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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_probe_helper.h>
17#include <drm/drm_vblank.h>
18#include <drm/exynos_drm.h>
19
20#include "exynos_drm_crtc.h"
21#include "exynos_drm_drv.h"
22#include "exynos_drm_fb.h"
23#include "exynos_drm_plane.h"
24#include "exynos_drm_vidi.h"
25
26/* VIDI uses fixed refresh rate of 50Hz */
27#define VIDI_REFRESH_TIME (1000 / 50)
28
29/* vidi has totally three virtual windows. */
30#define WINDOWS_NR 3
31
32#define ctx_from_connector(c) container_of(c, struct vidi_context, \
33 connector)
34
35struct vidi_context {
36 struct drm_encoder encoder;
37 struct drm_device *drm_dev;
38 struct device *dev;
39 struct exynos_drm_crtc *crtc;
40 struct drm_connector connector;
41 struct exynos_drm_plane planes[WINDOWS_NR];
42 struct edid *raw_edid;
43 unsigned int clkdiv;
44 unsigned int connected;
45 bool suspended;
46 struct timer_list timer;
47 struct mutex lock;
48};
49
50static inline struct vidi_context *encoder_to_vidi(struct drm_encoder *e)
51{
52 return container_of(e, struct vidi_context, encoder);
53}
54
55static const char fake_edid_info[] = {
56 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x4c, 0x2d, 0x05, 0x05,
57 0x00, 0x00, 0x00, 0x00, 0x30, 0x12, 0x01, 0x03, 0x80, 0x10, 0x09, 0x78,
58 0x0a, 0xee, 0x91, 0xa3, 0x54, 0x4c, 0x99, 0x26, 0x0f, 0x50, 0x54, 0xbd,
59 0xee, 0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
60 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x66, 0x21, 0x50, 0xb0, 0x51, 0x00,
61 0x1b, 0x30, 0x40, 0x70, 0x36, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e,
62 0x01, 0x1d, 0x00, 0x72, 0x51, 0xd0, 0x1e, 0x20, 0x6e, 0x28, 0x55, 0x00,
63 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x18,
64 0x4b, 0x1a, 0x44, 0x17, 0x00, 0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
65 0x00, 0x00, 0x00, 0xfc, 0x00, 0x53, 0x41, 0x4d, 0x53, 0x55, 0x4e, 0x47,
66 0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x01, 0xbc, 0x02, 0x03, 0x1e, 0xf1,
67 0x46, 0x84, 0x05, 0x03, 0x10, 0x20, 0x22, 0x23, 0x09, 0x07, 0x07, 0x83,
68 0x01, 0x00, 0x00, 0xe2, 0x00, 0x0f, 0x67, 0x03, 0x0c, 0x00, 0x10, 0x00,
69 0xb8, 0x2d, 0x01, 0x1d, 0x80, 0x18, 0x71, 0x1c, 0x16, 0x20, 0x58, 0x2c,
70 0x25, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x9e, 0x8c, 0x0a, 0xd0, 0x8a,
71 0x20, 0xe0, 0x2d, 0x10, 0x10, 0x3e, 0x96, 0x00, 0xa0, 0x5a, 0x00, 0x00,
72 0x00, 0x18, 0x02, 0x3a, 0x80, 0x18, 0x71, 0x38, 0x2d, 0x40, 0x58, 0x2c,
73 0x45, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e, 0x00, 0x00, 0x00, 0x00,
74 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
75 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
76 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
77 0x00, 0x00, 0x00, 0x06
78};
79
80static const uint32_t formats[] = {
81 DRM_FORMAT_XRGB8888,
82 DRM_FORMAT_ARGB8888,
83 DRM_FORMAT_NV12,
84};
85
86static const enum drm_plane_type vidi_win_types[WINDOWS_NR] = {
87 DRM_PLANE_TYPE_PRIMARY,
88 DRM_PLANE_TYPE_OVERLAY,
89 DRM_PLANE_TYPE_CURSOR,
90};
91
92static int vidi_enable_vblank(struct exynos_drm_crtc *crtc)
93{
94 struct vidi_context *ctx = crtc->ctx;
95
96 if (ctx->suspended)
97 return -EPERM;
98
99 mod_timer(&ctx->timer,
100 jiffies + msecs_to_jiffies(VIDI_REFRESH_TIME) - 1);
101
102 return 0;
103}
104
105static void vidi_disable_vblank(struct exynos_drm_crtc *crtc)
106{
107}
108
109static void vidi_update_plane(struct exynos_drm_crtc *crtc,
110 struct exynos_drm_plane *plane)
111{
112 struct drm_plane_state *state = plane->base.state;
113 struct vidi_context *ctx = crtc->ctx;
114 dma_addr_t addr;
115
116 if (ctx->suspended)
117 return;
118
119 addr = exynos_drm_fb_dma_addr(state->fb, 0);
120 DRM_DEV_DEBUG_KMS(ctx->dev, "dma_addr = %pad\n", &addr);
121}
122
123static void vidi_enable(struct exynos_drm_crtc *crtc)
124{
125 struct vidi_context *ctx = crtc->ctx;
