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/max98373-sdw.c | 40 ++++++++++++++++++--------------- 1 file changed, 22 insertions(+), 18 deletions(-)
diff --git a/sound/soc/codecs/max98373-sdw.c b/sound/soc/codecs/max98373-sdw.c index 92d2b872f9f8..b5cb951af570 100644 --- a/sound/soc/codecs/max98373-sdw.c +++ b/sound/soc/codecs/max98373-sdw.c @@ -366,22 +366,12 @@ static int max98373_io_init(struct sdw_slave *slave) regcache_cache_bypass(max98373->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 (!max98373->first_hw_init) { - /* set autosuspend parameters */ - pm_runtime_set_autosuspend_delay(dev, 3000); - pm_runtime_use_autosuspend(dev); - + if (!max98373->first_hw_init) /* update count of parent 'active' children */ pm_runtime_set_active(dev);
- /* make sure the device does not suspend immediately */ - pm_runtime_mark_last_busy(dev); - - pm_runtime_enable(dev); - } - pm_runtime_get_noresume(dev);
/* Software Reset */ @@ -774,10 +764,27 @@ static int max98373_init(struct sdw_slave *slave, struct regmap *regmap) ret = devm_snd_soc_register_component(dev, &soc_codec_dev_max98373_sdw, max98373_sdw_dai, ARRAY_SIZE(max98373_sdw_dai)); - if (ret < 0) + if (ret < 0) { dev_err(dev, "Failed to register codec: %d\n", ret); + return ret; + }
- 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 + */ + + return 0; }
static int max98373_update_status(struct sdw_slave *slave, @@ -835,10 +842,7 @@ static int max98373_sdw_probe(struct sdw_slave *slave,
static int max98373_sdw_remove(struct sdw_slave *slave) { - struct max98373_priv *max98373 = dev_get_drvdata(&slave->dev); - - if (max98373->first_hw_init) - pm_runtime_disable(&slave->dev); + pm_runtime_disable(&slave->dev);
return 0; }