linux-kernel - [PATCH v2 2/3] ASoC: rt9120: Fix clock auto sync issue when fs is the multiple of 48

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Date:   Wed, 10 Nov 2021 11:45:20 +0800
From:   cy_huang <u0084500@...il.com>
To:     broonie@...nel.org, perex@...ex.cz, tiwai@...e.com
Cc:     oder_chiou@...ltek.com, lgirdwood@...il.com,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        cy_huang@...htek.com, allen_lin@...htek.com
Subject: [PATCH v2 2/3] ASoC: rt9120: Fix clock auto sync issue when fs is the multiple of 48

From: ChiYuan Huang <cy_huang@...htek.com>

If fs is divided by 48, to make audio clock sync rate correct, internal
sync function have be disabled.

Signed-off-by: ChiYuan Huang <cy_huang@...htek.com>
---
 sound/soc/codecs/rt9120.c | 24 +++++++++++++++++++-----
 1 file changed, 19 insertions(+), 5 deletions(-)

diff --git a/sound/soc/codecs/rt9120.c b/sound/soc/codecs/rt9120.c
index 032c520..981aead 100644
--- a/sound/soc/codecs/rt9120.c
+++ b/sound/soc/codecs/rt9120.c
@@ -26,6 +26,7 @@
 #define RT9120_REG_INTERNAL0	0x65
 #define RT9120_REG_INTERNAL1	0x69
 #define RT9120_REG_UVPOPT	0x6C
+#define RT9120_REG_DIGCFG	0xF8
 
 #define RT9120_VID_MASK		GENMASK(15, 8)
 #define RT9120_SWRST_MASK	BIT(7)
@@ -46,6 +47,7 @@
 #define RT9120_CFG_WORDLEN_24	24
 #define RT9120_CFG_WORDLEN_32	32
 #define RT9120_DVDD_UVSEL_MASK	GENMASK(5, 4)
+#define RT9120_AUTOSYNC_MASK	BIT(6)
 
 #define RT9120_VENDOR_ID	0x4200
 #define RT9120_RESET_WAITMS	20
@@ -200,8 +202,8 @@ static int rt9120_hw_params(struct snd_pcm_substream *substream,
 			    struct snd_soc_dai *dai)
 {
 	struct snd_soc_component *comp = dai->component;
-	unsigned int param_width, param_slot_width;
-	int width;
+	unsigned int param_width, param_slot_width, auto_sync;
+	int width, fs;
 
 	switch (width = params_width(param)) {
 	case 16:
@@ -239,6 +241,16 @@ static int rt9120_hw_params(struct snd_pcm_substream *substream,
 
 	snd_soc_component_update_bits(comp, RT9120_REG_I2SWL,
 				      RT9120_AUDWL_MASK, param_slot_width);
+
+	fs = width * params_channels(param);
+	/* If fs is divided by 48, disable auto sync */
+	if (fs % 48 == 0)
+		auto_sync = 0;
+	else
+		auto_sync = RT9120_AUTOSYNC_MASK;
+
+	snd_soc_component_update_bits(comp, RT9120_REG_DIGCFG,
+				      RT9120_AUTOSYNC_MASK, auto_sync);
 	return 0;
 }
 
@@ -280,7 +292,8 @@ static const struct regmap_range rt9120_rd_yes_ranges[] = {
 	regmap_reg_range(0x3A, 0x40),
 	regmap_reg_range(0x65, 0x65),
 	regmap_reg_range(0x69, 0x69),
-	regmap_reg_range(0x6C, 0x6C)
+	regmap_reg_range(0x6C, 0x6C),
+	regmap_reg_range(0xF8, 0xF8)
 };
 
 static const struct regmap_access_table rt9120_rd_table = {
@@ -298,7 +311,8 @@ static const struct regmap_range rt9120_wr_yes_ranges[] = {
 	regmap_reg_range(0x40, 0x40),
 	regmap_reg_range(0x65, 0x65),
 	regmap_reg_range(0x69, 0x69),
-	regmap_reg_range(0x6C, 0x6C)
+	regmap_reg_range(0x6C, 0x6C),
+	regmap_reg_range(0xF8, 0xF8)
 };
 
 static const struct regmap_access_table rt9120_wr_table = {
@@ -369,7 +383,7 @@ static int rt9120_reg_write(void *context, unsigned int reg, unsigned int val)
 static const struct regmap_config rt9120_regmap_config = {
 	.reg_bits = 8,
 	.val_bits = 32,
-	.max_register = RT9120_REG_UVPOPT,
+	.max_register = RT9120_REG_DIGCFG,
 
 	.reg_read = rt9120_reg_read,
 	.reg_write = rt9120_reg_write,
-- 
2.7.4