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Blob property to set the current transformation matrix (CTM) apply to pixel data after the lookup through the degamma LUT and before the lookup through the gamma LUT. The data is interpreted as a struct &drm_color_ctm. Setting this to NULL (blob property value set to 0) means a unit/pass-thru matrix should be used. This is generally the driver boot-up state too. Drivers can access the blob for the color conversion matrix through &drm_crtc_state.ctm.