I2s slave bit clock and frame

VIM4
1

Which system do you use? Android, Ubuntu, OOWOW or others?

`Ubuntu

Which version of system do you use? Khadas official images, self built images, or others?

Khadas official images

Please describe your issue below:

How can I setting the VIM4 to have bit clock and frame clock of I2s as slave instead master?

Post a console log of your issue below:


**Delete this line and post your log here.**
2

Can you try this?

diff --git a/arch/arm64/boot/dts/amlogic/kvim4.dts b/arch/arm64/boot/dts/amlogic/kvim4.dts
index 84c6bdad7f96..a73561b9b70a 100644
--- a/arch/arm64/boot/dts/amlogic/kvim4.dts
+++ b/arch/arm64/boot/dts/amlogic/kvim4.dts
@@ -585,11 +585,11 @@
                        //bitclock-inversion;
                        //frame-inversion;
                        /* master mode */
-                       bitclock-master = <&tdmb>;
-                       frame-master = <&tdmb>;
+                       //bitclock-master = <&tdmb>;
+                       //frame-master = <&tdmb>;
                        /* slave mode */
-                       //bitclock-master = <&tdmbcodec>;
-                       //frame-master = <&tdmbcodec>;
+                       bitclock-master = <&tdmbcodec>;
+                       frame-master = <&tdmbcodec>;
                        /* suffix-name, sync with android audio hal used for */
                        suffix-name = "alsaPORT-i2s-i2s4hdmirx";
                        cpu {
3

Thank you, I did this yesterday but with the logic analyzer bit clock and frame clock are out, can you give me the file .dts or .dtbo so I can understand my errors?

4

I see now that it’s the kvim4.dts in the linux kernel , so if I modify in the GitHub - khadas/linux at khadas-vims-5.4.y how can I rebuild it to install in my vim4, can you describe step to step procedure?

5

Please apply the patch:

diff --git a/arch/arm64/boot/dts/amlogic/kvim4.dts b/arch/arm64/boot/dts/amlogic/kvim4.dts
index 84c6bdad7f96..98e02299642d 100644
--- a/arch/arm64/boot/dts/amlogic/kvim4.dts
+++ b/arch/arm64/boot/dts/amlogic/kvim4.dts
@@ -585,11 +585,11 @@
                        //bitclock-inversion;
                        //frame-inversion;
                        /* master mode */
-                       bitclock-master = <&tdmb>;
-                       frame-master = <&tdmb>;
+                       //bitclock-master = <&tdmb>;
+                       //frame-master = <&tdmb>;
                        /* slave mode */
-                       //bitclock-master = <&tdmbcodec>;
-                       //frame-master = <&tdmbcodec>;
+                       bitclock-master = <&tdmbcodec>;
+                       frame-master = <&tdmbcodec>;
                        /* suffix-name, sync with android audio hal used for */
                        suffix-name = "alsaPORT-i2s-i2s4hdmirx";
                        cpu {
@@ -955,12 +955,12 @@
                                &clkc CLKID_MPLL1>;
                clock-names = "mclk", "mclk_pad", "clk_srcpll";
 
-//             pinctrl-names = "tdm_pins";
-//             pinctrl-0 = <&mclk_1_pins
-//                     &tdm_b_pins
-//                     &tdm_d2_pins
-//                     &tdm_d3_pins
-//                     &tdmb_clk_pins>;
+               pinctrl-names = "tdm_pins";
+               pinctrl-0 = <&mclk_1_pins
+                       &tdm_b_pins
+                       &tdm_d2_pins
+                       &tdm_d3_pins
+                       &tdmb_clk_pins>;
 
                /*
                 * 0: tdmout_a;

And follow the documentations to build & upgrade the kernel.

https://docs.khadas.com/products/sbc/vim4/development/linux/build-linux-kernel

https://docs.khadas.com/products/sbc/vim4/configurations/upgrade-linux-kernel

6

How can I change the frequency of MCLK I2S ,it’s not 256fs but higher 32Mhz , why?