summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/exynos/exynos_drm_vidi.c
blob: f5e1adfcaa514ee0a84b00b1c7357e7d43a64ecf (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
// SPDX-License-Identifier: GPL-2.0-or-later
/* exynos_drm_vidi.c
 *
 * Copyright (C) 2012 Samsung Electronics Co.Ltd
 * Authors:
 *	Inki Dae <inki.dae@samsung.com>
 */

#include <linux/component.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/timer.h>

#include <drm/drm_atomic_helper.h>
#include <drm/drm_edid.h>
#include <drm/drm_framebuffer.h>
#include <drm/drm_probe_helper.h>
#include <drm/drm_simple_kms_helper.h>
#include <drm/drm_vblank.h>
#include <drm/exynos_drm.h>

#include "exynos_drm_crtc.h"
#include "exynos_drm_drv.h"
#include "exynos_drm_fb.h"
#include "exynos_drm_plane.h"
#include "exynos_drm_vidi.h"

/* VIDI uses fixed refresh rate of 50Hz */
#define VIDI_REFRESH_TIME (1000 / 50)

/* vidi has totally three virtual windows. */
#define WINDOWS_NR		3

#define ctx_from_connector(c)	container_of(c, struct vidi_context, \
					connector)

struct vidi_context {
	struct drm_encoder		encoder;
	struct drm_device		*drm_dev;
	struct device			*dev;
	struct exynos_drm_crtc		*crtc;
	struct drm_connector		connector;
	struct exynos_drm_plane		planes[WINDOWS_NR];
	struct edid			*raw_edid;
	unsigned int			clkdiv;
	unsigned int			connected;
	bool				suspended;
	struct timer_list		timer;
	struct mutex			lock;
};

static inline struct vidi_context *encoder_to_vidi(struct drm_encoder *e)
{
	return container_of(e, struct vidi_context, encoder);
}

static const char fake_edid_info[] = {
	0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x4c, 0x2d, 0x05, 0x05,
	0x00, 0x00, 0x00, 0x00, 0x30, 0x12, 0x01, 0x03, 0x80, 0x10, 0x09, 0x78,
	0x0a, 0xee, 0x91, 0xa3, 0x54, 0x4c, 0x99, 0x26, 0x0f, 0x50, 0x54, 0xbd,
	0xee, 0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
	0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x66, 0x21, 0x50, 0xb0, 0x51, 0x00,
	0x1b, 0x30, 0x40, 0x70, 0x36, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e,
	0x01, 0x1d, 0x00, 0x72, 0x51, 0xd0, 0x1e, 0x20, 0x6e, 0x28, 0x55, 0x00,
	0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x18,
	0x4b, 0x1a, 0x44, 0x17, 0x00, 0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
	0x00, 0x00, 0x00, 0xfc, 0x00, 0x53, 0x41, 0x4d, 0x53, 0x55, 0x4e, 0x47,
	0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x01, 0xbc, 0x02, 0x03, 0x1e, 0xf1,
	0x46, 0x84, 0x05, 0x03, 0x10, 0x20, 0x22, 0x23, 0x09, 0x07, 0x07, 0x83,
	0x01, 0x00, 0x00, 0xe2, 0x00, 0x0f, 0x67, 0x03, 0x0c, 0x00, 0x10, 0x00,
	0xb8, 0x2d, 0x01, 0x1d, 0x80, 0x18, 0x71, 0x1c, 0x16, 0x20, 0x58, 0x2c,
	0x25, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x9e, 0x8c, 0x0a, 0xd0, 0x8a,
	0x20, 0xe0, 0x2d, 0x10, 0x10, 0x3e, 0x96, 0x00, 0xa0, 0x5a, 0x00, 0x00,
	0x00, 0x18, 0x02, 0x3a, 0x80, 0x18, 0x71, 0x38, 0x2d, 0x40, 0x58, 0x2c,
	0x45, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x06
};

static const uint32_t formats[] = {
	DRM_FORMAT_XRGB8888,
	DRM_FORMAT_ARGB8888,
	DRM_FORMAT_NV12,
};

static const enum drm_plane_type vidi_win_types[WINDOWS_NR] = {
	DRM_PLANE_TYPE_PRIMARY,
	DRM_PLANE_TYPE_OVERLAY,
	DRM_PLANE_TYPE_CURSOR,
};

static int vidi_enable_vblank(struct exynos_drm_crtc *crtc)
{
	struct vidi_context *ctx = crtc->ctx;

	if (ctx->suspended)
		return -EPERM;

	mod_timer(&ctx->timer,
		jiffies + msecs_to_jiffies(VIDI_REFRESH_TIME) - 1);

	return 0;
}

static void vidi_disable_vblank(struct exynos_drm_crtc *crtc)
{
}

static void vidi_update_plane(struct exynos_drm_crtc *crtc,
			      struct exynos_drm_plane *plane)
{
	struct drm_plane_state *state = plane->base.state;
	struct vidi_context *ctx = crtc->ctx;
	dma_addr_t addr;

	if (ctx->suspended)
		return;

	addr = exynos_drm_fb_dma_addr(state->fb, 0);
	DRM_DEV_DEBUG_KMS(ctx->dev, "dma_addr = %pad\n", &addr);
}

static void vidi_atomic_enable(struct exynos_drm_crtc *crtc)
{
	struct vidi_context *ctx = crtc->ctx;

	mutex_lock(&ctx->lock);

	ctx->suspended = false;

	mutex_unlock(&ctx->lock);

	drm_crtc_vblank_on(&crtc->base);
}

static void vidi_atomic_disable(struct exynos_drm_crtc *crtc)
{
	struct vidi_context *ctx = crtc->ctx;

	drm_crtc_vblank_off(&crtc->base);

	mutex_lock(&ctx->lock);

	ctx->suspended = true;

	mutex_unlock(&ctx->lock);
}

static const struct exynos_drm_crtc_ops vidi_crtc_ops = {
	.atomic_enable = vidi_atomic_enable,
	.atomic_disable = vidi_atomic_disable,
	.enable_vblank = vidi_enable_vblank,
	.disable_vblank = vidi_disable_vblank,
	.update_plane = vidi_update_plane,
	.atomic_flush = exynos_crtc_handle_event,
};

static void vidi_fake_vblank_timer(struct timer_list *t)
{
	struct vidi_context *ctx = from_timer(ctx, t, timer);

	if (drm_crtc_handle_vblank(&ctx->crtc->base))
		mod_timer(&ctx->timer,
			jiffies + msecs_to_jiffies(VIDI_REFRESH_TIME) - 1);
}

static ssize_t vidi_show_connection(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct vidi_context *ctx = dev_get_drvdata(dev);
	int rc;

	mutex_lock(&ctx->lock);

	rc = sprintf(buf, "%d\n", ctx->connected);

	mutex_unlock(&ctx->lock);

	return rc;
}

static ssize_t vidi_store_connection(struct device *dev,
				struct device_attribute *attr,
				const char *buf, size_t len)
{
	struct vidi_context *ctx = dev_get_drvdata(dev);
	int ret;

	ret = kstrtoint(buf, 0, &ctx->connected);
	if (ret)
		return ret;

	if (ctx->connected > 1)
		return -EINVAL;

	/* use fake edid data for test. */
	if (!ctx->raw_edid)
		ctx->raw_edid = (struct edid *)fake_edid_info;

	/* if raw_edid isn't same as fake data then it can't be tested. */
	if (ctx->raw_edid != (struct edid *)fake_edid_info) {
		DRM_DEV_DEBUG_KMS(dev, "edid data is not fake data.\n");
		return -EINVAL;
	}

