Patch "ASoC: rt1308-sdw: fix random louder sound" has been added to the 6.4-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    ASoC: rt1308-sdw: fix random louder sound

to the 6.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     asoc-rt1308-sdw-fix-random-louder-sound.patch
and it can be found in the queue-6.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 170c944c5cafa7f4cff4e08458b7cc4992156d72
Author: Shuming Fan <shumingf@xxxxxxxxxxx>
Date:   Fri Aug 11 17:38:22 2023 +0800

    ASoC: rt1308-sdw: fix random louder sound
    
    [ Upstream commit 37aba3190891d4de189bd5192ee95220e295f34d ]
    
    This patch uses a vendor register to check whether the system hibernated ever.
    The driver will only set the preset when the driver brings up or the system hibernated.
    It will avoid the unknown issue that makes the speaker output louder and can't control the volume.
    
    Signed-off-by: Shuming Fan <shumingf@xxxxxxxxxxx
    Link: https://lore.kernel.org/r/20230811093822.37573-1-shumingf@xxxxxxxxxxx
    Signed-off-by: Mark Brown <broonie@xxxxxxxxxx
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/sound/soc/codecs/rt1308-sdw.c b/sound/soc/codecs/rt1308-sdw.c
index 1797af824f60b..e2699c0b117be 100644
--- a/sound/soc/codecs/rt1308-sdw.c
+++ b/sound/soc/codecs/rt1308-sdw.c
@@ -52,6 +52,7 @@ static bool rt1308_volatile_register(struct device *dev, unsigned int reg)
 	case 0x300a:
 	case 0xc000:
 	case 0xc710:
+	case 0xcf01:
 	case 0xc860 ... 0xc863:
 	case 0xc870 ... 0xc873:
 		return true;
@@ -213,7 +214,7 @@ static int rt1308_io_init(struct device *dev, struct sdw_slave *slave)
 {
 	struct rt1308_sdw_priv *rt1308 = dev_get_drvdata(dev);
 	int ret = 0;
-	unsigned int tmp;
+	unsigned int tmp, hibernation_flag;
 
 	if (rt1308->hw_init)
 		return 0;
@@ -242,6 +243,10 @@ static int rt1308_io_init(struct device *dev, struct sdw_slave *slave)
 
 	pm_runtime_get_noresume(&slave->dev);
 
+	regmap_read(rt1308->regmap, 0xcf01, &hibernation_flag);
+	if ((hibernation_flag != 0x00) && rt1308->first_hw_init)
+		goto _preset_ready_;
+
 	/* sw reset */
 	regmap_write(rt1308->regmap, RT1308_SDW_RESET, 0);
 
@@ -282,6 +287,12 @@ static int rt1308_io_init(struct device *dev, struct sdw_slave *slave)
 	regmap_write(rt1308->regmap, 0xc100, 0xd7);
 	regmap_write(rt1308->regmap, 0xc101, 0xd7);
 
+	/* apply BQ params */
+	rt1308_apply_bq_params(rt1308);
+
+	regmap_write(rt1308->regmap, 0xcf01, 0x01);
+
+_preset_ready_:
 	if (rt1308->first_hw_init) {
 		regcache_cache_bypass(rt1308->regmap, false);
 		regcache_mark_dirty(rt1308->regmap);