RockPi 4C - HDMI issues

#1

Hi,

I finally have time to dig at this issue before buying any more things, using any images on emmc (Radxa Debian (Single/Dual Screen), Armbian, my own Debian with custom kernel), I can’t get any EDID data out of my rockpi 4C on TV sets (Sony TV and Samsung and get at boot a messy resolution I can workaround with xrandr…)… using any other devices on same HDMI port, there’s no issue getting EDID data.

Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192
HDMI-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
   1280x720      60.00 +  50.00  
   1920x1080     60.00*   50.00  
   720x576       50.00  
   720x480       59.94  
DP-1 disconnected (normal left inverted right x axis y axis)

Is it possible that those products are incompatible with it ?

root@rockpi4c:~# uname -r
4.4.154-113-rockchip-gdb9dfc2cdd25

root@rockpi4c:~# dmesg |grep hdmi
[    2.768899] vcca1v8_hdmi: 1800 mV 
[    2.776420] vcca0v9_hdmi: 900 mV 
[    2.910103] extcon-pd-virtual virtual-pd0: GPIO lookup for consumer hdmi-5v
[    2.910118] of_get_named_gpiod_flags: can't parse 'hdmi-5v-gpios' property of node '/virtual-pd0[0]'
[    2.910125] of_get_named_gpiod_flags: can't parse 'hdmi-5v-gpio' property of node '/virtual-pd0[0]'
[    2.910140] extcon-pd-virtual virtual-pd0: lookup for GPIO hdmi-5v failed
[    3.173844] i2c i2c-9: of_i2c: modalias failure on /hdmi@ff940000/ports
[    3.174506] dwhdmi-rockchip ff940000.hdmi: registered DesignWare HDMI I2C bus driver
[    3.175546] dwhdmi-rockchip ff940000.hdmi: Detected HDMI TX controller v2.11a with HDCP (DWC HDMI 2.0 TX PHY)
[    3.180614] rockchip-drm display-subsystem: bound ff940000.hdmi (ops 0xffffff8008d51f80)
[    3.218626] dwhdmi-rockchip ff940000.hdmi: failed to get edid
[    4.299057] of_get_named_gpiod_flags: can't parse 'simple-audio-card,hp-det-gpio' property of node '/hdmi-codec[0]'
[    4.299085] of_get_named_gpiod_flags: can't parse 'simple-audio-card,mic-det-gpio' property of node '/hdmi-codec[0]'
[    4.300180] asoc-simple-card hdmi-codec: i2s-hifi <-> ff8a0000.i2s mapping ok
[    9.300289] dwhdmi-rockchip ff940000.hdmi: failed to get edid
[   11.821364] dwhdmi-rockchip ff940000.hdmi: failed to get edid
[   11.852673] [drm:dw_hdmi_rockchip_set_property] *ERROR* failed to set rockchip hdmi connector property
[   11.853637] [drm:dw_hdmi_rockchip_set_property] *ERROR* failed to set rockchip hdmi connector property
[   11.854501] [drm:dw_hdmi_rockchip_set_property] *ERROR* failed to set rockchip hdmi connector property
[   11.855361] [drm:dw_hdmi_rockchip_set_property] *ERROR* failed to set rockchip hdmi connector property
[   11.856295] [drm:dw_hdmi_rockchip_set_property] *ERROR* failed to set rockchip hdmi connector property
[   11.857274] [drm:dw_hdmi_rockchip_set_property] *ERROR* failed to set rockchip hdmi connector property
[   14.165257] dwhdmi-rockchip ff940000.hdmi: failed to get edid

Apart from that, everything works… Thanks for your time in advance and feel free to comment if you have any ideas :slight_smile:

Alex

#2

Can you try other HDMI monitor/TV? If you tried HDMI from three different brands, still EDID error. It’s mostly like to be the hardware issue. Might be the issue of the 5V to 3.3V I2C level shifter.

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#3

thanks @jack, well made more tests on different display, same issue, I’ll now wait on the Rock 5B to come to order again :slight_smile:

#4

I’m considering the Rockpi 4 as a platform for a media pc. So I want to ask if there is an identified issue with that level shifter? From a hardware point of view I cannot see an issue with this part in I2c lines. However, as I have not found any discrete pull-ups in the I2c lines the bus might not function if pull ups in the pinmux are not enabled.
Are the pull ups enabled in the pinmux?

Best regards, Martin.

#5

the i2c is internal pull-up inside the soc.