summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/omapdrm/dss/base.c
blob: f8dad99013e8dfcbc1d00831d4a070a0bfa7790c (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
/*
 * OMAP Display Subsystem Base
 *
 * Copyright (C) 2015-2017 Texas Instruments Incorporated - http://www.ti.com/
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 */

#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/of_graph.h>
#include <linux/platform_device.h>

#include "dss.h"
#include "omapdss.h"

static struct dss_device *dss_device;

struct dss_device *omapdss_get_dss(void)
{
	return dss_device;
}
EXPORT_SYMBOL(omapdss_get_dss);

void omapdss_set_dss(struct dss_device *dss)
{
	dss_device = dss;
}
EXPORT_SYMBOL(omapdss_set_dss);

struct dispc_device *dispc_get_dispc(struct dss_device *dss)
{
	return dss->dispc;
}
EXPORT_SYMBOL(dispc_get_dispc);

const struct dispc_ops *dispc_get_ops(struct dss_device *dss)
{
	return dss->dispc_ops;
}
EXPORT_SYMBOL(dispc_get_ops);


/* -----------------------------------------------------------------------------
 * OMAP DSS Devices Handling
 */

static LIST_HEAD(omapdss_devices_list);
static DEFINE_MUTEX(omapdss_devices_lock);

void omapdss_device_register(struct omap_dss_device *dssdev)
{
	mutex_lock(&omapdss_devices_lock);
	list_add_tail(&dssdev->list, &omapdss_devices_list);
	mutex_unlock(&omapdss_devices_lock);
}
EXPORT_SYMBOL_GPL(omapdss_device_register);

void omapdss_device_unregister(struct omap_dss_device *dssdev)
{
	mutex_lock(&omapdss_devices_lock);
	list_del(&dssdev->list);
	mutex_unlock(&omapdss_devices_lock);
}
EXPORT_SYMBOL_GPL(omapdss_device_unregister);

static bool omapdss_device_is_registered(struct device_node *node)
{
	struct omap_dss_device *dssdev;
	bool found = false;

	mutex_lock(&omapdss_devices_lock);

	list_for_each_entry(dssdev, &omapdss_devices_list, list) {
		if (dssdev->dev->of_node == node) {
			found = true;
			break;
		}
	}

	mutex_unlock(&omapdss_devices_lock);
	return found;
}

struct omap_dss_device *omapdss_device_get(struct omap_dss_device *dssdev)
{
	if (!try_module_get(dssdev->owner))
		return NULL;

	if (get_device(dssdev->dev) == NULL) {
		module_put(dssdev->owner);
		return NULL;
	}

	return dssdev;
}
EXPORT_SYMBOL(omapdss_device_get);

void omapdss_device_put(struct omap_dss_device *dssdev)
{
	put_device(dssdev->dev);
	module_put(dssdev->owner);
}
EXPORT_SYMBOL(omapdss_device_put);

struct omap_dss_device *omapdss_find_device_by_node(struct device_node *node)
{
	struct omap_dss_device *dssdev;

	list_for_each_entry(dssdev, &omapdss_devices_list, list) {
		if (dssdev->dev->of_node == node)
			return omapdss_device_get(dssdev);
	}

	return NULL;
}

/*
 * Search for the next output device starting at @from. Release the reference to
 * the @from device, and acquire a reference to the returned device if found.
 */
struct omap_dss_device *omapdss_device_next_output(struct omap_dss_device *from)
{
	struct omap_dss_device *dssdev;
	struct list_head *list;

	mutex_lock(&omapdss_devices_lock);

	if (list_empty(&omapdss_devices_list)) {
		dssdev = NULL;
		goto done;
	}

	/*
	 * Start from the from entry if given or from omapdss_devices_list
	 * otherwise.
	 */
	list = from ? &from->list : &omapdss_devices_list;

	list_for_each_entry(dssdev, list, list) {
		/*
		 * Stop if we reach the omapdss_devices_list, that's the end of
		 * the list.
		 */
		if (&dssdev->list == &omapdss_devices_list) {
			dssdev = NULL;
			goto done;
		}

		if (dssdev->id &&
		    (dssdev->next || dssdev->bridge || dssdev->panel))
			goto done;
	}

	dssdev = NULL;

done:
	if (from)
		omapdss_device_put(from);
	if (dssdev)
		omapdss_device_get(dssdev);

	mutex_unlock(&omapdss_devices_lock);
	return dssdev;
}
EXPORT_SYMBOL(omapdss_device_next_output);

static bool omapdss_device_is_connected(struct omap_dss_device *dssdev)
{
	return dssdev->dss;
}

int omapdss_device_connect(struct dss_device *dss,
			   struct omap_dss_device *src,
			   struct omap_dss_device *dst)
{
	int ret;

	dev_dbg(&dss->pdev->dev, "connect(%s, %s)\n",
		src ? dev_name(src->dev) : "NULL",
		dst ? dev_name(dst->dev) : "NULL");

	if (!dst) {
		/*
		 * The destination is NULL when the source is connected to a
		 * bridge or panel instead of a DSS device. Stop here, we will
		 * attach the bridge or panel later when we will have a DRM
		 * encoder.
		 */
		return src && (src->bridge || src->panel) ? 0 : -EINVAL;
	}

	if (omapdss_device_is_connected(dst))
		return -EBUSY;

