ASoC: Use a lower detection rate when monitoring headphones on WM8915

We only need to increase the detection rate to maximum if we're monitoring
for button presses as the response times needed for user interaction there
are much lower.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@ti.com>

sound/soc/codecs/wm8915.c

@@ -2288,6 +2288,12 @@ static void wm8915_micd(struct snd_soc_codec *codec)
 				    SND_JACK_HEADSET | SND_JACK_BTN_0);
 		wm8915->jack_mic = true;
 		wm8915->detecting = false;
+
+		/* Increase poll rate to give better responsiveness
+		 * for buttons */
+		snd_soc_update_bits(codec, WM8915_MIC_DETECT_1,
+				    WM8915_MICD_RATE_MASK,
+				    5 << WM8915_MICD_RATE_SHIFT);
 	}
 
 	/* If we detected a lower impedence during initial startup
@@ -2328,15 +2334,17 @@ static void wm8915_micd(struct snd_soc_codec *codec)
 					    SND_JACK_HEADPHONE,
 					    SND_JACK_HEADSET |
 					    SND_JACK_BTN_0);
+
+			/* Increase the detection rate a bit for
+			 * responsiveness.
+			 */
+			snd_soc_update_bits(codec, WM8915_MIC_DETECT_1,
+					    WM8915_MICD_RATE_MASK,
+					    7 << WM8915_MICD_RATE_SHIFT);
+
 			wm8915->detecting = false;
 		}
 	}
-
-	/* Increase poll rate to give better responsiveness for buttons */
-	if (!wm8915->detecting)
-		snd_soc_update_bits(codec, WM8915_MIC_DETECT_1,
-				    WM8915_MICD_RATE_MASK,
-				    5 << WM8915_MICD_RATE_SHIFT);
 }
 
 static irqreturn_t wm8915_irq(int irq, void *data)