Problem with Android audio through WM8960 codec.
Audio card was successfully probed and mapped (showed in dmesg logs).
I have tried to play audio from adb shell using following command:
tinyplay /data/test.wav -D 0 -d 0
No errors is printed and no sound from speaker. Then I have tried standard Android audio player and logcat contains errors.
2020-05-17 13:52:46.579 259-1568/? D/AudioHardwareTiny: AudioData write error , keep slience! ret = -1
2020-05-17 13:52:46.591 259-1568/? W/StreamHAL: Error from HAL stream in function get_presentation_position: Operation not permitted
What is the changes I should to do with tinyalsa to make wm8960 codec working ?
Does the simaple-audio-card have ingratiation with tinyalsa?
Is there any documentation regarding adding codec to Android?
Installation steps described below
In the Android source code I have found codec source code (kernel/sound/soc/codecs/wm8960.c) and enabled it through menuconfig.
(Also HDMI audio was disabled to remove sound cards from the list. Only wm8960_sound is exist in the list)
I have updated DTS configuration for android (kernel/arch/arm64/boot/dts/rockchip/rk3399-khadas-edge-android.dts):
Added sound card to root node
wm8960_sound {
compatible = "simple-audio-card";
simple-audio-card,format = "i2s";
simple-audio-card,name = "RKWM8960";
status = "okay";
// pinctrl-names = "default";
simple-audio-card,mclk-fs = <256>;
// simple-audio-card,hp-det-gpio = <&gpio1 0 GPIO_ACTIVE_HIGH>;
simple-audio-card,widgets =
"Microphone", "Mic Jack",
"Line", "Line In",
"Line", "Line Out",
"Speaker", "Speaker",
"Headphone", "Headphone Jack";
simple-audio-card,routing =
"Headphone Jack", "HP_L",
"Headphone Jack", "HP_R",
"Speaker", "SPK_LP",
"Speaker", "SPK_LN",
"Speaker", "SPK_RP",
"Speaker", "SPK_RN",
"LINPUT1", "Mic Jack",
"LINPUT3", "Mic Jack",
"RINPUT1", "Mic Jack",
"RINPUT2", "Mic Jack";
simple-audio-card,cpu {
sound-dai = <&i2s0>;
};
simple-audio-card,codec {
sound-dai = <&wm8960>;
};
};
Enabled i2s0
&i2s0 {
status = "okay";
rockchip,i2s-broken-burst-len;
rockchip,playback-channels = <2>;
#sound-dai-cells = <0>;
};
Added driver to i2c0
&i2c0 {
status = "okay";
i2c-scl-rising-time-ns = <600>;
i2c-scl-falling-time-ns = <20>;
wm8960: wm8960@1a {
compatible = "wlf,wm8960";
reg = <0x1a>;
#sound-dai-cells = <0>;
/* MCLK source is a stand-alone oscillator */
clock-frequency = <12288000>;
clocks = <&cru SCLK_I2S_8CH_OUT>;
clock-names = "mclk";
pinctrl-names = "default";
pinctrl-0 = <&i2s_8ch_mclk>;
status = "okay";
wlf,shared-lrclk;
// wlf,capless;
};
};
Hardware
Khadas Edge-V
WM8960 Audio HAT
