Commit | Line | Data |
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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> | |
1f2db303 | 6 | #include <drm/drm_bridge.h> |
7e435aad | 7 | #include <drm/drm_crtc.h> |
9338203c | 8 | #include <drm/drm_encoder.h> |
1f2db303 | 9 | #include <drm/drm_panel.h> |
7e435aad RK |
10 | #include <drm/drm_of.h> |
11 | ||
97ac0e47 RK |
12 | static void drm_release_of(struct device *dev, void *data) |
13 | { | |
14 | of_node_put(data); | |
15 | } | |
16 | ||
7e435aad RK |
17 | /** |
18 | * drm_crtc_port_mask - find the mask of a registered CRTC by port OF node | |
19 | * @dev: DRM device | |
20 | * @port: port OF node | |
21 | * | |
22 | * Given a port OF node, return the possible mask of the corresponding | |
23 | * CRTC within a device's list of CRTCs. Returns zero if not found. | |
24 | */ | |
25 | static uint32_t drm_crtc_port_mask(struct drm_device *dev, | |
26 | struct device_node *port) | |
27 | { | |
28 | unsigned int index = 0; | |
29 | struct drm_crtc *tmp; | |
30 | ||
6295d607 | 31 | drm_for_each_crtc(tmp, dev) { |
7e435aad RK |
32 | if (tmp->port == port) |
33 | return 1 << index; | |
34 | ||
35 | index++; | |
36 | } | |
37 | ||
38 | return 0; | |
39 | } | |
40 | ||
41 | /** | |
42 | * drm_of_find_possible_crtcs - find the possible CRTCs for an encoder port | |
43 | * @dev: DRM device | |
44 | * @port: encoder port to scan for endpoints | |
45 | * | |
46 | * Scan all endpoints attached to a port, locate their attached CRTCs, | |
47 | * and generate the DRM mask of CRTCs which may be attached to this | |
48 | * encoder. | |
49 | * | |
50 | * See Documentation/devicetree/bindings/graph.txt for the bindings. | |
51 | */ | |
52 | uint32_t drm_of_find_possible_crtcs(struct drm_device *dev, | |
53 | struct device_node *port) | |
54 | { | |
7416f4e3 | 55 | struct device_node *remote_port, *ep; |
7e435aad RK |
56 | uint32_t possible_crtcs = 0; |
57 | ||
7416f4e3 | 58 | for_each_endpoint_of_node(port, ep) { |
7e435aad RK |
59 | remote_port = of_graph_get_remote_port(ep); |
60 | if (!remote_port) { | |
61 | of_node_put(ep); | |
62 | return 0; | |
63 | } | |
64 | ||
65 | possible_crtcs |= drm_crtc_port_mask(dev, remote_port); | |
66 | ||
67 | of_node_put(remote_port); | |
7416f4e3 | 68 | } |
7e435aad RK |
69 | |
70 | return possible_crtcs; | |
71 | } | |
72 | EXPORT_SYMBOL(drm_of_find_possible_crtcs); | |
df785aa8 | 73 | |
97ac0e47 RK |
74 | /** |
75 | * drm_of_component_match_add - Add a component helper OF node match rule | |
76 | * @master: master device | |
77 | * @matchptr: component match pointer | |
78 | * @compare: compare function used for matching component | |
79 | * @node: of_node | |
80 | */ | |
81 | void drm_of_component_match_add(struct device *master, | |
82 | struct component_match **matchptr, | |
83 | int (*compare)(struct device *, void *), | |
84 | struct device_node *node) | |
85 | { | |
86 | of_node_get(node); | |
87 | component_match_add_release(master, matchptr, drm_release_of, | |
88 | compare, node); | |
89 | } | |
90 | EXPORT_SYMBOL_GPL(drm_of_component_match_add); | |
91 | ||
df785aa8 LD |
92 | /** |
93 | * drm_of_component_probe - Generic probe function for a component based master | |
94 | * @dev: master device containing the OF node | |
95 | * @compare_of: compare function used for matching components | |
96 | * @master_ops: component master ops to be used | |
97 | * | |
98 | * Parse the platform device OF node and bind all the components associated | |
99 | * with the master. Interface ports are added before the encoders in order to | |
100 | * satisfy their .bind requirements | |
101 | * See Documentation/devicetree/bindings/graph.txt for the bindings. | |
102 | * | |
103 | * Returns zero if successful, or one of the standard error codes if it fails. | |
104 | */ | |
105 | int drm_of_component_probe(struct device *dev, | |
106 | int (*compare_of)(struct device *, void *), | |
107 | const struct component_master_ops *m_ops) | |
108 | { | |
109 | struct device_node *ep, *port, *remote; | |
110 | struct component_match *match = NULL; | |
111 | int i; | |
112 | ||
113 | if (!dev->of_node) | |
114 | return -EINVAL; | |
115 | ||
116 | /* | |
117 | * Bind the crtc's ports first, so that drm_of_find_possible_crtcs() | |
118 | * called from encoder's .bind callbacks works as expected | |
119 | */ | |
120 | for (i = 0; ; i++) { | |
121 | port = of_parse_phandle(dev->of_node, "ports", i); | |
122 | if (!port) | |
123 | break; | |
124 | ||
