd_soc_codec *codec = wm8994->codec;
- int reg;
+ int reg, count;
- reg = snd_soc_read(codec, WM8958_MIC_DETECT_3);
- if (reg < 0) {
- dev_err(codec->dev, "Failed to read mic detect status: %d\n",
- reg);
- return IRQ_NONE;
- }
+ /* We may occasionally read a detection without an impedence
+ * range being provided - if that happens loop again.
+ */
+ count = 10;
+ do {
+ reg = snd_soc_read(codec, WM8958_MIC_DETECT_3);
+ if (reg < 0) {
+ dev_err(codec->dev,
+ "Failed to read mic detect status: %d\n",
+ reg);
+ return IRQ_NONE;
+ }
- if (!(reg & WM8958_MICD_VALID)) {
- dev_dbg(codec->dev, "Mic detect data not valid\n");
- goto out;
- }
+ if (!(reg & WM8958_MICD_VALID)) {
+ dev_dbg(codec->dev, "Mic detect data not valid\n");
+ goto out;
+ }
+
+ if (!(reg & WM8958_MICD_STS) || (reg & WM8958_MICD_LVL_MASK))
+ break;
+
+ msleep(1);
+ } while (count--);
+
+ if (count == 0)
+ dev_warn(codec->dev, "No impedence range reported for jack\n");
#ifndef CONFIG_SND_SOC_WM8994_MODULE
trace_snd_soc_jack_irq(dev_name(codec->dev));
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