DRM color manager contains these color properties:
1. "crtc_palette_capabilities_property": to allow a
core driver to load and showcase its color correction
capabilities to user space.
2. "ctm": Color transformation matrix property, where a
color transformation matrix of 9 correction values gets
applied as correction.
3. "palette_before_ctm": for corrections which get applied
beore color transformation matrix correction.
4. "palette_after_ctm": for corrections which get applied
after color transformation matrix correction.
Intel color manager registers:
1. Gamma correction property as "palette_after_ctm" property
2. Degamma correction capability as "palette_bafore_ctm" property
capability as "palette_after_ctm" DRM color property hook.
3. CSC as "ctm" property.
This patch does the following:
1. Add a function which loads the platform's color correction
capabilities in the cm_crtc_palette_capabilities_property structure.
2. Attaches the cm_crtc_palette_capabilities_property to every CRTC
getting initiaized.
3. Adds two new parameters "num_samples_after_ctm" and
"num_samples_before_ctm" in intel_device_info as gamma and
degamma coefficients vary per platform basis.
Signed-off-by: Shashank Sharma <shashank.sharma@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_drv.h | 2 ++
drivers/gpu/drm/i915/intel_color_manager.c | 45 ++++++++++++++++++++++++++++++
drivers/gpu/drm/i915/intel_color_manager.h | 2 ++
3 files changed, 49 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 3bf8a9b..22de2cb 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -798,6 +798,8 @@ struct intel_device_info {
u8 num_sprites[I915_MAX_PIPES];
u8 gen;
u8 ring_mask; /* Rings supported by the HW */
+ u16 num_samples_after_ctm;
+ u16 num_samples_before_ctm;
DEV_INFO_FOR_EACH_FLAG(DEFINE_FLAG, SEP_SEMICOLON);
/* Register offsets for the various display pipes and transcoders */
int pipe_offsets[I915_MAX_TRANSCODERS];
diff --git a/drivers/gpu/drm/i915/intel_color_manager.c b/drivers/gpu/drm/i915/intel_color_manager.c
index 7357d99..77f58f2 100644
--- a/drivers/gpu/drm/i915/intel_color_manager.c
+++ b/drivers/gpu/drm/i915/intel_color_manager.c
@@ -27,7 +27,52 @@
#include "intel_color_manager.h"
+int get_pipe_capabilities(struct drm_device *dev,
+ struct drm_palette_caps *palette_caps, struct drm_crtc *crtc)
+{
+ struct drm_property_blob *blob;
+
+ /*
+ * This function loads best capability for gamma correction
+ * For example:
+ * CHV best Gamma correction (CGM unit, 10 bit)
+ * has 257 entries, best degamma is 65 entries
+ */
+ palette_caps->version = COLOR_STRUCT_VERSION;
+ palette_caps->num_samples_after_ctm =
+ INTEL_INFO(dev)->num_samples_after_ctm;
+ palette_caps->num_samples_before_ctm =
+ INTEL_INFO(dev)->num_samples_before_ctm;
+ blob = drm_property_create_blob(dev, sizeof(struct drm_palette_caps),
+ (const void *) palette_caps);
+ if (IS_ERR_OR_NULL(blob)) {
+ DRM_ERROR("Create blob for capabilities failed\n");
+ return PTR_ERR(blob);
+ }
+
+ return blob->base.id;
+}
+
void intel_attach_color_properties_to_crtc(struct drm_device *dev,
struct drm_mode_object *mode_obj)
{
+ struct drm_mode_config *config = &dev->mode_config;
+ struct drm_palette_caps *palette_caps;
+ struct drm_crtc *crtc;
+ int capabilities_blob_id;
+
+ crtc = obj_to_crtc(mode_obj);
+ palette_caps = kzalloc(sizeof(struct drm_palette_caps),
+ GFP_KERNEL);
+ capabilities_blob_id = get_pipe_capabilities(dev,
+ palette_caps, crtc);
+
+ if (config->cm_crtc_palette_capabilities_property) {
+ drm_object_attach_property(mode_obj,
+ config->cm_crtc_palette_capabilities_property,
+ capabilities_blob_id);
+ DRM_DEBUG_DRIVER("Capabilities attached to CRTC\n");
+ }
+
+ kfree(palette_caps);
}
diff --git a/drivers/gpu/drm/i915/intel_color_manager.h b/drivers/gpu/drm/i915/intel_color_manager.h
index 04c921d..1a42244 100644
--- a/drivers/gpu/drm/i915/intel_color_manager.h
+++ b/drivers/gpu/drm/i915/intel_color_manager.h
@@ -27,3 +27,5 @@
#include <drm/drmP.h>
#include <drm/drm_crtc_helper.h>
#include "i915_drv.h"
+
+#define COLOR_STRUCT_VERSION 1
--
1.9.1
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