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Enable HDCP on HDMI output from command line

Moderators: chensy, FATechsupport


I'm trying to enable HDCP for the HDMI output of the NanoPI M4 from the command line but can't figure out how.
I am running the FreindlyDesktop Bionic build (image file rk3399-sd-friendlydesktop-bionic-4.4-arm64-20190926.img).

I believe it should be supported as it's listed in the hardware specs and dmesg shows the driver supports it to some extent:

Code: Select all

pi@NanoPi-M4:~$ dmesg | grep -i hdcp
[    1.984592] dwhdmi-rockchip ff940000.hdmi: Detected HDMI TX controller v2.11a with HDCP (DWC HDMI 2.0 TX PHY)

sysfs has a content_protection node for the HDMI output but it reads empty and return Invalid Argument when writing what i think are sensible values to it:

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root@NanoPi-M4:/sys/devices/platform/display-subsystem/drm/card0/card0-HDMI-A-1# cat content_protection
root@NanoPi-M4:/sys/devices/platform/display-subsystem/drm/card0/card0-HDMI-A-1# echo -n "Desired" > content_protection
bash: echo: write error: Invalid argument

doing xrandr --prop doesn't list any content_protection property for th DMI interface (it does for the DP-1 interface though!)

Code: Select all

pi@NanoPi-M4:/sys/class/drm/card0-HDMI-A-1$ xrandr --prop
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192
eDP-1 disconnected primary (normal left inverted right x axis y axis)
        hue: 50
                range: (0, 100)
        saturation: 50
                range: (0, 100)
        contrast: 50
                range: (0, 100)
        brightness: 50
                range: (0, 100)
HDMI-1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 1152mm x 648mm
        hue: 50
                range: (0, 100)
        saturation: 50
                range: (0, 100)
        contrast: 50
                range: (0, 100)
        brightness: 50
                range: (0, 100)
        hdmi_quant_range: default
                supported: default, limit, full
        hdmi_output_mode_capacity: 7
                range: (0, 15)
        hdmi_color_depth_capacity: 19
                range: (0, 255)
        hdmi_output_colorimetry: None
                supported: None, ITU_2020
        hdmi_output_format: output_rgb
                supported: output_rgb, output_ycbcr444, output_ycbcr422, output_ycbcr420, output_ycbcr_high_subsampling, output_ycbcr_low_subsampling, invalid_output
        hdmi_output_depth: 24bit
                supported: Automatic, 24bit, 30bit
   1920x1080     60.00*
   1920x1080i    59.08
   1680x1050     59.88
   1280x1024     75.02    60.02
   1440x900      74.98    59.90
   1280x960      60.00
   1152x864      75.00
   1280x720      60.00    59.94
   1024x768      75.03    70.07    60.00
   1024x768i     86.96
   832x624       74.55
   800x600       72.19    75.00    60.32    56.25
   640x480       75.00    72.81    66.67    60.00    59.94
   720x400       87.85    70.08
DP-1 disconnected (normal left inverted right x axis y axis)
        hue: 50
                range: (0, 100)
        saturation: 50
                range: (0, 100)
        contrast: 50
                range: (0, 100)
        brightness: 50
                range: (0, 100)
        Content Protection: Undesired
                supported: Undesired, Desired, Enabled

I'm at a loss as for what to try next.
Is HDCP supported in this manner? How can I go about enabling it?

I would take the C-B apart and drill holes in the cover if not for the warning about voiding the “waranty”. Once that time period has expired, I will be sure to modify the case and innards.
Kodi Lucky Patcher nox
Please check if your cable is HDCP compliant at hdmi.org. You can do a quick search of the brand of the cable or look for tags/stickers on your cable that say 'HDCP compliant. ' You can also check the packaging that your cable was packaged in.

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