aboutsummaryrefslogtreecommitdiffstats
blob: 86d88bbc0f0bb983d18418197f7c38e9eaa42072 (plain) (blame)
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
/*
 * drivers/gpu/drm/omapdrm/omap_irq.c
 *
 * Copyright (C) 2012 Texas Instruments
 * Author: Rob Clark <rob.clark@linaro.org>
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "omap_drv.h"
#include "drm_fb_helper.h"

static DEFINE_SPINLOCK(list_lock);

static void omap_irq_error_handler(struct omap_drm_irq *irq,
		uint32_t irqstatus)
{
	DRM_ERROR("errors: %08x\n", irqstatus);
}

/* call with list_lock and dispc runtime held */
static void omap_irq_update(struct drm_device *dev)
{
	struct omap_drm_private *priv = dev->dev_private;
	struct omap_drm_irq *irq;
	uint32_t irqmask = priv->vblank_mask;

	assert_spin_locked(&list_lock);

	list_for_each_entry(irq, &priv->irq_list, node)
		irqmask |= irq->irqmask;

	DBG("irqmask=%08x", irqmask);

	dispc_write_irqenable(irqmask);
	dispc_read_irqenable();        /* flush posted write */
}

void __omap_irq_register(struct drm_device *dev, struct omap_drm_irq *irq)
{
	struct omap_drm_private *priv = dev->dev_private;
	unsigned long flags;

	spin_lock_irqsave(&list_lock, flags);

	if (!WARN_ON(irq->registered)) {
		irq->registered = true;
		list_add(&irq->node, &priv->irq_list);
		omap_irq_update(dev);
	}

	spin_unlock_irqrestore(&list_lock, flags);
}

void omap_irq_register(struct drm_device *dev, struct omap_drm_irq *irq)
{
	dispc_runtime_get();

	__omap_irq_register(dev, irq);

	dispc_runtime_put();
}

void __omap_irq_unregister(struct drm_device *dev, struct omap_drm_irq *irq)
{
	unsigned long flags;

	spin_lock_irqsave(&list_lock, flags);

	if (!WARN_ON(!irq->registered)) {
		irq->registered = false;
		list_del(&irq->node);
		omap_irq_update(dev);
	}

	spin_unlock_irqrestore(&list_lock, flags);
}

void omap_irq_unregister(struct drm_device *dev, struct omap_drm_irq *irq)
{
	dispc_runtime_get();

	__omap_irq_unregister(dev, irq);

	dispc_runtime_put();
}

struct omap_irq_wait {
	struct omap_drm_irq irq;
	int count;
};

static DECLARE_WAIT_QUEUE_HEAD(wait_event);

static void wait_irq(struct omap_drm_irq *irq, uint32_t irqstatus)
{
	struct omap_irq_wait *wait =
			container_of(irq, struct omap_irq_wait, irq);
	wait->count--;
	wake_up_all(&wait_event);
}

struct omap_irq_wait * omap_irq_wait_init(struct drm_device *dev,
		uint32_t irqmask, int count)
{
	struct omap_irq_wait *wait = kzalloc(sizeof(*wait), GFP_KERNEL);
	wait->irq.irq = wait_irq;
	wait->irq.irqmask = irqmask;
	wait->count = count;
	omap_irq_register(dev, &wait->irq);
	return wait;
}

int omap_irq_wait(struct drm_device *dev, struct omap_irq_wait *wait,
		unsigned long timeout)
{
	int ret = wait_event_timeout(wait_event, (wait->count <= 0), timeout);
	omap_irq_unregister(dev, &wait->irq);
	kfree(wait);
	if (ret == 0)
		return -1;
	return 0;
}

/**
 * enable_vblank - enable vblank interrupt events
 * @dev: DRM device
 * @crtc: which irq to enable
 *
 * Enable vblank interrupts for @crtc.  If the device doesn't have
 * a hardware vblank counter, this routine should be a no-op, since
 * interrupts will have to stay on to keep the count accurate.
 *
 * RETURNS
 * Zero on success, appropriate errno if the given @crtc's vblank
 * interrupt cannot be enabled.
 */
int omap_irq_enable_vblank(struct drm_device *dev, int crtc_id)
{
	struct omap_drm_private *priv = dev->dev_private;
	struct drm_crtc *crtc = priv->crtcs[crtc_id];
	unsigned long flags;

	DBG("dev=%p, crtc=%d", dev, crtc_id);

	dispc_runtime_get();
	spin_lock_irqsave(&list_lock, flags);
	priv->vblank_mask |= pipe2vbl(crtc);
	omap_irq_update(dev);
	spin_unlock_irqrestore(&list_lock, flags);
	dispc_runtime_put();

	return 0;
}

/**
 * disable_vblank - disable vblank interrupt events
 * @dev: DRM device
 * @crtc: which irq to enable
 *
 * Disable vblank interrupts for @crtc.  If the device doesn't have
 * a hardware vblank counter, this routine should be a no-op, since
 * interrupts will have to stay on to keep the count accurate.
 */
void omap_irq_disable_vblank(struct drm_device *dev, int crtc_id)
{
	struct omap_drm_private *priv = dev->dev_private;
	struct drm_crtc *crtc = priv->crtcs[crtc_id];
	unsigned long flags;

