[PATCH v5 02/22] drm: Create Color Management query properties

[Shashank Sharma]

DRM color management is written to extract the color correction
capabilities of various platforms, and every platform can showcase
its capabilities using the query properties.

Different hardwares can have different no of coefficients for palette
correction. Also the correction can be applied after/before color
transformation (CTM) unit in the display pipeline.

This patch adds two new read-only properties,
  - cm_coeff_before_ctm_property: A platform driver should use this
    property to show supported no_of_coefficients for palette correction,
    which gets applied before ctm correction.
  - cm_coeff_after_ctm_property: A platform driver should use this property
    to show supported no_of_coefficients for palette correction, which gets
    applied after ctm correction.

Signed-off-by: Shashank Sharma <shashank.sharma at intel.com>
---
 drivers/gpu/drm/drm_crtc.c | 13 +++++++++++++
 include/drm/drm_crtc.h     |  4 ++++
 2 files changed, 17 insertions(+)

diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 3644342..ad13630 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -1491,6 +1491,19 @@ static int drm_mode_create_standard_properties(struct drm_device *dev)
 		return -ENOMEM;
 	dev->mode_config.cm_ctm_property = prop;
 
+	/* DRM properties to query color capabilities */
+	prop = drm_property_create(dev, DRM_MODE_PROP_IMMUTABLE,
+			"COEFFICIENTS_BEFORE_CTM", 0);
+	if (!prop)
+		return -ENOMEM;
+	dev->mode_config.cm_coeff_before_ctm_property = prop;
+
+	prop = drm_property_create(dev, DRM_MODE_PROP_IMMUTABLE,
+			"COEFFICIENTS_AFTER_CTM", 0);
+	if (!prop)
+		return -ENOMEM;
+	dev->mode_config.cm_coeff_after_ctm_property = prop;
+
 	return 0;
 }
 
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index 5ddc1a2..1a56596 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -1153,6 +1153,10 @@ struct drm_mode_config {
 	struct drm_property *cm_palette_after_ctm_property;
 	struct drm_property *cm_ctm_property;
 
+	/* Color management capabilities query */
+	struct drm_property *cm_coeff_before_ctm_property;
+	struct drm_property *cm_coeff_after_ctm_property;
+
 	/* dumb ioctl parameters */
 	uint32_t preferred_depth, prefer_shadow;
 
-- 
1.9.1