I started work on my proposal for better color handling in Linux display drivers: https://lkml.org/lkml/2021/5/12/764
Since the first read-only property is now implemented for amdgpu and i915 I wanted to collect some feedback, since the other two read-only properties will be quite similar, I hope.
I have already commited the first patch in this series independently as it fixes a function already in use.
The actuall update of the values is implemented in patch three and four in the atomic_commit_tail() function of amdgpu and i915 respectifly. It does get updated more often than needed with the current approach, but without harm since just the same value is written again. A check if the update is required would be the same amount of computation. Let me know if you know a better place to put the update than attomic_commit_tail().