DESK-MX8M-L/Peripherals/HDMI
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| Version | Issue Date | Notes | |
| 1.0.0 | Jan 2022 | First DESK-MX8M release | |
Contents
Peripheral HDMI[edit | edit source]
Device tree configuration[edit | edit source]
Here below an example of device tree configuration used on standard DAVE's kit for the ORCA SOM:
From imx8mp-mito8mplus-cb1001.dts:
sound-hdmi {
compatible = "fsl,imx-audio-cdnhdmi";
model = "audio-hdmi";
audio-cpu = <&aud2htx>;
hdmi-out;
constraint-rate = <44100>,
<88200>,
<176400>,
<32000>,
<48000>,
<96000>,
<192000>;
status = "okay";
};
...
...
&irqsteer_hdmi {
status = "okay";
};
&hdmimix_clk {
status = "okay";
};
&hdmimix_reset {
status = "okay";
};
&hdmi_pavi {
status = "okay";
};
&hdmi {
status = "okay";
};
&hdmiphy {
status = "okay";
};
From imx8mp-mito8mplus.dtsi:
&iomuxc {
...
...
pinctrl_hog: hoggrp {
fsl,pins = <
MX8MP_IOMUXC_HDMI_DDC_SCL__HDMIMIX_HDMI_SCL 0x400001c3
MX8MP_IOMUXC_HDMI_DDC_SDA__HDMIMIX_HDMI_SDA 0x400001c3
MX8MP_IOMUXC_HDMI_HPD__HDMIMIX_HDMI_HPD 0x40000019
MX8MP_IOMUXC_HDMI_CEC__HDMIMIX_HDMI_CEC 0x40000019
>;
};
...
...
};
Accessing the peripheral[edit | edit source]
Linux messages at boot time[edit | edit source]
... ... [ 0.816872] imx-hdmi-pavi 32fc4000.hdmi-pai-pvi: No pvi clock get [ 2.514179] dwhdmi-imx 32fd8000.hdmi: Detected HDMI TX controller v2.13a with HDCP (samsung_dw_hdmi_phy2) [ 2.524804] dwhdmi-imx 32fd8000.hdmi: registered DesignWare HDMI I2C bus driver [ 2.533924] imx-drm display-subsystem: bound 32fd8000.hdmi (ops dw_hdmi_imx_ops) [ 2.807834] debugfs: Directory '30cb0000.aud2htx' with parent 'audio-hdmi' already present! [ 2.816295] imx-cdnhdmi sound-hdmi: i2s-hifi <-> 30cb0000.aud2htx mapping ok [ 2.823380] imx-cdnhdmi sound-hdmi: ASoC: no DMI vendor name! [ 2.830004] input: audio-hdmi HDMI Jack as /devices/platform/sound-hdmi/sound/card0/input1 [ 2.897988] #0: audio-hdmi ... ...
Additional information[edit | edit source]
HDMI framebuffer can be accessed through the modetest utility accessing the imx-drm DRM device for NXP i.MX SoCs.
