nau8822_suspend() disables all codec supplies and marks the register
cache dirty, but leaves regmap in live I/O mode. Resume then attempts
the cache replay without first leaving a corresponding cache-only state.

Enter cache-only mode after the regulators have been disabled
successfully, leave it after the supplies are restored, and stop the
local resume sequence if cache replay fails. Do not power the codec back
down on a resume error, because deferred component resume remains best
effort and continues after the callback.

regulator_bulk_disable() restores regulators already disabled by the
same bulk operation if a later disable fails. Only publish cache-only
state after the whole power-off operation succeeds, so the regmap state
continues to match the hardware state on either outcome.

Fixes: 1e3cb6c321be ("ASoC: nau8822: new codec driver")
Signed-off-by: Pengpeng Hou <pengpeng@iscas.ac.cn>
---
 sound/soc/codecs/nau8822.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/sound/soc/codecs/nau8822.c b/sound/soc/codecs/nau8822.c
index 830164e991a79..889c3b5f6d04f 100644
--- a/sound/soc/codecs/nau8822.c
+++ b/sound/soc/codecs/nau8822.c
@@ -1059,10 +1059,14 @@ static int nau8822_suspend(struct snd_soc_component *component)
 {
 	struct nau8822 *nau8822 = snd_soc_component_get_drvdata(component);
 	struct snd_soc_dapm_context *dapm = snd_soc_component_to_dapm(component);
+	int ret;
 
 	snd_soc_dapm_force_bias_level(dapm, SND_SOC_BIAS_OFF);
-	regulator_bulk_disable(NAU8822_NUM_SUPPLIES, nau8822->supplies);
+	ret = regulator_bulk_disable(NAU8822_NUM_SUPPLIES, nau8822->supplies);
+	if (ret)
+		return ret;
 
+	regcache_cache_only(nau8822->regmap, true);
 	regcache_mark_dirty(nau8822->regmap);
 
 	return 0;
@@ -1072,7 +1076,9 @@ static int nau8822_resume(struct snd_soc_component *component)
 {
 	struct nau8822 *nau8822 = snd_soc_component_get_drvdata(component);
 	struct snd_soc_dapm_context *dapm = snd_soc_component_to_dapm(component);
-	int ret = regulator_bulk_enable(NAU8822_NUM_SUPPLIES, nau8822->supplies);
+	int ret;
+
+	ret = regulator_bulk_enable(NAU8822_NUM_SUPPLIES, nau8822->supplies);
 
 	if (ret) {
 		dev_err(component->dev,
@@ -1082,7 +1088,10 @@ static int nau8822_resume(struct snd_soc_component *component)
 
 	fsleep(100);
 
-	regcache_sync(nau8822->regmap);
+	regcache_cache_only(nau8822->regmap, false);
+	ret = regcache_sync(nau8822->regmap);
+	if (ret)
+		return ret;
 
 	snd_soc_dapm_force_bias_level(dapm, SND_SOC_BIAS_STANDBY);

base-commit: 32b4e6b134c62e14291206da331891e99e2fb63d
-- 
2.50.1

On Sun, 30 Aug 2026 22:18:28 +0800, Pengpeng Hou wrote:
> ASoC: nau8822: keep regcache offline while supplies are off

Applied to

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-7.4

Thanks!

[1/1] ASoC: nau8822: keep regcache offline while supplies are off
      https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git/commit/?id=9c343445b349422bddebb4cb9668c246bc6f08de

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark