1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* exynos_drm_vidi.c
3 *
4 * Copyright (C) 2012 Samsung Electronics Co.Ltd
5 * Authors:
6 * Inki Dae <inki.dae@samsung.com>
7 */
8
9 #include <linux/component.h>
10 #include <linux/kernel.h>
11 #include <linux/platform_device.h>
12 #include <linux/timer.h>
13
14 #include <drm/drm_atomic_helper.h>
15 #include <drm/drm_edid.h>
16 #include <drm/drm_framebuffer.h>
17 #include <drm/drm_probe_helper.h>
18 #include <drm/drm_simple_kms_helper.h>
19 #include <drm/drm_vblank.h>
20 #include <drm/exynos_drm.h>
21
22 #include "exynos_drm_crtc.h"
23 #include "exynos_drm_drv.h"
24 #include "exynos_drm_fb.h"
25 #include "exynos_drm_plane.h"
26 #include "exynos_drm_vidi.h"
27
28 /* VIDI uses fixed refresh rate of 50Hz */
29 #define VIDI_REFRESH_TIME (1000 / 50)
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 drm_device *drm_dev;
40 struct device *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 int connected;
47 bool suspended;
48 struct timer_list timer;
49 struct mutex lock;
50 };
51
encoder_to_vidi(struct drm_encoder * e)52 static inline struct vidi_context *encoder_to_vidi(struct drm_encoder *e)
53 {
54 return container_of(e, struct vidi_context, encoder);
55 }
56
57 static const char fake_edid_info[] = {
58 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x4c, 0x2d, 0x05, 0x05,
59 0x00, 0x00, 0x00, 0x00, 0x30, 0x12, 0x01, 0x03, 0x80, 0x10, 0x09, 0x78,
60 0x0a, 0xee, 0x91, 0xa3, 0x54, 0x4c, 0x99, 0x26, 0x0f, 0x50, 0x54, 0xbd,
61 0xee, 0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
62 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x66, 0x21, 0x50, 0xb0, 0x51, 0x00,
63 0x1b, 0x30, 0x40, 0x70, 0x36, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e,
64 0x01, 0x1d, 0x00, 0x72, 0x51, 0xd0, 0x1e, 0x20, 0x6e, 0x28, 0x55, 0x00,
65 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x18,
66 0x4b, 0x1a, 0x44, 0x17, 0x00, 0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
67 0x00, 0x00, 0x00, 0xfc, 0x00, 0x53, 0x41, 0x4d, 0x53, 0x55, 0x4e, 0x47,
68 0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x01, 0xbc, 0x02, 0x03, 0x1e, 0xf1,
69 0x46, 0x84, 0x05, 0x03, 0x10, 0x20, 0x22, 0x23, 0x09, 0x07, 0x07, 0x83,
70 0x01, 0x00, 0x00, 0xe2, 0x00, 0x0f, 0x67, 0x03, 0x0c, 0x00, 0x10, 0x00,
71 0xb8, 0x2d, 0x01, 0x1d, 0x80, 0x18, 0x71, 0x1c, 0x16, 0x20, 0x58, 0x2c,
72 0x25, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x9e, 0x8c, 0x0a, 0xd0, 0x8a,
73 0x20, 0xe0, 0x2d, 0x10, 0x10, 0x3e, 0x96, 0x00, 0xa0, 0x5a, 0x00, 0x00,
74 0x00, 0x18, 0x02, 0x3a, 0x80, 0x18, 0x71, 0x38, 0x2d, 0x40, 0x58, 0x2c,
75 0x45, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e, 0x00, 0x00, 0x00, 0x00,
76 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
77 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
78 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
79 0x00, 0x00, 0x00, 0x06
80 };
81
82 static const uint32_t formats[] = {
83 DRM_FORMAT_XRGB8888,
84 DRM_FORMAT_ARGB8888,
85 DRM_FORMAT_NV12,
86 };
87
88 static const enum drm_plane_type vidi_win_types[WINDOWS_NR] = {
89 DRM_PLANE_TYPE_PRIMARY,
90 DRM_PLANE_TYPE_OVERLAY,
91 DRM_PLANE_TYPE_CURSOR,
92 };
93
vidi_enable_vblank(struct exynos_drm_crtc * crtc)94 static int vidi_enable_vblank(struct exynos_drm_crtc *crtc)
95 {
96 struct vidi_context *ctx = crtc->ctx;
97
98 if (ctx->suspended)
99 return -EPERM;
100
101 mod_timer(&ctx->timer,
102 jiffies + msecs_to_jiffies(VIDI_REFRESH_TIME) - 1);
103
104 return 0;
105 }
106
vidi_disable_vblank(struct exynos_drm_crtc * crtc)107 static void vidi_disable_vblank(struct exynos_drm_crtc *crtc)
108 {
109 }
110
vidi_update_plane(struct exynos_drm_crtc * crtc,struct exynos_drm_plane * plane)111 static void vidi_update_plane(struct exynos_drm_crtc *crtc,
112 struct exynos_drm_plane *plane)
113 {
114 struct drm_plane_state *state = plane->base.state;
115 struct vidi_context *ctx = crtc->ctx;
116 dma_addr_t addr;
117
118 if (ctx->suspended)
119 return;
120
121 addr = exynos_drm_fb_dma_addr(state->fb, 0);
122 DRM_DEV_DEBUG_KMS(ctx->dev, "dma_addr = %pad\n", &addr);