Here below an example of SBC ORCA configured for HDMI and LVDS outputs:
root@desk-mx8mp:~# modetest -M imx-drm
Encoders:
id crtc type possible crtcs possible clones
40 36 LVDS 0x00000002 0xffffffff
41 39 TMDS 0x00000004 0x00000000
Connectors:
id encoder status name size (mm) modes encoders
42 40 connected LVDS-1 217x136 1 40
modes:
index name refresh (Hz) hdisp hss hse htot vdisp vss vse vtot)
#0 1280x800 60.01 1280 1399 1431 1452 800 804 824 832 72500 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 41 connected HDMI-A-1 480x270 20 41
modes:
index name refresh (Hz) hdisp hss hse htot vdisp vss vse vtot)
#0 1920x1080 60.00 1920 2008 2052 2200 1080 1084 1089 1125 148500 flags: phsync, pvsync; type: preferred, driver
#1 1920x1080 59.94 1920 2008 2052 2200 1080 1084 1089 1125 148352 flags: phsync, pvsync; type: driver
#2 1920x1080 50.00 1920 2448 2492 2640 1080 1084 1089 1125 148500 flags: phsync, pvsync; type: driver
#3 1280x1024 75.02 1280 1296 1440 1688 1024 1025 1028 1066 135000 flags: phsync, pvsync; type: driver
#4 1280x1024 60.02 1280 1328 1440 1688 1024 1025 1028 1066 108000 flags: phsync, pvsync; type: driver
#5 1280x960 60.00 1280 1376 1488 1800 960 961 964 1000 108000 flags: phsync, pvsync; type: driver
#6 1152x864 75.00 1152 1216 1344 1600 864 865 868 900 108000 flags: phsync, pvsync; type: driver
#7 1280x720 60.00 1280 1390 1430 1650 720 725 730 750 74250 flags: phsync, pvsync; type: driver
#8 1280x720 59.94 1280 1390 1430 1650 720 725 730 750 74176 flags: phsync, pvsync; type: driver
#9 1280x720 50.00 1280 1720 1760 1980 720 725 730 750 74250 flags: phsync, pvsync; type: driver
#10 1440x576 50.00 1440 1464 1592 1728 576 581 586 625 54000 flags: nhsync, nvsync; type: driver
#11 1440x480 60.00 1440 1472 1596 1716 480 489 495 525 54054 flags: nhsync, nvsync; type: driver
#12 1440x480 59.94 1440 1472 1596 1716 480 489 495 525 54000 flags: nhsync, nvsync; type: driver
#13 800x600 60.32 800 840 968 1056 600 601 605 628 40000 flags: phsync, pvsync; type: driver
#14 800x600 56.25 800 824 896 1024 600 601 603 625 36000 flags: phsync, pvsync; type: driver
#15 720x576 50.00 720 732 796 864 576 581 586 625 27000 flags: nhsync, nvsync; type: driver
#16 720x480 60.00 720 736 798 858 480 489 495 525 27027 flags: nhsync, nvsync; type: driver
#17 720x480 59.94 720 736 798 858 480 489 495 525 27000 flags: nhsync, nvsync; type: driver
#18 640x480 60.00 640 656 752 800 480 490 492 525 25200 flags: nhsync, nvsync; type: driver
#19 640x480 59.94 640 656 752 800 480 490 492 525 25175 flags: nhsync, nvsync; type: driver
props:
1 EDID:
flags: immutable blob
blobs:
value:
00ffffffffffff000469c322725c0300
1a1e010380301b782a84d5a25a52a226
0d5054bfef00d1c0b300950081808140
81c0714f0101023a801871382d40582c
4500dc0c1100001e000000ff004c364c
4d54463232303237340a000000fd0032
4b185311000a202020202020000000fc
00415355532056503232380a20200170
020322714f0102031112130414050e0f
1d1e1f90230917078301000065030c00
10008c0ad08a20e02d10103e9600dc0c
11000018011d007251d01e206e285500
dc0c1100001e011d00bc52d01e20b828
5540dc0c1100001e8c0ad09020403120
0c405500dc0c11000018000000000000
00000000000000000000000000000035
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 44 (0,0) (1280x800)
#0 1280x800 60.01 1280 1399 1431 1452 800 804 824 832 72500 flags: ; type: preferred, driver
props:
24 VRR_ENABLED:
flags: range
values: 0 1
value: 0
39 50 (0,0) (1920x1080)
#0 1920x1080 60.00 1920 2008 2052 2200 1080 1084 1089 1125 148500 flags: phsync, pvsync; type: preferred, driver
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 44 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 39 50 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:~#
The connectors DRM names are: HDMI-A-1 and LVDS-1. The releated device card is:
root@desk-mx8mp:~# ls -la /dev/dri/card* crw-rw---- 1 root video 226, 0 Jan 14 16:10 /dev/dri/card0 crw-rw---- 1 root video 226, 1 Jan 14 16:10 /dev/dri/card1 root@desk-mx8mp:~#
