drm: Add Client Cap for advance degamma mode

A client cap advance degamma mode is introduced. Minimum requirement
for a client to set this capability is if it can use 64 bit LUT
values as defined by the structure drm_color_lut_ext on a supported
platform.

If not set driver will work in legacy mode.

v2: Fix typo (Bhanu)

Signed-off-by: Borah, Chaitanya Kumar <chaitanya.kumar.borah@intel.com>

drivers/gpu/drm/drm_atomic_uapi.c

@@ -415,10 +415,13 @@ static int drm_atomic_crtc_set_property(struct drm_crtc *crtc,
 	} else if (property == config->prop_vrr_enabled) {
 		state->vrr_enabled = val;
 	} else if (property == config->degamma_lut_property) {
+		ssize_t size = state->advance_degamma_mode_active ?
+				sizeof(struct drm_color_lut_ext) :
+				sizeof(struct drm_color_lut);
 		ret = drm_atomic_replace_property_blob_from_id(dev,
 					&state->degamma_lut,
 					val,
-					-1, sizeof(struct drm_color_lut),
+					-1, size,
 					&replaced);
 		state->color_mgmt_changed |= replaced;
 		return ret;
@@ -1060,6 +1063,8 @@ int drm_atomic_set_property(struct drm_atomic_state *state,
 
 		crtc_state->advance_gamma_mode_active =
 					state->advance_gamma_mode_active;
+		crtc_state->advance_degamma_mode_active =
+					state->advance_degamma_mode_active;
 		ret = drm_atomic_crtc_set_property(crtc,
 				crtc_state, prop, prop_value);
 		break;
@@ -1397,6 +1402,7 @@ int drm_mode_atomic_ioctl(struct drm_device *dev,
 	state->acquire_ctx = &ctx;
 	state->allow_modeset = !!(arg->flags & DRM_MODE_ATOMIC_ALLOW_MODESET);
 	state->advance_gamma_mode_active = file_priv->advance_gamma_mode_active;
+	state->advance_degamma_mode_active = file_priv->advance_degamma_mode_active;
 
 retry:
 	copied_objs = 0;

drivers/gpu/drm/drm_ioctl.c

@@ -367,6 +367,11 @@ drm_setclientcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
 			return -EINVAL;
 		file_priv->advance_gamma_mode_active = req->value;
 		break;
+	case DRM_CLIENT_CAP_ADVANCE_DEGAMMA_MODES:
+		if (req->value > 1)
+			return -EINVAL;
+		file_priv->advance_degamma_mode_active = req->value;
+		break;
 	default:
 		return -EINVAL;
 	}

include/drm/drm_atomic.h

@@ -399,6 +399,7 @@ struct drm_atomic_state {
 	 */
 	bool duplicated : 1;
 	bool advance_gamma_mode_active : 1;
+	bool advance_degamma_mode_active : 1;
 	struct __drm_planes_state *planes;
 	struct __drm_crtcs_state *crtcs;
 	int num_connector;

include/drm/drm_crtc.h

@@ -162,6 +162,11 @@ struct drm_crtc_state {
 	 */
 	bool advance_gamma_mode_active : 1;
 
+	/**
+	 * This is to indicate advance degamma mode support
+	 */
+	bool advance_degamma_mode_active : 1;
+
 	/**
 	 * @no_vblank:
 	 *
@@ -1045,6 +1050,9 @@ struct drm_crtc {
 	/** To handle advance gamma mode support */
 	bool advance_gamma_mode_active : 1;
 
+	/** To handle advance degamma mode support */
+	bool advance_degamma_mode_active : 1;
+
 	/**
 	 * @mode:
 	 *

include/drm/drm_file.h

@@ -214,6 +214,14 @@ struct drm_file {
 	 */
 	bool advance_gamma_mode_active : 1;
 
+	/**
+	 * This is to enable advance degamma modes using
+	 * 64 bit LUT values
+	 *
+	 * True if client understands advance degamma
+	 */
+	bool advance_degamma_mode_active : 1;
+
 	/**
 	 * @was_master:
 	 *

include/uapi/drm/drm.h

@@ -846,6 +846,16 @@ struct drm_get_cap {
  */
 #define DRM_CLIENT_CAP_ADVANCE_GAMMA_MODES     6
 
+/**
+ * DRM_CLIENT_CAP_ADVANCE_DEGAMMA_MODES
+ *
+ * Add support for advance degamma mode UAPI
+ * If set to 1, DRM will enable advance degamma mode
+ * UAPI to process degamma mode with 64 bit LUT
+ * values
+ */
+#define DRM_CLIENT_CAP_ADVANCE_DEGAMMA_MODES     7
+
 /* DRM_IOCTL_SET_CLIENT_CAP ioctl argument type */
 struct drm_set_client_cap {
 	__u64 capability;