Difference between revisions of "DESK-MX6-L/Pheripherals/HDMI"
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Latest revision as of 17:01, 8 January 2024
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| History | |||
|---|---|---|---|
| Issue Date | Notes | ||
| First DESK-MX6-L release | |||
| DESK-MX6-L 3.0.0 release | |||
| 2023/04/11 | DESK-MX6-L 4.0.0 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 AXELLite SOM:
From imx6qdl-sbcx-revb-common.dtsi:
hdmi_edid: edid@50 {
compatible = "fsl,imx6-hdmi-i2c";
reg = <0x50>;
};
From imx6qdl-axelcommon.dtsi:
&hdmi_cec {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_hdmi_cec_2>;
status = "okay";
};
&hdmi_core {
ipu_id = <0>;
disp_id = <0>;
status = "okay";
};
&hdmi_video {
fsl,phy_reg_vlev = <0x0294>;
fsl,phy_reg_cksymtx = <0x800d>;
status = "okay";
};
&iomuxc {
...
...
hdmi_cec {
pinctrl_hdmi_cec_2: hdmicecgrp-2 {
fsl,pins = <
MX6QDL_PAD_KEY_ROW2__HDMI_TX_CEC_LINE 0x1f8b0
>;
};
};
...
...
};
Accessing the peripheral[edit | edit source]
For enabling the HDMI device, it is required to instantiate its framebuffer with the related configuration and changing the display ID of hdmi_core, for example, with a 1920x1080p60 display:
&mxcfb3 {
compatible = "fsl,mxc_sdc_fb";
disp_dev = "hdmi";
interface_pix_fmt = "RGB24";
mode_str ="1920x1080M@60";
default_bpp = <32>;
status = "okay";
};
&hdmi_core {
ipu_id = <0>;
disp_id = <1>;
status = "okay";
};
Linux messages at boot time[edit | edit source]
... ... [ 3.784909] mxc_hdmi 20e0000.hdmi_video: supply HDMI not found, using dummy regulator [ 4.098068] mxc_hdmi 20e0000.hdmi_video: Detected HDMI controller 0x13:0x1a:0xa0:0xc1 [ 4.110974] mxc_sdc_fb fb@2: registered mxc display driver hdmi ... ...
Additional information[edit | edit source]
HDMI framebuffer can be accessed through the standard /dev/fbX fb device.
The configured framebuffer can be checked using standard fbset utility:
root@desk-mx6:~# fbset -fb /dev/fb2
mode "1920x1080-60"
# D: 148.500 MHz, H: 67.500 kHz, V: 60.000 Hz
geometry 1920 1080 1920 1080 32
timings 6734 148 88 36 4 44 5
hsync high
vsync high
rgba 8/16,8/8,8/0,8/24
endmode
