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/rt1316-sdw.c | 40 +++++++++++++++++++++--------------
1 file changed, 24 insertions(+), 16 deletions(-)
diff --git a/sound/soc/codecs/rt1316-sdw.c b/sound/soc/codecs/rt1316-sdw.c
index 57abbe2de7cf..47511f70119a 100644
--- a/sound/soc/codecs/rt1316-sdw.c
+++ b/sound/soc/codecs/rt1316-sdw.c
@@ -277,20 +277,11 @@ static int rt1316_io_init(struct device *dev, struct sdw_slave *slave)
regcache_cache_bypass(rt1316->regmap, true);
} else {
/*
- * PM runtime is only enabled when a Slave reports as Attached
+ * PM runtime status is marked as 'active' only when a Slave reports as Attached
*/
- /* set autosuspend parameters */
- pm_runtime_set_autosuspend_delay(&slave->dev, 3000);
- pm_runtime_use_autosuspend(&slave->dev);
-
/* update count of parent 'active' children */
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);
@@ -607,6 +598,9 @@ static int rt1316_sdw_component_probe(struct snd_soc_component *component)
rt1316->component = component;
rt1316_sdw_parse_dt(rt1316, &rt1316->sdw_slave->dev);
+ if (!rt1316->first_hw_init)
+ return 0;
+
ret = pm_runtime_resume(component->dev);
if (ret < 0 && ret != -EACCES)
return ret;
@@ -687,10 +681,27 @@ static int rt1316_sdw_init(struct device *dev, struct regmap *regmap,
&soc_component_sdw_rt1316,
rt1316_sdw_dai,
ARRAY_SIZE(rt1316_sdw_dai));
+ if (ret < 0)
+ return ret;
- dev_dbg(&slave->dev, "%s\n", __func__);
+ /* set autosuspend parameters */
+ pm_runtime_set_autosuspend_delay(dev, 3000);
+ pm_runtime_use_autosuspend(dev);
- return ret;
+ /* 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(dev, "%s\n", __func__);
+
+ return 0;
}
static int rt1316_sdw_probe(struct sdw_slave *slave,
@@ -708,10 +719,7 @@ static int rt1316_sdw_probe(struct sdw_slave *slave,
static int rt1316_sdw_remove(struct sdw_slave *slave)
{
- struct rt1316_sdw_priv *rt1316 = dev_get_drvdata(&slave->dev);
-
- if (rt1316->first_hw_init)
- pm_runtime_disable(&slave->dev);
+ pm_runtime_disable(&slave->dev);
return 0;
}
--
2.39.2
