1 /* exynos_drm_vidi.c
2  *
3  * Copyright (C) 2012 Samsung Electronics Co.Ltd
4  * Authors:
5  *	Inki Dae <inki.dae@samsung.com>
6  *
7  * This program is free software; you can redistribute  it and/or modify it
8  * under  the terms of  the GNU General  Public License as published by the
9  * Free Software Foundation;  either version 2 of the  License, or (at your
10  * option) any later version.
11  *
12  */
13 #include <drm/drmP.h>
14 
15 #include <linux/kernel.h>
16 #include <linux/platform_device.h>
17 #include <linux/component.h>
18 
19 #include <drm/exynos_drm.h>
20 
21 #include <drm/drm_edid.h>
22 #include <drm/drm_crtc_helper.h>
23 #include <drm/drm_atomic_helper.h>
24 
25 #include "exynos_drm_drv.h"
26 #include "exynos_drm_crtc.h"
27 #include "exynos_drm_fb.h"
28 #include "exynos_drm_plane.h"
29 #include "exynos_drm_vidi.h"
30 
31 /* vidi has totally three virtual windows. */
32 #define WINDOWS_NR		3
33 
34 #define ctx_from_connector(c)	container_of(c, struct vidi_context, \
35 					connector)
36 
37 struct vidi_context {
38 	struct drm_encoder		encoder;
39 	struct platform_device		*pdev;
40 	struct drm_device		*drm_dev;
41 	struct exynos_drm_crtc		*crtc;
42 	struct drm_connector		connector;
43 	struct exynos_drm_plane		planes[WINDOWS_NR];
44 	struct edid			*raw_edid;
45 	unsigned int			clkdiv;
46 	unsigned long			irq_flags;
47 	unsigned int			connected;
48 	bool				vblank_on;
49 	bool				suspended;
50 	bool				direct_vblank;
51 	struct work_struct		work;
52 	struct mutex			lock;
53 	int				pipe;
54 };
55 
56 static inline struct vidi_context *encoder_to_vidi(struct drm_encoder *e)
57 {
58 	return container_of(e, struct vidi_context, encoder);
59 }
60 
61 static const char fake_edid_info[] = {
62 	0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x4c, 0x2d, 0x05, 0x05,
63 	0x00, 0x00, 0x00, 0x00, 0x30, 0x12, 0x01, 0x03, 0x80, 0x10, 0x09, 0x78,
64 	0x0a, 0xee, 0x91, 0xa3, 0x54, 0x4c, 0x99, 0x26, 0x0f, 0x50, 0x54, 0xbd,
65 	0xee, 0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
66 	0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x66, 0x21, 0x50, 0xb0, 0x51, 0x00,
67 	0x1b, 0x30, 0x40, 0x70, 0x36, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e,
68 	0x01, 0x1d, 0x00, 0x72, 0x51, 0xd0, 0x1e, 0x20, 0x6e, 0x28, 0x55, 0x00,
69 	0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x18,
70 	0x4b, 0x1a, 0x44, 0x17, 0x00, 0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
71 	0x00, 0x00, 0x00, 0xfc, 0x00, 0x53, 0x41, 0x4d, 0x53, 0x55, 0x4e, 0x47,
72 	0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x01, 0xbc, 0x02, 0x03, 0x1e, 0xf1,
73 	0x46, 0x84, 0x05, 0x03, 0x10, 0x20, 0x22, 0x23, 0x09, 0x07, 0x07, 0x83,
74 	0x01, 0x00, 0x00, 0xe2, 0x00, 0x0f, 0x67, 0x03, 0x0c, 0x00, 0x10, 0x00,
75 	0xb8, 0x2d, 0x01, 0x1d, 0x80, 0x18, 0x71, 0x1c, 0x16, 0x20, 0x58, 0x2c,
76 	0x25, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x9e, 0x8c, 0x0a, 0xd0, 0x8a,
77 	0x20, 0xe0, 0x2d, 0x10, 0x10, 0x3e, 0x96, 0x00, 0xa0, 0x5a, 0x00, 0x00,
78 	0x00, 0x18, 0x02, 0x3a, 0x80, 0x18, 0x71, 0x38, 0x2d, 0x40, 0x58, 0x2c,
79 	0x45, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e, 0x00, 0x00, 0x00, 0x00,
80 	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
