[PATCH 09/23] drm/i915: Register pipe color capabilities

[Shashank Sharma]

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 at intel.com>
---
 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