From f061e2be8689057cb4ec0dbffa9f03e1a23cdcb2 Mon Sep 17 00:00:00 2001
From: Mark Brown <broonie@kernel.org>
Date: Sun, 23 Jul 2023 00:27:22 +0100
Subject: [PATCH] ASoC: wm8904: Fill the cache for WM8904_ADC_TEST_0 register
Git-commit: f061e2be8689057cb4ec0dbffa9f03e1a23cdcb2
Patch-mainline: v6.5-rc4
References: git-fixes

The WM8904_ADC_TEST_0 register is modified as part of updating the OSR
controls but does not have a cache default, leading to errors when we try
to modify these controls in cache only mode with no prior read:

wm8904 3-001a: ASoC: error at snd_soc_component_update_bits on wm8904.3-001a for register: [0x000000c6] -16

Add a read of the register to probe() to fill the cache and avoid both the
error messages and the misconfiguration of the chip which will result.

Acked-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20230723-asoc-fix-wm8904-adc-test-read-v1-1-2cdf2edd83fd@kernel.org
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 sound/soc/codecs/wm8904.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sound/soc/codecs/wm8904.c b/sound/soc/codecs/wm8904.c
index 068e610b1b4c..f2baee7c332e 100644
--- a/sound/soc/codecs/wm8904.c
+++ b/sound/soc/codecs/wm8904.c
@@ -2308,6 +2308,9 @@ static int wm8904_i2c_probe(struct i2c_client *i2c)
 	regmap_update_bits(wm8904->regmap, WM8904_BIAS_CONTROL_0,
 			    WM8904_POBCTRL, 0);
 
+	/* Fill the cache for the ADC test register */
+	regmap_read(wm8904->regmap, WM8904_ADC_TEST_0, &val);
+
 	/* Can leave the device powered off until we need it */
 	regcache_cache_only(wm8904->regmap, true);
 	regulator_bulk_disable(ARRAY_SIZE(wm8904->supplies), wm8904->supplies);
-- 
2.35.3