summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/drm_of.c
blob: 2763a5ec845b0c14bff58b8aed4d8cb58d80d0a9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
#include <linux/component.h>
#include <linux/export.h>
#include <linux/list.h>
#include <linux/of_graph.h>
#include <drm/drmP.h>
#include <drm/drm_bridge.h>
#include <drm/drm_crtc.h>
#include <drm/drm_encoder.h>
#include <drm/drm_panel.h>
#include <drm/drm_of.h>

/**
 * DOC: overview
 *
 * A set of helper functions to aid DRM drivers in parsing standard DT
 * properties.
 */

static void drm_release_of(struct device *dev, void *data)
{
	of_node_put(data);
}

/**
 * drm_of_crtc_port_mask - find the mask of a registered CRTC by port OF node
 * @dev: DRM device
 * @port: port OF node
 *
 * Given a port OF node, return the possible mask of the corresponding
 * CRTC within a device's list of CRTCs.  Returns zero if not found.
 */
uint32_t drm_of_crtc_port_mask(struct drm_device *dev,
			    struct device_node *port)
{
	unsigned int index = 0;
	struct drm_crtc *tmp;

	drm_for_each_crtc(tmp, dev) {
		if (tmp->port == port)
			return 1 << index;

		index++;
	}

	return 0;
}
EXPORT_SYMBOL(drm_of_crtc_port_mask);

/**
 * drm_of_find_possible_crtcs - find the possible CRTCs for an encoder port
 * @dev: DRM device
 * @port: encoder port to scan for endpoints
 *
 * Scan all endpoints attached to a port, locate their attached CRTCs,
 * and generate the DRM mask of CRTCs which may be attached to this
 * encoder.
 *
 * See Documentation/devicetree/bindings/graph.txt for the bindings.
 */
uint32_t drm_of_find_possible_crtcs(struct drm_device *dev,
				    struct device_node *port)
{
	struct device_node *remote_port, *ep;
	uint32_t possible_crtcs = 0;

	for_each_endpoint_of_node(port, ep) {
		remote_port = of_graph_get_remote_port(ep);
		if (!remote_port) {
			of_node_put(ep);
			return 0;
		}

		possible_crtcs |= drm_of_crtc_port_mask(dev, remote_port);

		of_node_put(remote_port);
	}

	return possible_crtcs;
}
EXPORT_SYMBOL(drm_of_find_possible_crtcs);

/**
 * drm_of_component_match_add - Add a component helper OF node match rule
 * @master: master device
 * @matchptr: component match pointer
 * @compare: compare function used for matching component
 * @node: of_node
 */
void drm_of_component_match_add(struct device *master,
				struct component_match **matchptr,
				int (*compare)(struct device *, void *),
				struct device_node *node)
{
	of_node_get(node);
	component_match_add_release(master, matchptr, drm_release_of,
				    compare, node);
}
EXPORT_SYMBOL_GPL(drm_of_component_match_add);

/**
 * drm_of_component_probe - Generic probe function for a component based master
 * @dev: master device containing the OF node
 * @compare_of: compare function used for matching components
 * @m_ops: component master ops to be used
 *
 * Parse the platform device OF node and bind all the components associated
 * with the master. Interface ports are added before the encoders in order to
 * satisfy their .bind requirements
 * See Documentation/devicetree/bindings/graph.txt for the bindings.
 *
 * Returns zero if successful, or one of the standard error codes if it fails.
 */
int drm_of_component_probe(struct device *dev,
			   int (*compare_of)(struct device *, void *),
			   const struct component_master_ops *m_ops)
{
	struct device_node *ep, *port, *remote;
	struct component_match *match = NULL;
	int i;

	if (!dev->of_node)
		return -EINVAL;

	/*
	 * Bind the crtc's ports first, so that drm_of_find_possible_crtcs()
	 * called from encoder's .bind callbacks works as expected
	 */
	for (i = 0; ; i++) {
		port = of_parse_phandle(dev->of_node, "ports", i);
		if (!port)
			break;

		if (of_device_is_available(port->parent))
			drm_of_component_match_add(dev, &match, compare_of,
						   port);

		of_node_put(port);
	}

	if (i == 0) {
		dev_err(dev, "missing 'ports' property\n");
		return -ENODEV;
	}

	if (!match) {
		dev_err(dev, "no available port\n");
		return -ENODEV;
	}

	/*
	 * For bound crtcs, bind the encoders attached to their remote endpoint
	 */
	for (i = 0; ; i++) {
		port = of_parse_phandle(dev->of_node, "ports", i);
		if (!port)
			break;

		if (!of_device_is_available(port->parent)) {
			of_node_put(port);
			continue;
		}

		for_each_child_of_node(port, ep) {
			remote = of_graph_get_remote_port_parent(ep);
			if (!remote || !of_device_is_available(remote)) {
				of_node_put(remote);
				continue;
			} else if (!of_device_is_available(remote->parent)) {
				dev_warn(dev, "parent device of %pOF is not available\n",
					 remote);
				of_node_put(remote);
				continue;
			}

			drm_of_component_match_add(dev, &match, compare_of,
						   remote);
			of_node_put(remote);
		}
		of_node_put(port);
	}

	return component_master_add_with_match(dev, m_ops, match);
}
EXPORT_SYMBOL(drm_of_component_probe);

/*
 * drm_of_encoder_active_endpoint - return the active encoder endpoint
 * @node: device tree node containing encoder input ports
 * @encoder: drm_encoder
 *
 * Given an encoder device node and a drm_encoder with a connected crtc,
 * parse the encoder endpoint connecting to the crtc port.
 */
int drm_of_encoder_active_endpoint(struct device_node *node,
				   struct drm_encoder *encoder,
				   struct of_endpoint *endpoint)
{
	struct device_node *ep;
	struct drm_crtc *crtc = encoder->crtc;
	struct device_node *port;
	int ret;

	if (!node || !crtc)
		return -EINVAL;

	for_each_endpoint_of_node(node, ep) {
		port = of_graph_get_remote_port(ep);
		of_node_put(port);
		if (port == crtc->port) {
			ret = of_graph_parse_endpoint(ep, endpoint);
			of_node_put(ep);
			return ret;
		}
	}

	return -EINVAL;
}
EXPORT_SYMBOL_GPL(drm_of_encoder_active_endpoint);

/*
 * drm_of_find_panel_or_bridge - return connected panel or bridge device
 * @np: device tree node containing encoder output ports
 * @panel: pointer to hold returned drm_panel
 * @bridge: pointer to hold returned drm_bridge
 *
 * Given a DT node's port and endpoint number, find the connected node and
 * return either the associated struct drm_panel or drm_bridge device. Either
 * @panel or @bridge must not be NULL.
 *
 * Returns zero if successful, or one of the standard error codes if it fails.
 */
int drm_of_find_panel_or_bridge(const struct device_node *np,
				int port, int endpoint,
				struct drm_panel **panel,
				struct drm_bridge **bridge)
{
	int ret = -EPROBE_DEFER;
	struct device_node *remote;

	if (!panel && !bridge)
		return -EINVAL;
	if (panel)
		*panel = NULL;

	remote = of_graph_get_remote_node(np, port, endpoint);
	if (!remote)
		return -ENODEV;

	if (!of_device_is_available(remote)) {
		of_node_put(remote);
		return -ENODEV;
	}

	if (panel) {
		*panel = of_drm_find_panel(remote);
		if (!IS_ERR(*panel))
			ret = 0;
		else
			*panel = NULL;
	}

	/* No panel found yet, check for a bridge next. */
	if (bridge) {
		if (ret) {
			*bridge = of_drm_find_bridge(remote);
			if (*bridge)
				ret = 0;
		} else {
			*bridge = NULL;
		}

	}

	of_node_put(remote);
	return ret;
}
EXPORT_SYMBOL_GPL(drm_of_find_panel_or_bridge);