400 lines
11 KiB
C
400 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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#include <linux/component.h>
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#include <linux/export.h>
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#include <linux/list.h>
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#include <linux/of_graph.h>
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#include <drm/drm_bridge.h>
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#include <drm/drm_crtc.h>
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#include <drm/drm_device.h>
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#include <drm/drm_encoder.h>
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#include <drm/drm_of.h>
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#include <drm/drm_panel.h>
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/**
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* DOC: overview
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*
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* A set of helper functions to aid DRM drivers in parsing standard DT
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* properties.
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*/
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static void drm_release_of(struct device *dev, void *data)
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{
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of_node_put(data);
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}
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/**
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* drm_of_crtc_port_mask - find the mask of a registered CRTC by port OF node
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* @dev: DRM device
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* @port: port OF node
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*
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* Given a port OF node, return the possible mask of the corresponding
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* CRTC within a device's list of CRTCs. Returns zero if not found.
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*/
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uint32_t drm_of_crtc_port_mask(struct drm_device *dev,
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struct device_node *port)
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{
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unsigned int index = 0;
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struct drm_crtc *tmp;
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drm_for_each_crtc(tmp, dev) {
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if (tmp->port == port)
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return 1 << index;
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index++;
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}
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return 0;
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}
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EXPORT_SYMBOL(drm_of_crtc_port_mask);
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/**
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* drm_of_find_possible_crtcs - find the possible CRTCs for an encoder port
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* @dev: DRM device
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* @port: encoder port to scan for endpoints
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*
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* Scan all endpoints attached to a port, locate their attached CRTCs,
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* and generate the DRM mask of CRTCs which may be attached to this
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* encoder.
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*
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* See Documentation/devicetree/bindings/graph.txt for the bindings.
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*/
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uint32_t drm_of_find_possible_crtcs(struct drm_device *dev,
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struct device_node *port)
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{
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struct device_node *remote_port, *ep;
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uint32_t possible_crtcs = 0;
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for_each_endpoint_of_node(port, ep) {
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remote_port = of_graph_get_remote_port(ep);
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if (!remote_port) {
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of_node_put(ep);
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return 0;
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}
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possible_crtcs |= drm_of_crtc_port_mask(dev, remote_port);
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of_node_put(remote_port);
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}
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return possible_crtcs;
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}
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EXPORT_SYMBOL(drm_of_find_possible_crtcs);
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/**
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* drm_of_component_match_add - Add a component helper OF node match rule
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* @master: master device
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* @matchptr: component match pointer
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* @compare: compare function used for matching component
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* @node: of_node
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*/
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void drm_of_component_match_add(struct device *master,
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struct component_match **matchptr,
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int (*compare)(struct device *, void *),
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struct device_node *node)
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{
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of_node_get(node);
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component_match_add_release(master, matchptr, drm_release_of,
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compare, node);
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}
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EXPORT_SYMBOL_GPL(drm_of_component_match_add);
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/**
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* drm_of_component_probe - Generic probe function for a component based master
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* @dev: master device containing the OF node
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* @compare_of: compare function used for matching components
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* @m_ops: component master ops to be used
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*
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* Parse the platform device OF node and bind all the components associated
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* with the master. Interface ports are added before the encoders in order to
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* satisfy their .bind requirements
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* See Documentation/devicetree/bindings/graph.txt for the bindings.
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*
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* Returns zero if successful, or one of the standard error codes if it fails.