	dst->dss = dss;

	ret = dst->ops->connect(src, dst);
	if (ret < 0) {
		dst->dss = NULL;
		return ret;
	}

	return 0;
}
EXPORT_SYMBOL_GPL(omapdss_device_connect);

void omapdss_device_disconnect(struct omap_dss_device *src,
			       struct omap_dss_device *dst)
{
	struct dss_device *dss = src ? src->dss : dst->dss;

	dev_dbg(&dss->pdev->dev, "disconnect(%s, %s)\n",
		src ? dev_name(src->dev) : "NULL",
		dst ? dev_name(dst->dev) : "NULL");

	if (!dst) {
		WARN_ON(!src->bridge && !src->panel);
		return;
	}

	if (!dst->id && !omapdss_device_is_connected(dst)) {
		WARN_ON(!dst->display);
		return;
	}

	WARN_ON(dst->state != OMAP_DSS_DISPLAY_DISABLED);

	dst->ops->disconnect(src, dst);
	dst->dss = NULL;
}
EXPORT_SYMBOL_GPL(omapdss_device_disconnect);

void omapdss_device_pre_enable(struct omap_dss_device *dssdev)
{
	if (!dssdev)
		return;

	omapdss_device_pre_enable(dssdev->next);

	if (dssdev->ops->pre_enable)
		dssdev->ops->pre_enable(dssdev);
}
EXPORT_SYMBOL_GPL(omapdss_device_pre_enable);

void omapdss_device_enable(struct omap_dss_device *dssdev)
{
	if (!dssdev)
		return;

	if (dssdev->ops->enable)
		dssdev->ops->enable(dssdev);

	omapdss_device_enable(dssdev->next);

	dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
}
EXPORT_SYMBOL_GPL(omapdss_device_enable);

void omapdss_device_disable(struct omap_dss_device *dssdev)
{
	if (!dssdev)
		return;

	omapdss_device_disable(dssdev->next);

	if (dssdev->ops->disable)
		dssdev->ops->disable(dssdev);
}
EXPORT_SYMBOL_GPL(omapdss_device_disable);

void omapdss_device_post_disable(struct omap_dss_device *dssdev)
{
	if (!dssdev)
		return;

	if (dssdev->ops->post_disable)
		dssdev->ops->post_disable(dssdev);

	omapdss_device_post_disable(dssdev->next);

	dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
}
EXPORT_SYMBOL_GPL(omapdss_device_post_disable);

/* -----------------------------------------------------------------------------
 * Components Handling
 */

static struct list_head omapdss_comp_list;

struct omapdss_comp_node {
	struct list_head list;
	struct device_node *node;
	bool dss_core_component;
	const char *compat;
};

static bool omapdss_list_contains(const struct device_node *node)
{
	struct omapdss_comp_node *comp;

	list_for_each_entry(comp, &omapdss_comp_list, list) {
		if (comp->node == node)
			return true;
	}

	return false;
}

static void omapdss_walk_device(struct device *dev, struct device_node *node,
				bool dss_core)
{
	struct omapdss_comp_node *comp;
	struct device_node *n;
	const char *compat;
	int ret;

	ret = of_property_read_string(node, "compatible", &compat);
	if (ret < 0)
		return;

	comp = devm_kzalloc(dev, sizeof(*comp), GFP_KERNEL);
	if (comp) {
		comp->node = node;
		comp->dss_core_component = dss_core;
		comp->compat = compat;
		list_add(&comp->list, &omapdss_comp_list);
	}

	/*
	 * of_graph_get_remote_port_parent() prints an error if there is no
	 * port/ports node. To avoid that, check first that there's the node.
	 */
	n = of_get_child_by_name(node, "ports");
	if (!n)
		n = of_get_child_by_name(node, "port");
	if (!n)
		return;

	of_node_put(n);

	n = NULL;
	while ((n = of_graph_get_next_endpoint(node, n)) != NULL) {
		struct device_node *pn = of_graph_get_remote_port_parent(n);

		if (!pn)
			continue;

		if (!of_device_is_available(pn) || omapdss_list_contains(pn)) {
			of_node_put(pn);
			continue;
		}

		omapdss_walk_device(dev, pn, false);
	}
}

void omapdss_gather_components(struct device *dev)
{
	struct device_node *child;

	INIT_LIST_HEAD(&omapdss_comp_list);

	omapdss_walk_device(dev, dev->of_node, true);

	for_each_available_child_of_node(dev->of_node, child)
		omapdss_walk_device(dev, child, true);
}
EXPORT_SYMBOL(omapdss_gather_components);

static bool omapdss_component_is_loaded(struct omapdss_comp_node *comp)
{
	if (comp->dss_core_component)
		return true;
	if (!strstarts(comp->compat, "omapdss,"))
		return true;
	if (omapdss_device_is_registered(comp->node))
		return true;

	return false;
}

bool omapdss_stack_is_ready(void)
{
	struct omapdss_comp_node *comp;

	list_for_each_entry(comp, &omapdss_comp_list, list) {
		if (!omapdss_component_is_loaded(comp))
			return false;
	}

	return true;
}
EXPORT_SYMBOL(omapdss_stack_is_ready);

MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
MODULE_DESCRIPTION("OMAP Display Subsystem Base");
MODULE_LICENSE("GPL v2");