ASoC: Allow writes to uncached registers in WM8990

Only fully documented registers are cached in the WM8990 but additional
registers exist.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/sound/soc/codecs/wm8990.c b/sound/soc/codecs/wm8990.c
index 572d22b0880b..5c84f02c4579 100644
--- a/sound/soc/codecs/wm8990.c
+++ b/sound/soc/codecs/wm8990.c
@@ -106,6 +106,7 @@ static const u16 wm8990_reg[] = {
         0x0008,     /* R60 - PLL1 */
         0x0031,     /* R61 - PLL2 */
         0x0026,     /* R62 - PLL3 */
+        0x0000,     /* R63 - Driver internal */
 };
 
 /*
@@ -126,10 +127,9 @@ static inline void wm8990_write_reg_cache(struct snd_soc_codec *codec,
         unsigned int reg, unsigned int value)
 {
         u16 *cache = codec->reg_cache;
-        BUG_ON(reg > (ARRAY_SIZE(wm8990_reg)) - 1);
 
-        /* Reset register is uncached */
-        if (reg == 0)
+        /* Reset register and reserved registers are uncached */
+        if (reg == 0 || reg > ARRAY_SIZE(wm8990_reg) - 1)
                 return;
 
         cache[reg] = value;