[L/Unstable] [PATCH 16/16] ALSA: hda: cs35l41: Ensure amp is only unmuted during playback

[Kai-Heng Feng]

From: Stefan Binding <sbinding at opensource.cirrus.com>

BugLink: https://bugs.launchpad.net/bugs/2029199

Currently we only mute after playback has finished, and unmute
prior to setting global enable. To prevent any possible pops
and clicks, mute at probe, and then only unmute after global
enable is set.

Signed-off-by: Stefan Binding <sbinding at opensource.cirrus.com>
Link: https://lore.kernel.org/r/20230721151816.2080453-12-sbinding@opensource.cirrus.com
Signed-off-by: Takashi Iwai <tiwai at suse.de>
(cherry picked from commit 2d816d4f92086ca0a7b79198794012076b4cab0b linux-next)
Signed-off-by: Kai-Heng Feng <kai.heng.feng at canonical.com>
---
 sound/pci/hda/cs35l41_hda.c | 22 ++++++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

diff --git a/sound/pci/hda/cs35l41_hda.c b/sound/pci/hda/cs35l41_hda.c
index 3e1eb63f0c15..3d7bf9866ebd 100644
--- a/sound/pci/hda/cs35l41_hda.c
+++ b/sound/pci/hda/cs35l41_hda.c
@@ -58,8 +58,6 @@ static const struct reg_sequence cs35l41_hda_config[] = {
 	{ CS35L41_DSP1_RX3_SRC,         0x00000018 }, // DSP1RX3 SRC = VMON
 	{ CS35L41_DSP1_RX4_SRC,         0x00000019 }, // DSP1RX4 SRC = IMON
 	{ CS35L41_DSP1_RX5_SRC,         0x00000020 }, // DSP1RX5 SRC = ERRVOL
-	{ CS35L41_AMP_DIG_VOL_CTRL,	0x00008000 }, // AMP_HPF_PCM_EN = 1, AMP_VOL_PCM  0.0 dB
-	{ CS35L41_AMP_GAIN_CTRL,	0x00000084 }, // AMP_GAIN_PCM 4.5 dB
 };
 
 static const struct reg_sequence cs35l41_hda_config_dsp[] = {
@@ -82,6 +80,14 @@ static const struct reg_sequence cs35l41_hda_config_dsp[] = {
 	{ CS35L41_DSP1_RX3_SRC,         0x00000018 }, // DSP1RX3 SRC = VMON
 	{ CS35L41_DSP1_RX4_SRC,         0x00000019 }, // DSP1RX4 SRC = IMON
 	{ CS35L41_DSP1_RX5_SRC,         0x00000029 }, // DSP1RX5 SRC = VBSTMON
+};
+
+static const struct reg_sequence cs35l41_hda_unmute[] = {
+	{ CS35L41_AMP_DIG_VOL_CTRL,	0x00008000 }, // AMP_HPF_PCM_EN = 1, AMP_VOL_PCM  0.0 dB
+	{ CS35L41_AMP_GAIN_CTRL,	0x00000084 }, // AMP_GAIN_PCM 4.5 dB
+};
+
+static const struct reg_sequence cs35l41_hda_unmute_dsp[] = {
 	{ CS35L41_AMP_DIG_VOL_CTRL,	0x00008000 }, // AMP_HPF_PCM_EN = 1, AMP_VOL_PCM  0.0 dB
 	{ CS35L41_AMP_GAIN_CTRL,	0x00000233 }, // AMP_GAIN_PCM = 17.5dB AMP_GAIN_PDM = 19.5dB
 };
@@ -522,6 +528,13 @@ static void cs35l41_hda_play_done(struct device *dev)
 
 	cs35l41_global_enable(dev, reg, cs35l41->hw_cfg.bst_type, 1, NULL,
 			      cs35l41->firmware_running);
+	if (cs35l41->firmware_running) {
+		regmap_multi_reg_write(reg, cs35l41_hda_unmute_dsp,
+				       ARRAY_SIZE(cs35l41_hda_unmute_dsp));
+	} else {
+		regmap_multi_reg_write(reg, cs35l41_hda_unmute,
+				       ARRAY_SIZE(cs35l41_hda_unmute));
+	}
 }
 
 static void cs35l41_hda_pause_start(struct device *dev)
@@ -1620,6 +1633,11 @@ int cs35l41_hda_probe(struct device *dev, const char *device_name, int id, int i
 	if (ret)
 		goto err;
 
+	ret = regmap_multi_reg_write(cs35l41->regmap, cs35l41_hda_mute,
+				     ARRAY_SIZE(cs35l41_hda_mute));
+	if (ret)
+		goto err;
+
 	INIT_WORK(&cs35l41->fw_load_work, cs35l41_fw_load_work);
 	mutex_init(&cs35l41->fw_mutex);
 
-- 
2.34.1