	DRM_DEV_DEBUG_KMS(dev, "requested connection.\n");

	drm_helper_hpd_irq_event(ctx->drm_dev);

	return len;
}

static DEVICE_ATTR(connection, 0644, vidi_show_connection,
			vidi_store_connection);

static struct attribute *vidi_attrs[] = {
	&dev_attr_connection.attr,
	NULL,
};
ATTRIBUTE_GROUPS(vidi);

int vidi_connection_ioctl(struct drm_device *drm_dev, void *data,
				struct drm_file *file_priv)
{
	struct vidi_context *ctx = dev_get_drvdata(drm_dev->dev);
	struct drm_exynos_vidi_connection *vidi = data;

	if (!vidi) {
		DRM_DEV_DEBUG_KMS(ctx->dev,
				  "user data for vidi is null.\n");
		return -EINVAL;
	}

	if (vidi->connection > 1) {
		DRM_DEV_DEBUG_KMS(ctx->dev,
				  "connection should be 0 or 1.\n");
		return -EINVAL;
	}

	if (ctx->connected == vidi->connection) {
		DRM_DEV_DEBUG_KMS(ctx->dev,
				  "same connection request.\n");
		return -EINVAL;
	}

	if (vidi->connection) {
		struct edid *raw_edid;

		raw_edid = (struct edid *)(unsigned long)vidi->edid;
		if (!drm_edid_is_valid(raw_edid)) {
			DRM_DEV_DEBUG_KMS(ctx->dev,
					  "edid data is invalid.\n");
			return -EINVAL;
		}
		ctx->raw_edid = drm_edid_duplicate(raw_edid);
		if (!ctx->raw_edid) {
			DRM_DEV_DEBUG_KMS(ctx->dev,
					  "failed to allocate raw_edid.\n");
			return -ENOMEM;
		}
	} else {
		/*
		 * with connection = 0, free raw_edid
		 * only if raw edid data isn't same as fake data.
		 */
		if (ctx->raw_edid && ctx->raw_edid !=
				(struct edid *)fake_edid_info) {
			kfree(ctx->raw_edid);
			ctx->raw_edid = NULL;
		}
	}

	ctx->connected = vidi->connection;
	drm_helper_hpd_irq_event(ctx->drm_dev);

	return 0;
}

static enum drm_connector_status vidi_detect(struct drm_connector *connector,
			bool force)
{
	struct vidi_context *ctx = ctx_from_connector(connector);

	/*
	 * connection request would come from user side
	 * to do hotplug through specific ioctl.
	 */
	return ctx->connected ? connector_status_connected :
			connector_status_disconnected;
}

static void vidi_connector_destroy(struct drm_connector *connector)
{
}

static const struct drm_connector_funcs vidi_connector_funcs = {
	.fill_modes = drm_helper_probe_single_connector_modes,
	.detect = vidi_detect,
	.destroy = vidi_connector_destroy,
	.reset = drm_atomic_helper_connector_reset,
	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
};

static int vidi_get_modes(struct drm_connector *connector)
{
	struct vidi_context *ctx = ctx_from_connector(connector);
	struct edid *edid;
	int edid_len;

	/*
	 * the edid data comes from user side and it would be set
	 * to ctx->raw_edid through specific ioctl.
	 */
	if (!ctx->raw_edid) {
		DRM_DEV_DEBUG_KMS(ctx->dev, "raw_edid is null.\n");
		return -EFAULT;
	}

	edid_len = (1 + ctx->raw_edid->extensions) * EDID_LENGTH;
	edid = kmemdup(ctx->raw_edid, edid_len, GFP_KERNEL);
	if (!edid) {
		DRM_DEV_DEBUG_KMS(ctx->dev, "failed to allocate edid\n");
		return -ENOMEM;
	}

	drm_connector_update_edid_property(connector, edid);

	return drm_add_edid_modes(connector, edid);
}

static const struct drm_connector_helper_funcs vidi_connector_helper_funcs = {
	.get_modes = vidi_get_modes,
};

static int vidi_create_connector(struct drm_encoder *encoder)
{
	struct vidi_context *ctx = encoder_to_vidi(encoder);
	struct drm_connector *connector = &ctx->connector;
	int ret;

	connector->polled = DRM_CONNECTOR_POLL_HPD;

	ret = drm_connector_init(ctx->drm_dev, connector,
			&vidi_connector_funcs, DRM_MODE_CONNECTOR_VIRTUAL);
	if (ret) {
		DRM_DEV_ERROR(ctx->dev,
			      "Failed to initialize connector with drm\n");
		return ret;
	}

