[RFC v1 4/7] drm/i915: Implement get set property handler for multi segment gamma

[Uma Shankar]

Implement get and set property handler for multi segment gamma
mode.

Signed-off-by: Uma Shankar <uma.shankar at intel.com>
---
 drivers/gpu/drm/i915/intel_display.c | 46 ++++++++++++++++++++++++++++++++++++
 drivers/gpu/drm/i915/intel_drv.h     | 12 ++++++++++
 2 files changed, 58 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 7604f16..8ac9728 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -13679,6 +13679,39 @@ static int intel_atomic_commit(struct drm_device *dev,
 	return 0;
 }
 
+static int
+intel_atomic_replace_property_blob_from_id(struct drm_device *dev,
+					   struct drm_property_blob **blob,
+					   u64 blob_id,
+					   ssize_t expected_size,
+					   ssize_t expected_elem_size,
+					   bool *replaced)
+{
+	struct drm_property_blob *new_blob = NULL;
+
+	if (blob_id != 0) {
+		new_blob = drm_property_lookup_blob(dev, blob_id);
+		if (!new_blob)
+			return -EINVAL;
+
+		if (expected_size > 0 &&
+		    new_blob->length != expected_size) {
+			drm_property_blob_put(new_blob);
+			return -EINVAL;
+		}
+		if (expected_elem_size > 0 &&
+		    new_blob->length % expected_elem_size != 0) {
+			drm_property_blob_put(new_blob);
+			return -EINVAL;
+		}
+	}
+
+	*replaced |= drm_property_replace_blob(blob, new_blob);
+	drm_property_blob_put(new_blob);
+
+	return 0;
+}
+
 /**
  * intel_crtc_atomic_get_property - hook for crtc->atomic_get_property.
  * @crtc: Crtc to get the property for.
@@ -13699,6 +13732,9 @@ int intel_crtc_atomic_get_property(struct drm_crtc *crtc,
 
 	if (property == dev_priv->gamma_mode_property) {
 		*val = intel_crtc_state->gamma_mode_type;
+	} else if (property == dev_priv->multi_segment_gamma_mode_property) {
+		*val = (intel_crtc_state->multi_segment_gamma_lut) ?
+			intel_crtc_state->multi_segment_gamma_lut->base.id : 0;
 	} else {
 		DRM_DEBUG_ATOMIC("Unknown property %s\n", property->name);
 		return -EINVAL;
@@ -13724,11 +13760,21 @@ int intel_crtc_atomic_set_property(struct drm_crtc *crtc,
 	struct drm_device *dev = crtc->dev;
 	struct drm_i915_private *dev_priv = to_i915(dev);
 	struct intel_crtc_state *intel_crtc_state = to_intel_crtc_state(state);
+	bool replaced = false;
+	int ret;
 
 	if (property == dev_priv->gamma_mode_property) {
 		intel_crtc_state->gamma_mode_type = val;
 		state->color_mgmt_changed |= replaced;
 		return 0;
+	} else if (property == dev_priv->multi_segment_gamma_mode_property) {
+		ret = intel_atomic_replace_property_blob_from_id(dev,
+					&intel_crtc_state->multi_segment_gamma_lut,
+					val, -1,
+					sizeof(struct multi_segment_gamma_lut),
+					&replaced);
+		state->color_mgmt_changed |= replaced;
+		return ret;
 	}
 
 	DRM_DEBUG_ATOMIC("Unknown property %s\n", property->name);
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index fd84fe9..7fccd28 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1037,6 +1037,18 @@ struct intel_crtc_state {
 	/* Gamma mode type programmed on the pipe */
 	u32 gamma_mode_type;
 
+	/**
+	 * @multi_segment_gamma_lut:
+	 *
+	 * Lookup table for converting pixel data after the color conversion
+	 * matrix @ctm.  See drm_crtc_enable_color_mgmt(). The blob (if not
+	 * NULL) is an array of &struct drm_color_lut.
+	 */
+	struct drm_property_blob *multi_segment_gamma_lut;
+
+	/* State to check for Gamma Mode Color Changes */
+	bool color_mgmt_changed : 1;
+
 	/* bitmask of planes that will be updated during the commit */
 	u8 update_planes;
 
-- 
1.9.1