ASoC: rt711-sdca: enable pm_runtime in probe, keep status as 'suspended'

In stress cases involving module insertion/removal followed by
playback/capture, it can happen that capture/playback is started
before the codec enumeration completes.

The codec driver registers its components with the ASoC framework
during the probe stage, so there is currently no way for the card
creation to wait for the codec enumeration/initialization to complete.

In addition, when the capture/playback starts, the ASoC framework uses
pm_runtime_get_sync() to properly refcount and power-manage
devices. This is problematic in the SoundWire case because pm_runtime
is enabled during the enumeration/initialization stage, so
pm_runtime_get_sync() will return -EACCESS which is
ignored. Additional errors will happen when setting the pm_runtime
status as 'active' because the parent is not properly resumed,
resulting in an error such as:

"rt711 sdw:0:025d:0711:00: runtime PM trying to activate child device
sdw:0:025d:0711:00 but parent (sdw-master-0) is not active"

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.

Closes: https://github.com/thesofproject/linux/issues/4328
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>
Link: https://lore.kernel.org/r/20230802153629.53576-6-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 1 insertions, 2 deletions

diff --git a/sound/soc/codecs/rt711-sdca-sdw.c b/sound/soc/codecs/rt711-sdca-sdw.c
index 23f23f714b39..935e597022d3 100644
--- a/sound/soc/codecs/rt711-sdca-sdw.c
+++ b/sound/soc/codecs/rt711-sdca-sdw.c
@@ -366,8 +366,7 @@ static int rt711_sdca_sdw_remove(struct sdw_slave *slave)
 		cancel_delayed_work_sync(&rt711->jack_btn_check_work);
 	}
 
-	if (rt711->first_hw_init)
-		pm_runtime_disable(&slave->dev);
+	pm_runtime_disable(&slave->dev);
 
 	mutex_destroy(&rt711->calibrate_mutex);
 	mutex_destroy(&rt711->disable_irq_lock);