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ASoC: da7219: Make more efficient use of MCLK within driver

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Currently, if the driver has control of MCLK then it remains
enabled as long as the codec is in STANDBY or above. The MCLK is
only really required in STANDBY when a 3-pole jack is inserted
and the HP detect procedure is required to run.

This patch updates the code to enable/disable the MCLK when moving
between the STANDBY and PREPARE bias level, and when a 3-pole jack
is inserted and HP detection is required, thus saving power at all
other times.

Signed-off-by: Adam Thomson <Adam.Thomson.Opensource@diasemi.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Adam Thomson 2016-07-29 14:46:54 +01:00 committed by Mark Brown
parent 29b4817d40
commit 40585391fc
2 changed files with 28 additions and 8 deletions
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18
sound/soc/codecs/da7219-aad.c
View File

@ -13,6 +13,7 @@
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/i2c.h>
#include <linux/property.h>
#include <linux/pm_wakeirq.h>
@ -115,12 +116,23 @@ static void da7219_aad_hptest_work(struct work_struct *work)
u16 tonegen_freq_hptest;
u8 accdet_cfg8;
int report = 0;
int report = 0, ret = 0;
/* Lock DAPM and any Kcontrols that are affected by this test */
snd_soc_dapm_mutex_lock(dapm);
mutex_lock(&da7219->lock);
/* Ensure MCLK is available for HP test procedure */
if (da7219->mclk) {
ret = clk_prepare_enable(da7219->mclk);
if (ret) {
dev_err(codec->dev, "Failed to enable mclk - %d\n", ret);
mutex_unlock(&da7219->lock);
snd_soc_dapm_mutex_unlock(dapm);
return;
}
}
/* Bypass cache so it saves current settings */
regcache_cache_bypass(da7219->regmap, true);
@ -250,6 +262,10 @@ static void da7219_aad_hptest_work(struct work_struct *work)
snd_soc_update_bits(codec, DA7219_HP_R_CTRL, DA7219_HP_R_AMP_OE_MASK,
DA7219_HP_R_AMP_OE_MASK);
/* Remove MCLK, if previously enabled */
if (da7219->mclk)
clk_disable_unprepare(da7219->mclk);
mutex_unlock(&da7219->lock);
snd_soc_dapm_mutex_unlock(dapm);

18
sound/soc/codecs/da7219.c
View File

@ -1508,11 +1508,10 @@ static int da7219_set_bias_level(struct snd_soc_codec *codec,
switch (level) {
case SND_SOC_BIAS_ON:
case SND_SOC_BIAS_PREPARE:
break;
case SND_SOC_BIAS_STANDBY:
if (snd_soc_codec_get_bias_level(codec) == SND_SOC_BIAS_OFF) {
/* MCLK */
case SND_SOC_BIAS_PREPARE:
/* Enable MCLK for transition to ON state */
if (snd_soc_codec_get_bias_level(codec) == SND_SOC_BIAS_STANDBY) {
if (da7219->mclk) {
ret = clk_prepare_enable(da7219->mclk);
if (ret) {
@ -1521,11 +1520,19 @@ static int da7219_set_bias_level(struct snd_soc_codec *codec,
return ret;
}
}
}
break;
case SND_SOC_BIAS_STANDBY:
if (snd_soc_codec_get_bias_level(codec) == SND_SOC_BIAS_OFF) {
/* Master bias */
snd_soc_update_bits(codec, DA7219_REFERENCES,
DA7219_BIAS_EN_MASK,
DA7219_BIAS_EN_MASK);
} else {
/* Remove MCLK */
if (da7219->mclk)
clk_disable_unprepare(da7219->mclk);
}
break;
case SND_SOC_BIAS_OFF:
@ -1534,9 +1541,6 @@ static int da7219_set_bias_level(struct snd_soc_codec *codec,
snd_soc_update_bits(codec, DA7219_REFERENCES,
DA7219_BIAS_EN_MASK, 0);
/* MCLK */
if (da7219->mclk)
clk_disable_unprepare(da7219->mclk);
break;
}