ASoC: da7219: Make more efficient use of MCLK within driver
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>
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 @@
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 @@
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);