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/rt1318-sdw.c | 39 +++++++++++++++++++++-------------- 1 file changed, 23 insertions(+), 16 deletions(-)
diff --git a/sound/soc/codecs/rt1318-sdw.c b/sound/soc/codecs/rt1318-sdw.c index d7803342f5c2..ff364bde4a08 100644 --- a/sound/soc/codecs/rt1318-sdw.c +++ b/sound/soc/codecs/rt1318-sdw.c @@ -413,20 +413,10 @@ static int rt1318_io_init(struct device *dev, struct sdw_slave *slave) regcache_cache_bypass(rt1318->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); @@ -686,6 +676,9 @@ static int rt1318_sdw_component_probe(struct snd_soc_component *component)
rt1318->component = component;
+ if (!rt1318->first_hw_init) + return 0; + ret = pm_runtime_resume(component->dev); dev_dbg(&rt1318->sdw_slave->dev, "%s pm_runtime_resume, ret=%d", __func__, ret); if (ret < 0 && ret != -EACCES) @@ -765,8 +758,25 @@ static int rt1318_sdw_init(struct device *dev, struct regmap *regmap, &soc_component_sdw_rt1318, rt1318_sdw_dai, ARRAY_SIZE(rt1318_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); + + /* 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 ret; } @@ -786,10 +796,7 @@ static int rt1318_sdw_probe(struct sdw_slave *slave,
static int rt1318_sdw_remove(struct sdw_slave *slave) { - struct rt1318_sdw_priv *rt1318 = dev_get_drvdata(&slave->dev); - - if (rt1318->first_hw_init) - pm_runtime_disable(&slave->dev); + pm_runtime_disable(&slave->dev);
return 0; }