This patch suggests enabling pm_runtime during the probe, but marking the
device as 'active' only after it is enumerated. That will force a
dependency between the card and the codec, pm_runtime_get_sync() will
have to wait for the codec device to resume and hence implicitly wait
for the enumeration/initialization to be completed. In the nominal
case where the codec device is already active the get_sync() would
only perform a ref-count increase.
The changes are directly inspired by RT711 and RT711-sdca changes.
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@xxxxxxxxxxxxxxx>
Reviewed-by: Rander Wang <rander.wang@xxxxxxxxx>
Reviewed-by: Bard Liao <yung-chuan.liao@xxxxxxxxxxxxxxx>
---
sound/soc/codecs/rt700-sdw.c | 3 +--
sound/soc/codecs/rt700.c | 39 ++++++++++++++++++++++++------------
2 files changed, 27 insertions(+), 15 deletions(-)
diff --git a/sound/soc/codecs/rt700-sdw.c b/sound/soc/codecs/rt700-sdw.c
index 53e7973e0bf9..52c33d56b143 100644
--- a/sound/soc/codecs/rt700-sdw.c
+++ b/sound/soc/codecs/rt700-sdw.c
@@ -464,8 +464,7 @@ static int rt700_sdw_remove(struct sdw_slave *slave)
cancel_delayed_work_sync(&rt700->jack_btn_check_work);
}
- if (rt700->first_hw_init)
- pm_runtime_disable(&slave->dev);
+ pm_runtime_disable(&slave->dev);
return 0;
}
diff --git a/sound/soc/codecs/rt700.c b/sound/soc/codecs/rt700.c
index b774349dfdae..0ebf344a1b60 100644
--- a/sound/soc/codecs/rt700.c
+++ b/sound/soc/codecs/rt700.c
@@ -320,6 +320,10 @@ static int rt700_set_jack_detect(struct snd_soc_component *component,
rt700->hs_jack = hs_jack;
+ /* we can only resume if the device was initialized at least once */
+ if (!rt700->first_hw_init)
+ return 0;
+
ret = pm_runtime_resume_and_get(component->dev);
if (ret < 0) {
if (ret != -EACCES) {
@@ -823,6 +827,9 @@ static int rt700_probe(struct snd_soc_component *component)
rt700->component = component;
+ if (!rt700->first_hw_init)
+ return 0;
+
ret = pm_runtime_resume(component->dev);
if (ret < 0 && ret != -EACCES)
return ret;
@@ -1119,10 +1126,26 @@ int rt700_init(struct device *dev, struct regmap *sdw_regmap,
&soc_codec_dev_rt700,
rt700_dai,
ARRAY_SIZE(rt700_dai));
+ if (ret < 0)
+ return ret;
+ /* set autosuspend parameters */
+ pm_runtime_set_autosuspend_delay(dev, 3000);
+ pm_runtime_use_autosuspend(dev);
+
+ /* make sure the device does not suspend immediately */
+ pm_runtime_mark_last_busy(dev);
+
+ pm_runtime_enable(dev);
+
+ /* important note: the device is NOT tagged as 'active' and will remain
+ * 'suspended' until the hardware is enumerated/initialized. This is required
+ * to make sure the ASoC framework use of pm_runtime_get_sync() does not silently
+ * fail with -EACCESS because of race conditions between card creation and enumeration
+ */
dev_dbg(&slave->dev, "%s\n", __func__);
- return ret;
+ return 0;
}
int rt700_io_init(struct device *dev, struct sdw_slave *slave)
@@ -1141,20 +1164,10 @@ int rt700_io_init(struct device *dev, struct sdw_slave *slave)
/*
* PM runtime is only enabled when a Slave reports as Attached
*/
- if (!rt700->first_hw_init) {
- /* set autosuspend parameters */
- pm_runtime_set_autosuspend_delay(&slave->dev, 3000);
- pm_runtime_use_autosuspend(&slave->dev);
-
- /* update count of parent 'active' children */
+ if (!rt700->first_hw_init)
+ /* PM runtime status is marked as 'active' only when a Slave reports as Attached */
pm_runtime_set_active(&slave->dev);
- /* make sure the device does not suspend immediately */
- pm_runtime_mark_last_busy(&slave->dev);
-
- pm_runtime_enable(&slave->dev);
- }
-
pm_runtime_get_noresume(&slave->dev);
/* reset */
--
2.39.2