126
127 mutex_lock(&ctx->lock);
128
129 ctx->suspended = false;
130
131 mutex_unlock(&ctx->lock);
132
133 drm_crtc_vblank_on(&crtc->base);
134}
135
136static void vidi_disable(struct exynos_drm_crtc *crtc)
137{
138 struct vidi_context *ctx = crtc->ctx;
139
140 drm_crtc_vblank_off(&crtc->base);
141
142 mutex_lock(&ctx->lock);
143
144 ctx->suspended = true;
145
146 mutex_unlock(&ctx->lock);
147}
148
149static const struct exynos_drm_crtc_ops vidi_crtc_ops = {
150 .enable = vidi_enable,
151 .disable = vidi_disable,
152 .enable_vblank = vidi_enable_vblank,
153 .disable_vblank = vidi_disable_vblank,
154 .update_plane = vidi_update_plane,
155 .atomic_flush = exynos_crtc_handle_event,
156};
157
158static void vidi_fake_vblank_timer(struct timer_list *t)
159{
160 struct vidi_context *ctx = from_timer(ctx, t, timer);
161
162 if (drm_crtc_handle_vblank(&ctx->crtc->base))
163 mod_timer(&ctx->timer,
164 jiffies + msecs_to_jiffies(VIDI_REFRESH_TIME) - 1);
165}
166
167static ssize_t vidi_show_connection(struct device *dev,
168 struct device_attribute *attr, char *buf)
169{
170 struct vidi_context *ctx = dev_get_drvdata(dev);
171 int rc;
172
173 mutex_lock(&ctx->lock);
174
175 rc = sprintf(buf, "%d\n", ctx->connected);
176
177 mutex_unlock(&ctx->lock);
178
179 return rc;
180}
181
182static ssize_t vidi_store_connection(struct device *dev,
183 struct device_attribute *attr,
184 const char *buf, size_t len)
185{
186 struct vidi_context *ctx = dev_get_drvdata(dev);
187 int ret;
188
189 ret = kstrtoint(buf, 0, &ctx->connected);
190 if (ret)
191 return ret;
192
193 if (ctx->connected > 1)
194 return -EINVAL;
195
196 /* use fake edid data for test. */
197 if (!ctx->raw_edid)
198 ctx->raw_edid = (struct edid *)fake_edid_info;
199
200 /* if raw_edid isn't same as fake data then it can't be tested. */
201 if (ctx->raw_edid != (struct edid *)fake_edid_info) {
202 DRM_DEV_DEBUG_KMS(dev, "edid data is not fake data.\n");
203 return -EINVAL;
204 }
205
206 DRM_DEV_DEBUG_KMS(dev, "requested connection.\n");
207
208 drm_helper_hpd_irq_event(ctx->drm_dev);
209
210 return len;
211}
212
213static DEVICE_ATTR(connection, 0644, vidi_show_connection,
214 vidi_store_connection);
215
216int vidi_connection_ioctl(struct drm_device *drm_dev, void *data,
217 struct drm_file *file_priv)
218{
219 struct vidi_context *ctx = dev_get_drvdata(drm_dev->dev);
220 struct drm_exynos_vidi_connection *vidi = data;
221
222 if (!vidi) {
223 DRM_DEV_DEBUG_KMS(ctx->dev,
224 "user data for vidi is null.\n");
225 return -EINVAL;
226 }
227
228 if (vidi->connection > 1) {
229 DRM_DEV_DEBUG_KMS(ctx->dev,
230 "connection should be 0 or 1.\n");
231 return -EINVAL;
232 }
233
234 if (ctx->connected == vidi->connection) {
235 DRM_DEV_DEBUG_KMS(ctx->dev,
236 "same connection request.\n");
237 return -EINVAL;
238 }
239
240 if (vidi->connection) {
241 struct edid *raw_edid;
242
243 raw_edid = (struct edid *)(unsigned long)vidi->edid;
244 if (!drm_edid_is_valid(raw_edid)) {
245 DRM_DEV_DEBUG_KMS(ctx->dev,
246 "edid data is invalid.\n");
247 return -EINVAL;
248 }
249 ctx->raw_edid = drm_edid_duplicate(raw_edid);
250 if (!ctx->raw_edid) {
251 DRM_DEV_DEBUG_KMS(ctx->dev,
252 "failed to allocate raw_edid.\n");
253 return -ENOMEM;
254 }
255 } else {
256 /*
257 * with connection = 0, free raw_edid
258 * only if raw edid data isn't same as fake data.
259 */
260 if (ctx->raw_edid && ctx->raw_edid !=
261 (struct edid *)fake_edid_info) {
262 kfree(ctx->raw_edid);
263 ctx->raw_edid = NULL;
264 }
265 }
266
267 ctx->connected = vidi->connection;
268 drm_helper_hpd_irq_event(ctx->drm_dev);
269
270 return 0;
271}
272
273static enum drm_connector_status vidi_detect(struct drm_connector *connector,
274 bool force)
275{
276 struct vidi_context *ctx = ctx_from_connector(connector);
277
278 /*
279 * connection request would come from user side
280 * to do hotplug through specific ioctl.
