#include <linux/dma-buf.h>
#include <linux/module.h>
#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/of_graph.h>
#include <drm/drmP.h>
#include <drm/drm_atomic_helper.h>
{
struct drm_mode_config *mode_config;
struct pl111_drm_dev_private *priv = dev->dev_private;
- struct drm_panel *panel;
- struct drm_bridge *bridge;
+ struct device_node *np = dev->dev->of_node;
+ struct device_node *remote;
+ struct drm_panel *panel = NULL;
+ struct drm_bridge *bridge = NULL;
+ bool defer = false;
int ret = 0;
+ int i;
drm_mode_config_init(dev);
mode_config = &dev->mode_config;
mode_config->min_height = 1;
mode_config->max_height = 768;
- ret = drm_of_find_panel_or_bridge(dev->dev->of_node,
- 0, 0, &panel, &bridge);
- if (ret && ret != -ENODEV)
- return ret;
+ i = 0;
+ for_each_endpoint_of_node(np, remote) {
+ struct drm_panel *tmp_panel;
+ struct drm_bridge *tmp_bridge;
+
+ dev_dbg(dev->dev, "checking endpoint %d\n", i);
+
+ ret = drm_of_find_panel_or_bridge(dev->dev->of_node,
+ 0, i,
+ &tmp_panel,
+ &tmp_bridge);
+ if (ret) {
+ if (ret == -EPROBE_DEFER) {
+ /*
+ * Something deferred, but that is often just
+ * another way of saying -ENODEV, but let's
+ * cast a vote for later deferral.
+ */
+ defer = true;
+ } else if (ret != -ENODEV) {
+ /* Continue, maybe something else is working */
+ dev_err(dev->dev,
+ "endpoint %d returns %d\n", i, ret);
+ }
+ }
+
+ if (tmp_panel) {
+ dev_info(dev->dev,
+ "found panel on endpoint %d\n", i);
+ panel = tmp_panel;
+ }
+ if (tmp_bridge) {
+ dev_info(dev->dev,
+ "found bridge on endpoint %d\n", i);
+ bridge = tmp_bridge;
+ }
+
+ i++;
+ }
+
+ /*
+ * If we can't find neither panel nor bridge on any of the
+ * endpoints, and any of them retured -EPROBE_DEFER, then
+ * let's defer this driver too.
+ */
+ if ((!panel && !bridge) && defer)
+ return -EPROBE_DEFER;
+
if (panel) {
bridge = drm_panel_bridge_add(panel,
DRM_MODE_CONNECTOR_Unknown);