blob: 2120f33bdf4a4f21d9fc7d89577818193f30020e [file] [log] [blame]
Liviu Dudaudf785aa2015-10-20 10:23:12 +01001#include <linux/component.h>
Russell King7e435aa2014-06-15 11:07:12 +01002#include <linux/export.h>
3#include <linux/list.h>
4#include <linux/of_graph.h>
5#include <drm/drmP.h>
Rob Herring1f2db302017-03-22 08:26:05 -05006#include <drm/drm_bridge.h>
Russell King7e435aa2014-06-15 11:07:12 +01007#include <drm/drm_crtc.h>
Laurent Pinchart93382032016-11-28 20:51:09 +02008#include <drm/drm_encoder.h>
Rob Herring1f2db302017-03-22 08:26:05 -05009#include <drm/drm_panel.h>
Russell King7e435aa2014-06-15 11:07:12 +010010#include <drm/drm_of.h>
11
Russell King97ac0e42016-10-19 11:28:27 +010012static void drm_release_of(struct device *dev, void *data)
13{
14 of_node_put(data);
15}
16
Russell King7e435aa2014-06-15 11:07:12 +010017/**
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 */
25static 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
Daniel Vetter6295d602015-07-09 23:44:25 +020031 drm_for_each_crtc(tmp, dev) {
Russell King7e435aa2014-06-15 11:07:12 +010032 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 */
52uint32_t drm_of_find_possible_crtcs(struct drm_device *dev,
53 struct device_node *port)
54{
Philipp Zabel7416f4e2014-07-03 22:59:51 +020055 struct device_node *remote_port, *ep;
Russell King7e435aa2014-06-15 11:07:12 +010056 uint32_t possible_crtcs = 0;
57
Philipp Zabel7416f4e2014-07-03 22:59:51 +020058 for_each_endpoint_of_node(port, ep) {
Russell King7e435aa2014-06-15 11:07:12 +010059 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);
Philipp Zabel7416f4e2014-07-03 22:59:51 +020068 }
Russell King7e435aa2014-06-15 11:07:12 +010069
70 return possible_crtcs;
71}
72EXPORT_SYMBOL(drm_of_find_possible_crtcs);
Liviu Dudaudf785aa2015-10-20 10:23:12 +010073
74/**
Russell King97ac0e42016-10-19 11:28:27 +010075 * 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 */
81void 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}
90EXPORT_SYMBOL_GPL(drm_of_component_match_add);
91
92/**
Liviu Dudaudf785aa2015-10-20 10:23:12 +010093 * 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 */
105int 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
Russell King97ac0e42016-10-19 11:28:27 +0100130 drm_of_component_match_add(dev, &match, compare_of, port);
Liviu Dudaudf785aa2015-10-20 10:23:12 +0100131 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)) {
163 dev_warn(dev, "parent device of %s is not available\n",
164 remote->full_name);
165 of_node_put(remote);
166 continue;
167 }
168
Russell King97ac0e42016-10-19 11:28:27 +0100169 drm_of_component_match_add(dev, &match, compare_of,
170 remote);
Liviu Dudaudf785aa2015-10-20 10:23:12 +0100171 of_node_put(remote);
172 }
173 of_node_put(port);
174 }
175
176 return component_master_add_with_match(dev, m_ops, match);
177}
178EXPORT_SYMBOL(drm_of_component_probe);
Philipp Zabel4cacf912015-02-24 11:34:01 +0100179
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 */
188int 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}
212EXPORT_SYMBOL_GPL(drm_of_encoder_active_endpoint);
Rob Herring1f2db302017-03-22 08:26:05 -0500213
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 */
226int 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;
236
237 remote = of_graph_get_remote_node(np, port, endpoint);
238 if (!remote)
239 return -ENODEV;
240
241 if (panel) {
242 *panel = of_drm_find_panel(remote);
243 if (*panel)
244 ret = 0;
245 }
246
247 /* No panel found yet, check for a bridge next. */
248 if (bridge) {
249 if (ret) {
250 *bridge = of_drm_find_bridge(remote);
251 if (*bridge)
252 ret = 0;
253 } else {
254 *bridge = NULL;
255 }
256
257 }
258
259 of_node_put(remote);
260 return ret;
261}
262EXPORT_SYMBOL_GPL(drm_of_find_panel_or_bridge);