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*/
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int drm_of_component_probe(struct device *dev,
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int (*compare_of)(struct device *, void *),
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const struct component_master_ops *m_ops)
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{
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struct device_node *ep, *port, *remote;
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struct component_match *match = NULL;
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int i;
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if (!dev->of_node)
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return -EINVAL;
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/*
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* Bind the crtc's ports first, so that drm_of_find_possible_crtcs()
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* called from encoder's .bind callbacks works as expected
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*/
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for (i = 0; ; i++) {
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port = of_parse_phandle(dev->of_node, "ports", i);
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if (!port)
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break;
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if (of_device_is_available(port->parent))
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drm_of_component_match_add(dev, &match, compare_of,
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port);
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of_node_put(port);
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}
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if (i == 0) {
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dev_err(dev, "missing 'ports' property\n");
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return -ENODEV;
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}
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if (!match) {
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dev_err(dev, "no available port\n");
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return -ENODEV;
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}
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/*
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* For bound crtcs, bind the encoders attached to their remote endpoint
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*/
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for (i = 0; ; i++) {
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port = of_parse_phandle(dev->of_node, "ports", i);
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if (!port)
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break;
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if (!of_device_is_available(port->parent)) {
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of_node_put(port);
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continue;
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}
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for_each_child_of_node(port, ep) {
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remote = of_graph_get_remote_port_parent(ep);
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if (!remote || !of_device_is_available(remote)) {
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of_node_put(remote);
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continue;
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} else if (!of_device_is_available(remote->parent)) {
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dev_warn(dev, "parent device of %pOF is not available\n",
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remote);
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of_node_put(remote);
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continue;
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}
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drm_of_component_match_add(dev, &match, compare_of,
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remote);
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of_node_put(remote);
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}
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of_node_put(port);
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}
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return component_master_add_with_match(dev, m_ops, match);
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}
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EXPORT_SYMBOL(drm_of_component_probe);
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/*
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* drm_of_encoder_active_endpoint - return the active encoder endpoint
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* @node: device tree node containing encoder input ports
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* @encoder: drm_encoder
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*
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* Given an encoder device node and a drm_encoder with a connected crtc,
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* parse the encoder endpoint connecting to the crtc port.
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*/
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int drm_of_encoder_active_endpoint(struct device_node *node,
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struct drm_encoder *encoder,
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struct of_endpoint *endpoint)
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{
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struct device_node *ep;
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struct drm_crtc *crtc = encoder->crtc;
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struct device_node *port;
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int ret;
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if (!node || !crtc)
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return -EINVAL;
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for_each_endpoint_of_node(node, ep) {
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port = of_graph_get_remote_port(ep);
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of_node_put(port);
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if (port == crtc->port) {
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ret = of_graph_parse_endpoint(ep, endpoint);
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of_node_put(ep);
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return ret;
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}
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}
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return -EINVAL;
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}
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EXPORT_SYMBOL_GPL(drm_of_encoder_active_endpoint);
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/**
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* drm_of_find_panel_or_bridge - return connected panel or bridge device
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* @np: device tree node containing encoder output ports
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* @port: port in the device tree node
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* @endpoint: endpoint in the device tree node
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* @panel: pointer to hold returned drm_panel
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* @bridge: pointer to hold returned drm_bridge
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*
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* Given a DT node's port and endpoint number, find the connected node and
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* return either the associated struct drm_panel or drm_bridge device. Either
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* @panel or @bridge must not be NULL.
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*
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* Returns zero if successful, or one of the standard error codes if it fails.
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*/
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int drm_of_find_panel_or_bridge(const struct device_node *np,
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int port, int endpoint,
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struct drm_panel **panel,
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struct drm_bridge **bridge)
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{
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int ret = -EPROBE_DEFER;
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struct device_node *remote;
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if (!panel && !bridge)
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return -EINVAL;
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if (panel)
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*panel = NULL;
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/*
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* of_graph_get_remote_node() produces a noisy error message if port
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* node isn't found and the absence of the port is a legit case here,
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* so at first we silently check whether graph presents in the
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* device-tree node.
