From b48f324f89ab8ee62c3448ef19445a1b292e02d3 Mon Sep 17 00:00:00 2001 From: Pierre-Louis Bossart Date: Wed, 2 Aug 2023 10:36:29 -0500 Subject: [PATCH] ASoC: max98373-sdw: enable pm_runtime in probe, keep status as 'suspended' 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 Reviewed-by: Ranjani Sridharan Reviewed-by: Rander Wang Reviewed-by: Bard Liao Link: https://lore.kernel.org/r/20230802153629.53576-17-pierre-louis.bossart@linux.intel.com Signed-off-by: Mark Brown --- 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 92d2b87..b5cb951 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; } -- 2.7.4