[PATCH 10/23] drm/i915: Add gamma correction handlers

[Shashank Sharma]

I915 driver registers gamma correction as palette correction
property with DRM layer. This patch adds set_property() and get_property()
handlers for pipe level gamma correction.

The set function attaches the Gamma correction blob to CRTC state, these
values will be committed during atomic commit.

Signed-off-by: Shashank Sharma <shashank.sharma at intel.com>
Signed-off-by: Kausal Malladi <kausalmalladi at gmail.com>
---
 drivers/gpu/drm/i915/intel_atomic.c        | 20 ++++++++++++++++++++
 drivers/gpu/drm/i915/intel_color_manager.c | 21 +++++++++++++++++++++
 drivers/gpu/drm/i915/intel_drv.h           |  5 +++++
 3 files changed, 46 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_atomic.c b/drivers/gpu/drm/i915/intel_atomic.c
index 500d2998..0b61fef 100644
--- a/drivers/gpu/drm/i915/intel_atomic.c
+++ b/drivers/gpu/drm/i915/intel_atomic.c
@@ -315,6 +315,13 @@ int intel_crtc_atomic_set_property(struct drm_crtc *crtc,
 				   struct drm_property *property,
 				   uint64_t val)
 {
+	struct drm_device *dev = crtc->dev;
+	struct drm_mode_config *config = &dev->mode_config;
+
+	if (property == config->cm_palette_after_ctm_property)
+		return intel_color_manager_set_pipe_gamma(dev, state,
+				&crtc->base, val);
+
 	DRM_DEBUG_KMS("Unknown crtc property '%s'\n", property->name);
 	return -EINVAL;
 }
@@ -324,6 +331,19 @@ int intel_crtc_atomic_get_property(struct drm_crtc *crtc,
 				   struct drm_property *property,
 				   uint64_t *val)
 {
+	struct drm_device *dev = crtc->dev;
+	struct drm_mode_config *config = &dev->mode_config;
+
+	if (property == config->cm_palette_after_ctm_property) {
+		*val = (state->palette_after_ctm_blob) ?
+			state->palette_after_ctm_blob->base.id : 0;
+		goto found;
+	}
+
 	DRM_DEBUG_KMS("Unknown crtc property '%s'\n", property->name);
 	return -EINVAL;
+
+found:
+	DRM_DEBUG_KMS("Found property %s\n", property->name);
+	return 0;
 }
diff --git a/drivers/gpu/drm/i915/intel_color_manager.c b/drivers/gpu/drm/i915/intel_color_manager.c
index 77f58f2..9421bb6 100644
--- a/drivers/gpu/drm/i915/intel_color_manager.c
+++ b/drivers/gpu/drm/i915/intel_color_manager.c
@@ -27,6 +27,27 @@
 
 #include "intel_color_manager.h"
 
+int intel_color_manager_set_pipe_gamma(struct drm_device *dev,
+		struct drm_crtc_state *crtc_state,
+		struct drm_mode_object *obj, uint32_t blob_id)
+{
+	struct drm_property_blob *blob;
+
+	blob = drm_property_lookup_blob(dev, blob_id);
+	if (!blob) {
+		DRM_DEBUG_KMS("Invalid Blob ID\n");
+		return -EINVAL;
+	}
+
+	if (crtc_state->palette_after_ctm_blob)
+		drm_property_unreference_blob(
+			crtc_state->palette_after_ctm_blob);
+
+	/* Attach the blob to be committed in state */
+	crtc_state->palette_after_ctm_blob = blob;
+	return 0;
+}
+
 int get_pipe_capabilities(struct drm_device *dev,
 		struct drm_palette_caps *palette_caps, struct drm_crtc *crtc)
 {
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index e27e754..d0193e2 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1466,4 +1466,9 @@ void intel_plane_destroy_state(struct drm_plane *plane,
 			       struct drm_plane_state *state);
 extern const struct drm_plane_helper_funcs intel_plane_helper_funcs;
 
+/* intel_color_manager.c */
+int intel_color_manager_set_pipe_gamma(struct drm_device *dev,
+		struct drm_crtc_state *crtc_state,
+		struct drm_mode_object *obj, uint32_t blob_id);
+
 #endif /* __INTEL_DRV_H__ */
-- 
1.9.1