[PATCH 3/3] drm: add enum drm_hdr_metadata_eotf

[Simon Ser]

Avoids hardcoding magic numbers in user-space, and makes the docs
clearer.

Signed-off-by: Simon Ser <cont...@emersion.fr>
Cc: Harry Wentland <harry.wentl...@amd.com>
Cc: Daniel Vetter <dan...@ffwll.ch>
Cc: Sebastian Wick <sebastian.w...@redhat.com>
Cc: Joshua Ashton <jos...@froggi.es>
Cc: Pekka Paalanen <pekka.paala...@collabora.com>
---
 include/uapi/drm/drm_mode.h | 27 ++++++++++++++++++++++++++-
 1 file changed, 26 insertions(+), 1 deletion(-)

diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h
index c0c40dc9e2f1..eb2a38c73ae0 100644
--- a/include/uapi/drm/drm_mode.h
+++ b/include/uapi/drm/drm_mode.h
@@ -859,6 +859,31 @@ enum drm_hdr_metadata_type {
        DRM_HDR_STATIC_METADATA_TYPE1 = 0,
 };
 
+/**
+ * enum drm_hdr_metadata_eotf - Electro-Optical Transfer Function.
+ */
+enum drm_hdr_metadata_eotf {
+       /**
+        * @DRM_HDR_METADATA_EOTF_TRADITIONAL_GAMMA_SDR: traditional gamma, SDR
+        * luminance range.
+        */
+       DRM_HDR_METADATA_EOTF_TRADITIONAL_GAMMA_SDR = 0,
+       /**
+        * @DRM_HDR_METADATA_EOTF_TRADITIONAL_GAMMA_HDR: traditional gamma, HDR
+        * luminance range.
+        */
+       DRM_HDR_METADATA_EOTF_TRADITIONAL_GAMMA_HDR = 1,
+       /**
+        * @DRM_HDR_METADATA_EOTF_SMPTE_ST_2084: SMPTE ST 2084.
+        */
+       DRM_HDR_METADATA_EOTF_SMPTE_ST_2084 = 2,
+       /**
+        * @DRM_HDR_METADATA_EOTF_HLG_BT2100: Hybrid Log-Gamma (HLG) based on
+        * ITU-R BT.2100-0.
+        */
+       DRM_HDR_METADATA_EOTF_HLG_BT2100 = 3,
+};
+
 /**
  * struct hdr_metadata_infoframe - HDR Metadata Infoframe Data.
  *
@@ -871,7 +896,7 @@ enum drm_hdr_metadata_type {
 struct hdr_metadata_infoframe {
        /**
         * @eotf: Electro-Optical Transfer Function (EOTF)
-        * used in the stream.
+        * used in the stream. See enum drm_hdr_metadata_eotf.
         */
        __u8 eotf;
        /**
-- 
2.40.1