ASoC: Enable WM8990 ADC clocking workaround

Enable a hardware workaround which avoids problems with the clocking of
the ADCs in certain configurations.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/codecs/wm8990.c

@@ -1272,9 +1272,11 @@ static int wm8990_set_bias_level(struct snd_soc_codec *codec,
 
 			/* disable POBCTRL, SOFT_ST and BUFDCOPEN */
 			wm8990_write(codec, WM8990_ANTIPOP2, WM8990_BUFIOEN);
-		} else {
-			/* ON -> standby */
 
+			/* Enable workaround for ADC clocking issue. */
+			wm8990_write(codec, WM8990_EXT_ACCESS_ENA, 0x2);
+			wm8990_write(codec, WM8990_EXT_CTL1, 0xa003);
+			wm8990_write(codec, WM8990_EXT_ACCESS_ENA, 0);
 		}
 		break;
 

sound/soc/codecs/wm8990.h

@@ -80,8 +80,8 @@
 #define WM8990_PLL3                             0x3E
 #define WM8990_INTDRIVBITS			0x3F
 
-#define WM8990_REGISTER_COUNT                   60
-#define WM8990_MAX_REGISTER                     0x3F
+#define WM8990_EXT_ACCESS_ENA			0x75
+#define WM8990_EXT_CTL1				0x7a
 
 /*
  * Field Definitions.