DESK-MX8M-L/Peripherals/LVDS
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| Issue Date | Notes | ||
| First DESK-MX8M-L release | |||
| DESK-MX8M-L-2.0.0 release | |||
| 2023/08/22 | DESK-MX8M-L-4.0.0 release | ||
Contents
Peripheral LVDS[edit | edit source]
Device tree configuration[edit | edit source]
ORCA SOM[edit | edit source]
Here below an example of device tree modification on standard DAVE's kit for the ORCA SOM:
Example of definition aboud LVDS to HDMI convert from imx8mp-mito8mplus-cb1008.dts
...
...
reg_lvds_en: regulator_lcd_3V3_en {
compatible = "regulator-fixed";
regulator-name = "lvds_enable";
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_lcd_3v3_enable>;
gpio = <&gpio1 6 GPIO_ACTIVE_HIGH>;
enable-active-high;
regulator-boot-on;
regulator-always-on;
};
reg_vccbkl_en: regulator_lcd_5V_en {
compatible = "regulator-fixed";
regulator-name = "vddbkl_enable";
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_lcd_5v_enable>;
gpio = <&gpio1 8 GPIO_ACTIVE_HIGH>;
enable-active-high;
regulator-boot-on;
regulator-always-on;
};
...
...
&i2c6 {
clock-frequency = <100000>;
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_i2c6>;
status = "okay";
lvds_bridge: lvds-to-hdmi-bridge@4c {
compatible = "ite,it6263";
reg = <0x4c>;
reset-gpios = <&gpio1 9 GPIO_ACTIVE_LOW>;
status = "okay";
port {
it6263_in: endpoint {
remote-endpoint = <&lvds0_out>;
};
};
};
};
...
...
&lcdif2 {
status = "okay";
};
...
...
&ldb {
status = "okay";
lvds-channel@0 {
fsl,data-mapping = "jeida";
fsl,data-width = <24>;
status = "okay";
port@1 {
reg = <1>;
lvds0_out: endpoint {
remote-endpoint = <&it6263_in>;
};
};
};
};
...
...
&ldb_phy {
status = "okay";
};
...
...
&iomuxc {
pinctrl_lcd_3v3_enable: lcd_3v3_en {
fsl,pins = <
MX8MP_IOMUXC_GPIO1_IO06__GPIO1_IO06 0x19
>;
};
pinctrl_lcd_5v_enable: lcd_5v_en {
fsl,pins = <
MX8MP_IOMUXC_GPIO1_IO08__GPIO1_IO08 0x19
>;
};
};
Accessing the peripheral[edit | edit source]
Linux messages at boot time[edit | edit source]
... ... [ 1.487645] [drm] Initialized vivante 1.0.0 20170808 for 40000000.mix_gpu_ml on minor 0 [ 2.443613] imx-drm display-subsystem: bound imx-lcdifv3-crtc.0 (ops lcdifv3_crtc_ops) [ 2.453352] imx-drm display-subsystem: bound imx-lcdifv3-crtc.1 (ops lcdifv3_crtc_ops) [ 2.461529] imx-drm display-subsystem: bound 32c00000.bus:ldb@32ec005c (ops imx8mp_ldb_ops) [ 2.469910] imx-drm display-subsystem: bound 32fd8000.hdmi (ops dw_hdmi_imx_ops) [ 2.477563] [drm] Initialized imx-drm 1.0.0 20120507 for display-subsystem on minor 1 [ 3.377095] imx-drm display-subsystem: [drm] fb0: imx-drmdrmfb frame buffer device ... ...
DRM access[edit | edit source]
DRM framework can be accessed using the modetest DRM utility.
root@desk-mx8mp:~# modetest -M imx-drm Encoders: id crtc type possible crtcs possible clones 37 33 LVDS 0x00000001 0x00000001 39 0 TMDS 0x00000002 0x00000002 Connectors: id encoder status name size (mm) modes encoders 38 37 connected HDMI-A-1 340x190 2 37 modes: index name refresh (Hz) hdisp hss hse htot vdisp vss vse vtot #0 1280x720 60.00 1280 1390 1430 1650 720 725 730 750 74250 flags: phsync, pvsync; type: driver #1 1280x720 50.00 1280 1720 1760 1980 720 725 730 750 74250 flags: phsync, pvsync; type: driver props: 1 EDID: flags: immutable blob blobs: value: 00ffffffffffff002074560100000000 141f010380221378fe6435a5544f9e27 125054bfea0061400101010101010101 010101010101021900a050d015203020 780059c21000001e000000fc00543038 30410a20202020202020000000ff0030 303030303030300a20202020000000fd 00304b545413010a20202020202001c9 020334f1461202030401132309070783 01000067030c001000384467d85dc401 448001681a00000109283ce6e50f0000 0600e200ff0000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000 000000000000000000000000000000ca 2 DPMS: flags: enum enums: On=0 Standby=1 Suspend=2 Off=3 value: 0 5 link-status: flags: enum enums: Good=0 Bad=1 value: 0 6 non-desktop: flags: immutable range values: 0 1 value: 0 4 TILE: flags: immutable blob blobs: value: 40 0 disconnected HDMI-A-2 0x0 0 39 props: 1 EDID: flags: immutable blob blobs: value: 2 DPMS: flags: enum enums: On=0 Standby=1 Suspend=2 Off=3 value: 0 5 link-status: flags: enum enums: Good=0 Bad=1 value: 0 6 non-desktop: flags: immutable range values: 0 1 value: 0 4 TILE: flags: immutable blob blobs: value: 41 max bpc: flags: range values: 8 16 value: 0 CRTCs: id fb pos size 33 46 (0,0) (1280x720) #0 1280x720 60.00 1280 1390 1430 1650 720 725 730 750 74250 flags: phsync, pvsync; type: driver props: 24 VRR_ENABLED: flags: range values: 0 1 value: 0 36 0 (0,0) (0x0) #0 nan 0 0 0 0 0 0 0 0 0 flags: ; type: props: 24 VRR_ENABLED: flags: range values: 0 1 value: 0 Planes: id crtc fb CRTC x,y x,y gamma size possible crtcs 31 33 46 0,0 0,0 0 0x00000001 formats: XR24 AR24 RG16 XB24 AB24 AR15 XR15 props: 8 type: flags: immutable enum enums: Overlay=0 Primary=1 Cursor=2 value: 1 32 zpos: flags: immutable range values: 0 0 value: 0 34 0 0 0,0 0,0 0 0x00000002 formats: XR24 AR24 RG16 XB24 AB24 AR15 XR15 props: 8 type: flags: immutable enum enums: Overlay=0 Primary=1 Cursor=2 value: 1 35 zpos: flags: immutable range values: 0 0 value: 0 Frame buffers: id size pitch root@desk-mx8mp:~#
Additional information[edit | edit source]
For some information on DRM/KMS framework, see the DRM-KMS kernel documentation.
