1 files changed, 22 insertions, 0 deletions

diff --git a/sound/soc/codecs/wm8903.c b/sound/soc/codecs/wm8903.c
index c7b52a04fe1a..f656a000b369 100644
--- a/sound/soc/codecs/wm8903.c
+++ b/sound/soc/codecs/wm8903.c
@@ -1917,12 +1917,26 @@ static int wm8903_probe(struct snd_soc_codec *codec)
 
         /* Set up GPIOs and microphone detection */
         if (pdata) {
+                bool mic_gpio = false;
+
                 for (i = 0; i < ARRAY_SIZE(pdata->gpio_cfg); i++) {
                         if (pdata->gpio_cfg[i] == WM8903_GPIO_NO_CONFIG)
                                 continue;
 
                         snd_soc_write(codec, WM8903_GPIO_CONTROL_1 + i,
                                       pdata->gpio_cfg[i] & 0xffff);
+
+                        val = (pdata->gpio_cfg[i] & WM8903_GP1_FN_MASK)
+                                >> WM8903_GP1_FN_SHIFT;
+
+                        switch (val) {
+                        case WM8903_GPn_FN_MICBIAS_CURRENT_DETECT:
+                        case WM8903_GPn_FN_MICBIAS_SHORT_DETECT:
+                                mic_gpio = true;
+                                break;
+                        default:
+                                break;
+                        }
                 }
 
                 snd_soc_write(codec, WM8903_MIC_BIAS_CONTROL_0,
@@ -1933,6 +1947,14 @@ static int wm8903_probe(struct snd_soc_codec *codec)
                         snd_soc_update_bits(codec, WM8903_WRITE_SEQUENCER_0,
                                             WM8903_WSEQ_ENA, WM8903_WSEQ_ENA);
 
+                /* If microphone detection is enabled by pdata but
+                 * detected via IRQ then interrupts can be lost before
+                 * the machine driver has set up microphone detection
+                 * IRQs as the IRQs are clear on read.  The detection
+                 * will be enabled when the machine driver configures.
+                 */
+                WARN_ON(!mic_gpio && (pdata->micdet_cfg & WM8903_MICDET_ENA));
+
                 wm8903->mic_delay = pdata->micdet_delay;
         }