[PATCH v7 01/25] drm: Create Color Management DRM properties

Shashank Sharma
2015-10-20T12:34:28Z

Color Management is an extension to DRM framework. It allows
abstraction of hardware color correction and enhancement capabilities
by virtue of DRM properties.

There are two major types of color correction supported by DRM
color manager:
- CTM: color transformation matrix, properties where a correction
matrix is used for color correction.
- Palette correction: Where direct LUT values are sent to be applied
on a color palette.

This patch initializes color management framework by:
1. Introducing new pointers in DRM mode_config structure to
carry CTM and Palette color correction properties.
2. Creating these DRM properties in DRM standard properties creation
sequence.

Signed-off-by: Shashank Sharma <shashank.sharma@intel.com>
Signed-off-by: Kausal Malladi <kausalmalladi@gmail.com>
---
drivers/gpu/drm/drm_crtc.c | 19 +++++++++++++++++++
include/drm/drm_crtc.h | 5 +++++
2 files changed, 24 insertions(+)

diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index e54660a..cee1415 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -1470,6 +1470,25 @@ static int drm_mode_create_standard_properties(struct drm_device *dev)
return -ENOMEM;
dev->mode_config.prop_mode_id = prop;

+ /* Color Management properties */
+ prop = drm_property_create(dev,
+ DRM_MODE_PROP_BLOB, "PALETTE_AFTER_CTM", 0);
+ if (!prop)
+ return -ENOMEM;
+ dev->mode_config.cm_palette_after_ctm_property = prop;
+
+ prop = drm_property_create(dev,
+ DRM_MODE_PROP_BLOB, "PALETTE_BEFORE_CTM", 0);
+ if (!prop)
+ return -ENOMEM;
+ dev->mode_config.cm_palette_before_ctm_property = prop;
+
+ prop = drm_property_create(dev,
+ DRM_MODE_PROP_BLOB, "CTM", 0);
+ if (!prop)
+ return -ENOMEM;
+ dev->mode_config.cm_ctm_property = prop;
+
return 0;
}

diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index 3f0c690..4225341 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -1143,6 +1143,11 @@ struct drm_mode_config {
struct drm_property *suggested_x_property;
struct drm_property *suggested_y_property;

+ /* Color Management Properties */
+ struct drm_property *cm_palette_before_ctm_property;
+ struct drm_property *cm_palette_after_ctm_property;
+ struct drm_property *cm_ctm_property;
+
/* dumb ioctl parameters */
uint32_t preferred_depth, prefer_shadow;