From d635711daa98be86d4c7fd01499c34f566b54ccb Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Fri, 10 Jun 2016 05:30:17 -0300 Subject: Linux-libre 4.6.2-gnu --- drivers/gpu/drm/drm_of.c | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) (limited to 'drivers/gpu/drm/drm_of.c') diff --git a/drivers/gpu/drm/drm_of.c b/drivers/gpu/drm/drm_of.c index 493c05c9c..bc98bb942 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); -- cgit v1.2.3-54-g00ecf