Greetings,
I'm trying to get imx8mm sai working with a tlv320aic3x codec on a new
board and am finding that the sai3 bus clock is getting derived from
the wrong source leading hw_params() to fail with 'fsl-sai
30030000.sai: failed to derive required Tx rate: 3072000'
In comparison to the imx8mm-evk I find it's clock gets configured as
desired yet I have the same device-tree configuration for sai3.
Here is my board's dts:
/ {
...
sound {
compatible = "simple-audio-card";
simple-audio-card,name = "tlv320-audio";
simple-audio-card,format = "i2s";
simple-audio-card,frame-master = <&cpudai>;
simple-audio-card,bitclock-master = <&cpudai>;
simple-audio-card,widgets =
"Line", "Left Line Out Jack",
"Line", "Right Line Out Jack";
simple-audio-card,routing =
"Left Line Out Jack", "LLOUT",
"Right Line Out Jack", "RLOUT";
cpudai: simple-audio-card,cpu {
sound-dai = <&sai3>;
dai-tdm-slot-num = <2>;
dai-tdm-slot-width = <32>;
};
simple-audio-card,codec {
sound-dai = <&tlv320aic3105>;
clocks = <&clk IMX8MM_CLK_SAI3_ROOT>;
};
};
};
&i2c2 {
...
tlv320aic3105: codec@18 {
#sound-dai-cells = <0>;
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_tlv>;
compatible = "ti,tlv320aic3x";
reg = <0x18>;
reset-gpios = <&gpio4 4 GPIO_ACTIVE_LOW>;
ai3x-micbias-vg = <2>; /* MICBIAS_2_5V */
/* Regulators */
DRVDD-supply = <®_3p3v>;
AVDD-supply = <®_3p3v>;
IOVDD-supply = <®_3p3v>;
DVDD-supply = <®_1p8v>;
};
}
&sai3 {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_sai3>;
assigned-clocks = <&clk IMX8MM_CLK_SAI3>;
assigned-clock-parents = <&clk IMX8MM_AUDIO_PLL1_OUT>;
assigned-clock-rates = <24576000>;
status = "okay";
};
and /sys/kernel/debug/clk/clk_summary from my board:
osc_24m 7 10 0 24000000
0 0 50000
...
audio_pll1_ref_sel 0 0 0 24000000
0 0 50000
audio_pll1 0 0 0 650000000
0 0 50000
audio_pll1_bypass 0 0 0 650000000
0 0 50000
audio_pll1_out 0 0 0 650000000
0 0 50000
sai3 0 0 0 25000000
0 0 50000
sai3_root_clk 0 0 0 25000000
0 0 50000
^^^^ note 25000000 instead of requested 24576000
And Here is the imx8mm-evk dts:
/ {
...
wm8524: audio-codec {
#sound-dai-cells = <0>;
compatible = "wlf,wm8524";
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_gpio_wlf>;
wlf,mute-gpios = <&gpio5 21 GPIO_ACTIVE_LOW>;
};
sound-wm8524 {
compatible = "simple-audio-card";
simple-audio-card,name = "wm8524-audio";
simple-audio-card,format = "i2s";
simple-audio-card,frame-master = <&cpudai>;
simple-audio-card,bitclock-master = <&cpudai>;
simple-audio-card,widgets =
"Line", "Left Line Out Jack",
"Line", "Right Line Out Jack";
simple-audio-card,routing =
"Left Line Out Jack", "LINEVOUTL",
"Right Line Out Jack", "LINEVOUTR";
cpudai: simple-audio-card,cpu {
sound-dai = <&sai3>;
dai-tdm-slot-num = <2>;
dai-tdm-slot-width = <32>;
};
simple-audio-card,codec {
sound-dai = <&wm8524>;
clocks = <&clk IMX8MM_CLK_SAI3_ROOT>;
};
};
};
&sai3 {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_sai3>;
assigned-clocks = <&clk IMX8MM_CLK_SAI3>;
assigned-clock-parents = <&clk IMX8MM_AUDIO_PLL1_OUT>;
assigned-clock-rates = <24576000>;
status = "okay";
};
and /sys/kernel/debug/clk/clk_summary from imx8mm_evk:
osc_24m 7 10 0 24000000
0 0 50000
...
audio_pll1_ref_sel 0 0 0 24000000
0 0 50000
audio_pll1 0 0 0 393215995
0 0 50000
audio_pll1_bypass 0 0 0 393215995
0 0 50000
audio_pll1_out 0 0 0 393215995
0 0 50000
sai3 0 0 0 24576000
0 0 50000
sai3_root_clk 0 0 0 24576000
0 0 50000
^^^^ note 24576000 as requested
Any ideas what I'm doing wrong here?
Note that even though the imx8mm-evk appears to configure its clock
correctly I still have not been able to play audio out the wm8524 and
the system appears to hang during playback as if BCLK/MCLK were not
clocking.
Perhaps there is something not supported yet upstream with regards to
IMX8MM SAI?
Best Regards,
Tim
