DRM database property: GAMMA_LUT

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Details

Name

GAMMA_LUT

Flags

<none>

Type

blob

Attached to

CRTC

Specification

<none>

Documentation

Blob property to set the gamma lookup table (LUT) mapping pixel data
after the transformation matrix to data sent to the connector. The
data is interpreted as an array of &struct drm_color_lut elements.
Hardware might choose not to use the full precision of the LUT elements
nor use all the elements of the LUT (for example the hardware might
choose to interpolate between LUT[0] and LUT[4]).

Setting this to NULL (blob property value set to 0) means a
linear/pass-thru gamma table should be used. This is generally the
driver boot-up state too. Drivers can access this blob through
&drm_crtc_state.gamma_lut.

Note that for mostly historical reasons stemming from Xorg heritage,
this is also used to store the color map (also sometimes color lut, CLUT
or color palette) for indexed formats like DRM_FORMAT_C8.

Driver support