[PATCH 1/2] ASoC: rt5682s: Enable ASRC auto-disable to fix pop during jack plug-in while playback

[derek.fang at realtek.com]

From: Derek Fang <derek.fang at realtek.com>

When codec's ASRC was enabled, the DA and AD filters use
the reference clk which tracks the I2S clks.
And if the I2S clks' timing of open and close are not expected,
this patch allows the filters to switch to use sysclk if
ASRC's ref clks disappeared and could fix the below possible issues:
1. Avoid DA filter to keep surplus samples.
2. Avoid that AD filter works failed during dapm's power on.

For example,
if I2S clks were closed before dacdat during playback off
due to jack unplug, it causes ref clks disappeared and
DA filter remained some samples which will produce pop noise
on the next HP playback.
ASRC auto-disable could clear the samples during the playback off.

Signed-off-by: Derek Fang <derek.fang at realtek.com>
---
 sound/soc/codecs/rt5682s.c |  3 +++
 sound/soc/codecs/rt5682s.h | 13 +++++++++++++
 2 files changed, 16 insertions(+)

diff --git a/sound/soc/codecs/rt5682s.c b/sound/soc/codecs/rt5682s.c
index 122adeb7beb1..5ae54a51ff9e 100644
--- a/sound/soc/codecs/rt5682s.c
+++ b/sound/soc/codecs/rt5682s.c
@@ -1061,6 +1061,9 @@ int rt5682s_sel_asrc_clk_src(struct snd_soc_component *component,
 			RT5682S_FILTER_CLK_SEL_MASK, clk_src << RT5682S_FILTER_CLK_SEL_SFT);
 	}
 
+	snd_soc_component_update_bits(component, RT5682S_PLL_TRACK_11,
+		RT5682S_ASRCIN_AUTO_CLKOUT_MASK, RT5682S_ASRCIN_AUTO_CLKOUT_EN);
+
 	return 0;
 }
 EXPORT_SYMBOL_GPL(rt5682s_sel_asrc_clk_src);
diff --git a/sound/soc/codecs/rt5682s.h b/sound/soc/codecs/rt5682s.h
index 55f1febb81e9..59ba4ea3b062 100644
--- a/sound/soc/codecs/rt5682s.h
+++ b/sound/soc/codecs/rt5682s.h
@@ -994,6 +994,19 @@
 #define RT5682S_ASRCIN_FTK_M2_MASK		(0x7 << 4)
 #define RT5682S_ASRCIN_FTK_M2_SFT		4
 
+/* ASRC Control 11 (0x008c) */
+#define RT5682S_ASRCIN_AUTO_CLKOUT_MASK		(0x1 << 5)
+#define RT5682S_ASRCIN_AUTO_CLKOUT_EN		(0x1 << 5)
+#define RT5682S_ASRCIN_AUTO_CLKOUT_DIS		(0x0 << 5)
+#define RT5682S_ASRCIN_AUTO_RST_MASK		(0x1 << 4)
+#define RT5682S_ASRCIN_AUTO_RST_EN		(0x1 << 4)
+#define RT5682S_ASRCIN_AUTO_RST_DIS		(0x0 << 4)
+#define RT5682S_SEL_LRCK_DET_MASK		(0x3)
+#define RT5682S_SEL_LRCK_DET_DIV8		(0x3)
+#define RT5682S_SEL_LRCK_DET_DIV4		(0x2)
+#define RT5682S_SEL_LRCK_DET_DIV2		(0x1)
+#define RT5682S_SEL_LRCK_DET_DIV1		(0x0)
+
 /* Depop Mode Control 1 (0x008e) */
 #define RT5682S_OUT_HP_L_EN			(0x1 << 6)
 #define RT5682S_OUT_HP_R_EN			(0x1 << 5)
-- 
2.17.1