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/rt715-sdca-sdw.c | 5 +---- sound/soc/codecs/rt715-sdca.c | 34 ++++++++++++++++++++++--------- 2 files changed, 25 insertions(+), 14 deletions(-)
diff --git a/sound/soc/codecs/rt715-sdca-sdw.c b/sound/soc/codecs/rt715-sdca-sdw.c index df10916bab46..ab54a67a27eb 100644 --- a/sound/soc/codecs/rt715-sdca-sdw.c +++ b/sound/soc/codecs/rt715-sdca-sdw.c @@ -193,10 +193,7 @@ static int rt715_sdca_sdw_probe(struct sdw_slave *slave,
static int rt715_sdca_sdw_remove(struct sdw_slave *slave) { - struct rt715_sdca_priv *rt715 = dev_get_drvdata(&slave->dev); - - if (rt715->first_hw_init) - pm_runtime_disable(&slave->dev); + pm_runtime_disable(&slave->dev);
return 0; } diff --git a/sound/soc/codecs/rt715-sdca.c b/sound/soc/codecs/rt715-sdca.c index 176340a43446..9fa96fd83d4a 100644 --- a/sound/soc/codecs/rt715-sdca.c +++ b/sound/soc/codecs/rt715-sdca.c @@ -761,8 +761,12 @@ static const struct snd_soc_dapm_route rt715_sdca_audio_map[] = {
static int rt715_sdca_probe(struct snd_soc_component *component) { + struct rt715_sdca_priv *rt715 = snd_soc_component_get_drvdata(component); int ret;
+ if (!rt715->first_hw_init) + return 0; + ret = pm_runtime_resume(component->dev); if (ret < 0 && ret != -EACCES) return ret; @@ -992,6 +996,25 @@ int rt715_sdca_init(struct device *dev, struct regmap *mbq_regmap, &soc_codec_dev_rt715_sdca, rt715_sdca_dai, ARRAY_SIZE(rt715_sdca_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(dev, "%s\n", __func__);
return ret; } @@ -1008,21 +1031,12 @@ int rt715_sdca_io_init(struct device *dev, struct sdw_slave *slave) regcache_cache_only(rt715->mbq_regmap, false);
/* - * 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 (!rt715->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 */ 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); - rt715->first_hw_init = true; }