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@linux.intel.com Reviewed-by: Ranjani Sridharan ranjani.sridharan@linux.intel.com Reviewed-by: Rander Wang rander.wang@intel.com Reviewed-by: Bard Liao yung-chuan.liao@linux.intel.com --- sound/soc/codecs/rt1308-sdw.c | 43 ++++++++++++++++++++--------------- 1 file changed, 25 insertions(+), 18 deletions(-)
diff --git a/sound/soc/codecs/rt1308-sdw.c b/sound/soc/codecs/rt1308-sdw.c index 2c4e5330c2df..c98cd7abef6a 100644 --- a/sound/soc/codecs/rt1308-sdw.c +++ b/sound/soc/codecs/rt1308-sdw.c @@ -223,22 +223,12 @@ static int rt1308_io_init(struct device *dev, struct sdw_slave *slave) regcache_cache_bypass(rt1308->regmap, true);
/* - * 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 */ - if (!rt1308->first_hw_init) { - /* set autosuspend parameters */ - pm_runtime_set_autosuspend_delay(&slave->dev, 3000); - pm_runtime_use_autosuspend(&slave->dev); - + if (!rt1308->first_hw_init) /* 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);
/* sw reset */ @@ -625,6 +615,9 @@ static int rt1308_sdw_component_probe(struct snd_soc_component *component) rt1308->component = component; rt1308_sdw_parse_dt(rt1308, &rt1308->sdw_slave->dev);
+ if (!rt1308->first_hw_init) + return 0; + ret = pm_runtime_resume(component->dev); if (ret < 0 && ret != -EACCES) return ret; @@ -700,10 +693,27 @@ static int rt1308_sdw_init(struct device *dev, struct regmap *regmap, &soc_component_sdw_rt1308, rt1308_sdw_dai, ARRAY_SIZE(rt1308_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 rt1308_sdw_probe(struct sdw_slave *slave, @@ -721,10 +731,7 @@ static int rt1308_sdw_probe(struct sdw_slave *slave,
static int rt1308_sdw_remove(struct sdw_slave *slave) { - struct rt1308_sdw_priv *rt1308 = dev_get_drvdata(&slave->dev); - - if (rt1308->first_hw_init) - pm_runtime_disable(&slave->dev); + pm_runtime_disable(&slave->dev);
return 0; }