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*/
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if (!of_graph_is_present(np))
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return -ENODEV;
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remote = of_graph_get_remote_node(np, port, endpoint);
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if (!remote)
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return -ENODEV;
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if (panel) {
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*panel = of_drm_find_panel(remote);
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if (!IS_ERR(*panel))
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ret = 0;
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else
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*panel = NULL;
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}
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/* No panel found yet, check for a bridge next. */
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if (bridge) {
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if (ret) {
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*bridge = of_drm_find_bridge(remote);
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if (*bridge)
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ret = 0;
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} else {
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*bridge = NULL;
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}
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}
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of_node_put(remote);
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return ret;
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}
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EXPORT_SYMBOL_GPL(drm_of_find_panel_or_bridge);
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enum drm_of_lvds_pixels {
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DRM_OF_LVDS_EVEN = BIT(0),
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DRM_OF_LVDS_ODD = BIT(1),
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};
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static int drm_of_lvds_get_port_pixels_type(struct device_node *port_node)
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{
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bool even_pixels =
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of_property_read_bool(port_node, "dual-lvds-even-pixels");
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bool odd_pixels =
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of_property_read_bool(port_node, "dual-lvds-odd-pixels");
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return (even_pixels ? DRM_OF_LVDS_EVEN : 0) |
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(odd_pixels ? DRM_OF_LVDS_ODD : 0);
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}
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static int drm_of_lvds_get_remote_pixels_type(
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const struct device_node *port_node)
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{
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struct device_node *endpoint = NULL;
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int pixels_type = -EPIPE;
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for_each_child_of_node(port_node, endpoint) {
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struct device_node *remote_port;
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int current_pt;
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if (!of_node_name_eq(endpoint, "endpoint"))
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continue;
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remote_port = of_graph_get_remote_port(endpoint);
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if (!remote_port) {
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of_node_put(remote_port);
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return -EPIPE;
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}
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current_pt = drm_of_lvds_get_port_pixels_type(remote_port);
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of_node_put(remote_port);
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if (pixels_type < 0)
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pixels_type = current_pt;
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/*
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* Sanity check, ensure that all remote endpoints have the same
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* pixel type. We may lift this restriction later if we need to
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* support multiple sinks with different dual-link
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* configurations by passing the endpoints explicitly to
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* drm_of_lvds_get_dual_link_pixel_order().
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*/
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if (!current_pt || pixels_type != current_pt)
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return -EINVAL;
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}
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return pixels_type;
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}
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/**
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* drm_of_lvds_get_dual_link_pixel_order - Get LVDS dual-link pixel order
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* @port1: First DT port node of the Dual-link LVDS source
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* @port2: Second DT port node of the Dual-link LVDS source
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*
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* An LVDS dual-link connection is made of two links, with even pixels
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* transitting on one link, and odd pixels on the other link. This function
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* returns, for two ports of an LVDS dual-link source, which port shall transmit
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* the even and odd pixels, based on the requirements of the connected sink.
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*
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* The pixel order is determined from the dual-lvds-even-pixels and
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* dual-lvds-odd-pixels properties in the sink's DT port nodes. If those
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* properties are not present, or if their usage is not valid, this function
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* returns -EINVAL.
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*
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* If either port is not connected, this function returns -EPIPE.
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*
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* @port1 and @port2 are typically DT sibling nodes, but may have different
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* parents when, for instance, two separate LVDS encoders carry the even and odd
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* pixels.
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*
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* Return:
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* * DRM_LVDS_DUAL_LINK_EVEN_ODD_PIXELS - @port1 carries even pixels and @port2
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* carries odd pixels
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* * DRM_LVDS_DUAL_LINK_ODD_EVEN_PIXELS - @port1 carries odd pixels and @port2
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* carries even pixels
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* * -EINVAL - @port1 and @port2 are not connected to a dual-link LVDS sink, or
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* the sink configuration is invalid
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* * -EPIPE - when @port1 or @port2 are not connected
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*/
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int drm_of_lvds_get_dual_link_pixel_order(const struct device_node *port1,
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const struct device_node *port2)
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{
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int remote_p1_pt, remote_p2_pt;
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if (!port1 || !port2)
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return -EINVAL;
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remote_p1_pt = drm_of_lvds_get_remote_pixels_type(port1);
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if (remote_p1_pt < 0)
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return remote_p1_pt;
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remote_p2_pt = drm_of_lvds_get_remote_pixels_type(port2);
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if (remote_p2_pt < 0)
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return remote_p2_pt;
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/*
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* A valid dual-lVDS bus is found when one remote port is marked with
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* "dual-lvds-even-pixels", and the other remote port is marked with
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* "dual-lvds-odd-pixels", bail out if the markers are not right.
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*/
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if (remote_p1_pt + remote_p2_pt != DRM_OF_LVDS_EVEN + DRM_OF_LVDS_ODD)
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return -EINVAL;
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return remote_p1_pt == DRM_OF_LVDS_EVEN ?
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DRM_LVDS_DUAL_LINK_EVEN_ODD_PIXELS :
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DRM_LVDS_DUAL_LINK_ODD_EVEN_PIXELS;
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}
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EXPORT_SYMBOL_GPL(drm_of_lvds_get_dual_link_pixel_order);
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