From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
BT.2020 specifies two YCbCr<->RGB conversion formulas. The more
traditional non-constant luminance and a more complicate constant
luminance one. Add an enum value for the constant luminance variant
as well in case someone has hardware supporting it.
v2: Reduce the enum name to fit within the 31 character uapi limit
Cc: Harry Wentland <harry.wentland@xxxxxxx>
Cc: Daniel Vetter <daniel@xxxxxxxx>
Cc: Daniel Stone <daniel@xxxxxxxxxxxxx>
Cc: Russell King - ARM Linux <linux@xxxxxxxxxxxxxxx>
Cc: Ilia Mirkin <imirkin@xxxxxxxxxxxx>
Cc: Hans Verkuil <hverkuil@xxxxxxxxx>
CC: Uma Shankar <uma.shankar@xxxxxxxxx>
Cc: Shashank Sharma <shashank.sharma@xxxxxxxxx>
Cc: Jyri Sarha <jsarha@xxxxxx>
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Acked-by: Harry Wentland <harry.wentland@xxxxxxx> #v1
---
drivers/gpu/drm/drm_color_mgmt.c | 1 +
include/drm/drm_color_mgmt.h | 3 ++-
2 files changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/drm_color_mgmt.c b/drivers/gpu/drm/drm_color_mgmt.c
index 4ff064623836..cc28c32399af 100644
--- a/drivers/gpu/drm/drm_color_mgmt.c
+++ b/drivers/gpu/drm/drm_color_mgmt.c
@@ -358,6 +358,7 @@ static const char * const color_encoding_name[] = {
[DRM_COLOR_YCBCR_BT601] = "ITU-R BT.601 YCbCr",
[DRM_COLOR_YCBCR_BT709] = "ITU-R BT.709 YCbCr",
[DRM_COLOR_YCBCR_BT2020] = "ITU-R BT.2020 YCbCr",
+ [DRM_COLOR_YCBCR_BT2020_CONST] = "ITU-R BT.2020 YCbCr const",
};
static const char * const color_range_name[] = {
diff --git a/include/drm/drm_color_mgmt.h b/include/drm/drm_color_mgmt.h
index b3b6d302ca8c..175943c87d5b 100644
--- a/include/drm/drm_color_mgmt.h
+++ b/include/drm/drm_color_mgmt.h
@@ -41,7 +41,8 @@ int drm_mode_crtc_set_gamma_size(struct drm_crtc *crtc,
enum drm_color_encoding {
DRM_COLOR_YCBCR_BT601,
DRM_COLOR_YCBCR_BT709,
- DRM_COLOR_YCBCR_BT2020,
+ DRM_COLOR_YCBCR_BT2020, /* non-constant luminance */
+ DRM_COLOR_YCBCR_BT2020_CONST, /* constant luminance */
DRM_COLOR_ENCODING_MAX,
};
--
2.13.6
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