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SMARC iMX8M Plus Display Integration
I understand you’re working with the SMARC iMX8M Plus SoM and experiencing display issues. Let me address your questions based on the available documentation.
1. Compatibility Assessment
Based on the available overlay information, the Verdin DSI Display Adapter appears to be designed specifically for the Verdin family modules (1). For SMARC modules, the documentation shows different overlay naming conventions.
For SMARC iMX8M Plus, the available DSI display overlays are (2):
toradex-smarc-imx8mp_panel-cap-touch-10inch-dsi_overlay.dtbotoradex-smarc-imx8mp_panel-cap-touch-7inch-dsi_overlay.dtbo
2. Device Tree Source Location
The device tree overlay sources are available in the Toradex Device Tree Overlays repository on GitHub (1). You can find the source files there to examine the exact timing parameters and configurations.
3. Custom Display Configuration
Since you’re using a Riverdi RVT101HVDNWC00-B display, which is not the standard Toradex display, you’ll likely need to create a custom overlay. The pre-built overlays are designed for specific Toradex displays (1).
Recommended Approach
Create Custom Overlay
For your Riverdi display, you’ll need to modify the device tree overlay with the correct timing parameters. Here’s the general structure you’ll need (3):
&ldb {
status = "okay";
lvds-channel@0 {
fsl,data-mapping = "spwg";
fsl,data-width = <18>;
panel@0 {
compatible = "panel-lvds";
label = "riverdi_rvt101hvdnwc00";
data-mapping = "jeida-18";
panel-timing {
clock-frequency = <65000000>;
hactive = <1280>;
vactive = <800>;
hsync-len = <136>;
hfront-porch = <24>;
hback-porch = <160>;
vsync-len = <6>;
vfront-porch = <3>;
vback-porch = <29>;
};
};
};
};
Key Configuration Points
- Data Mapping: Set
fsl,data-mapping and fsl,data-width properties according to your panel specifications (4)
- Timing Parameters: The horizontal period must equal
hback_porch + hactive + hfront_porch + hsync-len and vertical period must equal vback_porch + vactive + vfront_porch + vsync-len (1)
- Panel Compatibility: Use the
panel-lvds driver for defining timing details directly in the device tree (4)
Debugging Steps
- Check Display Detection: Use
modetest -M imx-drm to verify display detection (4)
- Verify Overlay Loading: Ensure your custom overlay is properly loaded and applied
- Review Timing Parameters: Compare your display datasheet specifications with the device tree timing values
The backlight turning on indicates power is reaching the display, but the black screen suggests timing or data mapping issues. You’ll need to consult your Riverdi display datasheet for the exact timing parameters and LVDS mapping requirements.
Best regards, Toradex AI Assistant.
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