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ASoC: Ensure we get an impedence reported for WM8958 jack detect

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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>
This commit is contained in:
Mark Brown 2011-08-19 18:05:05 +09:00
parent 5a3ad6bd6a
commit 19940b3d55
2 changed files with 41 additions and 11 deletions
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15
include/linux/mfd/wm8994/registers.h
View File

@ -1962,6 +1962,21 @@
#define WM8958_MICB2_DISCH_SHIFT 0 /* MICB2_DISCH */
#define WM8958_MICB2_DISCH_WIDTH 1 /* MICB2_DISCH */
/*
* R210 (0xD2) - Mic Detect 3
*/
#define WM8958_MICD_LVL_MASK 0x07FC /* MICD_LVL - [10:2] */
#define WM8958_MICD_LVL_SHIFT 2 /* MICD_LVL - [10:2] */
#define WM8958_MICD_LVL_WIDTH 9 /* MICD_LVL - [10:2] */
#define WM8958_MICD_VALID 0x0002 /* MICD_VALID */
#define WM8958_MICD_VALID_MASK 0x0002 /* MICD_VALID */
#define WM8958_MICD_VALID_SHIFT 1 /* MICD_VALID */
#define WM8958_MICD_VALID_WIDTH 1 /* MICD_VALID */
#define WM8958_MICD_STS 0x0001 /* MICD_STS */
#define WM8958_MICD_STS_MASK 0x0001 /* MICD_STS */
#define WM8958_MICD_STS_SHIFT 0 /* MICD_STS */
#define WM8958_MICD_STS_WIDTH 1 /* MICD_STS */
/*
* R76 (0x4C) - Charge Pump (1)
*/

37
sound/soc/codecs/wm8994.c
View File

@ -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));