125 | if (!of_device_is_available(port->parent)) { | |
126 | of_node_put(port); | |
127 | continue; | |
128 | } | |
129 | ||
97ac0e47 | 130 | drm_of_component_match_add(dev, &match, compare_of, port); |
df785aa8 LD |
131 | of_node_put(port); |
132 | } | |
133 | ||
134 | if (i == 0) { | |
135 | dev_err(dev, "missing 'ports' property\n"); | |
136 | return -ENODEV; | |
137 | } | |
138 | ||
139 | if (!match) { | |
140 | dev_err(dev, "no available port\n"); | |
141 | return -ENODEV; | |
142 | } | |
143 | ||
144 | /* | |
145 | * For bound crtcs, bind the encoders attached to their remote endpoint | |
146 | */ | |
147 | for (i = 0; ; i++) { | |
148 | port = of_parse_phandle(dev->of_node, "ports", i); | |
149 | if (!port) | |
150 | break; | |
151 | ||
152 | if (!of_device_is_available(port->parent)) { | |
153 | of_node_put(port); | |
154 | continue; | |
155 | } | |
156 | ||
157 | for_each_child_of_node(port, ep) { | |
158 | remote = of_graph_get_remote_port_parent(ep); | |
159 | if (!remote || !of_device_is_available(remote)) { | |
160 | of_node_put(remote); | |
161 | continue; | |
162 | } else if (!of_device_is_available(remote->parent)) { | |
4bf99144 RH |
163 | dev_warn(dev, "parent device of %pOF is not available\n", |
164 | remote); | |
df785aa8 LD |
165 | of_node_put(remote); |
166 | continue; | |
167 | } | |
168 | ||
97ac0e47 RK |
169 | drm_of_component_match_add(dev, &match, compare_of, |
170 | remote); | |
df785aa8 LD |
171 | of_node_put(remote); |
172 | } | |
173 | of_node_put(port); | |
174 | } | |
175 | ||
176 | return component_master_add_with_match(dev, m_ops, match); | |
177 | } | |
178 | EXPORT_SYMBOL(drm_of_component_probe); | |
4cacf91f PZ |
179 | |
180 | /* | |
181 | * drm_of_encoder_active_endpoint - return the active encoder endpoint | |
182 | * @node: device tree node containing encoder input ports | |
183 | * @encoder: drm_encoder | |
184 | * | |
185 | * Given an encoder device node and a drm_encoder with a connected crtc, | |
186 | * parse the encoder endpoint connecting to the crtc port. | |
187 | */ | |
188 | int drm_of_encoder_active_endpoint(struct device_node *node, | |
189 | struct drm_encoder *encoder, | |
190 | struct of_endpoint *endpoint) | |
191 | { | |
192 | struct device_node *ep; | |
193 | struct drm_crtc *crtc = encoder->crtc; | |
194 | struct device_node *port; | |
195 | int ret; | |
196 | ||
197 | if (!node || !crtc) | |
198 | return -EINVAL; | |
199 | ||
200 | for_each_endpoint_of_node(node, ep) { | |
201 | port = of_graph_get_remote_port(ep); | |
202 | of_node_put(port); | |
203 | if (port == crtc->port) { | |
204 | ret = of_graph_parse_endpoint(ep, endpoint); | |
205 | of_node_put(ep); | |
206 | return ret; | |
207 | } | |
208 | } | |
209 | ||
210 | return -EINVAL; | |
211 | } | |
212 | EXPORT_SYMBOL_GPL(drm_of_encoder_active_endpoint); | |
1f2db303 RH |
213 | |
214 | /* | |
215 | * drm_of_find_panel_or_bridge - return connected panel or bridge device | |
216 | * @np: device tree node containing encoder output ports | |
217 | * @panel: pointer to hold returned drm_panel | |
218 | * @bridge: pointer to hold returned drm_bridge | |
219 | * | |
220 | * Given a DT node's port and endpoint number, find the connected node and | |
221 | * return either the associated struct drm_panel or drm_bridge device. Either | |
222 | * @panel or @bridge must not be NULL. | |
223 | * | |
224 | * Returns zero if successful, or one of the standard error codes if it fails. | |
225 | */ | |
226 | int drm_of_find_panel_or_bridge(const struct device_node *np, | |
227 | int port, int endpoint, | |
228 | struct drm_panel **panel, | |
229 | struct drm_bridge **bridge) | |
230 | { | |
231 | int ret = -EPROBE_DEFER; | |
232 | struct device_node *remote; | |
233 | ||
234 | if (!panel && !bridge) | |
235 | return -EINVAL; | |
320e421e DC |
236 | if (panel) |
237 | *panel = NULL; | |
1f2db303 RH |
238 | |
239 | remote = of_graph_get_remote_node(np, port, endpoint); | |
240 | if (!remote) | |
241 | return -ENODEV; | |
242 | ||
243 | if (panel) { | |
244 | *panel = of_drm_find_panel(remote); | |
245 | if (*panel) | |
246 | ret = 0; | |
247 | } | |
248 | ||
249 | /* No panel found yet, check for a bridge next. */ | |
250 | if (bridge) { | |
251 | if (ret) { | |
252 | *bridge = of_drm_find_bridge(remote); | |
253 | if (*bridge) | |
254 | ret = 0; | |
255 | } else { | |
256 | *bridge = NULL; | |
257 | } | |
258 | ||
259 | } | |
260 | ||
261 | of_node_put(remote); | |
262 | return ret; | |
263 | } | |
264 | EXPORT_SYMBOL_GPL(drm_of_find_panel_or_bridge); |