123 }
124
vidi_atomic_enable(struct exynos_drm_crtc * crtc)125 static void vidi_atomic_enable(struct exynos_drm_crtc *crtc)
126 {
127 struct vidi_context *ctx = crtc->ctx;
128
129 mutex_lock(&ctx->lock);
130
131 ctx->suspended = false;
132
133 mutex_unlock(&ctx->lock);
134
135 drm_crtc_vblank_on(&crtc->base);
136 }
137
vidi_atomic_disable(struct exynos_drm_crtc * crtc)138 static void vidi_atomic_disable(struct exynos_drm_crtc *crtc)
139 {
140 struct vidi_context *ctx = crtc->ctx;
141
142 drm_crtc_vblank_off(&crtc->base);
143
144 mutex_lock(&ctx->lock);
145
146 ctx->suspended = true;
147
148 mutex_unlock(&ctx->lock);
149 }
150
151 static const struct exynos_drm_crtc_ops vidi_crtc_ops = {
152 .atomic_enable = vidi_atomic_enable,
153 .atomic_disable = vidi_atomic_disable,
154 .enable_vblank = vidi_enable_vblank,
155 .disable_vblank = vidi_disable_vblank,
156 .update_plane = vidi_update_plane,
157 .atomic_flush = exynos_crtc_handle_event,
158 };
159
vidi_fake_vblank_timer(struct timer_list * t)160 static void vidi_fake_vblank_timer(struct timer_list *t)
161 {
162 struct vidi_context *ctx = from_timer(ctx, t, timer);
163
164 if (drm_crtc_handle_vblank(&ctx->crtc->base))
165 mod_timer(&ctx->timer,
166 jiffies + msecs_to_jiffies(VIDI_REFRESH_TIME) - 1);
167 }
168
vidi_show_connection(struct device * dev,struct device_attribute * attr,char * buf)169 static ssize_t vidi_show_connection(struct device *dev,
170 struct device_attribute *attr, char *buf)
171 {
172 struct vidi_context *ctx = dev_get_drvdata(dev);
173 int rc;
174
175 mutex_lock(&ctx->lock);
176
177 rc = sprintf(buf, "%d\n", ctx->connected);
178
179 mutex_unlock(&ctx->lock);
180
181 return rc;
182 }
183
vidi_store_connection(struct device * dev,struct device_attribute * attr,const char * buf,size_t len)184 static ssize_t vidi_store_connection(struct device *dev,
185 struct device_attribute *attr,
186 const char *buf, size_t len)
187 {
188 struct vidi_context *ctx = dev_get_drvdata(dev);
189 int ret;
190
191 ret = kstrtoint(buf, 0, &ctx->connected);
192 if (ret)
193 return ret;
194
195 if (ctx->connected > 1)
196 return -EINVAL;
197
198 /* use fake edid data for test. */
199 if (!ctx->raw_edid)
200 ctx->raw_edid = (struct edid *)fake_edid_info;
201
202 /* if raw_edid isn't same as fake data then it can't be tested. */
203 if (ctx->raw_edid != (struct edid *)fake_edid_info) {
204 DRM_DEV_DEBUG_KMS(dev, "edid data is not fake data.\n");
205 return -EINVAL;
206 }
207
208 DRM_DEV_DEBUG_KMS(dev, "requested connection.\n");
209
210 drm_helper_hpd_irq_event(ctx->drm_dev);
211
212 return len;
213 }
214
215 static DEVICE_ATTR(connection, 0644, vidi_show_connection,
216 vidi_store_connection);
217
218 static struct attribute *vidi_attrs[] = {
219 &dev_attr_connection.attr,
220 NULL,
221 };
222 ATTRIBUTE_GROUPS(vidi);
223
vidi_connection_ioctl(struct drm_device * drm_dev,void * data,struct drm_file * file_priv)224 int vidi_connection_ioctl(struct drm_device *drm_dev, void *data,
225 struct drm_file *file_priv)
226 {
227 struct vidi_context *ctx = dev_get_drvdata(drm_dev->dev);
228 struct drm_exynos_vidi_connection *vidi = data;
229
230 if (!vidi) {
231 DRM_DEV_DEBUG_KMS(ctx->dev,
232 "user data for vidi is null.\n");
233 return -EINVAL;
234 }
235
236 if (vidi->connection > 1) {
237 DRM_DEV_DEBUG_KMS(ctx->dev,
238 "connection should be 0 or 1.\n");
239 return -EINVAL;
240 }
241
242 if (ctx->connected == vidi->connection) {
243 DRM_DEV_DEBUG_KMS(ctx->dev,
244 "same connection request.\n");
245 return -EINVAL;
246 }
247
248 if (vidi->connection) {
249 struct edid *raw_edid;
250
251 raw_edid = (struct edid *)(unsigned long)vidi->edid;
252 if (!drm_edid_is_valid(raw_edid)) {
253 DRM_DEV_DEBUG_KMS(ctx->dev,
254 "edid data is invalid.\n");
255 return -EINVAL;
256 }
257 ctx->raw_edid = drm_edid_duplicate(raw_edid);
258 if (!ctx->raw_edid) {
259 DRM_DEV_DEBUG_KMS(ctx->dev,
260 "failed to allocate raw_edid.\n");
261 return -ENOMEM;
262 }
263 } else {
264 /*
265 * with connection = 0, free raw_edid
266 * only if raw edid data isn't same as fake data.
