DART-MX8M Android Display: Difference between revisions
(2 intermediate revisions by 2 users not shown) | |||
Line 9: | Line 9: | ||
# LVDS | # LVDS | ||
# HDMI - | # HDMI - Up to 4K@60fps | ||
# Display Port - | # Display Port - Up to 4K@60fps | ||
# DSI - Only available at skew | # DSI - Only available at skew | ||
Line 23: | Line 23: | ||
To configure specific resolution use u-boot prompt setenv command to set video= kernel command line argument.<br> | To configure specific resolution use u-boot prompt setenv command to set video= kernel command line argument.<br> | ||
For example, to set 1080p60 resolution on HDMI display, run the following command: | For example, to set 1080p60 resolution on HDMI display, run the following command: | ||
=> setenv | =>setenv bootargs 'init=/init firmware_class.path=/vendor/firmware loop.max_part=7 bootconfig androidboot.hardware=nxp androidboot.vendor.sysrq=1 transparent_hugepage=never video=HDMI-A-1:1920x1080-32@60 androidboot.gui_resolution=1080p | ||
=>saveenv | |||
To set 1080p60 resolution on DP display, run the following command: | To set 1080p60 resolution on DP display, run the following command: | ||
=> setenv | =>setenv hdp_file dpfw.bin | ||
=>setenv bootargs 'init=/init firmware_class.path=/vendor/firmware loop.max_part=7 bootconfig androidboot.hardware=nxp androidboot.vendor.sysrq=1 transparent_hugepage=never video=HDMI-A-1:1920x1080-32@60 androidboot.gui_resolution=1080p | |||
=>saveenv | |||
The settings will be effective after reboot. | The settings will be effective after reboot. | ||
}} | }} |
Latest revision as of 14:57, 5 September 2023
Setup
- VAR-SOM-MX6 supports The VAR-SOM-MX8/SPEAR-MX8 supports HDMI/DP/eDP, MIPI DSI and LVDS display interfaces.
- LVDS
- HDMI - Up to 4K@60fps
- Display Port - Up to 4K@60fps
- DSI - Only available at skew
Selecting display type
VAR-SOM-MX8 and SPEAR-MX8 support DP, HDMI and LVDS displays. To use DP and HDMI on VAR-SOM-MX8 carrier board one should attach Variscite extension boards VAR-EXT-DP and VAR-EXT-HDMI respectively.
Selecting display configuration is a matter of selecting an appropriate dtbo file.
Setting HDMI and DP resolution
By default the maximum resolution supported by HDMI/DP display is being used.
To configure specific resolution use u-boot prompt setenv command to set video= kernel command line argument.
For example, to set 1080p60 resolution on HDMI display, run the following command:
=>setenv bootargs 'init=/init firmware_class.path=/vendor/firmware loop.max_part=7 bootconfig androidboot.hardware=nxp androidboot.vendor.sysrq=1 transparent_hugepage=never video=HDMI-A-1:1920x1080-32@60 androidboot.gui_resolution=1080p =>saveenv
To set 1080p60 resolution on DP display, run the following command:
=>setenv hdp_file dpfw.bin =>setenv bootargs 'init=/init firmware_class.path=/vendor/firmware loop.max_part=7 bootconfig androidboot.hardware=nxp androidboot.vendor.sysrq=1 transparent_hugepage=never video=HDMI-A-1:1920x1080-32@60 androidboot.gui_resolution=1080p =>saveenv
The settings will be effective after reboot. }}
LVDS
VAR-SOM-MX6 supports one dual-channel LVDS interface.
VAR-SOM-MX6 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-MX6 evaluation kit comes with 800x480 LVDS panel.
VAR-SOM-MX6 DTS file was created with this panel in mind.
To support different LVDS panel, several modifications may be required.
On VAR-SOM-MX8 LVDS panel is configured in arch/arm64/boot/dts/freescale/-lvds.dtsi
On SPEAR-MX8 LVDS panel is configured in arch/arm64/boot/dts/freescale/-lvds.dtsi
&ldb1_phy { status = "okay"; }; &ldb1 { status = "okay"; lvds-channel@0 { fsl,data-mapping = "spwg"; fsl,data-width = <18>; status = "okay"; display-timings { lvds { clock-frequency = <35714000>; hactive = <800>; vactive = <480>; hback-porch = <39>; hfront-porch = <39>; vback-porch = <29>; vfront-porch = <13>; hsync-len = <47>; vsync-len = <2>; 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.