	DBG("dev=%p, crtc=%d", dev, crtc_id);

	dispc_runtime_get();
	spin_lock_irqsave(&list_lock, flags);
	priv->vblank_mask &= ~pipe2vbl(crtc);
	omap_irq_update(dev);
	spin_unlock_irqrestore(&list_lock, flags);
	dispc_runtime_put();
}

irqreturn_t omap_hdmi_hpd_irq_handler(int irq, void *arg)
{
	struct drm_device *dev = (struct drm_device *)arg;
	struct drm_connector *connector;
	struct omap_drm_private *priv = dev->dev_private;
	unsigned long flags = 0;

	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
	if ((connector->connector_type == DRM_MODE_CONNECTOR_HDMIA) ||
		(connector->connector_type == DRM_MODE_CONNECTOR_HDMIB)) {
		connector->status = connector_status_unknown;

		if (priv->fbdev) {
				spin_lock_irqsave(&list_lock, flags);
				drm_kms_helper_poll_enable(dev);
				connector->force = 0;
				spin_unlock_irqrestore(&list_lock, flags);
			}
		}
	}

	return IRQ_HANDLED;
}

irqreturn_t omap_irq_handler(int irq, void *arg)
{
	struct drm_device *dev = (struct drm_device *) arg;
	struct omap_drm_private *priv = dev->dev_private;
	struct omap_drm_irq *handler, *n;
	unsigned long flags;
	unsigned int id;
	u32 irqstatus;

	irqstatus = dispc_read_irqstatus();
	dispc_clear_irqstatus(irqstatus);
	dispc_read_irqstatus();        /* flush posted write */

	VERB("irqs: %08x", irqstatus);

	for (id = 0; id < priv->num_crtcs; id++) {
		struct drm_crtc *crtc = priv->crtcs[id];

		if (irqstatus & pipe2vbl(crtc))
			drm_handle_vblank(dev, id);
	}

	spin_lock_irqsave(&list_lock, flags);
	list_for_each_entry_safe(handler, n, &priv->irq_list, node) {
		if (handler->irqmask & irqstatus) {
			spin_unlock_irqrestore(&list_lock, flags);
			handler->irq(handler, handler->irqmask & irqstatus);
			spin_lock_irqsave(&list_lock, flags);
		}
	}
	spin_unlock_irqrestore(&list_lock, flags);

	return IRQ_HANDLED;
}

void omap_irq_preinstall(struct drm_device *dev)
{
	DBG("dev=%p", dev);
	dispc_runtime_get();
	dispc_clear_irqstatus(0xffffffff);
	dispc_runtime_put();
}

int omap_irq_postinstall(struct drm_device *dev)
{
	struct omap_drm_private *priv = dev->dev_private;
	struct omap_drm_irq *error_handler = &priv->error_handler;

	DBG("dev=%p", dev);

	INIT_LIST_HEAD(&priv->irq_list);

	error_handler->irq = omap_irq_error_handler;
	error_handler->irqmask = DISPC_IRQ_OCP_ERR;

	/* for now ignore DISPC_IRQ_SYNC_LOST_DIGIT.. really I think
	 * we just need to ignore it while enabling tv-out
	 */
	error_handler->irqmask &= ~DISPC_IRQ_SYNC_LOST_DIGIT;

	omap_irq_register(dev, error_handler);

	return 0;
}

void omap_irq_uninstall(struct drm_device *dev)
{
	DBG("dev=%p", dev);
	// TODO prolly need to call drm_irq_uninstall() somewhere too
}

/*
 * We need a special version, instead of just using drm_irq_install(),
 * because we need to register the irq via omapdss.  Once omapdss and
 * omapdrm are merged together we can assign the dispc hwmod data to
 * ourselves and drop these and just use drm_irq_{install,uninstall}()
 */

int omap_drm_irq_install(struct drm_device *dev)
{
	int ret;

	mutex_lock(&dev->struct_mutex);

	if (dev->irq_enabled) {
		mutex_unlock(&dev->struct_mutex);
		return -EBUSY;
	}
	dev->irq_enabled = true;
	mutex_unlock(&dev->struct_mutex);

	/* Before installing handler */
	if (dev->driver->irq_preinstall)
		dev->driver->irq_preinstall(dev);

	ret = dispc_request_irq(dev->driver->irq_handler, dev);

	if (ret < 0) {
		mutex_lock(&dev->struct_mutex);
		dev->irq_enabled = false;
		mutex_unlock(&dev->struct_mutex);
		return ret;
	}

	/* After installing handler */
	if (dev->driver->irq_postinstall)
		ret = dev->driver->irq_postinstall(dev);

	if (ret < 0) {
		mutex_lock(&dev->struct_mutex);
		dev->irq_enabled = false;
		mutex_unlock(&dev->struct_mutex);
		dispc_free_irq(dev);
	}

	return ret;
}

int omap_drm_irq_uninstall(struct drm_device *dev)
{
	unsigned long irqflags;
	bool irq_enabled;
	int i;

	mutex_lock(&dev->struct_mutex);
	irq_enabled = dev->irq_enabled;
	dev->irq_enabled = false;
	mutex_unlock(&dev->struct_mutex);

	/*
	 * Wake up any waiters so they don't hang.
	 */
	if (dev->num_crtcs) {
		spin_lock_irqsave(&dev->vbl_lock, irqflags);
		for (i = 0; i < dev->num_crtcs; i++) {
			wake_up(&dev->vblank[i].queue);
			dev->vblank[i].enabled = false;
			dev->vblank[i].last =
				dev->driver->get_vblank_counter(dev, i);
		}
		spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
	}

	if (!irq_enabled)
		return -EINVAL;

	if (dev->driver->irq_uninstall)
		dev->driver->irq_uninstall(dev);

	dispc_free_irq(dev);

	return 0;
}