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DESK-MX8M-L/Peripherals/LVDS

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U0007 moved page DESK-MX8M-L/Pheripherals/LVDS to DESK-MX8M-L/Peripherals/LVDS without leaving a redirect
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<section begin=Body/>
==Peripheral LVDS ==
=== Device tree configuration ===
 
==== ORCA SOM ====
 
Here below an example of device tree modification on standard DAVE's kit for the ORCA SOM:
From Example of definition aboud LVDS to HDMI convert from <code>imx8mp-mito8mplus-cb1008.dts</code>
<pre>
...
...
reg_lvds_en: regulator_lcd_3V3_en {
compatible = "regulator-fixed";
};
...
...
reg_vccbkl_en: regulator_lcd_5V_en {
compatible = "regulator-fixed";
regulator-always-on;
};
};
...
...
</pre>
===Accessing the peripheral===
====Linux messages at boot time====
...
...
[ 21.283274487645] [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.[ 2.608611443613] 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)[ 3.329236453352] 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)[ 3.345269461529] imx-drm display-subsystem: bound 32c00000.bus:ldb@32ec005c (ops imx8mp_ldb_ops)[ 32.375041469910] imx-drm display-subsystem: bound 32fd8000.hdmi (ops dw_hdmi_imx_ops)[ 32.383378477563] [drm] Initialized imx-drm 1.0.0 20120507 for display-subsystem on minor 1[ 3.673870377095] imx-drm display-subsystem: [drm] fb0: imx-drmdrmfb frame buffer device 
...
...
<pre class="workstation-terminal">
root@desk-mx8mp:~# modetesttrying to open device 'i915'...failedtrying to open device 'amdgpu'...failedtrying to open device 'radeon'...failedtrying to open device 'nouveau'...failedtrying to open device 'vmwgfx'...failedtrying to open device 'omapdrm'...failedtrying to open device 'exynos'...failedtrying to open device 'tilcdc'...failedtrying to open device 'msm'...failedtrying to open device 'sti'...failedtrying to open device 'tegra'...failedtrying to open device '-M imx-drm'...done
Encoders:
id crtc type possible crtcs possible clones40 36 37 33 LVDS 0x00000002 0xffffffff0x00000001 0x0000000141 39 0 TMDS 0x00000004 0x000000000x00000002 0x00000002
Connectors:
id encoder status name size (mm) modes encoders42 40 38 37 connected LVDSHDMI-A-1 154x90 1 40 340x190 2 37
modes:
index name refresh (Hz) hdisp hss hse htot vdisp vss vse vtot) #0 1024x600 591280x720 60.99 1024 1184 1188 1344 600 617 618 635 51200 00 1280 1390 1430 1650 720 725 730 750 74250 flags: phsync, pvsync; type: preferreddriver #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:43 40 0 disconnected HDMI-A-1 2 0x0 0 4139
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 size33 0 46 (0,0) (0x01280x720) #0 nan 0 0 0 0 0 0 0 0 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: 036 47 0 (0,0) (1024x6000x0) #0 1024x600 59.99 1024 1184 1188 1344 600 617 618 635 51200 nan 0 0 0 0 0 0 0 0 0 flags: ; type: preferred, driver
props:
24 VRR_ENABLED: flags: range values: 0 1 value: 039 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 crtcs31 0 0 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: 034 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 32 zpos: flags: immutable range values: 0 0 value: 037 34 0 0 0,0 0,0 0 0x00000004 0x00000002
formats: XR24 AR24 RG16 XB24 AB24 AR15 XR15
props:
8 type: flags: immutable enum enums: Overlay=0 Primary=1 Cursor=2 value: 1 38 35 zpos: flags: immutable range values: 0 0 value: 0
Frame buffers:
id size pitch
root@desk-mx8mp:~#
=== Additional information ===
For some information on DRM/KMS framework, see the [https://wikiwww.stkernel.comorg/stm32mpudoc/wikihtml/DRM_KMS_overview STM v5.1/gpu/drm-kms.html DRM overview-KMS] presentationkernel documentation.
----
[[Category:ORCA]]
U0007
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