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drm/uAPI: Add "active bpc" as feedback channel for "max bpc" drm prop…
…erty Add a new general drm property "active bpc" which can be used by graphic drivers to report the applied bit depth per pixel color back to userspace. While "max bpc" can be used to change the color depth, there was no way to check which one actually got used. While in theory the driver chooses the best/highest color depth within the max bpc setting a user might not be fully aware what his hardware is or isn't capable off. This is meant as a quick way to double check the setup. In the future, automatic color calibration for screens might also depend on this information being available. Signed-off-by: Werner Sembach <wse@tuxedocomputers.com>
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