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.opensou...@diasemi.com>
---
sound/soc/codecs/da7219-aad.c | 18 +++++++++++++++++-
sound/soc/codecs/da7219.c | 18 +++++++++++-------
2 files changed, 28 insertions(+), 8 deletions(-)
diff --git a/sound/soc/codecs/da7219-aad.c b/sound/soc/codecs/da7219-aad.c
index f0057cd..4e369a1 100644
--- a/sound/soc/codecs/da7219-aad.c
+++ b/sound/soc/codecs/da7219-aad.c
@@ -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);
diff --git a/sound/soc/codecs/da7219.c b/sound/soc/codecs/da7219.c
index 50ea943..737e914 100644
--- a/sound/soc/codecs/da7219.c
+++ b/sound/soc/codecs/da7219.c
@@ -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;
}
--
1.9.3
