topic Re: Interface MIPI-DSI to imx6 DualLite in i.MX Processors

Interface MIPI-DSI to imx6 DualLite

jigneshpatel — Sat, 06 Apr 2019 05:03:49 GMT

Hi,

I am trying to interface MIPI-DSI lcd panel with Imx6 Dual lite processor. attached LCD data sheet for reference.

In my default device tree LVDS and HDMI display is already configured and added for MIPI-DSI in dtsi as following:

"
mxcfb1: fb@0 {
   compatible = "fsl,mxc_sdc_fb";
   disp_dev = "mipi_dsi";
   interface_pix_fmt = "RGB24";
   mode_str ="TRULY-WVGA";
   default_bpp = <24>;
   int_clk = <0>;
   late_init = <0>;
   status = "okay";
};

&mipi_dsi {
   status = "okay";
   ipu_id = <0>;
   csi_id = <1>;
   v_channel = <0>;
   lanes = <2>;
   pinctrl-names = "default";
   lcd_panel = "TRULY-WVGA";
   pinctrl-0 = <&pinctrl_mipi_dsi_reset>;
};
"

I have successfully build it and install it. but i am getting following error on debug.

"
mxc_sdc_fb fb@0: get mxcfb of property fail
mxc_sdc_fb: probe of fb@0 failed with error -22
mxc_sdc_fb fb@1: Can't get fb option for mxcfb1!
"

As error shows issue is in driver probe and register.

Please help to write proper device probe for MIPI-DSI.

Thanks,

Jignesh Patel

Re: Interface MIPI-DSI to imx6 DualLite

igorpadykov — Sat, 06 Apr 2019 07:31:24 GMT

Hi Jignesh

one can try with nxp bsps (rebuilding all from scratch) as it uses different

names, for example : "dev_id , disp_id", v_channel used for mipi_csi

imx6qdl-sabresd.dtsi\dts\boot\arm\arch - linux-imx - i.MX Linux kernel

imx6dl.dtsi\dts\boot\arm\arch - linux-imx - i.MX Linux kernel

Best regards
igor
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Re: Interface MIPI-DSI to imx6 DualLite

jigneshpatel — Sat, 06 Apr 2019 13:38:37 GMT

Thanks igor for guiding,

Now I have changed my device tree as given link as below:

   mxcfb1:fb@0{
       compatible = "fsl,imx6q-mipi-dsi";
       disp_dev = "mipi_dsi";
       interface_pix_fmt = "RGB24";
       lcd_panel = "TRULY-WVGA";
       mode_str ="TRULY-WVGA";
       default_bpp = <24>;
       int_clk = <0>;
       lete_init = <0>;
       status = "okay";
   };

   &mipi_dsi {
       compatible = "fsl,imx6q-mipi-dsi";
       dev_id = <0>;
       disp_id = <1>;
       lcd_panel = "TRULY-WVGA";
       disp-power-on-supply = <&reg_mipi_dsi_pwr_on>;
       reset-gpios = <&gpio5 15 GPIO_ACTIVE_LOW>;
       reset-delay-us = <50000>;
       status = "okay";
   };

But still i am getting error:

    mxc_mipi_dsi 21e0000.mipi: i.MX MIPI DSI driver probed
   mxc_mipi_dsi fb@0: failed to read of property dev_id
   mxc_mipi_dsi: probe of fb@0 failed with error -22

Error is from mipi_dsi.c file.Why it gives the error of dev_id.

Is any other configuration is required for MIPI-DSI and mxcfb1?

Thanks,
Jignesh Patel

Re: Interface MIPI-DSI to imx6 DualLite

igorpadykov — Sun, 07 Apr 2019 22:51:39 GMT

Hi Jignesh

recommended to use nxp linux where these settings work fine

linux-imx - i.MX Linux kernel

Linux L4.14.78_1.0.0 Documentation

Best regards
igor

Re: Interface MIPI-DSI to imx6 DualLite

jigneshpatel — Tue, 09 Apr 2019 04:04:28 GMT

Thanks for guidance,

Finally my MIPI DSI driver and mxc_sdc_fb driver probed, now next is LCD integration.

Issue is boorargs, uboot has LVDS interface. After changing mipi_dsi in videoargs, driver is registered.

Thanks,

Jignesh Patel

Re: Interface MIPI-DSI to imx6 DualLite

jaymind — Thu, 13 Aug 2020 05:08:48 GMT

Hi Jignesh,

Can you please share your corrected bootargs/videoargs here?

Because I am also facing similar issue,

[ 0.405405] mxc_mipi_dsi fb@0: failed to read of property dev_id

After adding dev_id = <0>; and disp_id = <0>; both values in mxcfb1: fb@0 and &mipi_dsi both nodes another error is generating as below:

mxc_mipi_dsi fb@0: failed to get platform resource 0

My current dtsi node details:

mxcfb1: fb@0 {
compatible = "fsl,imx6q-mipi-dsi";
disp_dev = "mipi_dsi";
dev_id = <0>; //added new
disp_id = <0>; //added new, disp_id = <1>;
interface_pix_fmt = "RGB24";
lcd_panel = "TRULY-WVGA";
mode_str ="TRULY-WVGA";
default_bpp = <24>;
int_clk = <0>;
late_init = <0>;
status = "okay";
};

&mipi_dsi {
compatible = "fsl,imx6q-mipi-dsi";
dev_id = <0>;
disp_id = <1>;
lcd_panel = "TRULY-WVGA";
// disp-power-on-supply = <&reg_mipi_dsi_pwr_on>;
reset-gpios = <&gpio6 4 GPIO_ACTIVE_LOW>;
reset-delay-us = <50>;
status = "okay";
};

But, I am not sure whether I need to add dev_id and disp_id at both places or not?

Which another configuration in dtsi I am missing for correct LCD interface?

Please share your suggestions.

Do let me know if more information require.

Regards,

Jaymin

Re: Interface MIPI-DSI to imx6 DualLite

jigneshpatel — Wed, 23 Sep 2020 07:12:49 GMT

@jaymind,

It may the issue of compatible driver found by linux. syntax should be compatible = "fsl,mxc_sdc_fb";

in your case uboot args = " setenv bootargs ${bootargs} video=mxcfb0:dev=mipi_dsi; " in your config file.

Thanks,

Jignesh Patel