ASoC: rt5682: fix the random recording noise of headset

The cycle time of FIFO clock should increase 2 times to avoid
the random recording noise issue.
This setting could apply to all known situations in i2s mode.
Signed-off-by: Shuming Fan <shumingf@realtek.com>
Link: https://lore.kernel.org/r/20200317073308.11572-1-shumingf@realtek.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/rt5682.c

@@ -2651,6 +2651,8 @@ static int rt5682_i2c_probe(struct i2c_client *i2c,
 			RT5682_CP_CLK_HP_MASK, RT5682_CP_CLK_HP_300KHZ);
 	regmap_update_bits(rt5682->regmap, RT5682_HP_CHARGE_PUMP_1,
 			RT5682_PM_HP_MASK, RT5682_PM_HP_HV);
+	regmap_update_bits(rt5682->regmap, RT5682_DMIC_CTRL_1,
+			RT5682_FIFO_CLK_DIV_MASK, RT5682_FIFO_CLK_DIV_2);
 
 	INIT_DELAYED_WORK(&rt5682->jack_detect_work,
 				rt5682_jack_detect_handler);

sound/soc/codecs/rt5682.h

@@ -651,6 +651,8 @@
 #define RT5682_DMIC_1_EN_SFT			15
 #define RT5682_DMIC_1_DIS			(0x0 << 15)
 #define RT5682_DMIC_1_EN			(0x1 << 15)
+#define RT5682_FIFO_CLK_DIV_MASK		(0x7 << 12)
+#define RT5682_FIFO_CLK_DIV_2			(0x1 << 12)
 #define RT5682_DMIC_1_DP_MASK			(0x3 << 4)
 #define RT5682_DMIC_1_DP_SFT			4
 #define RT5682_DMIC_1_DP_GPIO2			(0x0 << 4)