281 */
282 return ctx->connected ? connector_status_connected :
283 connector_status_disconnected;
284}
285
286static void vidi_connector_destroy(struct drm_connector *connector)
287{
288}
289
290static const struct drm_connector_funcs vidi_connector_funcs = {
291 .fill_modes = drm_helper_probe_single_connector_modes,
292 .detect = vidi_detect,
293 .destroy = vidi_connector_destroy,
294 .reset = drm_atomic_helper_connector_reset,
295 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
296 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
297};
298
299static int vidi_get_modes(struct drm_connector *connector)
300{
301 struct vidi_context *ctx = ctx_from_connector(connector);
302 struct edid *edid;
303 int edid_len;
304
305 /*
306 * the edid data comes from user side and it would be set
307 * to ctx->raw_edid through specific ioctl.
308 */
309 if (!ctx->raw_edid) {
310 DRM_DEV_DEBUG_KMS(ctx->dev, "raw_edid is null.\n");
311 return -EFAULT;
312 }
313
314 edid_len = (1 + ctx->raw_edid->extensions) * EDID_LENGTH;
315 edid = kmemdup(ctx->raw_edid, edid_len, GFP_KERNEL);
316 if (!edid) {
317 DRM_DEV_DEBUG_KMS(ctx->dev, "failed to allocate edid\n");
318 return -ENOMEM;
319 }
320
321 drm_connector_update_edid_property(connector, edid);
322
323 return drm_add_edid_modes(connector, edid);
324}
325
326static const struct drm_connector_helper_funcs vidi_connector_helper_funcs = {
327 .get_modes = vidi_get_modes,
328};
329
330static int vidi_create_connector(struct drm_encoder *encoder)
331{
332 struct vidi_context *ctx = encoder_to_vidi(encoder);
333 struct drm_connector *connector = &ctx->connector;
334 int ret;
335
336 connector->polled = DRM_CONNECTOR_POLL_HPD;
337
338 ret = drm_connector_init(ctx->drm_dev, connector,
339 &vidi_connector_funcs, DRM_MODE_CONNECTOR_VIRTUAL);
340 if (ret) {
341 DRM_DEV_ERROR(ctx->dev,
342 "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
352static 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
358static void exynos_vidi_enable(struct drm_encoder *encoder)
359{
360}
361
362static void exynos_vidi_disable(struct drm_encoder *encoder)
363{
364}
365
366static 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
372static const struct drm_encoder_funcs exynos_vidi_encoder_funcs = {
373 .destroy = drm_encoder_cleanup,
374};
375
376static 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_DEV_ERROR(dev, "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_DEV_ERROR(dev, "failed to create connector ret = %d\n",
421 ret);
422 drm_encoder_cleanup(encoder);
423 return ret;
424 }
425
426 return 0;
427}
428
429
430static void vidi_unbind(struct device *dev, struct device *master, void *data)
431{
432 struct vidi_context *ctx = dev_get_drvdata(dev);
433
434 del_timer_sync(&ctx->timer);
435}
436
437static const struct component_ops vidi_component_ops = {
438 .bind = vidi_bind,
439 .unbind = vidi_unbind,
440};
441
442static int vidi_probe(struct platform_device *pdev)
443{
444 struct vidi_context *ctx;
445 struct device *dev = &pdev->dev;
446 int ret;
447
448 ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
449 if (!ctx)
450 return -ENOMEM;
451
452 ctx->dev = dev;
453
454 timer_setup(&ctx->timer, vidi_fake_vblank_timer, 0);
455
456 mutex_init(&ctx->lock);
457
458 platform_set_drvdata(pdev, ctx);
459
460 ret = device_create_file(dev, &dev_attr_connection);
461 if (ret < 0) {
462 DRM_DEV_ERROR(dev,
463 "failed to create connection sysfs.\n");
464 return ret;
465 }
466
467 ret = component_add(dev, &vidi_component_ops);
468 if (ret)
469 goto err_remove_file;
470
471 return ret;
472
473err_remove_file:
474 device_remove_file(dev, &dev_attr_connection);
475
476 return ret;
477}
478
479static int vidi_remove(struct platform_device *pdev)
480{
481 struct vidi_context *ctx = platform_get_drvdata(pdev);
482
483 if (ctx->raw_edid != (struct edid *)fake_edid_info) {
484 kfree(ctx->raw_edid);
485 ctx->raw_edid = NULL;
486
487 return -EINVAL;
488 }
489
490 component_del(&pdev->dev, &vidi_component_ops);
491
492 return 0;
493}
494
495struct platform_driver vidi_driver = {
496 .probe = vidi_probe,
497 .remove = vidi_remove,
498 .driver = {
499 .name = "exynos-drm-vidi",
500 .owner = THIS_MODULE,
501 },
502};