drm: Introduce drm_color_lut_size()

Provide a small helper to convert the blob length in bytes
to the number of LUT entries.

v2: Add kerneldoc (Daniel)

Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20180315152338.7248-1-ville.syrjala@linux.intel.com
上级 d2a24edb
......@@ -38,6 +38,18 @@ void drm_crtc_enable_color_mgmt(struct drm_crtc *crtc,
int drm_mode_crtc_set_gamma_size(struct drm_crtc *crtc,
int gamma_size);
/**
* drm_color_lut_size - calculate the number of entries in the LUT
* @blob: blob containing the LUT
*
* Returns:
* The number of entries in the color LUT stored in @blob.
*/
static inline int drm_color_lut_size(const struct drm_property_blob *blob)
{
return blob->length / sizeof(struct drm_color_lut);
}
enum drm_color_encoding {
DRM_COLOR_YCBCR_BT601,
DRM_COLOR_YCBCR_BT709,
......
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