WSA SoundWire Controller does not support Clock stop and performs a soft reset
on suspend resume path. Its recommended that WSA881x codecs connected to this
are also reset using a hard reset during suspend resume.
So this codec driver performs a hard reset during suspend resume cycle.
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxx>
---
Changes since v3:
- added missing sign off.
- no code changes
sound/soc/codecs/wsa881x.c | 53 ++++++++++++++++++++++++++++++++++++++
1 file changed, 53 insertions(+)
diff --git a/sound/soc/codecs/wsa881x.c b/sound/soc/codecs/wsa881x.c
index 0222370ff95d..616b26c70c3b 100644
--- a/sound/soc/codecs/wsa881x.c
+++ b/sound/soc/codecs/wsa881x.c
@@ -11,6 +11,7 @@
#include <linux/of_gpio.h>
#include <linux/regmap.h>
#include <linux/slab.h>
+#include <linux/pm_runtime.h>
#include <linux/soundwire/sdw.h>
#include <linux/soundwire/sdw_registers.h>
#include <linux/soundwire/sdw_type.h>
@@ -198,6 +199,7 @@
#define WSA881X_OCP_CTL_TIMER_SEC 2
#define WSA881X_OCP_CTL_TEMP_CELSIUS 25
#define WSA881X_OCP_CTL_POLL_TIMER_SEC 60
+#define WSA881X_PROBE_TIMEOUT 1000
#define WSA881X_PA_GAIN_TLV(xname, reg, shift, max, invert, tlv_array) \
{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, \
@@ -747,6 +749,12 @@ static int wsa881x_put_pa_gain(struct snd_kcontrol *kc,
unsigned int mask = (1 << fls(max)) - 1;
int val, ret, min_gain, max_gain;
+ ret = pm_runtime_get_sync(comp->dev);
+ if (ret < 0 && ret != -EACCES) {
+ pm_runtime_put_noidle(comp->dev);
+ return ret;
+ }
+
max_gain = (max - ucontrol->value.integer.value[0]) & mask;
/*
* Gain has to set incrementally in 4 steps
@@ -773,6 +781,9 @@ static int wsa881x_put_pa_gain(struct snd_kcontrol *kc,
usleep_range(1000, 1010);
}
+ pm_runtime_mark_last_busy(comp->dev);
+ pm_runtime_put_autosuspend(comp->dev);
+
return 1;
}
@@ -1101,6 +1112,7 @@ static int wsa881x_probe(struct sdw_slave *pdev,
const struct sdw_device_id *id)
{
struct wsa881x_priv *wsa881x;
+ struct device *dev = &pdev->dev;
wsa881x = devm_kzalloc(&pdev->dev, sizeof(*wsa881x), GFP_KERNEL);
if (!wsa881x)
@@ -1132,12 +1144,52 @@ static int wsa881x_probe(struct sdw_slave *pdev,
return PTR_ERR(wsa881x->regmap);
}
+ pm_runtime_set_autosuspend_delay(dev, 3000);
+ pm_runtime_use_autosuspend(dev);
+ pm_runtime_mark_last_busy(dev);
+ pm_runtime_set_active(dev);
+ pm_runtime_enable(dev);
+
return devm_snd_soc_register_component(&pdev->dev,
&wsa881x_component_drv,
wsa881x_dais,
ARRAY_SIZE(wsa881x_dais));
}
+static int __maybe_unused wsa881x_runtime_suspend(struct device *dev)
+{
+ struct regmap *regmap = dev_get_regmap(dev, NULL);
+ struct wsa881x_priv *wsa881x = dev_get_drvdata(dev);
+
+ gpiod_direction_output(wsa881x->sd_n, 0);
+
+ regcache_cache_only(regmap, true);
+ regcache_mark_dirty(regmap);
+
+ return 0;
+}
+
+static int __maybe_unused wsa881x_runtime_resume(struct device *dev)
+{
+ struct sdw_slave *slave = dev_to_sdw_dev(dev);
+ struct regmap *regmap = dev_get_regmap(dev, NULL);
+ struct wsa881x_priv *wsa881x = dev_get_drvdata(dev);
+
+ gpiod_direction_output(wsa881x->sd_n, 1);
+
+ wait_for_completion_timeout(&slave->initialization_complete,
+ msecs_to_jiffies(WSA881X_PROBE_TIMEOUT));
+
+ regcache_cache_only(regmap, false);
+ regcache_sync(regmap);
+
+ return 0;
+}
+
+static const struct dev_pm_ops wsa881x_pm_ops = {
+ SET_RUNTIME_PM_OPS(wsa881x_runtime_suspend, wsa881x_runtime_resume, NULL)
+};
+
static const struct sdw_device_id wsa881x_slave_id[] = {
SDW_SLAVE_ENTRY(0x0217, 0x2010, 0),
SDW_SLAVE_ENTRY(0x0217, 0x2110, 0),
@@ -1151,6 +1203,7 @@ static struct sdw_driver wsa881x_codec_driver = {
.id_table = wsa881x_slave_id,
.driver = {
.name = "wsa881x-codec",
+ .pm = &wsa881x_pm_ops,
}
};
module_sdw_driver(wsa881x_codec_driver);
--
2.21.0
