drm/rockchip: add loader_protect for logo display

Change-Id: I01583e402aafcfb6f676f3fcb27e7d6b5107f3dd
Signed-off-by: Sandy Huang <hjc@rock-chips.com>

drivers/gpu/drm/drm_atomic_helper.c

@@ -921,6 +921,7 @@ disable_outputs(struct drm_device *dev, struct drm_atomic_state *old_state)
 
 	for_each_oldnew_connector_in_state(old_state, connector, old_conn_state, new_conn_state, i) {
 		const struct drm_encoder_helper_funcs *funcs;
+		const struct drm_connector_helper_funcs *conn_funcs;
 		struct drm_encoder *encoder;
 
 		/* Shut down everything that's in the changeset and currently
@@ -947,12 +948,32 @@ disable_outputs(struct drm_device *dev, struct drm_atomic_state *old_state)
 		DRM_DEBUG_ATOMIC("disabling [ENCODER:%d:%s]\n",
 				 encoder->base.id, encoder->name);
 
+		conn_funcs = connector->helper_private;
+		if (connector->loader_protect) {
+			drm_bridge_pre_enable(encoder->bridge);
+
+			if (funcs->enable)
+				funcs->enable(encoder);
+			else
+				funcs->commit(encoder);
+
+			drm_bridge_enable(encoder->bridge);
+
+			if (conn_funcs->loader_protect)
+				conn_funcs->loader_protect(connector, false);
+			connector->loader_protect = false;
+		}
 		/*
 		 * Each encoder has at most one connector (since we always steal
 		 * it away), so we won't call disable hooks twice.
 		 */
 		drm_bridge_disable(encoder->bridge);
 
+		if (encoder->loader_protect) {
+			if (funcs->loader_protect)
+				funcs->loader_protect(encoder, false);
+			encoder->loader_protect = false;
+		}
 		/* Right function depends upon target state. */
 		if (funcs) {
 			if (new_conn_state->crtc && funcs->prepare)

include/drm/drm_connector.h

@@ -984,6 +984,11 @@ struct drm_connector {
 	 * need the CRTC driving this output, &drm_connector_state.crtc.
 	 */
 	struct drm_encoder *encoder;
+	/**
+	 * @loader_protect:
+	 * connector loader logo protect state.
+	 */
+	bool loader_protect;
 
 #define MAX_ELD_BYTES	128
 	/** @eld: EDID-like data, if present */

include/drm/drm_encoder.h

@@ -166,6 +166,11 @@ struct drm_encoder {
 	 */
 	uint32_t possible_clones;
 
+	/**
+	 * @loader_protect:
+	 * encoder loader logo protect state.
+	 */
+	bool loader_protect;
 	/**
 	 * @crtc: Currently bound CRTC, only really meaningful for non-atomic
 	 * drivers.  Atomic drivers should instead check

include/drm/drm_modeset_helper_vtables.h

@@ -464,6 +464,11 @@ static inline void drm_crtc_helper_add(struct drm_crtc *crtc,
  * helpers and the new atomic modesetting helpers.
  */
 struct drm_encoder_helper_funcs {
+	/**
+	 * @loader_protect:
+	 * protect loader logo encoder's power.
+	 */
+	int (*loader_protect)(struct drm_encoder *encoder, bool on);
 	/**
 	 * @dpms:
 	 *
@@ -780,6 +785,12 @@ static inline void drm_encoder_helper_add(struct drm_encoder *encoder,
  * probe helpers.
  */
 struct drm_connector_helper_funcs {
+	/**
+	 * @loader_protect:
+	 *
+	 * protect loader logo connector's power
+	 */
+	int (*loader_protect)(struct drm_connector *connector, bool on);
 	/**
 	 * @get_modes:
 	 *