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Reinstate "output format" DRM property, and add support on Pi0-3. #6133

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Reinstate "output format" DRM property, and add support on Pi0-3. #6133

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Commits on Apr 29, 2024

  1. drm/vc4: hdmi: Add property to allow manual config of RGB or YCbCr 

    Add a custom property "Output format" that allows the overriding
of the default colourspace choice in the way that the old
firmware hdmi_pixel_encoding property did. If the chosen format is not
supported, then it will still drop back to the older behaviour.

This won't be acceptable to upstream, but it adds back the missing
functionality of hdmi_pixel_encoding.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
    @6by9
    6by9 committed Apr 29, 2024
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  2. drm/vc4: Add YCbCr matrix for Pi0-3 HDMI output 

    Pi4 has had the conversion matrices to drive YCbCr 444 and 422
output for a while, however Pi0-3 hasn't.
YCbCr422 can't be supported by the hardware, but YCbCr 444 can be,
so add the CCM.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
    @6by9
    6by9 committed Apr 29, 2024
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