From 812070eb090350af69848f462fe5266e25c5df6e Mon Sep 17 00:00:00 2001 From: Archit Taneja Date: Thu, 19 May 2016 10:38:39 +0530 Subject: [PATCH] drm/msm: Add display components by parsing MDP ports The kms driver currently identifies all the mdss components it needs by parsing a phandle list from the 'connectors' DT property. Instead of this, describe a list of ports that the MDP hardware provides to the external world. These ports are linked to external encoder interfaces such as DSI, HDMI. These are also the subcomponent devices that we need add. This description of ports complies with the generic graph bindings. The LVDS port is a special case since it is a part of MDP4 itself, and its output connects directly to the LVDS panel. In this case, we don't try to add it as a component. Signed-off-by: Archit Taneja Signed-off-by: Rob Clark --- drivers/gpu/drm/msm/msm_drv.c | 56 ++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 55 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c index 132c813..73510d0c 100644 --- a/drivers/gpu/drm/msm/msm_drv.c +++ b/drivers/gpu/drm/msm/msm_drv.c @@ -823,10 +823,64 @@ static int add_components(struct device *dev, struct component_match **matchptr, return 0; } +/* + * Identify what components need to be added by parsing what remote-endpoints + * our MDP output ports are connected to. In the case of LVDS on MDP4, there + * is no external component that we need to add since LVDS is within MDP4 + * itself. + */ +static int add_components_mdp(struct device *mdp_dev, + struct component_match **matchptr) +{ + struct device_node *np = mdp_dev->of_node; + struct device_node *ep_node; + + for_each_endpoint_of_node(np, ep_node) { + struct device_node *intf; + struct of_endpoint ep; + int ret; + + ret = of_graph_parse_endpoint(ep_node, &ep); + if (ret) { + dev_err(mdp_dev, "unable to parse port endpoint\n"); + of_node_put(ep_node); + return ret; + } + + /* + * The LCDC/LVDS port on MDP4 is a speacial case where the + * remote-endpoint isn't a component that we need to add + */ + if (of_device_is_compatible(np, "qcom,mdp4") && + ep.port == 0) { + of_node_put(ep_node); + continue; + } + + /* + * It's okay if some of the ports don't have a remote endpoint + * specified. It just means that the port isn't connected to + * any external interface. + */ + intf = of_graph_get_remote_port_parent(ep_node); + if (!intf) { + of_node_put(ep_node); + continue; + } + + component_match_add(mdp_dev, matchptr, compare_of, intf); + + of_node_put(intf); + of_node_put(ep_node); + } + + return 0; +} + static int add_display_components(struct device *dev, struct component_match **matchptr) { - return add_components(dev, matchptr, "connectors"); + return add_components_mdp(dev, matchptr); } static int add_gpu_components(struct device *dev, -- 2.7.4