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df785aa8 | 1 | #include <linux/component.h> |
7e435aad RK |
2 | #include <linux/export.h> |
3 | #include <linux/list.h> | |
4 | #include <linux/of_graph.h> | |
5 | #include <drm/drmP.h> | |
6 | #include <drm/drm_crtc.h> | |
7 | #include <drm/drm_of.h> | |
8 | ||
9 | /** | |
10 | * drm_crtc_port_mask - find the mask of a registered CRTC by port OF node | |
11 | * @dev: DRM device | |
12 | * @port: port OF node | |
13 | * | |
14 | * Given a port OF node, return the possible mask of the corresponding | |
15 | * CRTC within a device's list of CRTCs. Returns zero if not found. | |
16 | */ | |
17 | static uint32_t drm_crtc_port_mask(struct drm_device *dev, | |
18 | struct device_node *port) | |
19 | { | |
20 | unsigned int index = 0; | |
21 | struct drm_crtc *tmp; | |
22 | ||
6295d607 | 23 | drm_for_each_crtc(tmp, dev) { |
7e435aad RK |
24 | if (tmp->port == port) |
25 | return 1 << index; | |
26 | ||
27 | index++; | |
28 | } | |
29 | ||
30 | return 0; | |
31 | } | |
32 | ||
33 | /** | |
34 | * drm_of_find_possible_crtcs - find the possible CRTCs for an encoder port | |
35 | * @dev: DRM device | |
36 | * @port: encoder port to scan for endpoints | |
37 | * | |
38 | * Scan all endpoints attached to a port, locate their attached CRTCs, | |
39 | * and generate the DRM mask of CRTCs which may be attached to this | |
40 | * encoder. | |
41 | * | |
42 | * See Documentation/devicetree/bindings/graph.txt for the bindings. | |
43 | */ | |
44 | uint32_t drm_of_find_possible_crtcs(struct drm_device *dev, | |
45 | struct device_node *port) | |
46 | { | |
7416f4e3 | 47 | struct device_node *remote_port, *ep; |
7e435aad RK |
48 | uint32_t possible_crtcs = 0; |
49 | ||
7416f4e3 | 50 | for_each_endpoint_of_node(port, ep) { |
7e435aad RK |
51 | remote_port = of_graph_get_remote_port(ep); |
52 | if (!remote_port) { | |
53 | of_node_put(ep); | |
54 | return 0; | |
55 | } | |
56 | ||
57 | possible_crtcs |= drm_crtc_port_mask(dev, remote_port); | |
58 | ||
59 | of_node_put(remote_port); | |
7416f4e3 | 60 | } |
7e435aad RK |
61 | |
62 | return possible_crtcs; | |
63 | } | |
64 | EXPORT_SYMBOL(drm_of_find_possible_crtcs); | |
df785aa8 LD |
65 | |
66 | /** | |
67 | * drm_of_component_probe - Generic probe function for a component based master | |
68 | * @dev: master device containing the OF node | |
69 | * @compare_of: compare function used for matching components | |
70 | * @master_ops: component master ops to be used | |
71 | * | |
72 | * Parse the platform device OF node and bind all the components associated | |
73 | * with the master. Interface ports are added before the encoders in order to | |
74 | * satisfy their .bind requirements | |
75 | * See Documentation/devicetree/bindings/graph.txt for the bindings. | |
76 | * | |
77 | * Returns zero if successful, or one of the standard error codes if it fails. | |
78 | */ | |
79 | int drm_of_component_probe(struct device *dev, | |
80 | int (*compare_of)(struct device *, void *), | |
81 | const struct component_master_ops *m_ops) | |
82 | { | |
83 | struct device_node *ep, *port, *remote; | |
84 | struct component_match *match = NULL; | |
85 | int i; | |
86 | ||
87 | if (!dev->of_node) | |
88 | return -EINVAL; | |
89 | ||
90 | /* | |
91 | * Bind the crtc's ports first, so that drm_of_find_possible_crtcs() | |
92 | * called from encoder's .bind callbacks works as expected | |
93 | */ | |
94 | for (i = 0; ; i++) { | |
95 | port = of_parse_phandle(dev->of_node, "ports", i); | |
96 | if (!port) | |
97 | break; | |
98 | ||
99 | if (!of_device_is_available(port->parent)) { | |
100 | of_node_put(port); | |
101 | continue; | |
102 | } | |
103 | ||
104 | component_match_add(dev, &match, compare_of, port); | |
105 | of_node_put(port); | |
106 | } | |
107 | ||
108 | if (i == 0) { | |
109 | dev_err(dev, "missing 'ports' property\n"); | |
110 | return -ENODEV; | |
111 | } | |
112 | ||
113 | if (!match) { | |
114 | dev_err(dev, "no available port\n"); | |
115 | return -ENODEV; | |
116 | } | |
117 | ||
118 | /* | |
119 | * For bound crtcs, bind the encoders attached to their remote endpoint | |
120 | */ | |
121 | for (i = 0; ; i++) { | |
122 | port = of_parse_phandle(dev->of_node, "ports", i); | |
123 | if (!port) | |
124 | break; | |
125 | ||
126 | if (!of_device_is_available(port->parent)) { | |
127 | of_node_put(port); | |
128 | continue; | |
129 | } | |
130 | ||
131 | for_each_child_of_node(port, ep) { | |
132 | remote = of_graph_get_remote_port_parent(ep); | |
133 | if (!remote || !of_device_is_available(remote)) { | |
134 | of_node_put(remote); | |
135 | continue; | |
136 | } else if (!of_device_is_available(remote->parent)) { | |
137 | dev_warn(dev, "parent device of %s is not available\n", | |
138 | remote->full_name); | |
139 | of_node_put(remote); | |
140 | continue; | |
141 | } | |
142 | ||
143 | component_match_add(dev, &match, compare_of, remote); | |
144 | of_node_put(remote); | |
145 | } | |
146 | of_node_put(port); | |
147 | } | |
148 | ||
149 | return component_master_add_with_match(dev, m_ops, match); | |
150 | } | |
151 | EXPORT_SYMBOL(drm_of_component_probe); | |
4cacf91f PZ |
152 | |
153 | /* | |
154 | * drm_of_encoder_active_endpoint - return the active encoder endpoint | |
155 | * @node: device tree node containing encoder input ports | |
156 | * @encoder: drm_encoder | |
157 | * | |
158 | * Given an encoder device node and a drm_encoder with a connected crtc, | |
159 | * parse the encoder endpoint connecting to the crtc port. | |
160 | */ | |
161 | int drm_of_encoder_active_endpoint(struct device_node *node, | |
162 | struct drm_encoder *encoder, | |
163 | struct of_endpoint *endpoint) | |
164 | { | |
165 | struct device_node *ep; | |
166 | struct drm_crtc *crtc = encoder->crtc; | |
167 | struct device_node *port; | |
168 | int ret; | |
169 | ||
170 | if (!node || !crtc) | |
171 | return -EINVAL; | |
172 | ||
173 | for_each_endpoint_of_node(node, ep) { | |
174 | port = of_graph_get_remote_port(ep); | |
175 | of_node_put(port); | |
176 | if (port == crtc->port) { | |
177 | ret = of_graph_parse_endpoint(ep, endpoint); | |
178 | of_node_put(ep); | |
179 | return ret; | |
180 | } | |
181 | } | |
182 | ||
183 | return -EINVAL; | |
184 | } | |
185 | EXPORT_SYMBOL_GPL(drm_of_encoder_active_endpoint); |