[PATCH 2/8] ASoC: tegra: Fix AMX byte map

[Sameer Pujar]

From: Sheetal <sheetal@xxxxxxxxxx>

Byte mask for channel-1 of stream-1 is not getting enabled and this
causes failures during AMX use cases. The enable bit is not set during
put() callback of byte map mixer control.

This happens because the byte map value 0 matches the initial state
of byte map array and put() callback returns without doing anything.

Fix the put() callback by actually looking at the byte mask array
to identify if any change is needed and update the fields accordingly.
Also update get() callback to return 256 if the byte map is disabled.

Fixes: 8db78ace1ba8 ("ASoC: tegra: Fix kcontrol put callback in AMX")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Sheetal <sheetal@xxxxxxxxxx>
Reviewed-by: Mohan Kumar D <mkumard@xxxxxxxxxx>
Reviewed-by: Sameer Pujar <spujar@xxxxxxxxxx>
---
 sound/soc/tegra/tegra210_amx.c | 30 ++++++++++++------------------
 1 file changed, 12 insertions(+), 18 deletions(-)

diff --git a/sound/soc/tegra/tegra210_amx.c b/sound/soc/tegra/tegra210_amx.c
index 782a141..1410e8b 100644
--- a/sound/soc/tegra/tegra210_amx.c
+++ b/sound/soc/tegra/tegra210_amx.c
@@ -2,7 +2,7 @@
 //
 // tegra210_amx.c - Tegra210 AMX driver
 //
-// Copyright (c) 2021 NVIDIA CORPORATION.  All rights reserved.
+// Copyright (c) 2021-2023 NVIDIA CORPORATION.  All rights reserved.
 
 #include <linux/clk.h>
 #include <linux/device.h>
@@ -206,7 +206,7 @@ static int tegra210_amx_get_byte_map(struct snd_kcontrol *kcontrol,
 	if (enabled)
 		ucontrol->value.integer.value[0] = bytes_map[reg];
 	else
-		ucontrol->value.integer.value[0] = 0;
+		ucontrol->value.integer.value[0] = 256;
 
 	return 0;
 }
@@ -221,25 +221,19 @@ static int tegra210_amx_put_byte_map(struct snd_kcontrol *kcontrol,
 	unsigned char *bytes_map = (unsigned char *)&amx->map;
 	int reg = mc->reg;
 	int value = ucontrol->value.integer.value[0];
+	unsigned int mask_val = amx->byte_mask[reg / 32];
 
-	if (value == bytes_map[reg])
+	if (value >= 0 && value <= 255)
+		mask_val |= (1 << (reg % 32));
+	else
+		mask_val &= ~(1 << (reg % 32));
+
+	if (mask_val == amx->byte_mask[reg / 32])
 		return 0;
 
-	if (value >= 0 && value <= 255) {
-		/* Update byte map and enable slot */
-		bytes_map[reg] = value;
-		if (reg > 31)
-			amx->byte_mask[1] |= (1 << (reg - 32));
-		else
-			amx->byte_mask[0] |= (1 << reg);
-	} else {
-		/* Reset byte map and disable slot */
-		bytes_map[reg] = 0;
-		if (reg > 31)
-			amx->byte_mask[1] &= ~(1 << (reg - 32));
-		else
-			amx->byte_mask[0] &= ~(1 << reg);
-	}
+	/* Update byte map and slot */
+	bytes_map[reg] = value % 256;
+	amx->byte_mask[reg / 32] = mask_val;
 
 	return 1;
 }
-- 
2.7.4