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@xxxxxxxxx>
---
drivers/gpu/drm/drm_crtc.c | 13 +++++++++++++
include/drm/drm_crtc.h | 6 ++++++
2 files changed, 19 insertions(+)
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index dd6fb86..7a639db 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -1489,6 +1489,19 @@ 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 78756c1..cc29df7 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -1045,6 +1045,8 @@ struct drm_mode_config_funcs {
* @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
+ * @cm_coeff_before_ctm_property: query no of correction coeffi before CTM
+ * @cm_coeff_after_ctm_property: query no of correction coeffi after CTM
* @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?
@@ -1155,6 +1157,10 @@ struct drm_mode_config {
struct drm_property *cm_palette_after_ctm_property;
struct drm_property *cm_ctm_property;
+ /* Color correction 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
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