From: Shengjiu Wang <shengjiu.wang(a)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(a)nxp.com>
Link: https://lore.kernel.org/r/1651925654-32060-1-git-send-email-shengjiu.wang@n…
Signed-off-by: Mark Brown <broonie(a)kernel.org>
Signed-off-by: Sasha Levin <sashal(a)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 79ef4e269bc9..8aa6871e0d42 100644
--- a/sound/soc/fsl/fsl_micfil.c
+++ b/sound/soc/fsl/fsl_micfil.c
@@ -194,6 +194,17 @@ static int fsl_micfil_reset(struct device *dev)
if (ret)
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
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