drm/vc4: hdmi: Add a function to retrieve the CSC matrix
The CSC matrix to use depends on the output format, its range and the colorspace. Since we're going to add more colorspaces, let's move the CSC matrix retrieval to a function. Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com> Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de> Link: https://lore.kernel.org/r/20221207-rpi-hdmi-improvements-v3-7-bdd54f66884e@cerno.techSigned-off-by: Maxime Ripard <maxime@cerno.tech>
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