81 	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
82 	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
83 	0x00, 0x00, 0x00, 0x06
84 };
85 
86 static const uint32_t formats[] = {
87 	DRM_FORMAT_XRGB8888,
88 	DRM_FORMAT_ARGB8888,
89 	DRM_FORMAT_NV12,
90 };
91 
92 static const enum drm_plane_type vidi_win_types[WINDOWS_NR] = {
93 	DRM_PLANE_TYPE_PRIMARY,
94 	DRM_PLANE_TYPE_OVERLAY,
95 	DRM_PLANE_TYPE_CURSOR,
96 };
97 
98 static int vidi_enable_vblank(struct exynos_drm_crtc *crtc)
99 {
100 	struct vidi_context *ctx = crtc->ctx;
101 
102 	if (ctx->suspended)
103 		return -EPERM;
104 
105 	if (!test_and_set_bit(0, &ctx->irq_flags))
106 		ctx->vblank_on = true;
107 
108 	ctx->direct_vblank = true;
109 
110 	/*
111 	 * in case of page flip request, vidi_finish_pageflip function
112 	 * will not be called because direct_vblank is true and then
113 	 * that function will be called by crtc_ops->update_plane callback
114 	 */
115 	schedule_work(&ctx->work);
116 
117 	return 0;
118 }
119 
120 static void vidi_disable_vblank(struct exynos_drm_crtc *crtc)
121 {
122 	struct vidi_context *ctx = crtc->ctx;
123 
124 	if (ctx->suspended)
125 		return;
126 
127 	if (test_and_clear_bit(0, &ctx->irq_flags))
128 		ctx->vblank_on = false;
129 }
130 
131 static void vidi_update_plane(struct exynos_drm_crtc *crtc,
132 			      struct exynos_drm_plane *plane)
133 {
134 	struct drm_plane_state *state = plane->base.state;
135 	struct vidi_context *ctx = crtc->ctx;
136 	dma_addr_t addr;
137 
138 	if (ctx->suspended)
139 		return;
140 
141 	addr = exynos_drm_fb_dma_addr(state->fb, 0);
142 	DRM_DEBUG_KMS("dma_addr = %pad\n", &addr);
143 
144 	if (ctx->vblank_on)
145 		schedule_work(&ctx->work);
146 }
147 
148 static void vidi_enable(struct exynos_drm_crtc *crtc)
149 {
150 	struct vidi_context *ctx = crtc->ctx;
151 
152 	mutex_lock(&ctx->lock);
153 
154 	ctx->suspended = false;
155 
156 	/* if vblank was enabled status, enable it again. */
157 	if (test_and_clear_bit(0, &ctx->irq_flags))
158 		vidi_enable_vblank(ctx->crtc);
159 
160 	mutex_unlock(&ctx->lock);
161 }
162 
163 static void vidi_disable(struct exynos_drm_crtc *crtc)
164 {
165 	struct vidi_context *ctx = crtc->ctx;
166 
167 	mutex_lock(&ctx->lock);
168 
169 	ctx->suspended = true;
170 
171 	mutex_unlock(&ctx->lock);
172 }
173 
174 static int vidi_ctx_initialize(struct vidi_context *ctx,
175 			struct drm_device *drm_dev)
176 {
177 	struct exynos_drm_private *priv = drm_dev->dev_private;
178 
179 	ctx->drm_dev = drm_dev;
180 	ctx->pipe = priv->pipe++;
181 
182 	return 0;
183 }
184 
185 static const struct exynos_drm_crtc_ops vidi_crtc_ops = {
186 	.enable = vidi_enable,
187 	.disable = vidi_disable,
188 	.enable_vblank = vidi_enable_vblank,
189 	.disable_vblank = vidi_disable_vblank,
190 	.update_plane = vidi_update_plane,
191 };
192 
193 static void vidi_fake_vblank_handler(struct work_struct *work)
194 {
195 	struct vidi_context *ctx = container_of(work, struct vidi_context,
196 					work);
197 	int win;
198 
199 	if (ctx->pipe < 0)
200 		return;
201 
202 	/* refresh rate is about 50Hz. */
203 	usleep_range(16000, 20000);
204 
205 	mutex_lock(&ctx->lock);
206 
207 	if (ctx->direct_vblank) {
208 		drm_crtc_handle_vblank(&ctx->crtc->base);
209 		ctx->direct_vblank = false;