267 */
268 if (ctx->raw_edid && ctx->raw_edid !=
269 (struct edid *)fake_edid_info) {
270 kfree(ctx->raw_edid);
271 ctx->raw_edid = NULL;
272 }
273 }
274
275 ctx->connected = vidi->connection;
276 drm_helper_hpd_irq_event(ctx->drm_dev);
277
278 return 0;
279 }
280
vidi_detect(struct drm_connector * connector,bool force)281 static enum drm_connector_status vidi_detect(struct drm_connector *connector,
282 bool force)
283 {
284 struct vidi_context *ctx = ctx_from_connector(connector);
285
286 /*
287 * connection request would come from user side
288 * to do hotplug through specific ioctl.
289 */
290 return ctx->connected ? connector_status_connected :
291 connector_status_disconnected;
292 }
293
vidi_connector_destroy(struct drm_connector * connector)294 static void vidi_connector_destroy(struct drm_connector *connector)
295 {
296 }
297
298 static const struct drm_connector_funcs vidi_connector_funcs = {
299 .fill_modes = drm_helper_probe_single_connector_modes,
300 .detect = vidi_detect,
301 .destroy = vidi_connector_destroy,
302 .reset = drm_atomic_helper_connector_reset,
303 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
304 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
305 };
306
vidi_get_modes(struct drm_connector * connector)307 static int vidi_get_modes(struct drm_connector *connector)
308 {
309 struct vidi_context *ctx = ctx_from_connector(connector);
310 struct edid *edid;
311 int edid_len;
312 int count;
313
314 /*
315 * the edid data comes from user side and it would be set
316 * to ctx->raw_edid through specific ioctl.
317 */
318 if (!ctx->raw_edid) {
319 DRM_DEV_DEBUG_KMS(ctx->dev, "raw_edid is null.\n");
320 return 0;
321 }
322
323 edid_len = (1 + ctx->raw_edid->extensions) * EDID_LENGTH;
324 edid = kmemdup(ctx->raw_edid, edid_len, GFP_KERNEL);
325 if (!edid) {
326 DRM_DEV_DEBUG_KMS(ctx->dev, "failed to allocate edid\n");
327 return 0;
328 }
329
330 drm_connector_update_edid_property(connector, edid);
331
332 count = drm_add_edid_modes(connector, edid);
333
334 kfree(edid);
335
336 return count;
337 }
338
339 static const struct drm_connector_helper_funcs vidi_connector_helper_funcs = {
340 .get_modes = vidi_get_modes,
341 };
342
vidi_create_connector(struct drm_encoder * encoder)343 static int vidi_create_connector(struct drm_encoder *encoder)
344 {
345 struct vidi_context *ctx = encoder_to_vidi(encoder);
346 struct drm_connector *connector = &ctx->connector;
347 int ret;
348
349 connector->polled = DRM_CONNECTOR_POLL_HPD;
350
351 ret = drm_connector_init(ctx->drm_dev, connector,
352 &vidi_connector_funcs, DRM_MODE_CONNECTOR_VIRTUAL);
353 if (ret) {
354 DRM_DEV_ERROR(ctx->dev,
355 "Failed to initialize connector with drm\n");
356 return ret;
357 }
358
359 drm_connector_helper_add(connector, &vidi_connector_helper_funcs);
360 drm_connector_attach_encoder(connector, encoder);
361
362 return 0;
363 }
364
exynos_vidi_mode_set(struct drm_encoder * encoder,struct drm_display_mode * mode,struct drm_display_mode * adjusted_mode)365 static void exynos_vidi_mode_set(struct drm_encoder *encoder,
366 struct drm_display_mode *mode,
367 struct drm_display_mode *adjusted_mode)
368 {
369 }
370
exynos_vidi_enable(struct drm_encoder * encoder)371 static void exynos_vidi_enable(struct drm_encoder *encoder)
372 {
373 }
374
