关于imx6上的wm8962断电5分钟以上再重启系统，出现Speaker声音失真的问题

[hertzzhang]

硬件：

      cpu: imx6-dl

      codec: wm8962

系统：

uboot：2016.03

kernel：4.1.15

rootfs：Android6.0.1

现象：

imx6上的wm8962断电5分钟以上再重启系统，出现Speaker声音失真；若是断电后在较短时间(2min)内重新开机，Speaker声音基本没有出现过失真状况。确定MCLK/XTI时钟是24MHz，但是当声音失真时用示波器表笔点击该时钟输入线几次，声音就会恢复正常。请问技术大神们，这大概是什么问题导致的？有什么排查解决的思路？看上去有点像硬件的问题。

或者您可以将音频相关的设备树配置给我参考一下，下面是我的设备树配置：

$ vi kernel_imx\arch\arm\boot\dts\imx6qdl-sabresd.dtsi

&i2c1 {

clock-frequency = <100000>;

pinctrl-names = "default";

pinctrl-0 = <&pinctrl_i2c1>;

status = "okay";

codec: wm8962@1a {

compatible = "wlf,wm8962";

reg = <0x1a>;

clocks = <&clks IMX6QDL_CLK_CKO>;

DCVDD-supply = <&reg_audio>;

DBVDD-supply = <&reg_audio>;

AVDD-supply = <&reg_audio>;

CPVDD-supply = <&reg_audio>;

MICVDD-supply = <&reg_audio>;

PLLVDD-supply = <&reg_audio>;

SPKVDD1-supply = <&reg_audio>;

SPKVDD2-supply = <&reg_audio>;

spk-mono;

amic-mono;

gpio-cfg = <

0x0000 /* 0:Default */

0x0000 /* 1:Default */

0x0013 /* 2:FN_DMICCLK */

0x0000 /* 3:Default */

0x8014 /* 4:FN_DMICCDAT */

0x0000 /* 5:Default */

>;

};

};

regulators {

compatible = "simple-bus";

#address-cells = <1>;

#size-cells = <0>;

reg_audio: regulator@2 {

compatible = "regulator-fixed";

reg = <2>;

regulator-name = "wm8962-supply";

gpio = <&gpio4 10 0>;

enable-active-high;

};

sound {

compatible = "fsl,imx6q-sabresd-wm8962",

"fsl,imx-audio-wm8962";

model = "wm8962-audio";

cpu-dai = <&ssi2>;

audio-codec = <&codec>;

asrc-controller = <&asrc>;

audio-routing =

"Headphone Jack", "HPOUTL",

"Headphone Jack", "HPOUTR",

"Ext Spk", "SPKOUTL",

"Ext Spk", "SPKOUTR",

"AMIC", "MICBIAS",

"IN3R", "AMIC",

"DMIC", "MICBIAS",

"DMICDAT", "DMIC",

"CPU-Playback", "ASRC-Playback",

"Playback", "CPU-Playback",

"ASRC-Capture", "CPU-Capture",

"CPU-Capture", "Capture";

mux-int-port = <2>;

mux-ext-port = <3>;

codec-master;

hp-det-gpios = <&gpio7 8 1>;

mic-det-gpios = <&gpio1 9 1>;

};

$ vi kernel_imx\include\dt-bindings\clock\imx6qdl-clock.h

#define IMX6QDL_CLK_CKO 201

$ vi kernel_imx\arch\arm\boot\dts\imx6qdl.dtsi

clks: ccm@020c4000 {

compatible = "fsl,imx6q-ccm";

reg = <0x020c4000 0x4000>;

interrupts = <0 87 IRQ_TYPE_LEVEL_HIGH>,

<0 88 IRQ_TYPE_LEVEL_HIGH>;

#clock-cells = <1>;

};

谢谢！

[xuyuanzhi]

请问这个问题是否已解决？我有块板子也遇到相同问题。

[zhengmero]

这个问题解决了吗，我也碰到了同样的问题。

[jimmychan]

how many boards have this issue?

please check the signal integrity of MCLK.

is there a cap. connected in between clock and ground? what is the value?

if possible, could you send me the schematic of wm8962 part of your board?

[hertzzhang]

几乎每块板子都会有这个问题。

MCLK用示波器看了是24MHz，波形还算好，但是没有眼图测试仪器。

部分原理图如下：

[weidong_sun]

Hello Hertz,

    2 suggestions for your debugging the part.

(1) clock source code

In "linux/drivers/clk/imx/clk-imx6q.c "

/* * Let's initially set up CLKO with OSC24M, since
this configuration * is widely used by imx6q board designs to clock audio
codec. */

...
imx_clk_set_parent(clk[IMX6QDL_CLK_CKO2_SEL], clk[IMX6QDL_CLK_OSC]);

imx_clk_set_parent(clk[IMX6QDL_CLK_CKO], clk[IMX6QDL_CLK_CKO2]);
clk_set_rate(clk[IMX6QDL_CLK_CKO], 24000000); // add this line, please!

...

Then power on board, test audio.

(2) Remove R266 & Populate "Y3/R268/C279/C280" (断开 U23，把24MHz晶体焊上去)

Then power on board, test audio.

【Note】

      I feel there are some issues with U23, so do above test, please!

Have a nice day.