[PATCH] ASoC: tpa6130a2: fix volume setting when no stream is running

From: Nikita Yushchenko
Date: Thu Sep 22 2016 - 06:11:14 EST


After moving tpa6130a2 power management to DAPM, if chip can be physically
powered off (either reset_gpio is defined, or regulator indeed removes
power), then volume change no longer works unless chip is on due to
a running stream.

Fix that by entering regcache cache_only mode while chip is off.

Move regcache calls to tpa6130a2_power() to get them at driver init time
as well.

Signed-off-by: Nikita Yushchenko <nikita.yoush@xxxxxxxxxxxxxxxxxx>
---
sound/soc/codecs/tpa6130a2.c | 49 +++++++++++++++++++++++---------------------
1 file changed, 26 insertions(+), 23 deletions(-)

diff --git a/sound/soc/codecs/tpa6130a2.c b/sound/soc/codecs/tpa6130a2.c
index f1ea052..3b6faed 100644
--- a/sound/soc/codecs/tpa6130a2.c
+++ b/sound/soc/codecs/tpa6130a2.c
@@ -52,7 +52,7 @@ struct tpa6130a2_data {

static int tpa6130a2_power(struct tpa6130a2_data *data, bool enable)
{
- int ret;
+ int ret = 0, ret2;

if (enable) {
ret = regulator_enable(data->supply);
@@ -64,20 +64,34 @@ static int tpa6130a2_power(struct tpa6130a2_data *data, bool enable)
/* Power on */
if (data->power_gpio >= 0)
gpio_set_value(data->power_gpio, 1);
+
+ /* Sync registers */
+ regcache_cache_only(data->regmap, false);
+ ret = regcache_sync(data->regmap);
+ if (ret != 0) {
+ dev_err(data->dev,
+ "Failed to sync registers: %d\n", ret);
+ goto regcache_sync_failed;
+ }
} else {
+ /* Powered off device does not retain registers. While device
+ * is off, any register updates (i.e. volume changes) should
+ * happen in cache only.
+ */
+ regcache_mark_dirty(data->regmap);
+regcache_sync_failed:
+ regcache_cache_only(data->regmap, true);
+
/* Power off */
if (data->power_gpio >= 0)
gpio_set_value(data->power_gpio, 0);

- ret = regulator_disable(data->supply);
- if (ret != 0) {
+ ret2 = regulator_disable(data->supply);
+ if (ret2 != 0) {
dev_err(data->dev,
- "Failed to disable supply: %d\n", ret);
- return ret;
+ "Failed to disable supply: %d\n", ret2);
+ return ret ? ret : ret2;
}
-
- /* device regs does not match the cache state anymore */
- regcache_mark_dirty(data->regmap);
}

return ret;
@@ -88,25 +102,14 @@ static int tpa6130a2_power_event(struct snd_soc_dapm_widget *w,
{
struct snd_soc_component *c = snd_soc_dapm_to_component(w->dapm);
struct tpa6130a2_data *data = snd_soc_component_get_drvdata(c);
- int ret;

- /* before widget power up */
if (SND_SOC_DAPM_EVENT_ON(event)) {
- /* Turn on the chip */
- tpa6130a2_power(data, true);
- /* Sync the registers */
- ret = regcache_sync(data->regmap);
- if (ret < 0) {
- dev_err(c->dev, "Failed to initialize chip\n");
- tpa6130a2_power(data, false);
- return ret;
- }
- /* after widget power down */
+ /* Before widget power up: turn chip on, sync registers */
+ return tpa6130a2_power(data, true);
} else {
- tpa6130a2_power(data, false);
+ /* After widget power down: turn chip off */
+ return tpa6130a2_power(data, false);
}
-
- return 0;
}

/*
--
2.1.4