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 #include <linux/timer.h>
19 
20 #include <drm/exynos_drm.h>
21 
22 #include <drm/drm_atomic_helper.h>
23 #include <drm/drm_edid.h>
24 #include <drm/drm_probe_helper.h>
25 
26 #include "exynos_drm_drv.h"
27 #include "exynos_drm_crtc.h"
28 #include "exynos_drm_fb.h"
29 #include "exynos_drm_plane.h"
30 #include "exynos_drm_vidi.h"
31 
32 /* VIDI uses fixed refresh rate of 50Hz */
33 #define VIDI_REFRESH_TIME (1000 / 50)
34 
35 /* vidi has totally three virtual windows. */
36 #define WINDOWS_NR		3
37 
38 #define ctx_from_connector(c)	container_of(c, struct vidi_context, \
39 					connector)
40 
41 struct vidi_context {
42 	struct drm_encoder		encoder;
43 	struct platform_device		*pdev;
44 	struct drm_device		*drm_dev;
45 	struct exynos_drm_crtc		*crtc;
46 	struct drm_connector		connector;
47 	struct exynos_drm_plane		planes[WINDOWS_NR];
48 	struct edid			*raw_edid;
49 	unsigned int			clkdiv;
50 	unsigned int			connected;
51 	bool				suspended;
52 	struct timer_list		timer;
53 	struct mutex			lock;
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 	mod_timer(&ctx->timer,
106 		jiffies + msecs_to_jiffies(VIDI_REFRESH_TIME) - 1);
107 
108 	return 0;
109 }
110 
111 static void vidi_disable_vblank(struct exynos_drm_crtc *crtc)
112 {
113 }
114 
115 static void vidi_update_plane(struct exynos_drm_crtc *crtc,
116 			      struct exynos_drm_plane *plane)
117 {
118 	struct drm_plane_state *state = plane->base.state;
119 	struct vidi_context *ctx = crtc->ctx;
120 	dma_addr_t addr;
121 
122 	if (ctx->suspended)
123 		return;
124 
125 	addr = exynos_drm_fb_dma_addr(state->fb, 0);
126 	DRM_DEBUG_KMS("dma_addr = %pad\n", &addr);
127 }
128 
129 static void vidi_enable(struct exynos_drm_crtc *crtc)
130 {
131 	struct vidi_context *ctx = crtc->ctx;
132 
133 	mutex_lock(&ctx->lock);
134 
135 	ctx->suspended = false;
136 
137 	mutex_unlock(&ctx->lock);
138 
139 	drm_crtc_vblank_on(&crtc->base);
140 }
141 
142 static void vidi_disable(struct exynos_drm_crtc *crtc)
143 {
144 	struct vidi_context *ctx = crtc->ctx;
145 
146 	drm_crtc_vblank_off(&crtc->base);
147 
148 	mutex_lock(&ctx->lock);
149 
150 	ctx->suspended = true;
151 
152 	mutex_unlock(&ctx->lock);
153 }
154 
155 static const struct exynos_drm_crtc_ops vidi_crtc_ops = {
156 	.enable = vidi_enable,
157 	.disable = vidi_disable,
158 	.enable_vblank = vidi_enable_vblank,
159 	.disable_vblank = vidi_disable_vblank,
160 	.update_plane = vidi_update_plane,
161 	.atomic_flush = exynos_crtc_handle_event,
162 };
163 
164 static void vidi_fake_vblank_timer(struct timer_list *t)
165 {
166 	struct vidi_context *ctx = from_timer(ctx, t, timer);
167 
168 	if (drm_crtc_handle_vblank(&ctx->crtc->base))
169 		mod_timer(&ctx->timer,
170 			jiffies + msecs_to_jiffies(VIDI_REFRESH_TIME) - 1);
171 }
172 
173 static ssize_t vidi_show_connection(struct device *dev,
174 				struct device_attribute *attr, char *buf)
175 {
176 	struct vidi_context *ctx = dev_get_drvdata(dev);
177 	int rc;
178 
179 	mutex_lock(&ctx->lock);
180 
181 	rc = sprintf(buf, "%d\n", ctx->connected);
182 
183 	mutex_unlock(&ctx->lock);
184 
185 	return rc;
186 }
187 
188 static ssize_t vidi_store_connection(struct device *dev,
189 				struct device_attribute *attr,
190 				const char *buf, size_t len)
191 {
192 	struct vidi_context *ctx = dev_get_drvdata(dev);
193 	int ret;
194 
195 	ret = kstrtoint(buf, 0, &ctx->connected);
196 	if (ret)
197 		return ret;
198 
199 	if (ctx->connected > 1)
200 		return -EINVAL;
201 
202 	/* use fake edid data for test. */
203 	if (!ctx->raw_edid)
204 		ctx->raw_edid = (struct edid *)fake_edid_info;
205 
206 	/* if raw_edid isn't same as fake data then it can't be tested. */
207 	if (ctx->raw_edid != (struct edid *)fake_edid_info) {
208 		DRM_DEBUG_KMS("edid data is not fake data.\n");
209 		return -EINVAL;
210 	}
211 
212 	DRM_DEBUG_KMS("requested connection.\n");
213 
214 	drm_helper_hpd_irq_event(ctx->drm_dev);
