MX8 Display: Difference between revisions
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<!-- Set release according to "release" parameter in URL and use RELEASE_SUMO_V1.0_VAR-SOM-MX8X as default | <!-- Set release according to "release" parameter in URL and use RELEASE_SUMO_V1.0_VAR-SOM-MX8X as default | ||
--> {{# | --> {{INIT_RELEASE_PARAM|RELEASE_SUMO_V1.0_VAR-SOM-MX8X}} <!-- | ||
--> {{#lst: | --> {{#lst:Yocto_Platform_Customization|{{#var:RELEASE_PARAM}}}} <!-- | ||
--> {{PageHeader|{{#var:HARDWARE_NAME}} Display}} {{DocImage|category1=Yocto|category2={{#var:HARDWARE_NAME}} | --> {{#lst:Debian_Platform_Customization|{{#var:RELEASE_PARAM}}}} <!-- | ||
--> {{PageHeader|{{#var:HARDWARE_NAME}} Display}} {{DocImage|category1=Yocto|category2=Debian}} [[Category:{{#var:HARDWARE_NAME}}]] __toc__ | |||
{{#ifeq: {{#var:HARDWARE_NAME}}|VAR-SOM-MX8| | {{#ifeq: {{#var:HARDWARE_NAME}}|VAR-SOM-MX8| | ||
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Selecting display configuration is a matter of selecting an appropriate dtb file.<br> | Selecting display configuration is a matter of selecting an appropriate dtb file.<br> | ||
On VAR-SOM-MX8 /boot/ | On VAR-SOM-MX8 /boot/{{#var:DTB_PREFIX}}.dtb is a symbolic link to the active dtb file. By default it points to LVDS dtb.<br> | ||
To select HDMI display, run the following commands: | To select HDMI display, run the following commands: | ||
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# ln -fs {{#var:DTB_PREFIX_QP}}-dp.dtb {{#var:DTB_PREFIX_QP}}.dtb (For i.MX8QP SoC) | # ln -fs {{#var:DTB_PREFIX_QP}}-dp.dtb {{#var:DTB_PREFIX_QP}}.dtb (For i.MX8QP SoC) | ||
On SPEAR-MX8 /boot/ | On SPEAR-MX8 /boot/{{#var:DTB_PREFIX_SP8}}.dtb is a symbolic link to the active dtb file. By default it points to LVDS dtb.<br> | ||
To select HDMI display, run the following commands: | To select HDMI display, run the following commands: | ||
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</pre> | </pre> | ||
| | | | ||
On VAR-SOM-MX8 LVDS panel is configured in arch/arm64/boot/dts/freescale/ | On VAR-SOM-MX8 LVDS panel is configured in arch/arm64/boot/dts/freescale/{{#var:DTB_PREFIX}}-lvds.dtsi <br> | ||
On SPEAR-MX8 LVDS panel is configured in arch/arm64/boot/dts/freescale/ | On SPEAR-MX8 LVDS panel is configured in arch/arm64/boot/dts/freescale/{{#var:DTB_PREFIX_SP8}}-lvds.dtsi | ||
<pre> | <pre> | ||
&ldb1_phy { | &ldb1_phy { | ||
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# systemctl restart weston | # systemctl restart weston | ||
= Rotating the Weston display = | |||
{{WESTON_DISPLAY_ROTATE}} | |||
Latest revision as of 21:47, 26 September 2024
This page is using the default release RELEASE_SUMO_V1.0_VAR-SOM-MX8X.
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
LVDS
VAR-SOM-MX8X supports one dual-channel LVDS interface.
VAR-SOM-MX8X evaluation kit comes with two LVDS connectors, one connector per LVDS channel.
By default Variscite panel is attached to LVDS#A connector.
Adding custom LVDS panel
VAR-SOM-MX8X evaluation kit comes with 800x480 LVDS panel.
VAR-SOM-MX8X DTS file was created with this panel in mind.
To support different LVDS panel, several modifications may be required.
The following code configures LVDS panel in arch/arm64/boot/dts/freescale/fsl-imx8qxp-var-som-common.dtsi under kernel source tree:
&ldb1_phy {
status = "ok";
};
&ldb1 {
status = "ok";
lvds-channel@0 {
fsl,data-mapping = "jeida";
fsl,data-width = <24>;
status = "ok";
display-timings {
lvds {
clock-frequency = <29232000>;
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 may need to modify "fsl,data-mapping", "fsl,data-width" and "display-timings" properties to match your panel specification.
For more information see Documentation/devicetree/bindings/display/imx/ldb.txt in the kernel source tree.
Setting Weston Desktop Resolution
The default Weston uses maximum resolution supported by display.
To modify Weston resolution, edit /etc/xdg/weston/weston.ini and set size parameter in shell section.
For example:
[shell] size=3840x2160
For new settings to take effect restart weston by running
# systemctl restart weston
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
For more information, see the weston man pages: