ASoC: fsl_micfil: explicitly clear software reset bit

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 <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>

Author: TE-N-ShengjiuWang

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;
 }