From: Wonjoon Lee <woojoo....@samsung.com>

Pop happens when mclk applied but dmic's own boot-time
Specify dmic delay times in dt to make sure
clocks are ready earlier than dmic working

Signed-off-by: Wonjoon Lee <woojoo....@samsung.com>
Signed-off-by: Xing Zheng <zhengx...@rock-chips.com>
---

Changes in v2:
- rename dmic-delay to dmic-wakeup-delay-ms

 .../bindings/sound/rockchip,rk3399-gru-sound.txt           |  7 +++++++
 sound/soc/rockchip/rk3399_gru_sound.c                      | 14 ++++++++++++++
 2 files changed, 21 insertions(+)

diff --git 
a/Documentation/devicetree/bindings/sound/rockchip,rk3399-gru-sound.txt 
b/Documentation/devicetree/bindings/sound/rockchip,rk3399-gru-sound.txt
index f19b6c8..eac91db 100644
--- a/Documentation/devicetree/bindings/sound/rockchip,rk3399-gru-sound.txt
+++ b/Documentation/devicetree/bindings/sound/rockchip,rk3399-gru-sound.txt
@@ -6,10 +6,17 @@ Required properties:
   connected to the codecs
 - rockchip,codec: The phandle of the MAX98357A/RT5514/DA7219 codecs
 
+Optional properties:
+- dmic-wakeup-delay-ms : specify delay time (ms) for DMIC ready.
+  If this option is specified, which means it's required dmic need
+  delay for DMIC to ready so that rt5514 can avoid recording before
+  DMIC send valid data
+
 Example:
 
 sound {
        compatible = "rockchip,rk3399-gru-sound";
        rockchip,cpu = <&i2s0>;
        rockchip,codec = <&max98357a &rt5514 &da7219>;
+       dmic-wakeup-delay-ms = <20>;
 };
diff --git a/sound/soc/rockchip/rk3399_gru_sound.c 
b/sound/soc/rockchip/rk3399_gru_sound.c
index ee06489..9ed735a 100644
--- a/sound/soc/rockchip/rk3399_gru_sound.c
+++ b/sound/soc/rockchip/rk3399_gru_sound.c
@@ -38,6 +38,8 @@
 
 #define SOUND_FS       256
 
+unsigned int rt5514_dmic_delay;
+
 static struct snd_soc_jack rockchip_sound_jack;
 
 static const struct snd_soc_dapm_widget rockchip_dapm_widgets[] = {
@@ -123,6 +125,9 @@ static int rockchip_sound_rt5514_hw_params(struct 
snd_pcm_substream *substream,
                return ret;
        }
 
+       /* Wait for DMIC stable */
+       msleep(rt5514_dmic_delay);
+
        return 0;
 }
 
@@ -343,6 +348,15 @@ static int rockchip_sound_probe(struct platform_device 
*pdev)
                return -ENODEV;
        }
 
+       /* Set DMIC delay */
+       ret = device_property_read_u32(&pdev->dev, "dmic-delay",
+                                       &rt5514_dmic_delay);
+       if (ret) {
+               rt5514_dmic_delay = 0;
+               dev_dbg(&pdev->dev,
+                       "no optional property 'dmic-delay' found, default: no 
delay\n");
+       }
+
        rockchip_dailinks[DAILINK_RT5514_DSP].cpu_name = 
kstrdup_const(dev_name(dev), GFP_KERNEL);
        rockchip_dailinks[DAILINK_RT5514_DSP].cpu_dai_name = 
kstrdup_const(dev_name(dev), GFP_KERNEL);
        rockchip_dailinks[DAILINK_RT5514_DSP].platform_name = 
kstrdup_const(dev_name(dev), GFP_KERNEL);
-- 
1.9.1


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