DART-MX8M-MINI Display: Difference between revisions
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= Introduction = | = Introduction = | ||
== MIPI-DSI and LVDS == | == MIPI-DSI and LVDS == | ||
Revision as of 21:14, 27 April 2023
This page is using the default release RELEASE_SUMO_V1.0_DART-MX8M-MINI.
To view this page for a specific Variscite SoM and software release, please follow these steps:
- Visit variwiki.com
- Select your SoM
- Select the software release
[[Category:]]
Introduction
MIPI-DSI and LVDS
SoC supports MIPI-DSI interface. can be optionally equipped with SN65DSI84 MIPI-DSI to LVDS bridge.
carrier board comes with LVDS connectors, so you can easily connect LVDS display.
Connecting MIPI-DSI display to carrier board requires designing a custom connector.
Adding custom LVDS panel
evaluation kit comes with 800x480 LCD panel. DTS file was created with this panel in mind.
To support your custom LVDS panel, you should make several modifications
Referencing custom panel in the DTS file
The following code references Variscite panel in arch/arm64/boot/dts/freescale/ under kernel source tree
dsi_lvds_bridge: sn65dsi84@2c {
compatible = "ti,sn65dsi83";
reg = <0x2c>;
ti,dsi-lanes = <1>;
ti,lvds-format = <1>;
ti,lvds-bpp = <24>;
ti,width-mm = <154>;
ti,height-mm = <87>;
enable-gpios = <&gpio2 11 GPIO_ACTIVE_HIGH>;
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_lvds>;
status = "okay";
display-timings {
lvds {
clock-frequency = <33000000>;
hactive = <800>;
vactive = <480>;
hback-porch = <40>;
hfront-porch = <40>;
vback-porch = <29>;
vfront-porch = <13>;
hsync-len = <48>;
vsync-len = <3>;
hsync-active = <0>;
vsync-active = <0>;
de-active = <1>;
pixelclk-active = <0>;
};
};
...
};
You should modify the "ti,dsi-lanes", "ti,lvds-format", "ti,lvds-bpp", "ti,width-mm", "ti,height-mm" and "display-timings" properties to match your panel specification and rebuild the DTB file.
To support a dual channel LVDS panel, please add "ti,lvds-channels = <2>".
Rotating the Weston display
To rotate the Weston display, edit /etc/xdg/weston/weston.ini.
For example, rotate the display 90 degrees:
[output] name=DSI-1 transform=90