MX8 Display: Difference between revisions
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# ln -fs {{#replace:{{#var:DTB_PREFIX}}|som|spear}} | # ln -fs {{#replace:{{#var:DTB_PREFIX}}|som|spear}}-dp.dtb {{#replace:{{#var:DTB_PREFIX}}|som|spear}}.dtb | ||
The change will be effective after reboot.<br> | The change will be effective after reboot.<br> |
Revision as of 09:10, 23 October 2022
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