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drm: Introduce drm_color_lut_size()

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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: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20180315152338.7248-1-ville.syrjala@linux.intel.com
This commit is contained in:
Ville Syrjälä 2018-03-15 17:23:38 +02:00
parent d2a24edb53
commit 41204dfeed
1 changed files with 12 additions and 0 deletions
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12
include/drm/drm_color_mgmt.h
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@ -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,