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ASoC: twl6040: Custom caching for sensitive DL1/2 path registers

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Introduce a small register cache for registers which needs special caching
to reduce pop noise:
TWL6040_REG_HSLCTL, TWL6040_REG_HSRCTL, TWL6040_REG_EARCTL, TWL6040_REG_HFLCTL
and TWL6040_REG_HFRCTL.
Switch over and use the new small cache for these registers instead of the
main reg_cache.
This is in preparation to remove the local ASoC reg_cache from the driver.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Peter Ujfalusi 2013-11-29 16:03:44 +02:00 committed by Mark Brown
parent 0d35d080ac
commit 53509108f7
1 changed files with 49 additions and 2 deletions
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51
sound/soc/codecs/twl6040.c
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@ -72,6 +72,7 @@ struct twl6040_data {
int hs_power_mode_locked;
bool dl1_unmuted;
bool dl2_unmuted;
u8 dl12_cache[TWL6040_REG_HFRCTL - TWL6040_REG_HSLCTL + 1];
unsigned int clk_in;
unsigned int sysclk;
struct twl6040_jack_data hs_jack;
@ -174,18 +175,62 @@ static struct snd_pcm_hw_constraint_list sysclk_constraints[] = {
{ .count = ARRAY_SIZE(hp_rates), .list = hp_rates, },
};
static inline int twl6040_read_dl12_cache(struct snd_soc_codec *codec,
u8 reg, u8 *value)
{
struct twl6040_data *priv = snd_soc_codec_get_drvdata(codec);
int ret = 0;
switch (reg) {
case TWL6040_REG_HSLCTL:
case TWL6040_REG_HSRCTL:
case TWL6040_REG_EARCTL:
case TWL6040_REG_HFLCTL:
case TWL6040_REG_HFRCTL:
*value = priv->dl12_cache[reg - TWL6040_REG_HSLCTL];
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
/*
* read twl6040 register cache
*/
static inline unsigned int twl6040_read_reg_cache(struct snd_soc_codec *codec,
unsigned int reg)
unsigned int reg)
{
u8 *cache = codec->reg_cache;
u8 value;
if (reg >= TWL6040_CACHEREGNUM)
return -EIO;
return cache[reg];
if (twl6040_read_dl12_cache(codec, reg, &value))
value = cache[reg];
return value;
}
static inline void twl6040_update_dl12_cache(struct snd_soc_codec *codec,
u8 reg, u8 value)
{
struct twl6040_data *priv = snd_soc_codec_get_drvdata(codec);
switch (reg) {
case TWL6040_REG_HSLCTL:
case TWL6040_REG_HSRCTL:
case TWL6040_REG_EARCTL:
case TWL6040_REG_HFLCTL:
case TWL6040_REG_HFRCTL:
priv->dl12_cache[reg - TWL6040_REG_HSLCTL] = value;
break;
default:
break;
}
}
/*
@ -199,6 +244,8 @@ static inline void twl6040_write_reg_cache(struct snd_soc_codec *codec,
if (reg >= TWL6040_CACHEREGNUM)
return;
cache[reg] = value;
twl6040_update_dl12_cache(codec, reg, value);
}
/*