210 		mutex_unlock(&ctx->lock);
211 		return;
212 	}
213 
214 	mutex_unlock(&ctx->lock);
215 
216 	for (win = 0 ; win < WINDOWS_NR ; win++) {
217 		struct exynos_drm_plane *plane = &ctx->planes[win];
218 
219 		if (!plane->pending_fb)
220 			continue;
221 
222 		exynos_drm_crtc_finish_update(ctx->crtc, plane);
223 	}
224 }
225 
226 static int vidi_show_connection(struct device *dev,
227 				struct device_attribute *attr, char *buf)
228 {
229 	struct vidi_context *ctx = dev_get_drvdata(dev);
230 	int rc;
231 
232 	mutex_lock(&ctx->lock);
233 
234 	rc = sprintf(buf, "%d\n", ctx->connected);
235 
236 	mutex_unlock(&ctx->lock);
237 
238 	return rc;
239 }
240 
241 static int vidi_store_connection(struct device *dev,
242 				struct device_attribute *attr,
243 				const char *buf, size_t len)
244 {
245 	struct vidi_context *ctx = dev_get_drvdata(dev);
246 	int ret;
247 
248 	ret = kstrtoint(buf, 0, &ctx->connected);
249 	if (ret)
250 		return ret;
251 
252 	if (ctx->connected > 1)
253 		return -EINVAL;
254 
255 	/* use fake edid data for test. */
256 	if (!ctx->raw_edid)
257 		ctx->raw_edid = (struct edid *)fake_edid_info;
258 
259 	/* if raw_edid isn't same as fake data then it can't be tested. */
260 	if (ctx->raw_edid != (struct edid *)fake_edid_info) {
261 		DRM_DEBUG_KMS("edid data is not fake data.\n");
262 		return -EINVAL;
263 	}
264 
265 	DRM_DEBUG_KMS("requested connection.\n");
266 
267 	drm_helper_hpd_irq_event(ctx->drm_dev);
268 
269 	return len;
270 }
271 
272 static DEVICE_ATTR(connection, 0644, vidi_show_connection,
273 			vidi_store_connection);
274 
275 int vidi_connection_ioctl(struct drm_device *drm_dev, void *data,
276 				struct drm_file *file_priv)
277 {
278 	struct vidi_context *ctx = dev_get_drvdata(drm_dev->dev);
279 	struct drm_exynos_vidi_connection *vidi = data;
280 
281 	if (!vidi) {
282 		DRM_DEBUG_KMS("user data for vidi is null.\n");
283 		return -EINVAL;
284 	}
285 
286 	if (vidi->connection > 1) {
287 		DRM_DEBUG_KMS("connection should be 0 or 1.\n");
288 		return -EINVAL;
289 	}
290 
291 	if (ctx->connected == vidi->connection) {
292 		DRM_DEBUG_KMS("same connection request.\n");
293 		return -EINVAL;
294 	}
295 
296 	if (vidi->connection) {
297 		struct edid *raw_edid  = (struct edid *)(uint32_t)vidi->edid;
298 		if (!drm_edid_is_valid(raw_edid)) {
299 			DRM_DEBUG_KMS("edid data is invalid.\n");
300 			return -EINVAL;
301 		}
302 		ctx->raw_edid = drm_edid_duplicate(raw_edid);
303 		if (!ctx->raw_edid) {
304 			DRM_DEBUG_KMS("failed to allocate raw_edid.\n");
305 			return -ENOMEM;
306 		}
307 	} else {
308 		/*
309 		 * with connection = 0, free raw_edid
310 		 * only if raw edid data isn't same as fake data.
311 		 */
312 		if (ctx->raw_edid && ctx->raw_edid !=
313 				(struct edid *)fake_edid_info) {
314 			kfree(ctx->raw_edid);
315 			ctx->raw_edid = NULL;
316 		}
317 	}
318 
319 	ctx->connected = vidi->connection;
320 	drm_helper_hpd_irq_event(ctx->drm_dev);
321 
322 	return 0;
323 }
324 
325 static enum drm_connector_status vidi_detect(struct drm_connector *connector,
326 			bool force)
327 {
328 	struct vidi_context *ctx = ctx_from_connector(connector);
329 
330 	/*
331 	 * connection request would come from user side
332 	 * to do hotplug through specific ioctl.
