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ASoC: tlv320aic3x: Use regulator notifiers for optimizing the cache sync

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There is no need to reset the codec and perform cache sync if none of the
supply regulators were not disabled. Patch registers a notifier callback for
each supply and callback then sets a flag to indicate when cache sync is
required.

HW writes are also needless when codec bias is off so cache_only flag is set
independently of actual supply regulators state.

Signed-off-by: Jarkko Nikula <jhnikula@gmail.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
This commit is contained in:
Jarkko Nikula 2010-09-20 10:39:13 +03:00 committed by Liam Girdwood
parent 6c1a7d40c2
commit 5a895f8a09
1 changed files with 61 additions and 2 deletions
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63
sound/soc/codecs/tlv320aic3x.c
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@ -61,9 +61,18 @@ static const char *aic3x_supply_names[AIC3X_NUM_SUPPLIES] = {
"DRVDD", /* ADC Analog and Output Driver Voltage */
};
struct aic3x_priv;
struct aic3x_disable_nb {
struct notifier_block nb;
struct aic3x_priv *aic3x;
};
/* codec private data */
struct aic3x_priv {
struct snd_soc_codec *codec;
struct regulator_bulk_data supplies[AIC3X_NUM_SUPPLIES];
struct aic3x_disable_nb disable_nb[AIC3X_NUM_SUPPLIES];
enum snd_soc_control_type control_type;
struct aic3x_setup_data *setup;
void *control_data;
@ -122,6 +131,8 @@ static int aic3x_read(struct snd_soc_codec *codec, unsigned int reg,
{
u8 *cache = codec->reg_cache;
if (codec->cache_only)
return -EINVAL;
if (reg >= AIC3X_CACHEREGNUM)
return -1;
@ -1052,6 +1063,26 @@ static int aic3x_init_3007(struct snd_soc_codec *codec)
return 0;
}
static int aic3x_regulator_event(struct notifier_block *nb,
unsigned long event, void *data)
{
struct aic3x_disable_nb *disable_nb =
container_of(nb, struct aic3x_disable_nb, nb);
struct aic3x_priv *aic3x = disable_nb->aic3x;
if (event & REGULATOR_EVENT_DISABLE) {
/*
* Put codec to reset and require cache sync as at least one
* of the supplies was disabled
*/
if (aic3x->gpio_reset >= 0)
gpio_set_value(aic3x->gpio_reset, 0);
aic3x->codec->cache_sync = 1;
}
return 0;
}
static int aic3x_set_power(struct snd_soc_codec *codec, int power)
{
struct aic3x_priv *aic3x = snd_soc_codec_get_drvdata(codec);
@ -1064,6 +1095,13 @@ static int aic3x_set_power(struct snd_soc_codec *codec, int power)
if (ret)
goto out;
aic3x->power = 1;
/*
* Reset release and cache sync is necessary only if some
* supply was off or if there were cached writes
*/
if (!codec->cache_sync)
goto out;
if (aic3x->gpio_reset >= 0) {
udelay(1);
gpio_set_value(aic3x->gpio_reset, 1);
@ -1078,8 +1116,8 @@ static int aic3x_set_power(struct snd_soc_codec *codec, int power)
codec->cache_sync = 0;
} else {
aic3x->power = 0;
if (aic3x->gpio_reset >= 0)
gpio_set_value(aic3x->gpio_reset, 0);
/* HW writes are needless when bias is off */
codec->cache_only = 1;
ret = regulator_bulk_disable(ARRAY_SIZE(aic3x->supplies),
aic3x->supplies);
}
@ -1315,6 +1353,7 @@ static int aic3x_probe(struct snd_soc_codec *codec)
int ret, i;
codec->control_data = aic3x->control_data;
aic3x->codec = codec;
ret = snd_soc_codec_set_cache_io(codec, 8, 8, aic3x->control_type);
if (ret != 0) {
@ -1338,6 +1377,18 @@ static int aic3x_probe(struct snd_soc_codec *codec)
dev_err(codec->dev, "Failed to request supplies: %d\n", ret);
goto err_get;
}
for (i = 0; i < ARRAY_SIZE(aic3x->supplies); i++) {
aic3x->disable_nb[i].nb.notifier_call = aic3x_regulator_event;
aic3x->disable_nb[i].aic3x = aic3x;
ret = regulator_register_notifier(aic3x->supplies[i].consumer,
&aic3x->disable_nb[i].nb);
if (ret) {
dev_err(codec->dev,
"Failed to request regulator notifier: %d\n",
ret);
goto err_notif;
}
}
ret = regulator_bulk_enable(ARRAY_SIZE(aic3x->supplies),
aic3x->supplies);
@ -1372,6 +1423,10 @@ static int aic3x_probe(struct snd_soc_codec *codec)
return 0;
err_enable:
err_notif:
while (i--)
regulator_unregister_notifier(aic3x->supplies[i].consumer,
&aic3x->disable_nb[i].nb);
regulator_bulk_free(ARRAY_SIZE(aic3x->supplies), aic3x->supplies);
err_get:
if (aic3x->gpio_reset >= 0)
@ -1384,6 +1439,7 @@ err_gpio:
static int aic3x_remove(struct snd_soc_codec *codec)
{
struct aic3x_priv *aic3x = snd_soc_codec_get_drvdata(codec);
int i;
aic3x_set_bias_level(codec, SND_SOC_BIAS_OFF);
if (aic3x->gpio_reset >= 0) {
@ -1391,6 +1447,9 @@ static int aic3x_remove(struct snd_soc_codec *codec)
gpio_free(aic3x->gpio_reset);
}
regulator_bulk_disable(ARRAY_SIZE(aic3x->supplies), aic3x->supplies);
for (i = 0; i < ARRAY_SIZE(aic3x->supplies); i++)
regulator_unregister_notifier(aic3x->supplies[i].consumer,
&aic3x->disable_nb[i].nb);
regulator_bulk_free(ARRAY_SIZE(aic3x->supplies), aic3x->supplies);
return 0;