I haven't seen RockChip RK3288 kernel code for a quite long time but if HDMI detection part isn't in better shape than in 2015 then there is a big mess. For example after determining reciever capabilities they basically set different parameters. It is true especially for Deep Colour panels. In my understanding it was done to prevent sending 10bpc signal as if RK3288 HDMI interface had problem with this.
If you can provide me with HDMI registry file from your box I will check if they realy can support 10bit per channel now.
To do so execute this command:
cat /sys/kernel/debug/rockchip_hdmiv2/regs_ctrl > /mnt/HDMI_regs_10bit.txt
and then send me HDMI_regs_10bit.txt file.
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