Existing LUT precision structure is having only 16 bit precision. This is not enough for upcoming enhanced hardwares and advance usecases like HDR processing. Hence added a new structure with 32 bit precision values.
This also defines a new structure to define color lut ranges, along with related macro definitions and enums. This will help describe multi segmented lut ranges in the hardware.
Signed-off-by: Uma Shankar uma.shankar@intel.com --- include/uapi/drm/drm_mode.h | 58 +++++++++++++++++++++++++++++++++++++ 1 file changed, 58 insertions(+)
diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h index 9b6722d45f36..d0ce48d2e732 100644 --- a/include/uapi/drm/drm_mode.h +++ b/include/uapi/drm/drm_mode.h @@ -819,6 +819,64 @@ struct hdr_output_metadata { }; };
+/* + * DRM_MODE_LUT_GAMMA|DRM_MODE_LUT_DEGAMMA is legal and means the LUT + * can be used for either purpose, but not simultaneously. To expose + * modes that support gamma and degamma simultaneously the gamma mode + * must declare distinct DRM_MODE_LUT_GAMMA and DRM_MODE_LUT_DEGAMMA + * ranges. + */ +/* LUT is for gamma (after CTM) */ +#define DRM_MODE_LUT_GAMMA BIT(0) +/* LUT is for degamma (before CTM) */ +#define DRM_MODE_LUT_DEGAMMA BIT(1) +/* linearly interpolate between the points */ +#define DRM_MODE_LUT_INTERPOLATE BIT(2) +/* + * the last value of the previous range is the + * first value of the current range. + */ +#define DRM_MODE_LUT_REUSE_LAST BIT(3) +/* the curve must be non-decreasing */ +#define DRM_MODE_LUT_NON_DECREASING BIT(4) +/* the curve is reflected across origin for negative inputs */ +#define DRM_MODE_LUT_REFLECT_NEGATIVE BIT(5) +/* the same curve (red) is used for blue and green channels as well */ +#define DRM_MODE_LUT_SINGLE_CHANNEL BIT(6) + +struct drm_color_lut_range { + /* DRM_MODE_LUT_* */ + __u32 flags; + /* number of points on the curve */ + __u16 count; + /* input/output bits per component */ + __u8 input_bpc, output_bpc; + /* input start/end values */ + __s32 start, end; + /* output min/max values */ + __s32 min, max; +}; + +enum lut_type { + LUT_TYPE_DEGAMMA = 0, + LUT_TYPE_GAMMA = 1, +}; + +/* + * Creating 64 bit palette entries for better data + * precision. This will be required for HDR and + * similar color processing usecases. + */ +struct drm_color_lut_ext { + /* + * Data is U32.32 fixed point format. + */ + __u64 red; + __u64 green; + __u64 blue; + __u64 reserved; +}; + #define DRM_MODE_PAGE_FLIP_EVENT 0x01 #define DRM_MODE_PAGE_FLIP_ASYNC 0x02 #define DRM_MODE_PAGE_FLIP_TARGET_ABSOLUTE 0x4