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 const struct drm_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 /*
199 * Use fake edid data for test. If raw_edid is set then it can't be
200 * tested.
201 */
202 if (ctx->raw_edid) {
203 DRM_DEV_DEBUG_KMS(dev, "edid data is not fake data.\n");
204 return -EINVAL;
205 }
206
207 DRM_DEV_DEBUG_KMS(dev, "requested connection.\n");
208
209 drm_helper_hpd_irq_event(ctx->drm_dev);
210
211 return len;
212 }
213
214 static DEVICE_ATTR(connection, 0644, vidi_show_connection,
215 vidi_store_connection);
216
217 static struct attribute *vidi_attrs[] = {
218 &dev_attr_connection.attr,
219 NULL,
220 };
221 ATTRIBUTE_GROUPS(vidi);
222
vidi_connection_ioctl(struct drm_device * drm_dev,void * data,struct drm_file * file_priv)223 int vidi_connection_ioctl(struct drm_device *drm_dev, void *data,
224 struct drm_file *file_priv)
225 {
226 struct vidi_context *ctx = dev_get_drvdata(drm_dev->dev);
227 struct drm_exynos_vidi_connection *vidi = data;
228
229 if (!vidi) {
230 DRM_DEV_DEBUG_KMS(ctx->dev,
231 "user data for vidi is null.\n");
232 return -EINVAL;
233 }
234
235 if (vidi->connection > 1) {
236 DRM_DEV_DEBUG_KMS(ctx->dev,
237 "connection should be 0 or 1.\n");
238 return -EINVAL;
239 }
240
241 if (ctx->connected == vidi->connection) {
242 DRM_DEV_DEBUG_KMS(ctx->dev,
243 "same connection request.\n");
244 return -EINVAL;
245 }
246
247 if (vidi->connection) {
248 const struct drm_edid *drm_edid;
249 const struct edid *raw_edid;
250 size_t size;
251
252 raw_edid = (const struct edid *)(unsigned long)vidi->edid;
253 size = (raw_edid->extensions + 1) * EDID_LENGTH;
254
255 drm_edid = drm_edid_alloc(raw_edid, size);
256 if (!drm_edid)
257 return -ENOMEM;
258
259 if (!drm_edid_valid(drm_edid)) {
260 drm_edid_free(drm_edid);
261 DRM_DEV_DEBUG_KMS(ctx->dev,
262 "edid data is invalid.\n");
263 return -EINVAL;
264 }
265 ctx->raw_edid = drm_edid;
266 } else {
267 /* with connection = 0, free raw_edid */
268 drm_edid_free(ctx->raw_edid);
269 ctx->raw_edid = NULL;
270 }
271
272 ctx->connected = vidi->connection;
273 drm_helper_hpd_irq_event(ctx->drm_dev);
274
275 return 0;
276 }
277
vidi_detect(struct drm_connector * connector,bool force)278 static enum drm_connector_status vidi_detect(struct drm_connector *connector,
279 bool force)
280 {
281 struct vidi_context *ctx = ctx_from_connector(connector);
282
283 /*
284 * connection request would come from user side
285 * to do hotplug through specific ioctl.
286 */
287 return ctx->connected ? connector_status_connected :
288 connector_status_disconnected;
289 }
290
vidi_connector_destroy(struct drm_connector * connector)291 static void vidi_connector_destroy(struct drm_connector *connector)
292 {
293 }
294
295 static const struct drm_connector_funcs vidi_connector_funcs = {
296 .fill_modes = drm_helper_probe_single_connector_modes,
297 .detect = vidi_detect,
298 .destroy = vidi_connector_destroy,
299 .reset = drm_atomic_helper_connector_reset,
300 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
301 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
302 };
303
vidi_get_modes(struct drm_connector * connector)304 static int vidi_get_modes(struct drm_connector *connector)
305 {
306 struct vidi_context *ctx = ctx_from_connector(connector);
307 const struct drm_edid *drm_edid;
308 int count;
309
310 if (ctx->raw_edid)
311 drm_edid = drm_edid_dup(ctx->raw_edid);
312 else
313 drm_edid = drm_edid_alloc(fake_edid_info, sizeof(fake_edid_info));
314
315 if (!drm_edid)
316 return 0;
317
318 drm_edid_connector_update(connector, drm_edid);
319
320 count = drm_edid_connector_add_modes(connector);
321
322 drm_edid_free(drm_edid);
323
324 return count;
325 }
326
327 static const struct drm_connector_helper_funcs vidi_connector_helper_funcs = {
328 .get_modes = vidi_get_modes,
329 };
330
vidi_create_connector(struct drm_encoder * encoder)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_DEV_ERROR(ctx->dev,
