drm/tilcdc: Initialize crtc->port

Initialize port device node pointer in the tilcdc crtc. Fixes "Falling
back to first CRTC" warning from tda998x driver.

The tda998x encoder driver calls drm_of_find_possible_crtcs() to
initialize possible_crtcs of struct drm_encoder. The crtc->port needs
to be initialized for drm_of_find_possible_crtcs() to work.

Signed-off-by: Jyri Sarha <jsarha@ti.com>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

1 files changed, 20 insertions, 0 deletions

diff --git a/drivers/gpu/drm/tilcdc/tilcdc_crtc.c b/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
index 248e3ea7568c..5f4da8c86ce2 100644
--- a/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
+++ b/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
@@ -124,6 +124,7 @@ static void tilcdc_crtc_destroy(struct drm_crtc *crtc)
 
         tilcdc_crtc_dpms(crtc, DRM_MODE_DPMS_OFF);
 
+        of_node_put(crtc->port);
         drm_crtc_cleanup(crtc);
         drm_flip_work_cleanup(&tilcdc_crtc->unref_work);
 
@@ -749,6 +750,7 @@ irqreturn_t tilcdc_crtc_irq(struct drm_crtc *crtc)
 
 struct drm_crtc *tilcdc_crtc_create(struct drm_device *dev)
 {
+        struct tilcdc_drm_private *priv = dev->dev_private;
         struct tilcdc_crtc *tilcdc_crtc;
         struct drm_crtc *crtc;
         int ret;
@@ -775,6 +777,24 @@ struct drm_crtc *tilcdc_crtc_create(struct drm_device *dev)
 
         drm_crtc_helper_add(crtc, &tilcdc_crtc_helper_funcs);
 
+        if (priv->is_componentized) {
+                struct device_node *ports =
+                        of_get_child_by_name(dev->dev->of_node, "ports");
+
+                if (ports) {
+                        crtc->port = of_get_child_by_name(ports, "port");
+                        of_node_put(ports);
+                } else {
+                        crtc->port =
+                                of_get_child_by_name(dev->dev->of_node, "port");
+                }
+                if (!crtc->port) { /* This should never happen */
+                        dev_err(dev->dev, "Port node not found in %s\n",
+                                dev->dev->of_node->full_name);
+                        goto fail;
+                }
+        }
+
         return crtc;
 
 fail: