summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/drm_of.c
blob: 177b600895d3c60052d88a0199f1f0265946a673 (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
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
// SPDX-License-Identifier: GPL-2.0-only
#include <linux/component.h>
#include <linux/export.h>
#include <linux/list.h>
#include <linux/media-bus-format.h>
#include <linux/of.h>
#include <linux/of_graph.h>

#include <drm/drm_bridge.h>
#include <drm/drm_crtc.h>
#include <drm/drm_device.h>
#include <drm/drm_encoder.h>
#include <drm/drm_mipi_dsi.h>
#include <drm/drm_of.h>
#include <drm/drm_panel.h>

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

/**
 * 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, component_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
 * @port: port in the device tree node
 * @endpoint: endpoint in the device tree node
 * @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.
 *
 * This function is deprecated and should not be used in new drivers. Use
 * devm_drm_of_get_bridge() instead.
 *
 * 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;

	/*
	 * of_graph_get_remote_node() produces a noisy error message if port
	 * node isn't found and the absence of the port is a legit case here,
	 * so at first we silently check whether graph presents in the
	 * device-tree node.
	 */
	if (!of_graph_is_present(np))
		return -ENODEV;

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

enum drm_of_lvds_pixels {
	DRM_OF_LVDS_EVEN = BIT(0),
	DRM_OF_LVDS_ODD = BIT(1),
};

static int drm_of_lvds_get_port_pixels_type(struct device_node *port_node)
{
	bool even_pixels =
		of_property_read_bool(port_node, "dual-lvds-even-pixels");
	bool odd_pixels =
		of_property_read_bool(port_node, "dual-lvds-odd-pixels");

	return (even_pixels ? DRM_OF_LVDS_EVEN : 0) |
	       (odd_pixels ? DRM_OF_LVDS_ODD : 0);
}

static int drm_of_lvds_get_remote_pixels_type(
			const struct device_node *port_node)
{
	struct device_node *endpoint = NULL;
	int pixels_type = -EPIPE;

	for_each_child_of_node(port_node, endpoint) {
		struct device_node *remote_port;
		int current_pt;

		if (!of_node_name_eq(endpoint, "endpoint"))
			continue;

		remote_port = of_graph_get_remote_port(endpoint);
		if (!remote_port) {
			of_node_put(endpoint);
			return -EPIPE;
		}

		current_pt = drm_of_lvds_get_port_pixels_type(remote_port);
		of_node_put(remote_port);
		if (pixels_type < 0)
			pixels_type = current_pt;

		/*
		 * Sanity check, ensure that all remote endpoints have the same
		 * pixel type. We may lift this restriction later if we need to
		 * support multiple sinks with different dual-link
		 * configurations by passing the endpoints explicitly to
		 * drm_of_lvds_get_dual_link_pixel_order().
		 */
		if (!current_pt || pixels_type != current_pt) {
			of_node_put(endpoint);
			return -EINVAL;
		}
	}

	return pixels_type;
}

/**
 * drm_of_lvds_get_dual_link_pixel_order - Get LVDS dual-link pixel order
 * @port1: First DT port node of the Dual-link LVDS source
 * @port2: Second DT port node of the Dual-link LVDS source
 *
 * An LVDS dual-link connection is made of two links, with even pixels
 * transitting on one link, and odd pixels on the other link. This function
 * returns, for two ports of an LVDS dual-link source, which port shall transmit
 * the even and odd pixels, based on the requirements of the connected sink.
 *
 * The pixel order is determined from the dual-lvds-even-pixels and
 * dual-lvds-odd-pixels properties in the sink's DT port nodes. If those
 * properties are not present, or if their usage is not valid, this function
 * returns -EINVAL.
 *
 * If either port is not connected, this function returns -EPIPE.
 *
 * @port1 and @port2 are typically DT sibling nodes, but may have different
 * parents when, for instance, two separate LVDS encoders carry the even and odd
 * pixels.
 *
 * Return:
 * * DRM_LVDS_DUAL_LINK_EVEN_ODD_PIXELS - @port1 carries even pixels and @port2
 *   carries odd pixels
 * * DRM_LVDS_DUAL_LINK_ODD_EVEN_PIXELS - @port1 carries odd pixels and @port2
 *   carries even pixels
 * * -EINVAL - @port1 and @port2 are not connected to a dual-link LVDS sink, or
 *   the sink configuration is invalid
 * * -EPIPE - when @port1 or @port2 are not connected
 */
int drm_of_lvds_get_dual_link_pixel_order(const struct device_node *port1,
					  const struct device_node *port2)
{
	int remote_p1_pt, remote_p2_pt;

	if (!port1 || !port2)
		return -EINVAL;

	remote_p1_pt = drm_of_lvds_get_remote_pixels_type(port1);
	if (remote_p1_pt < 0)
		return remote_p1_pt;

	remote_p2_pt = drm_of_lvds_get_remote_pixels_type(port2);
	if (remote_p2_pt < 0)
		return remote_p2_pt;

	/*
	 * A valid dual-lVDS bus is found when one remote port is marked with
	 * "dual-lvds-even-pixels", and the other remote port is marked with
	 * "dual-lvds-odd-pixels", bail out if the markers are not right.
	 */
	if (remote_p1_pt + remote_p2_pt != DRM_OF_LVDS_EVEN + DRM_OF_LVDS_ODD)
		return -EINVAL;

	return remote_p1_pt == DRM_OF_LVDS_EVEN ?
		DRM_LVDS_DUAL_LINK_EVEN_ODD_PIXELS :
		DRM_LVDS_DUAL_LINK_ODD_EVEN_PIXELS;
}
EXPORT_SYMBOL_GPL(drm_of_lvds_get_dual_link_pixel_order);

/**
 * drm_of_lvds_get_data_mapping - Get LVDS data mapping
 * @port: DT port node of the LVDS source or sink
 *
 * Convert DT "data-mapping" property string value into media bus format value.
 *
 * Return:
 * * MEDIA_BUS_FMT_RGB666_1X7X3_SPWG - data-mapping is "jeida-18"
 * * MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA - data-mapping is "jeida-24"
 * * MEDIA_BUS_FMT_RGB888_1X7X4_SPWG - data-mapping is "vesa-24"
 * * -EINVAL - the "data-mapping" property is unsupported
 * * -ENODEV - the "data-mapping" property is missing
 */
int drm_of_lvds_get_data_mapping(const struct device_node *port)
{
	const char *mapping;
	int ret;

	ret = of_property_read_string(port, "data-mapping", &mapping);
	if (ret < 0)
		return -ENODEV;

	if (!strcmp(mapping, "jeida-18"))
		return MEDIA_BUS_FMT_RGB666_1X7X3_SPWG;
	if (!strcmp(mapping, "jeida-24"))
		return MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA;
	if (!strcmp(mapping, "vesa-24"))
		return MEDIA_BUS_FMT_RGB888_1X7X4_SPWG;

	return -EINVAL;
}
EXPORT_SYMBOL_GPL(drm_of_lvds_get_data_mapping);

/**
 * drm_of_get_data_lanes_count - Get DSI/(e)DP data lane count
 * @endpoint: DT endpoint node of the DSI/(e)DP source or sink
 * @min: minimum supported number of data lanes
 * @max: maximum supported number of data lanes
 *
 * Count DT "data-lanes" property elements and check for validity.
 *
 * Return:
 * * min..max - positive integer count of "data-lanes" elements
 * * -ve - the "data-lanes" property is missing or invalid
 * * -EINVAL - the "data-lanes" property is unsupported
 */
int drm_of_get_data_lanes_count(const struct device_node *endpoint,
				const unsigned int min, const unsigned int max)
{
	int ret;

	ret = of_property_count_u32_elems(endpoint, "data-lanes");
	if (ret < 0)
		return ret;

	if (ret < min || ret > max)
		return -EINVAL;

	return ret;
}
EXPORT_SYMBOL_GPL(drm_of_get_data_lanes_count);

/**
 * drm_of_get_data_lanes_count_ep - Get DSI/(e)DP data lane count by endpoint
 * @port: DT port node of the DSI/(e)DP source or sink
 * @port_reg: identifier (value of reg property) of the parent port node
 * @reg: identifier (value of reg property) of the endpoint node
 * @min: minimum supported number of data lanes
 * @max: maximum supported number of data lanes
 *
 * Count DT "data-lanes" property elements and check for validity.
 * This variant uses endpoint specifier.
 *
 * Return:
 * * min..max - positive integer count of "data-lanes" elements
 * * -EINVAL - the "data-mapping" property is unsupported
 * * -ENODEV - the "data-mapping" property is missing
 */
int drm_of_get_data_lanes_count_ep(const struct device_node *port,
				   int port_reg, int reg,
				   const unsigned int min,
				   const unsigned int max)
{
	struct device_node *endpoint;
	int ret;

	endpoint = of_graph_get_endpoint_by_regs(port, port_reg, reg);
	ret = drm_of_get_data_lanes_count(endpoint, min, max);
	of_node_put(endpoint);

	return ret;
}
EXPORT_SYMBOL_GPL(drm_of_get_data_lanes_count_ep);

#if IS_ENABLED(CONFIG_DRM_MIPI_DSI)

/**
 * drm_of_get_dsi_bus - find the DSI bus for a given device
 * @dev: parent device of display (SPI, I2C)
 *
 * Gets parent DSI bus for a DSI device controlled through a bus other
 * than MIPI-DCS (SPI, I2C, etc.) using the Device Tree.
 *
 * Returns pointer to mipi_dsi_host if successful, -EINVAL if the
 * request is unsupported, -EPROBE_DEFER if the DSI host is found but
 * not available, or -ENODEV otherwise.
 */
struct mipi_dsi_host *drm_of_get_dsi_bus(struct device *dev)
{
	struct mipi_dsi_host *dsi_host;
	struct device_node *endpoint, *dsi_host_node;

	/*
	 * Get first endpoint child from device.
	 */
	endpoint = of_graph_get_next_endpoint(dev->of_node, NULL);
	if (!endpoint)
		return ERR_PTR(-ENODEV);

	/*
	 * Follow the first endpoint to get the DSI host node and then
	 * release the endpoint since we no longer need it.
	 */
	dsi_host_node = of_graph_get_remote_port_parent(endpoint);
	of_node_put(endpoint);
	if (!dsi_host_node)
		return ERR_PTR(-ENODEV);

	/*
	 * Get the DSI host from the DSI host node. If we get an error
	 * or the return is null assume we're not ready to probe just
	 * yet. Release the DSI host node since we're done with it.
	 */
	dsi_host = of_find_mipi_dsi_host_by_node(dsi_host_node);
	of_node_put(dsi_host_node);
	if (IS_ERR_OR_NULL(dsi_host))
		return ERR_PTR(-EPROBE_DEFER);

	return dsi_host;
}
EXPORT_SYMBOL_GPL(drm_of_get_dsi_bus);

#endif /* CONFIG_DRM_MIPI_DSI */