ASoC: soc-cache: let reg be AND'ed by 0xff instead of data buffer for 8_8 mode

The registers for AD193X are defined as 0x800-0x810 for spi which uses
16_8 mode, for i2c to support AD1937, we will use 8_8 mode, only the low
byte of 0x800-0x810 is valid.  The patch will not destory other codecs,
but make soc cache interface more useful.

Signed-off-by: Barry Song <barry.song@analog.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/sound/soc/soc-cache.c b/sound/soc/soc-cache.c
index 91db7afb1210..9dfe9a58a314 100644
--- a/sound/soc/soc-cache.c
+++ b/sound/soc/soc-cache.c
@@ -159,7 +159,8 @@ static int snd_soc_8_8_write(struct snd_soc_codec *codec, unsigned int reg,
 
         BUG_ON(codec->volatile_register);
 
-        data[0] = reg & 0xff;
+        reg &= 0xff;
+        data[0] = reg;
         data[1] = value & 0xff;
 
         if (reg < codec->reg_cache_size)
@@ -180,6 +181,7 @@ static unsigned int snd_soc_8_8_read(struct snd_soc_codec *codec,
                                      unsigned int reg)
 {
         u8 *cache = codec->reg_cache;
+        reg &= 0xff;
         if (reg >= codec->reg_cache_size)
                 return -1;
         return cache[reg];