DESK-MX8M-L/Peripherals/HDMI

History
ID#	Issue Date	Notes
15759	17/02/2022	First DESK-MX8M-L release
17553	24/02/2023	DESK-MX8M-L-2.0.0 release
17553	26/07/2023	DESK-MX8M-L-4.0.0 release

Peripheral HDMI

Device tree configuration

ORCA SOM

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";
};

&hdmi_blk_ctrl {
	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

Linux messages at boot time

...
...
[    0.336013] platform 32fd8000.hdmi: Fixing up cyclic dependency with 32fc6000.lcd-controller
[    2.352266] dwhdmi-imx 32fd8000.hdmi: Detected HDMI TX controller v2.13a with HDCP (samsung_dw_hdmi_phy2)
[    2.352931] dwhdmi-imx 32fd8000.hdmi: registered DesignWare HDMI I2C bus driver
[    2.414060] imx-drm display-subsystem: bound 32fd8000.hdmi (ops dw_hdmi_imx_ops)
...
...

Additional information

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	
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:~#

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 Jul 26 05:52 /dev/dri/card0
crw-rw---- 1 root video 226, 1 Jul 26 05:52 /dev/dri/card1
root@desk-mx8mp:~#

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