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ASoC: Do not write to invalid registers on the wm9712. 

This patch fixes a bug where "virtual" registers were being written to the ac97
bus.  This was causing unrelated registers to become corrupted (headphone 0x04,
touchscreen 0x78, etc).

This patch duplicates protection that was included in the wm9713 driver.

Signed-off-by: Eric Millbrandt <emillbrandt@dekaresearch.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: stable@kernel.org
This commit is contained in:
Eric Millbrandt 2009-12-22 10:13:24 -05:00 committed by Mark Brown
parent 1628af5adf
commit 48e3cbb3f6
1 changed files with 2 additions and 1 deletions
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3
sound/soc/codecs/wm9712.c
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@ -463,7 +463,8 @@ static int ac97_write(struct snd_soc_codec *codec, unsigned int reg,
{
u16 *cache = codec->reg_cache;
soc_ac97_ops.write(codec->ac97, reg, val);
if (reg < 0x7c)
soc_ac97_ops.write(codec->ac97, reg, val);
reg = reg >> 1;
if (reg < (ARRAY_SIZE(wm9712_reg)))
cache[reg] = val;