333 	 */
334 	return ctx->connected ? connector_status_connected :
335 			connector_status_disconnected;
336 }
337 
338 static void vidi_connector_destroy(struct drm_connector *connector)
339 {
340 }
341 
342 static const struct drm_connector_funcs vidi_connector_funcs = {
343 	.dpms = drm_atomic_helper_connector_dpms,
344 	.fill_modes = drm_helper_probe_single_connector_modes,
345 	.detect = vidi_detect,
346 	.destroy = vidi_connector_destroy,
347 	.reset = drm_atomic_helper_connector_reset,
348 	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
349 	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
350 };
351 
352 static int vidi_get_modes(struct drm_connector *connector)
353 {
354 	struct vidi_context *ctx = ctx_from_connector(connector);
355 	struct edid *edid;
356 	int edid_len;
357 
358 	/*
359 	 * the edid data comes from user side and it would be set
360 	 * to ctx->raw_edid through specific ioctl.
361 	 */
362 	if (!ctx->raw_edid) {
363 		DRM_DEBUG_KMS("raw_edid is null.\n");
364 		return -EFAULT;
365 	}
366 
367 	edid_len = (1 + ctx->raw_edid->extensions) * EDID_LENGTH;
368 	edid = kmemdup(ctx->raw_edid, edid_len, GFP_KERNEL);
369 	if (!edid) {
370 		DRM_DEBUG_KMS("failed to allocate edid\n");
371 		return -ENOMEM;
372 	}
373 
374 	drm_mode_connector_update_edid_property(connector, edid);
375 
376 	return drm_add_edid_modes(connector, edid);
377 }
378 
379 static struct drm_encoder *vidi_best_encoder(struct drm_connector *connector)
380 {
381 	struct vidi_context *ctx = ctx_from_connector(connector);
382 
383 	return &ctx->encoder;
384 }
385 
386 static const struct drm_connector_helper_funcs vidi_connector_helper_funcs = {
387 	.get_modes = vidi_get_modes,
388 	.best_encoder = vidi_best_encoder,
389 };
390 
391 static int vidi_create_connector(struct drm_encoder *encoder)
392 {
393 	struct vidi_context *ctx = encoder_to_vidi(encoder);
394 	struct drm_connector *connector = &ctx->connector;
395 	int ret;
396 
397 	connector->polled = DRM_CONNECTOR_POLL_HPD;
398 
399 	ret = drm_connector_init(ctx->drm_dev, connector,
400 			&vidi_connector_funcs, DRM_MODE_CONNECTOR_VIRTUAL);
401 	if (ret) {
402 		DRM_ERROR("Failed to initialize connector with drm\n");
403 		return ret;
404 	}
405 
406 	drm_connector_helper_add(connector, &vidi_connector_helper_funcs);
407 	drm_connector_register(connector);
408 	drm_mode_connector_attach_encoder(connector, encoder);
409 
410 	return 0;
411 }
412 
413 static bool exynos_vidi_mode_fixup(struct drm_encoder *encoder,
414 				 const struct drm_display_mode *mode,
415 				 struct drm_display_mode *adjusted_mode)
416 {
417 	return true;
418 }
419 
420 static void exynos_vidi_mode_set(struct drm_encoder *encoder,
421 			       struct drm_display_mode *mode,
422 			       struct drm_display_mode *adjusted_mode)
423 {
424 }
425 
426 static void exynos_vidi_enable(struct drm_encoder *encoder)
427 {
428 }
429 
430 static void exynos_vidi_disable(struct drm_encoder *encoder)
431 {
432 }
433 
434 static const struct drm_encoder_helper_funcs exynos_vidi_encoder_helper_funcs = {
435 	.mode_fixup = exynos_vidi_mode_fixup,
436 	.mode_set = exynos_vidi_mode_set,
437 	.enable = exynos_vidi_enable,
438 	.disable = exynos_vidi_disable,
439 };
440 
441 static const struct drm_encoder_funcs exynos_vidi_encoder_funcs = {
442 	.destroy = drm_encoder_cleanup,
443 };
444 
