Received-SPF: pass (google.com: domain of linux-kernel+bounces-97411-linux.lists.archive=gmail.com@vger.kernel.org designates 147.75.199.223 as permitted sender) client-ip=147.75.199.223;
From: Gergo Koteles <soyer@irl.hu>
To: Shenghao Ding <shenghao-ding@ti.com>, Kevin Lu <kevin-lu@ti.com>,
  Baojun Xu <baojun.xu@ti.com>, Jaroslav Kysela <perex@perex.cz>,
  Takashi Iwai <tiwai@suse.com>
Cc: alsa-devel@alsa-project.org, linux-sound@vger.kernel.org,
  linux-kernel@vger.kernel.org, Gergo Koteles <soyer@irl.hu>
Subject: [PATCH 5/5] ALSA: hda/tas2781: restore power state after system_resume
Date: Fri,  8 Mar 2024 18:41:44 +0100
Message-ID: <1742b61901781826f6e6212ffe1d21af542d134a.1709918447.git.soyer@irl.hu>
In-Reply-To: <cover.1709918447.git.soyer@irl.hu>
References: <cover.1709918447.git.soyer@irl.hu>
Precedence: bulk
Mime-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit

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>
---
 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 a99f490c6a23..7aef93126ed0 100644
--- a/sound/pci/hda/tas2781_hda_i2c.c
+++ b/sound/pci/hda/tas2781_hda_i2c.c
@@ -160,11 +160,13 @@ 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);
@@ -666,6 +668,7 @@ 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);
@@ -837,6 +840,9 @@ 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;
@@ -876,7 +882,8 @@ 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);
 
@@ -908,6 +915,10 @@ 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;
-- 
2.44.0