215 
216 	return len;
217 }
218 
219 static DEVICE_ATTR(connection, 0644, vidi_show_connection,
220 			vidi_store_connection);
221 
222 int vidi_connection_ioctl(struct drm_device *drm_dev, void *data,
223 				struct drm_file *file_priv)
224 {
225 	struct vidi_context *ctx = dev_get_drvdata(drm_dev->dev);
226 	struct drm_exynos_vidi_connection *vidi = data;
227 
228 	if (!vidi) {
229 		DRM_DEBUG_KMS("user data for vidi is null.\n");
230 		return -EINVAL;
231 	}
232 
233 	if (vidi->connection > 1) {
234 		DRM_DEBUG_KMS("connection should be 0 or 1.\n");
235 		return -EINVAL;
236 	}
237 
238 	if (ctx->connected == vidi->connection) {
239 		DRM_DEBUG_KMS("same connection request.\n");
240 		return -EINVAL;
241 	}
242 
243 	if (vidi->connection) {
244 		struct edid *raw_edid;
245 
246 		raw_edid = (struct edid *)(unsigned long)vidi->edid;
247 		if (!drm_edid_is_valid(raw_edid)) {
248 			DRM_DEBUG_KMS("edid data is invalid.\n");
249 			return -EINVAL;
250 		}
251 		ctx->raw_edid = drm_edid_duplicate(raw_edid);
252 		if (!ctx->raw_edid) {
253 			DRM_DEBUG_KMS("failed to allocate raw_edid.\n");
254 			return -ENOMEM;
255 		}
256 	} else {
257 		/*
258 		 * with connection = 0, free raw_edid
259 		 * only if raw edid data isn't same as fake data.
260 		 */
261 		if (ctx->raw_edid && ctx->raw_edid !=
262 				(struct edid *)fake_edid_info) {
263 			kfree(ctx->raw_edid);
264 			ctx->raw_edid = NULL;
265 		}
266 	}
267 
268 	ctx->connected = vidi->connection;
269 	drm_helper_hpd_irq_event(ctx->drm_dev);
270 
271 	return 0;
272 }
273 
274 static enum drm_connector_status vidi_detect(struct drm_connector *connector,
275 			bool force)
276 {
277 	struct vidi_context *ctx = ctx_from_connector(connector);
278 
279 	/*
280 	 * connection request would come from user side
281 	 * to do hotplug through specific ioctl.
282 	 */
283 	return ctx->connected ? connector_status_connected :
284 			connector_status_disconnected;
285 }
286 
287 static void vidi_connector_destroy(struct drm_connector *connector)
288 {
289 }
290 
291 static const struct drm_connector_funcs vidi_connector_funcs = {
292 	.fill_modes = drm_helper_probe_single_connector_modes,
293 	.detect = vidi_detect,
294 	.destroy = vidi_connector_destroy,
295 	.reset = drm_atomic_helper_connector_reset,
296 	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
297 	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
298 };
299 
300 static int vidi_get_modes(struct drm_connector *connector)
301 {
302 	struct vidi_context *ctx = ctx_from_connector(connector);
303 	struct edid *edid;
304 	int edid_len;
305 
306 	/*
307 	 * the edid data comes from user side and it would be set
308 	 * to ctx->raw_edid through specific ioctl.
309 	 */
310 	if (!ctx->raw_edid) {
311 		DRM_DEBUG_KMS("raw_edid is null.\n");
312 		return -EFAULT;
313 	}
314 
315 	edid_len = (1 + ctx->raw_edid->extensions) * EDID_LENGTH;
316 	edid = kmemdup(ctx->raw_edid, edid_len, GFP_KERNEL);
317 	if (!edid) {
318 		DRM_DEBUG_KMS("failed to allocate edid\n");
319 		return -ENOMEM;
320 	}
321 
322 	drm_connector_update_edid_property(connector, edid);
323 
324 	return drm_add_edid_modes(connector, edid);
325 }
326 
327 static const struct drm_connector_helper_funcs vidi_connector_helper_funcs = {
328 	.get_modes = vidi_get_modes,
329 };
330 
331 static int vidi_create_connector(struct drm_encoder *encoder)
332 {
333 	struct vidi_context *ctx = encoder_to_vidi(encoder);
334 	struct drm_connector *connector = &ctx->connector;
335 	int ret;
336 
337 	connector->polled = DRM_CONNECTOR_POLL_HPD;
338 
339 	ret = drm_connector_init(ctx->drm_dev, connector,
340 			&vidi_connector_funcs, DRM_MODE_CONNECTOR_VIRTUAL);
341 	if (ret) {
342 		DRM_ERROR("Failed to initialize connector with drm\n");
343 		return ret;
344 	}
345 
346 	drm_connector_helper_add(connector, &vidi_connector_helper_funcs);
347 	drm_connector_attach_encoder(connector, encoder);
348 
349 	return 0;
