diff options
| -rw-r--r-- | drivers/gpu/drm/drm_of.c | 34 | ||||
| -rw-r--r-- | include/drm/drm_of.h | 33 |
2 files changed, 67 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_of.c b/drivers/gpu/drm/drm_of.c index 493c05c9ce4f..bc98bb94264d 100644 --- a/drivers/gpu/drm/drm_of.c +++ b/drivers/gpu/drm/drm_of.c @@ -149,3 +149,37 @@ int drm_of_component_probe(struct device *dev, return component_master_add_with_match(dev, m_ops, match); } EXPORT_SYMBOL(drm_of_component_probe); + +/* + * drm_of_encoder_active_endpoint - return the active encoder endpoint + * @node: device tree node containing encoder input ports + * @encoder: drm_encoder + * + * Given an encoder device node and a drm_encoder with a connected crtc, + * parse the encoder endpoint connecting to the crtc port. + */ +int drm_of_encoder_active_endpoint(struct device_node *node, + struct drm_encoder *encoder, + struct of_endpoint *endpoint) +{ + struct device_node *ep; + struct drm_crtc *crtc = encoder->crtc; + struct device_node *port; + int ret; + + if (!node || !crtc) + return -EINVAL; + + for_each_endpoint_of_node(node, ep) { + port = of_graph_get_remote_port(ep); + of_node_put(port); + if (port == crtc->port) { + ret = of_graph_parse_endpoint(ep, endpoint); + of_node_put(ep); + return ret; + } + } + + return -EINVAL; +} +EXPORT_SYMBOL_GPL(drm_of_encoder_active_endpoint); diff --git a/include/drm/drm_of.h b/include/drm/drm_of.h index 8544665ee4f4..3fd87b386ed7 100644 --- a/include/drm/drm_of.h +++ b/include/drm/drm_of.h @@ -1,9 +1,12 @@ #ifndef __DRM_OF_H__ #define __DRM_OF_H__ +#include <linux/of_graph.h> + struct component_master_ops; struct device; struct drm_device; +struct drm_encoder; struct device_node; #ifdef CONFIG_OF @@ -12,6 +15,9 @@ extern uint32_t drm_of_find_possible_crtcs(struct drm_device *dev, extern int drm_of_component_probe(struct device *dev, int (*compare_of)(struct device *, void *), const struct component_master_ops *m_ops); +extern int drm_of_encoder_active_endpoint(struct device_node *node, + struct drm_encoder *encoder, + struct of_endpoint *endpoint); #else static inline uint32_t drm_of_find_possible_crtcs(struct drm_device *dev, struct device_node *port) @@ -26,6 +32,33 @@ drm_of_component_probe(struct device *dev, { return -EINVAL; } + +static inline int drm_of_encoder_active_endpoint(struct device_node *node, + struct drm_encoder *encoder, + struct of_endpoint *endpoint) +{ + return -EINVAL; +} #endif +static inline int drm_of_encoder_active_endpoint_id(struct device_node *node, + struct drm_encoder *encoder) +{ + struct of_endpoint endpoint; + int ret = drm_of_encoder_active_endpoint(node, encoder, + &endpoint); + + return ret ?: endpoint.id; +} + +static inline int drm_of_encoder_active_port_id(struct device_node *node, + struct drm_encoder *encoder) +{ + struct of_endpoint endpoint; + int ret = drm_of_encoder_active_endpoint(node, encoder, + &endpoint); + + return ret ?: endpoint.port; +} + #endif /* __DRM_OF_H__ */ |