[Intel-gfx] [PATCH v8 01/25] drm: Create Color Management DRM properties

[Shashank Sharma]

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 at intel.com>
Signed-off-by: Kausal Malladi <kausalmalladi at gmail.com>
---
 drivers/gpu/drm/drm_crtc.c | 19 +++++++++++++++++++
 include/drm/drm_crtc.h     |  8 ++++++++
 2 files changed, 27 insertions(+)

diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 32dd134..dd6fb86 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 4765df3..78756c1 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -1042,6 +1042,9 @@ struct drm_mode_config_funcs {
  * @property_blob_list: list of all the blob property objects
  * @blob_lock: mutex for blob property allocation and management
  * @*_property: core property tracking
+ * @cm_palette_before_ctm_property: color corrections before CTM block
+ * @cm_palette_after_ctm_property: color corrections after CTM block
+ * @cm_ctm_property: color transformation matrix correction
  * @preferred_depth: preferred RBG pixel depth, used by fb helpers
  * @prefer_shadow: hint to userspace to prefer shadow-fb rendering
  * @async_page_flip: does this device support async flips on the primary plane?
@@ -1147,6 +1150,11 @@ struct drm_mode_config {
 	struct drm_property *suggested_x_property;
 	struct drm_property *suggested_y_property;
 
+	/* Color correction 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;
 
-- 
1.9.1