DESK-MX8M-L/Peripherals/LVDS
< DESK-MX8M-L
Revision as of 15:59, 30 December 2021 by U0007 (talk | contribs) (Created page with "<section begin=History/> {| style="border-collapse:collapse; " !colspan="4" style="width:100%; text-align:left"; border-bottom:solid 2px #ededed"|History |- !style="border-le...")
| HOME | SOMs | SBCs | ToloMEO Embedded Assistant |  GET A QUOTE
|
 ONLINE HELPDESK
|
| Roadmap | IoT Services | ML/AI services | Embedded Design Services |
| History | |||
|---|---|---|---|
| Version | Issue Date | Notes | |
| 1.0.0 | Jan 2022 | First DESK-MX8M release | |
Contents
Peripheral LVDS[edit | edit source]
Device tree configuration[edit | edit source]
Here below an example of device tree modification on standard DAVE's kit for the ORCA SOM:
From imx8mp-mito8mplus-cb1001.dts
reg_lvds_en: regulator-lvds-en {
compatible = "regulator-fixed";
regulator-name = "lvds_enable";
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_lvds_enable>;
gpio = <&gpio4 31 GPIO_ACTIVE_HIGH>;
enable-active-high;
};
panel0: lvds0_panel {
compatible = "avic,tm070ddh03";
power-supply = <®_lvds_en>;
backlight = <&lvds_backlight>;
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_panel_enable>;
enable-gpios = <&gpio4 1 GPIO_ACTIVE_HIGH>, <&gpio4 2 GPIO_ACTIVE_HIGH>;
port {
panel_lvds_in: endpoint {
remote-endpoint = <&lvds_out>;
};
};
};
...
...
&ldb {
status = "okay";
lvds-channel@0 {
fsl,data-mapping = "spwg";
fsl,data-width = <24>;
status = "okay";
port@1 {
reg = <1>;
lvds_out: endpoint {
remote-endpoint = <&panel_lvds_in>;
};
};
};
};
&ldb_phy {
status = "okay";
};
...
...
&iomuxc {
...
...
pinctrl_panel_enable: panelgrp {
fsl,pins = <
MX8MP_IOMUXC_SAI1_RXC__GPIO4_IO01 0x19
MX8MP_IOMUXC_SAI1_RXD0__GPIO4_IO02 0x19
>;
};
pinctrl_lvds_enable: lvds_en {
fsl,pins = <
MX8MP_IOMUXC_SAI3_TXFS__GPIO4_IO31 0x19
>;
};
pinctrl_vddbkl_enable: vddbkl_en {
fsl,pins = <
MX8MP_IOMUXC_GPIO1_IO08__GPIO1_IO08 0x19
>;
};
pinctrl_bkl_enable: bkl_en {
fsl,pins = <
MX8MP_IOMUXC_GPIO1_IO09__GPIO1_IO09 0x19
>;
};
};
Accessing the peripheral[edit | edit source]
Linux messages at boot time[edit | edit source]
... ... [ 2.283274] [drm] Initialized vivante 1.0.0 20170808 for 40000000.mix_gpu_ml on minor 0 [ 2.597328] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013). [ 2.608536] [drm] No driver support for vblank timestamp query. [ 2.608611] imx-drm display-subsystem: bound imx-lcdifv3-crtc.0 (ops lcdifv3_crtc_ops) [ 2.620086] imx-drm display-subsystem: bound imx-lcdifv3-crtc.1 (ops lcdifv3_crtc_ops) [ 2.634281] imx-drm display-subsystem: bound imx-lcdifv3-crtc.2 (ops lcdifv3_crtc_ops) [ 3.308628] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013). [ 3.315303] [drm] No driver support for vblank timestamp query. [ 3.321287] imx-drm display-subsystem: bound imx-lcdifv3-crtc.0 (ops lcdifv3_crtc_ops) [ 3.329236] imx-drm display-subsystem: bound imx-lcdifv3-crtc.1 (ops lcdifv3_crtc_ops) [ 3.337202] imx-drm display-subsystem: bound imx-lcdifv3-crtc.2 (ops lcdifv3_crtc_ops) [ 3.345269] imx-drm display-subsystem: bound 32c00000.bus:ldb@32ec005c (ops imx8mp_ldb_ops) [ 3.375041] imx-drm display-subsystem: bound 32fd8000.hdmi (ops dw_hdmi_imx_ops) [ 3.383378] [drm] Initialized imx-drm 1.0.0 20120507 for display-subsystem on minor 1 [ 3.673870] imx-drm display-subsystem: 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
trying to open device 'i915'...failed
trying to open device 'amdgpu'...failed
trying to open device 'radeon'...failed
trying to open device 'nouveau'...failed
trying to open device 'vmwgfx'...failed
trying to open device 'omapdrm'...failed
trying to open device 'exynos'...failed
trying to open device 'tilcdc'...failed
trying to open device 'msm'...failed
trying to open device 'sti'...failed
trying to open device 'tegra'...failed
trying to open device 'imx-drm'...done
Encoders:
id crtc type possible crtcs possible clones
40 36 LVDS 0x00000002 0xffffffff
41 0 TMDS 0x00000004 0x00000000
Connectors:
id encoder status name size (mm) modes encoders
42 40 connected LVDS-1 154x90 1 40
modes:
index name refresh (Hz) hdisp hss hse htot vdisp vss vse vtot)
#0 1024x600 59.99 1024 1184 1188 1344 600 617 618 635 51200 flags: ; type: preferred, driver
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:
43 0 disconnected HDMI-A-1 0x0 0 41
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:
CRTCs:
id fb pos size
33 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
36 47 (0,0) (1024x600)
#0 1024x600 59.99 1024 1184 1188 1344 600 617 618 635 51200 flags: ; type: preferred, driver
props:
24 VRR_ENABLED:
flags: range
values: 0 1
value: 0
39 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 0 0 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 36 47 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
37 0 0 0,0 0,0 0 0x00000004
formats: XR24 AR24 RG16 XB24 AB24 AR15 XR15
props:
8 type:
flags: immutable enum
enums: Overlay=0 Primary=1 Cursor=2
value: 1
38 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 STM DRM overview presentation.
