From 5488dc16fde74595a40c5d20ae52d978313f0b4e Mon Sep 17 00:00:00 2001 From: Lionel Landwerlin Date: Fri, 26 Feb 2016 17:05:00 +0000 Subject: drm: introduce pipe color correction properties Patch based on a previous series by Shashank Sharma. This introduces optional properties to enable color correction at the pipe level. It relies on 3 transformations applied to every pixels displayed. First a lookup into a degamma table, then a multiplication of the rgb components by a 3x3 matrix and finally another lookup into a gamma table. The following properties can be added to a pipe : - DEGAMMA_LUT : blob containing degamma LUT - DEGAMMA_LUT_SIZE : number of elements in DEGAMMA_LUT - CTM : transformation matrix applied after the degamma LUT - GAMMA_LUT : blob containing gamma LUT - GAMMA_LUT_SIZE : number of elements in GAMMA_LUT DEGAMMA_LUT_SIZE and GAMMA_LUT_SIZE are read only properties, set by the driver to tell userspace applications what sizes should be the lookup tables in DEGAMMA_LUT and GAMMA_LUT. A helper is also provided so legacy gamma correction is redirected through these new properties. v2: Register LUT size properties as range v3: Fix round in drm_color_lut_get_value() helper More docs on how degamma/gamma properties are used v4: Update contributors v5: Rename CTM_MATRIX property to CTM (Doh!) Add legacy gamma_set atomic helper Describe CTM/LUT acronyms in the kernel doc v6: Fix missing blob unref in drm_atomic_helper_crtc_reset Signed-off-by: Shashank Sharma Signed-off-by: Kumar, Kiran S Signed-off-by: Kausal Malladi Signed-off-by: Lionel Landwerlin Reviewed-by: Matt Roper Acked-by: Rob Bradford [danvet: CrOS maintainers are also happy with the userspacde side: https://codereview.chromium.org/1182063002/ ] Reviewed-by: Daniel Stone Signed-off-by: Daniel Vetter Link: http://patchwork.freedesktop.org/patch/msgid/1456506302-640-4-git-send-email-lionel.g.landwerlin@intel.com --- include/uapi/drm/drm_mode.h | 15 +++++++++++++++ 1 file changed, 15 insertions(+) (limited to 'include/uapi') diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h index 50adb46..c021743 100644 --- a/include/uapi/drm/drm_mode.h +++ b/include/uapi/drm/drm_mode.h @@ -487,6 +487,21 @@ struct drm_mode_crtc_lut { __u64 blue; }; +struct drm_color_ctm { + /* Conversion matrix in S31.32 format. */ + __s64 matrix[9]; +}; + +struct drm_color_lut { + /* + * Data is U0.16 fixed point format. + */ + __u16 red; + __u16 green; + __u16 blue; + __u16 reserved; +}; + #define DRM_MODE_PAGE_FLIP_EVENT 0x01 #define DRM_MODE_PAGE_FLIP_ASYNC 0x02 #define DRM_MODE_PAGE_FLIP_FLAGS (DRM_MODE_PAGE_FLIP_EVENT|DRM_MODE_PAGE_FLIP_ASYNC) -- cgit v1.1