drm/drm_of: add drm_of_panel_bridge_remove function

This function is the pendant of drm_of_find_panel_or_bridge()
to remove a previously allocated panel_bridge.
Given a specific port and endpoint it remove the panel bridge.
Since drm_panel_bridge_remove() will check that bridge parameter
is not NULL and is a real drm_panel_bridge and no a simple bridge
it is safe to call it directly.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Reviewed-by: Philippe Cornu <philippe.cornu@st.com>
Tested-by: Philippe Cornu <philippe.cornu@st.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1506936888-23844-3-git-send-email-benjamin.gaignard@linaro.org

diff --git a/drivers/gpu/drm/drm_of.c b/drivers/gpu/drm/drm_of.c
index 4c191c050e7dac2093abdbfbbd4e18d1efb182b2..7a36934ea5dbe55783bd89de86fd867f5c582756 100644 (file)
--- a/drivers/gpu/drm/drm_of.c
+++ b/drivers/gpu/drm/drm_of.c
@@ -262,3 +262,36 @@ int drm_of_find_panel_or_bridge(const struct device_node *np,
        return ret;
 }
 EXPORT_SYMBOL_GPL(drm_of_find_panel_or_bridge);
+
+#ifdef CONFIG_DRM_PANEL_BRIDGE
+/*
+ * drm_of_panel_bridge_remove - remove panel bridge
+ * @np: device tree node containing panel bridge output ports
+ *
+ * Remove the panel bridge of a given DT node's port and endpoint number
+ *
+ * Returns zero if successful, or one of the standard error codes if it fails.
+ */
+int drm_of_panel_bridge_remove(const struct device_node *np,
+                              int port, int endpoint)
+{
+       struct drm_bridge *bridge;
+       struct device_node *remote;
+
+       remote = of_graph_get_remote_node(np, port, endpoint);
+       if (!remote)
+               return -ENODEV;
+
+       bridge = of_drm_find_bridge(remote);
+       drm_panel_bridge_remove(bridge);
+
+       return 0;
+}
+#else
+int drm_of_panel_bridge_remove(const struct device_node *np,
+                              int port, int endpoint)
+{
+       return -EINVAL;
+}
+#endif
+EXPORT_SYMBOL_GPL(drm_of_panel_bridge_remove);

diff --git a/include/drm/drm_of.h b/include/drm/drm_of.h
index 104dd517fdbe032d4f0f5a87e96b64efbfe4b6b5..390966e4a308bb4536ab908df7a1f6e87bcac6b3 100644 (file)
--- a/include/drm/drm_of.h
+++ b/include/drm/drm_of.h
@@ -29,6 +29,8 @@ int drm_of_find_panel_or_bridge(const struct device_node *np,
                                int port, int endpoint,
                                struct drm_panel **panel,
                                struct drm_bridge **bridge);
+int drm_of_panel_bridge_remove(const struct device_node *np,
+                              int port, int endpoint);
 #else
 static inline uint32_t drm_of_find_possible_crtcs(struct drm_device *dev,
                                                  struct device_node *port)
@@ -65,6 +67,12 @@ static inline int drm_of_find_panel_or_bridge(const struct device_node *np,
 {
        return -EINVAL;
 }
+
+static inline int drm_of_panel_bridge_remove(const struct device_node *np,
+                                            int port, int endpoint)
+{
+       return -EINVAL;
+}
 #endif
 
 static inline int drm_of_encoder_active_endpoint_id(struct device_node *node,