	drm_connector_helper_add(connector, &vidi_connector_helper_funcs);
	drm_connector_attach_encoder(connector, encoder);

	return 0;
}

static void exynos_vidi_mode_set(struct drm_encoder *encoder,
			       struct drm_display_mode *mode,
			       struct drm_display_mode *adjusted_mode)
{
}

static void exynos_vidi_enable(struct drm_encoder *encoder)
{
}

static void exynos_vidi_disable(struct drm_encoder *encoder)
{
}

static const struct drm_encoder_helper_funcs exynos_vidi_encoder_helper_funcs = {
	.mode_set = exynos_vidi_mode_set,
	.enable = exynos_vidi_enable,
	.disable = exynos_vidi_disable,
};

static int vidi_bind(struct device *dev, struct device *master, void *data)
{
	struct vidi_context *ctx = dev_get_drvdata(dev);
	struct drm_device *drm_dev = data;
	struct drm_encoder *encoder = &ctx->encoder;
	struct exynos_drm_plane *exynos_plane;
	struct exynos_drm_plane_config plane_config = { 0 };
	unsigned int i;
	int ret;

	ctx->drm_dev = drm_dev;

	plane_config.pixel_formats = formats;
	plane_config.num_pixel_formats = ARRAY_SIZE(formats);

	for (i = 0; i < WINDOWS_NR; i++) {
		plane_config.zpos = i;
		plane_config.type = vidi_win_types[i];

		ret = exynos_plane_init(drm_dev, &ctx->planes[i], i,
					&plane_config);
		if (ret)
			return ret;
	}

	exynos_plane = &ctx->planes[DEFAULT_WIN];
	ctx->crtc = exynos_drm_crtc_create(drm_dev, &exynos_plane->base,
			EXYNOS_DISPLAY_TYPE_VIDI, &vidi_crtc_ops, ctx);
	if (IS_ERR(ctx->crtc)) {
		DRM_DEV_ERROR(dev, "failed to create crtc.\n");
		return PTR_ERR(ctx->crtc);
	}

	drm_simple_encoder_init(drm_dev, encoder, DRM_MODE_ENCODER_TMDS);

	drm_encoder_helper_add(encoder, &exynos_vidi_encoder_helper_funcs);

	ret = exynos_drm_set_possible_crtcs(encoder, EXYNOS_DISPLAY_TYPE_VIDI);
	if (ret < 0)
		return ret;

	ret = vidi_create_connector(encoder);
	if (ret) {
		DRM_DEV_ERROR(dev, "failed to create connector ret = %d\n",
			      ret);
		drm_encoder_cleanup(encoder);
		return ret;
	}

	return 0;
}


static void vidi_unbind(struct device *dev, struct device *master, void *data)
{
	struct vidi_context *ctx = dev_get_drvdata(dev);

	del_timer_sync(&ctx->timer);
}

static const struct component_ops vidi_component_ops = {
	.bind	= vidi_bind,
	.unbind = vidi_unbind,
};

static int vidi_probe(struct platform_device *pdev)
{
	struct vidi_context *ctx;
	struct device *dev = &pdev->dev;

	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
	if (!ctx)
		return -ENOMEM;

	ctx->dev = dev;

	timer_setup(&ctx->timer, vidi_fake_vblank_timer, 0);

	mutex_init(&ctx->lock);

	platform_set_drvdata(pdev, ctx);

	return component_add(dev, &vidi_component_ops);
}

static int vidi_remove(struct platform_device *pdev)
{
	struct vidi_context *ctx = platform_get_drvdata(pdev);

	if (ctx->raw_edid != (struct edid *)fake_edid_info) {
		kfree(ctx->raw_edid);
		ctx->raw_edid = NULL;
	}

	component_del(&pdev->dev, &vidi_component_ops);

	return 0;
}

struct platform_driver vidi_driver = {
	.probe		= vidi_probe,
	.remove		= vidi_remove,
	.driver		= {
		.name	= "exynos-drm-vidi",
		.owner	= THIS_MODULE,
		.dev_groups = vidi_groups,
	},
};