[PATCH 06/16] drm/i915: Load gamma color capabilities for CHV CRTC

[Kausal Malladi]

As per Color Manager design, each driver is responsible to load its
palette color correction and enhancement capabilities in the form of
a DRM blob property, so that user space can query and read.

This patch loads all CHV platform specific gamma color capabilities
for CRTC into a blob that can be accessible by user space to
query capabilities via DRM property interface.

Signed-off-by: Shashank Sharma <shashank.sharma at intel.com>
Signed-off-by: Kausal Malladi <Kausal.Malladi at intel.com>
---
 drivers/gpu/drm/i915/intel_color_manager.c | 48 ++++++++++++++++++++++++++++++
 drivers/gpu/drm/i915/intel_color_manager.h |  4 +++
 2 files changed, 52 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_color_manager.c b/drivers/gpu/drm/i915/intel_color_manager.c
index baa4536..def20d0f 100644
--- a/drivers/gpu/drm/i915/intel_color_manager.c
+++ b/drivers/gpu/drm/i915/intel_color_manager.c
@@ -27,15 +27,63 @@
 
 #include "intel_color_manager.h"
 
+int get_chv_pipe_gamma_capabilities(struct drm_device *dev,
+		struct drm_palette_caps *palette_caps, struct drm_crtc *crtc)
+{
+	struct drm_property_blob *blob = NULL;
+	struct drm_mode_config *config = &dev->mode_config;
+	int ret;
+
+	/*
+	 * This function exposes best capability for DeGamma and Gamma
+	 * For CHV, the DeGamma LUT has 65 entries
+	 * and the best Gamma capability has 257 entries (CGM unit)
+	 */
+	palette_caps->version = CHV_PALETTE_STRUCT_VERSION;
+	palette_caps->num_samples_before_ctm =
+		CHV_DEGAMMA_MAX_VALS;
+	palette_caps->num_samples_after_ctm =
+		CHV_10BIT_GAMMA_MAX_VALS;
+
+	ret = drm_property_replace_global_blob(dev, &blob,
+			sizeof(struct drm_palette_caps),
+			(const void *)palette_caps,
+			&crtc->base, config->prop_color_capabilities);
+	if (ret) {
+		DRM_ERROR("Error updating Gamma blob\n");
+		return -EFAULT;
+	}
+
+	return 0;
+}
+
+int get_pipe_gamma_capabilities(struct drm_device *dev,
+		struct drm_palette_caps *palette_caps, struct drm_crtc *crtc)
+{
+	if (IS_CHERRYVIEW(dev))
+		return get_chv_pipe_gamma_capabilities(dev, palette_caps, crtc);
+	return -EINVAL;
+}
+
 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 ret;
 
 	if (IS_CHERRYVIEW(dev)) {
+		crtc = obj_to_crtc(mode_obj);
 		if (config->prop_color_capabilities)
 			drm_object_attach_property(mode_obj,
 					config->prop_color_capabilities, 0);
+		palette_caps = kzalloc(sizeof(struct drm_palette_caps),
+				GFP_KERNEL);
+		ret = get_pipe_gamma_capabilities(dev, palette_caps, crtc);
+		if (ret)
+			DRM_ERROR("Error getting gamma capability for CHV\n");
+
 		if (config->prop_palette_before_ctm)
 			drm_object_attach_property(mode_obj,
 					config->prop_palette_before_ctm, 0);
diff --git a/drivers/gpu/drm/i915/intel_color_manager.h b/drivers/gpu/drm/i915/intel_color_manager.h
index 04c921d..51aeb91 100644
--- a/drivers/gpu/drm/i915/intel_color_manager.h
+++ b/drivers/gpu/drm/i915/intel_color_manager.h
@@ -27,3 +27,7 @@
 #include <drm/drmP.h>
 #include <drm/drm_crtc_helper.h>
 #include "i915_drv.h"
+
+#define CHV_PALETTE_STRUCT_VERSION		1
+#define CHV_DEGAMMA_MAX_VALS			65
+#define CHV_10BIT_GAMMA_MAX_VALS		257
-- 
2.4.5