350 }
351 
352 static void exynos_vidi_mode_set(struct drm_encoder *encoder,
353 			       struct drm_display_mode *mode,
354 			       struct drm_display_mode *adjusted_mode)
355 {
356 }
357 
358 static void exynos_vidi_enable(struct drm_encoder *encoder)
359 {
360 }
361 
362 static void exynos_vidi_disable(struct drm_encoder *encoder)
363 {
364 }
365 
366 static const struct drm_encoder_helper_funcs exynos_vidi_encoder_helper_funcs = {
367 	.mode_set = exynos_vidi_mode_set,
368 	.enable = exynos_vidi_enable,
369 	.disable = exynos_vidi_disable,
370 };
371 
372 static const struct drm_encoder_funcs exynos_vidi_encoder_funcs = {
373 	.destroy = drm_encoder_cleanup,
374 };
375 
376 static int vidi_bind(struct device *dev, struct device *master, void *data)
377 {
378 	struct vidi_context *ctx = dev_get_drvdata(dev);
379 	struct drm_device *drm_dev = data;
380 	struct drm_encoder *encoder = &ctx->encoder;
381 	struct exynos_drm_plane *exynos_plane;
382 	struct exynos_drm_plane_config plane_config = { 0 };
383 	unsigned int i;
384 	int ret;
385 
386 	ctx->drm_dev = drm_dev;
387 
388 	plane_config.pixel_formats = formats;
389 	plane_config.num_pixel_formats = ARRAY_SIZE(formats);
390 
391 	for (i = 0; i < WINDOWS_NR; i++) {
392 		plane_config.zpos = i;
393 		plane_config.type = vidi_win_types[i];
394 
395 		ret = exynos_plane_init(drm_dev, &ctx->planes[i], i,
396 					&plane_config);
397 		if (ret)
398 			return ret;
399 	}
400 
401 	exynos_plane = &ctx->planes[DEFAULT_WIN];
402 	ctx->crtc = exynos_drm_crtc_create(drm_dev, &exynos_plane->base,
403 			EXYNOS_DISPLAY_TYPE_VIDI, &vidi_crtc_ops, ctx);
404 	if (IS_ERR(ctx->crtc)) {
405 		DRM_ERROR("failed to create crtc.\n");
406 		return PTR_ERR(ctx->crtc);
407 	}
408 
409 	drm_encoder_init(drm_dev, encoder, &exynos_vidi_encoder_funcs,
410 			 DRM_MODE_ENCODER_TMDS, NULL);
411 
412 	drm_encoder_helper_add(encoder, &exynos_vidi_encoder_helper_funcs);
413 
414 	ret = exynos_drm_set_possible_crtcs(encoder, EXYNOS_DISPLAY_TYPE_VIDI);
415 	if (ret < 0)
416 		return ret;
417 
418 	ret = vidi_create_connector(encoder);
419 	if (ret) {
420 		DRM_ERROR("failed to create connector ret = %d\n", ret);
421 		drm_encoder_cleanup(encoder);
422 		return ret;
423 	}
424 
425 	return 0;
426 }
427 
428 
429 static void vidi_unbind(struct device *dev, struct device *master, void *data)
430 {
431 	struct vidi_context *ctx = dev_get_drvdata(dev);
432 
433 	del_timer_sync(&ctx->timer);
434 }
435 
436 static const struct component_ops vidi_component_ops = {
437 	.bind	= vidi_bind,
438 	.unbind = vidi_unbind,
439 };
440 
441 static int vidi_probe(struct platform_device *pdev)
442 {
443 	struct vidi_context *ctx;
444 	int ret;
445 
446 	ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
447 	if (!ctx)
448 		return -ENOMEM;
449 
450 	ctx->pdev = pdev;
451 
452 	timer_setup(&ctx->timer, vidi_fake_vblank_timer, 0);
453 
454 	mutex_init(&ctx->lock);
455 
456 	platform_set_drvdata(pdev, ctx);
457 
458 	ret = device_create_file(&pdev->dev, &dev_attr_connection);
459 	if (ret < 0) {
460 		DRM_ERROR("failed to create connection sysfs.\n");
461 		return ret;
462 	}
463 
464 	ret = component_add(&pdev->dev, &vidi_component_ops);
465 	if (ret)
466 		goto err_remove_file;
467 
468 	return ret;
469 
470 err_remove_file:
471 	device_remove_file(&pdev->dev, &dev_attr_connection);
472 
473 	return ret;
474 }
475 
476 static int vidi_remove(struct platform_device *pdev)
477 {
478 	struct vidi_context *ctx = platform_get_drvdata(pdev);
479 
480 	if (ctx->raw_edid != (struct edid *)fake_edid_info) {
481 		kfree(ctx->raw_edid);
482 		ctx->raw_edid = NULL;
483 
484 		return -EINVAL;
485 	}
486 
487 	component_del(&pdev->dev, &vidi_component_ops);
488 
489 	return 0;
490 }
491 
492 struct platform_driver vidi_driver = {
493 	.probe		= vidi_probe,
494 	.remove		= vidi_remove,
495 	.driver		= {
496 		.name	= "exynos-drm-vidi",
497 		.owner	= THIS_MODULE,
498 	},
499 };
500