[PATCH 6.6 505/638] ALSA: hda/tas2781: restore power state after system_resume

Sasha Levin
2024-03-24T23:09:37Z

From: Gergo Koteles <soyer@irl.hu>

[ Upstream commit 9fc91a6fe37c78ef301aed4251f7e50b8524e72d ]

After system_resume the amplifers will remain off, even if they were on
before system_suspend.

Use playback_started bool to save the playback state, and restore power
state based on it.

Fixes: 5be27f1e3ec9 ("ALSA: hda/tas2781: Add tas2781 HDA driver")
Signed-off-by: Gergo Koteles <soyer@irl.hu>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Message-ID: <1742b61901781826f6e6212ffe1d21af542d134a.1709918447.git.soyer@irl.hu>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
sound/pci/hda/tas2781_hda_i2c.c | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/sound/pci/hda/tas2781_hda_i2c.c b/sound/pci/hda/tas2781_hda_i2c.c
index a63860f0e283d..4c1fb4e87faaf 100644
--- a/sound/pci/hda/tas2781_hda_i2c.c
+++ b/sound/pci/hda/tas2781_hda_i2c.c
@@ -142,11 +142,13 @@ static void tas2781_hda_playback_hook(struct device *dev, int action)
pm_runtime_get_sync(dev);
mutex_lock(&tas_hda->priv->codec_lock);
tasdevice_tuning_switch(tas_hda->priv, 0);
+ tas_hda->priv->playback_started = true;
mutex_unlock(&tas_hda->priv->codec_lock);
break;
case HDA_GEN_PCM_ACT_CLOSE:
mutex_lock(&tas_hda->priv->codec_lock);
tasdevice_tuning_switch(tas_hda->priv, 1);
+ tas_hda->priv->playback_started = false;
mutex_unlock(&tas_hda->priv->codec_lock);

pm_runtime_mark_last_busy(dev);
@@ -585,6 +587,7 @@ static void tasdev_fw_ready(const struct firmware *fmw, void *context)
tasdevice_save_calibration(tas_priv);

tasdevice_tuning_switch(tas_hda->priv, 0);
+ tas_hda->priv->playback_started = true;

out:
mutex_unlock(&tas_hda->priv->codec_lock);
@@ -750,6 +753,9 @@ static int tas2781_runtime_suspend(struct device *dev)

mutex_lock(&tas_hda->priv->codec_lock);

+ /* The driver powers up the amplifiers at module load time.
+ * Stop the playback if it's unused.
+ */
if (tas_hda->priv->playback_started) {
tasdevice_tuning_switch(tas_hda->priv, 1);
tas_hda->priv->playback_started = false;
@@ -789,7 +795,8 @@ static int tas2781_system_suspend(struct device *dev)
mutex_lock(&tas_hda->priv->codec_lock);

/* Shutdown chip before system suspend */
- tasdevice_tuning_switch(tas_hda->priv, 1);
+ if (tas_hda->priv->playback_started)
+ tasdevice_tuning_switch(tas_hda->priv, 1);

mutex_unlock(&tas_hda->priv->codec_lock);

@@ -821,6 +828,10 @@ static int tas2781_system_resume(struct device *dev)
* calibrated data inside algo.
*/
tasdevice_apply_calibration(tas_hda->priv);
+
+ if (tas_hda->priv->playback_started)
+ tasdevice_tuning_switch(tas_hda->priv, 0);
+
mutex_unlock(&tas_hda->priv->codec_lock);

return 0;
--
2.43.0