exynos_vidi_disable(struct drm_encoder * encoder)375 static void exynos_vidi_disable(struct drm_encoder *encoder)
376 {
377 }
378
379 static const struct drm_encoder_helper_funcs exynos_vidi_encoder_helper_funcs = {
380 .mode_set = exynos_vidi_mode_set,
381 .enable = exynos_vidi_enable,
382 .disable = exynos_vidi_disable,
383 };
384
vidi_bind(struct device * dev,struct device * master,void * data)385 static int vidi_bind(struct device *dev, struct device *master, void *data)
386 {
387 struct vidi_context *ctx = dev_get_drvdata(dev);
388 struct drm_device *drm_dev = data;
389 struct drm_encoder *encoder = &ctx->encoder;
390 struct exynos_drm_plane *exynos_plane;
391 struct exynos_drm_plane_config plane_config = { 0 };
392 unsigned int i;
393 int ret;
394
395 ctx->drm_dev = drm_dev;
396
397 plane_config.pixel_formats = formats;
398 plane_config.num_pixel_formats = ARRAY_SIZE(formats);
399
400 for (i = 0; i < WINDOWS_NR; i++) {
401 plane_config.zpos = i;
402 plane_config.type = vidi_win_types[i];
403
404 ret = exynos_plane_init(drm_dev, &ctx->planes[i], i,
405 &plane_config);
406 if (ret)
407 return ret;
408 }
409
410 exynos_plane = &ctx->planes[DEFAULT_WIN];
411 ctx->crtc = exynos_drm_crtc_create(drm_dev, &exynos_plane->base,
412 EXYNOS_DISPLAY_TYPE_VIDI, &vidi_crtc_ops, ctx);
413 if (IS_ERR(ctx->crtc)) {
414 DRM_DEV_ERROR(dev, "failed to create crtc.\n");
415 return PTR_ERR(ctx->crtc);
416 }
417
418 drm_simple_encoder_init(drm_dev, encoder, DRM_MODE_ENCODER_TMDS);
419
420 drm_encoder_helper_add(encoder, &exynos_vidi_encoder_helper_funcs);
421
422 ret = exynos_drm_set_possible_crtcs(encoder, EXYNOS_DISPLAY_TYPE_VIDI);
423 if (ret < 0)
424 return ret;
425
426 ret = vidi_create_connector(encoder);
427 if (ret) {
428 DRM_DEV_ERROR(dev, "failed to create connector ret = %d\n",
429 ret);
430 drm_encoder_cleanup(encoder);
431 return ret;
432 }
433
434 return 0;
435 }
436
437
vidi_unbind(struct device * dev,struct device * master,void * data)438 static void vidi_unbind(struct device *dev, struct device *master, void *data)
439 {
440 struct vidi_context *ctx = dev_get_drvdata(dev);
441
442 del_timer_sync(&ctx->timer);
443 }
444
445 static const struct component_ops vidi_component_ops = {
446 .bind = vidi_bind,
447 .unbind = vidi_unbind,
448 };
449
vidi_probe(struct platform_device * pdev)450 static int vidi_probe(struct platform_device *pdev)
451 {
452 struct vidi_context *ctx;
453 struct device *dev = &pdev->dev;
454
455 ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
456 if (!ctx)
457 return -ENOMEM;
458
459 ctx->dev = dev;
460
461 timer_setup(&ctx->timer, vidi_fake_vblank_timer, 0);
462
463 mutex_init(&ctx->lock);
464
465 platform_set_drvdata(pdev, ctx);
466
467 return component_add(dev, &vidi_component_ops);
468 }
469
vidi_remove(struct platform_device * pdev)470 static int vidi_remove(struct platform_device *pdev)
471 {
472 struct vidi_context *ctx = platform_get_drvdata(pdev);
473
474 if (ctx->raw_edid != (struct edid *)fake_edid_info) {
475 kfree(ctx->raw_edid);
476 ctx->raw_edid = NULL;
477 }
478
479 component_del(&pdev->dev, &vidi_component_ops);
480
481 return 0;
482 }
483
484 struct platform_driver vidi_driver = {
485 .probe = vidi_probe,
486 .remove = vidi_remove,
487 .driver = {
488 .name = "exynos-drm-vidi",
489 .owner = THIS_MODULE,
490 .dev_groups = vidi_groups,
491 },
492 };
493