445 static int vidi_bind(struct device *dev, struct device *master, void *data)
446 {
447 	struct vidi_context *ctx = dev_get_drvdata(dev);
448 	struct drm_device *drm_dev = data;
449 	struct drm_encoder *encoder = &ctx->encoder;
450 	struct exynos_drm_plane *exynos_plane;
451 	struct exynos_drm_plane_config plane_config = { 0 };
452 	unsigned int i;
453 	int pipe, ret;
454 
455 	vidi_ctx_initialize(ctx, drm_dev);
456 
457 	plane_config.pixel_formats = formats;
458 	plane_config.num_pixel_formats = ARRAY_SIZE(formats);
459 
460 	for (i = 0; i < WINDOWS_NR; i++) {
461 		plane_config.zpos = i;
462 		plane_config.type = vidi_win_types[i];
463 
464 		ret = exynos_plane_init(drm_dev, &ctx->planes[i], i,
465 					1 << ctx->pipe, &plane_config);
466 		if (ret)
467 			return ret;
468 	}
469 
470 	exynos_plane = &ctx->planes[DEFAULT_WIN];
471 	ctx->crtc = exynos_drm_crtc_create(drm_dev, &exynos_plane->base,
472 					   ctx->pipe, EXYNOS_DISPLAY_TYPE_VIDI,
473 					   &vidi_crtc_ops, ctx);
474 	if (IS_ERR(ctx->crtc)) {
475 		DRM_ERROR("failed to create crtc.\n");
476 		return PTR_ERR(ctx->crtc);
477 	}
478 
479 	pipe = exynos_drm_crtc_get_pipe_from_type(drm_dev,
480 						  EXYNOS_DISPLAY_TYPE_VIDI);
481 	if (pipe < 0)
482 		return pipe;
483 
484 	encoder->possible_crtcs = 1 << pipe;
485 
486 	DRM_DEBUG_KMS("possible_crtcs = 0x%x\n", encoder->possible_crtcs);
487 
488 	drm_encoder_init(drm_dev, encoder, &exynos_vidi_encoder_funcs,
489 			 DRM_MODE_ENCODER_TMDS, NULL);
490 
491 	drm_encoder_helper_add(encoder, &exynos_vidi_encoder_helper_funcs);
492 
493 	ret = vidi_create_connector(encoder);
494 	if (ret) {
495 		DRM_ERROR("failed to create connector ret = %d\n", ret);
496 		drm_encoder_cleanup(encoder);
497 		return ret;
498 	}
499 
500 	return 0;
501 }
502 
503 
504 static void vidi_unbind(struct device *dev, struct device *master, void *data)
505 {
506 }
507 
508 static const struct component_ops vidi_component_ops = {
509 	.bind	= vidi_bind,
510 	.unbind = vidi_unbind,
511 };
512 
513 static int vidi_probe(struct platform_device *pdev)
514 {
515 	struct vidi_context *ctx;
516 	int ret;
517 
518 	ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
519 	if (!ctx)
520 		return -ENOMEM;
521 
522 	ctx->pdev = pdev;
523 
524 	INIT_WORK(&ctx->work, vidi_fake_vblank_handler);
525 
526 	mutex_init(&ctx->lock);
527 
528 	platform_set_drvdata(pdev, ctx);
529 
530 	ret = device_create_file(&pdev->dev, &dev_attr_connection);
531 	if (ret < 0) {
532 		DRM_ERROR("failed to create connection sysfs.\n");
533 		return ret;
534 	}
535 
536 	ret = component_add(&pdev->dev, &vidi_component_ops);
537 	if (ret)
538 		goto err_remove_file;
539 
540 	return ret;
541 
542 err_remove_file:
543 	device_remove_file(&pdev->dev, &dev_attr_connection);
544 
545 	return ret;
546 }
547 
548 static int vidi_remove(struct platform_device *pdev)
549 {
550 	struct vidi_context *ctx = platform_get_drvdata(pdev);
551 
552 	if (ctx->raw_edid != (struct edid *)fake_edid_info) {
553 		kfree(ctx->raw_edid);
554 		ctx->raw_edid = NULL;
555 
556 		return -EINVAL;
557 	}
558 
559 	component_del(&pdev->dev, &vidi_component_ops);
560 
561 	return 0;
562 }
563 
564 struct platform_driver vidi_driver = {
565 	.probe		= vidi_probe,
566 	.remove		= vidi_remove,
567 	.driver		= {
568 		.name	= "exynos-drm-vidi",
569 		.owner	= THIS_MODULE,
570 	},
571 };
572