iMX8QM : LVDS display error

Hyungj — Wed, 12 Jan 2022 01:21:20 GMT

I want to use 2 LVDS display with 2 channel.

So, I fix the imx8qm-XXXX.dts like below and compile it to imx8qm-XXXX.dtb with dtc in Linux

.....

lvds1_panel { /* LVDS1: LVDS panel */

compatible = "powertrip,ph128800t004-zhc";

backlight = <&lvds1_backlight>;

pinctrl-names = "default";

pinctrl-0 = <&pinctrl_lvds1>;

power-supply = <&reg_1p8v>;

enable-gpios = <&lsio_gpio5 0 GPIO_ACTIVE_HIGH>;

status = "okay";

port {

panel_lvds1_in: endpoint {

remote-endpoint = <&lvds1_out>;

};

...........

&ldb2 { /* LVDS1: LVDS Channel-0 Port Enable */

status = "okay";

fsl,dual-channel;

lvds-channel@0 {

fsl,data-mapping = "spwg";

fsl,data-width = <24>;

status = "okay";

port@1 {

reg = <1>;

lvds1_out: endpoint {

remote-endpoint = <&panel_lvds1_in>;

};

--------------------

Then, I move the file from Host pc to board[run/media/mmcblk0p1] and change the setup in U boot

-setenv fdt_file imx8qm-XXXX.dtb

-saveenv

-boot

After booting, I got a looped dmesg error :

[ 11.509961] imx-drm display-subsystem: failed to bind bus@57240000:ldb@572410e0 (ops imx8qm_ldb_ops): -517
[ 11.520191] imx-drm display-subsystem: master bind failed: -517
[ 11.527389] imx-sgtl5000 sound: ASoC: failed to init link HiFi: -517
[ 11.535857] nwl-dsi 56228000.dsi_host: [drm:nwl_dsi_host_attach] lanes=4, format=0x0 flags=0x15
[ 11.544794] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[ 11.551432] [drm] No driver support for vblank timestamp query.
[ 11.557433] imx-drm display-subsystem: bound imx-drm-dpu-bliteng.2 (ops dpu_bliteng_ops)
[ 11.565592] imx-drm display-subsystem: bound imx-drm-dpu-bliteng.5 (ops dpu_bliteng_ops)
[ 11.573815] imx-drm display-subsystem: bound imx-dpu-crtc.0 (ops dpu_crtc_ops)
[ 11.581155] imx-drm display-subsystem: bound imx-dpu-crtc.1 (ops dpu_crtc_ops)
[ 11.588498] imx-drm display-subsystem: bound imx-dpu-crtc.3 (ops dpu_crtc_ops)
[ 11.595835] imx-drm display-subsystem: bound imx-dpu-crtc.4 (ops dpu_crtc_ops)
[ 11.603480] imx-drm display-subsystem: bound 56228000.dsi_host (ops nwl_dsi_component_ops)

How can I fix it?

Re: iMX8QM : LVDS display error

joanxie — Tue, 18 Jan 2022 08:06:13 GMT

pls refer to the document as below:

https://community.nxp.com/t5/i-MX-Processors-Knowledge-Base/IMX8QM-LVDS-mirror-dual-mode-reference-patch/ta-p/1121478

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iMX8QM : LVDS display error

Re: iMX8QM : LVDS display error