343 "Failed to initialize connector with drm\n");
344 return ret;
345 }
346
347 drm_connector_helper_add(connector, &vidi_connector_helper_funcs);
348 drm_connector_attach_encoder(connector, encoder);
349
350 return 0;
351 }
352
exynos_vidi_mode_set(struct drm_encoder * encoder,struct drm_display_mode * mode,struct drm_display_mode * adjusted_mode)353 static void exynos_vidi_mode_set(struct drm_encoder *encoder,
354 struct drm_display_mode *mode,
355 struct drm_display_mode *adjusted_mode)
356 {
357 }
358
exynos_vidi_enable(struct drm_encoder * encoder)359 static void exynos_vidi_enable(struct drm_encoder *encoder)
360 {
361 }
362
exynos_vidi_disable(struct drm_encoder * encoder)363 static void exynos_vidi_disable(struct drm_encoder *encoder)
364 {
365 }
366
367 static const struct drm_encoder_helper_funcs exynos_vidi_encoder_helper_funcs = {
368 .mode_set = exynos_vidi_mode_set,
369 .enable = exynos_vidi_enable,
370 .disable = exynos_vidi_disable,
371 };
372
vidi_bind(struct device * dev,struct device * master,void * data)373 static int vidi_bind(struct device *dev, struct device *master, void *data)
374 {
375 struct vidi_context *ctx = dev_get_drvdata(dev);
376 struct drm_device *drm_dev = data;
377 struct drm_encoder *encoder = &ctx->encoder;
378 struct exynos_drm_plane *exynos_plane;
379 struct exynos_drm_plane_config plane_config = { 0 };
380 unsigned int i;
381 int ret;
382
383 ctx->drm_dev = drm_dev;
384
385 plane_config.pixel_formats = formats;
386 plane_config.num_pixel_formats = ARRAY_SIZE(formats);
387
388 for (i = 0; i < WINDOWS_NR; i++) {
389 plane_config.zpos = i;
390 plane_config.type = vidi_win_types[i];
391
392 ret = exynos_plane_init(drm_dev, &ctx->planes[i], i,
393 &plane_config);
394 if (ret)
395 return ret;
396 }
397
398 exynos_plane = &ctx->planes[DEFAULT_WIN];
399 ctx->crtc = exynos_drm_crtc_create(drm_dev, &exynos_plane->base,
400 EXYNOS_DISPLAY_TYPE_VIDI, &vidi_crtc_ops, ctx);
401 if (IS_ERR(ctx->crtc)) {
402 DRM_DEV_ERROR(dev, "failed to create crtc.\n");
403 return PTR_ERR(ctx->crtc);
404 }
405
406 drm_simple_encoder_init(drm_dev, encoder, DRM_MODE_ENCODER_TMDS);
407
408 drm_encoder_helper_add(encoder, &exynos_vidi_encoder_helper_funcs);
409
410 ret = exynos_drm_set_possible_crtcs(encoder, EXYNOS_DISPLAY_TYPE_VIDI);
411 if (ret < 0)
412 return ret;
413
414 ret = vidi_create_connector(encoder);
415 if (ret) {
416 DRM_DEV_ERROR(dev, "failed to create connector ret = %d\n",
417 ret);
418 drm_encoder_cleanup(encoder);
419 return ret;
420 }
421
422 return 0;
423 }
424
425
vidi_unbind(struct device * dev,struct device * master,void * data)426 static void vidi_unbind(struct device *dev, struct device *master, void *data)
427 {
428 struct vidi_context *ctx = dev_get_drvdata(dev);
429
430 del_timer_sync(&ctx->timer);
431 }
432
433 static const struct component_ops vidi_component_ops = {
434 .bind = vidi_bind,
435 .unbind = vidi_unbind,
436 };
437
vidi_probe(struct platform_device * pdev)438 static int vidi_probe(struct platform_device *pdev)
439 {
440 struct vidi_context *ctx;
441 struct device *dev = &pdev->dev;
442
443 ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
444 if (!ctx)
445 return -ENOMEM;
446
447 ctx->dev = dev;
448
449 timer_setup(&ctx->timer, vidi_fake_vblank_timer, 0);
450
451 mutex_init(&ctx->lock);
452
453 platform_set_drvdata(pdev, ctx);
454
455 return component_add(dev, &vidi_component_ops);
456 }
457
vidi_remove(struct platform_device * pdev)458 static void vidi_remove(struct platform_device *pdev)
459 {
460 struct vidi_context *ctx = platform_get_drvdata(pdev);
461
462 drm_edid_free(ctx->raw_edid);
463 ctx->raw_edid = NULL;
464
465 component_del(&pdev->dev, &vidi_component_ops);
466 }
467
468 struct platform_driver vidi_driver = {
469 .probe = vidi_probe,
470 .remove = vidi_remove,
471 .driver = {
472 .name = "exynos-drm-vidi",
473 .dev_groups = vidi_groups,
474 },
475 };
476