[PATCH 5.15 04/14] ASoC: fsl_micfil: explicitly clear software reset bit

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

From: Shengjiu Wang <shengjiu.wang@nxp.com>

[ Upstream commit 292709b9cf3ba470af94b62c9bb60284cc581b79 ]

SRES is self-cleared bit, but REG_MICFIL_CTRL1 is defined as
non volatile register, it still remain in regmap cache after set,
then every update of REG_MICFIL_CTRL1, software reset happens.
to avoid this, clear it explicitly.

Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Link: https://lore.kernel.org/r/1651925654-32060-1-git-send-email-shengjiu.wang@nxp.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 sound/soc/fsl/fsl_micfil.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/sound/soc/fsl/fsl_micfil.c b/sound/soc/fsl/fsl_micfil.c
index 9f90989ac59a..cb84d95c3aac 100644
--- a/sound/soc/fsl/fsl_micfil.c
+++ b/sound/soc/fsl/fsl_micfil.c
@@ -191,6 +191,17 @@ static int fsl_micfil_reset(struct device *dev)
 		return ret;
 	}
 
+	/*
+	 * SRES is self-cleared bit, but REG_MICFIL_CTRL1 is defined
+	 * as non-volatile register, so SRES still remain in regmap
+	 * cache after set, that every update of REG_MICFIL_CTRL1,
+	 * software reset happens. so clear it explicitly.
+	 */
+	ret = regmap_clear_bits(micfil->regmap, REG_MICFIL_CTRL1,
+				MICFIL_CTRL1_SRES);
+	if (ret)
+		return ret;
+
 	return 0;
 }
 
-- 
2.35.1