[PATCH v4 03/11] drm/msm/hdmi: switch to of_drm_get_bridge_by_endpoint()

[Luca Ceresoli <luca.ceresoli@bootlin.com>]

This driver calls drm_of_find_panel_or_bridge() with a NULL pointer in the
@panel parameter, thus using a reduced feature set of that function.
Replace this call with the simpler of_drm_get_bridge_by_endpoint().

Since of_drm_get_bridge_by_endpoint() increases the refcount of the
returned bridge, ensure it is put on removal.

Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>

---

Changes in v4:
- ensure next_bridge is put on later probe failures

Changes in v3:
- fix ERR_PTR deref when -ENODEV is returned
---
 drivers/gpu/drm/msm/hdmi/hdmi.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/msm/hdmi/hdmi.c b/drivers/gpu/drm/msm/hdmi/hdmi.c
index d9491aac1a89..57e85ac38059 100644
--- a/drivers/gpu/drm/msm/hdmi/hdmi.c
+++ b/drivers/gpu/drm/msm/hdmi/hdmi.c
@@ -285,9 +285,14 @@ static int msm_hdmi_dev_probe(struct platform_device *pdev)
 	spin_lock_init(&hdmi->reg_lock);
 	mutex_init(&hdmi->state_mutex);
 
-	ret = drm_of_find_panel_or_bridge(dev_of_node(dev), 1, 0, NULL, &hdmi->next_bridge);
-	if (ret && ret != -ENODEV)
-		return ret;
+	struct drm_bridge *next_bridge __free(drm_bridge_put) =
+		of_drm_get_bridge_by_endpoint(dev_of_node(dev), 1, 0);
+	if (IS_ERR(next_bridge)) {
+		if (PTR_ERR(next_bridge) == -ENODEV)
+			next_bridge = NULL;
+		else
+			return PTR_ERR(next_bridge);
+	}
 
 	hdmi->mmio = msm_ioremap(pdev, "core_physical");
 	if (IS_ERR(hdmi->mmio))
@@ -367,6 +372,8 @@ static int msm_hdmi_dev_probe(struct platform_device *pdev)
 	if (ret)
 		goto err_put_phy;
 
+	hdmi->next_bridge = no_free_ptr(next_bridge);
+
 	return 0;
 
 err_put_phy:
@@ -381,6 +388,7 @@ static void msm_hdmi_dev_remove(struct platform_device *pdev)
 	component_del(&pdev->dev, &msm_hdmi_ops);
 
 	msm_hdmi_put_phy(hdmi);
+	drm_bridge_put(hdmi->next_bridge);
 }
 
 static int msm_hdmi_runtime_suspend(struct device *dev)

-- 
2.53.0