[PATCH v4 21/22] drm/tilcdc: Initialize crtc->port

[Jyri Sarha]

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 at ti.com>
---
 drivers/gpu/drm/tilcdc/tilcdc_crtc.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/drivers/gpu/drm/tilcdc/tilcdc_crtc.c 
b/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
index 248e3ea..5f4da8c 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:
-- 
1.9.1