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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
37struct 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
56static inline struct vidi_context *encoder_to_vidi(struct drm_encoder *e)
57{
58 return container_of(e, struct vidi_context, encoder);
59}
60
61static 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
86static const uint32_t formats[] = {
87 DRM_FORMAT_XRGB8888,
88 DRM_FORMAT_ARGB8888,
89 DRM_FORMAT_NV12,
90};
91
92static 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
98static 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
120static 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
131static 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
148static 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
163static 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
174static 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
185static 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
193static 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
226static ssize_t 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
241static ssize_t 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
272static DEVICE_ATTR(connection, 0644, vidi_show_connection,
273 vidi_store_connection);
274
275int 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;
298
299 raw_edid = (struct edid *)(unsigned long)vidi->edid;
300 if (!drm_edid_is_valid(raw_edid)) {
301 DRM_DEBUG_KMS("edid data is invalid.\n");
302 return -EINVAL;
303 }
304 ctx->raw_edid = drm_edid_duplicate(raw_edid);
305 if (!ctx->raw_edid) {
306 DRM_DEBUG_KMS("failed to allocate raw_edid.\n");
307 return -ENOMEM;
308 }
309 } else {
310 /*
311 * with connection = 0, free raw_edid
312 * only if raw edid data isn't same as fake data.
313 */
314 if (ctx->raw_edid && ctx->raw_edid !=
315 (struct edid *)fake_edid_info) {
316 kfree(ctx->raw_edid);
317 ctx->raw_edid = NULL;
318 }
319 }
320
321 ctx->connected = vidi->connection;
322 drm_helper_hpd_irq_event(ctx->drm_dev);
323
324 return 0;
325}
326
327static enum drm_connector_status vidi_detect(struct drm_connector *connector,
328 bool force)
329{
330 struct vidi_context *ctx = ctx_from_connector(connector);
331
332 /*
333 * connection request would come from user side
334 * to do hotplug through specific ioctl.
335 */
336 return ctx->connected ? connector_status_connected :
337 connector_status_disconnected;
338}
339
340static void vidi_connector_destroy(struct drm_connector *connector)
341{
342}
343
344static const struct drm_connector_funcs vidi_connector_funcs = {
345 .dpms = drm_atomic_helper_connector_dpms,
346 .fill_modes = drm_helper_probe_single_connector_modes,
347 .detect = vidi_detect,
348 .destroy = vidi_connector_destroy,
349 .reset = drm_atomic_helper_connector_reset,
350 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
351 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
352};
353
354static int vidi_get_modes(struct drm_connector *connector)
355{
356 struct vidi_context *ctx = ctx_from_connector(connector);
357 struct edid *edid;
358 int edid_len;
359
360 /*
361 * the edid data comes from user side and it would be set
362 * to ctx->raw_edid through specific ioctl.
363 */
364 if (!ctx->raw_edid) {
365 DRM_DEBUG_KMS("raw_edid is null.\n");
366 return -EFAULT;
367 }
368
369 edid_len = (1 + ctx->raw_edid->extensions) * EDID_LENGTH;
370 edid = kmemdup(ctx->raw_edid, edid_len, GFP_KERNEL);
371 if (!edid) {
372 DRM_DEBUG_KMS("failed to allocate edid\n");
373 return -ENOMEM;
374 }
375
376 drm_mode_connector_update_edid_property(connector, edid);
377
378 return drm_add_edid_modes(connector, edid);
379}
380
381static struct drm_encoder *vidi_best_encoder(struct drm_connector *connector)
382{
383 struct vidi_context *ctx = ctx_from_connector(connector);
384
385 return &ctx->encoder;
386}
387
388static const struct drm_connector_helper_funcs vidi_connector_helper_funcs = {
389 .get_modes = vidi_get_modes,
390 .best_encoder = vidi_best_encoder,
391};
392
393static int vidi_create_connector(struct drm_encoder *encoder)
394{
395 struct vidi_context *ctx = encoder_to_vidi(encoder);
396 struct drm_connector *connector = &ctx->connector;
397 int ret;
398
399 connector->polled = DRM_CONNECTOR_POLL_HPD;
400
401 ret = drm_connector_init(ctx->drm_dev, connector,
402 &vidi_connector_funcs, DRM_MODE_CONNECTOR_VIRTUAL);
403 if (ret) {
404 DRM_ERROR("Failed to initialize connector with drm\n");
405 return ret;
406 }
407
408 drm_connector_helper_add(connector, &vidi_connector_helper_funcs);
409 drm_connector_register(connector);
410 drm_mode_connector_attach_encoder(connector, encoder);
411
412 return 0;
413}
414
415static void exynos_vidi_mode_set(struct drm_encoder *encoder,
416 struct drm_display_mode *mode,
417 struct drm_display_mode *adjusted_mode)
418{
419}
420
421static void exynos_vidi_enable(struct drm_encoder *encoder)
422{
423}
424
425static void exynos_vidi_disable(struct drm_encoder *encoder)
426{
427}
428
429static const struct drm_encoder_helper_funcs exynos_vidi_encoder_helper_funcs = {
430 .mode_set = exynos_vidi_mode_set,
431 .enable = exynos_vidi_enable,
432 .disable = exynos_vidi_disable,
433};
434
435static const struct drm_encoder_funcs exynos_vidi_encoder_funcs = {
436 .destroy = drm_encoder_cleanup,
437};
438
439static int vidi_bind(struct device *dev, struct device *master, void *data)
440{
441 struct vidi_context *ctx = dev_get_drvdata(dev);
442 struct drm_device *drm_dev = data;
443 struct drm_encoder *encoder = &ctx->encoder;
444 struct exynos_drm_plane *exynos_plane;
445 struct exynos_drm_plane_config plane_config = { 0 };
446 unsigned int i;
447 int pipe, ret;
448
449 vidi_ctx_initialize(ctx, drm_dev);
450
451 plane_config.pixel_formats = formats;
452 plane_config.num_pixel_formats = ARRAY_SIZE(formats);
453
454 for (i = 0; i < WINDOWS_NR; i++) {
455 plane_config.zpos = i;
456 plane_config.type = vidi_win_types[i];
457
458 ret = exynos_plane_init(drm_dev, &ctx->planes[i], i,
459 1 << ctx->pipe, &plane_config);
460 if (ret)
461 return ret;
462 }
463
464 exynos_plane = &ctx->planes[DEFAULT_WIN];
465 ctx->crtc = exynos_drm_crtc_create(drm_dev, &exynos_plane->base,
466 ctx->pipe, EXYNOS_DISPLAY_TYPE_VIDI,
467 &vidi_crtc_ops, ctx);
468 if (IS_ERR(ctx->crtc)) {
469 DRM_ERROR("failed to create crtc.\n");
470 return PTR_ERR(ctx->crtc);
471 }
472
473 pipe = exynos_drm_crtc_get_pipe_from_type(drm_dev,
474 EXYNOS_DISPLAY_TYPE_VIDI);
475 if (pipe < 0)
476 return pipe;
477
478 encoder->possible_crtcs = 1 << pipe;
479
480 DRM_DEBUG_KMS("possible_crtcs = 0x%x\n", encoder->possible_crtcs);
481
482 drm_encoder_init(drm_dev, encoder, &exynos_vidi_encoder_funcs,
483 DRM_MODE_ENCODER_TMDS, NULL);
484
485 drm_encoder_helper_add(encoder, &exynos_vidi_encoder_helper_funcs);
486
487 ret = vidi_create_connector(encoder);
488 if (ret) {
489 DRM_ERROR("failed to create connector ret = %d\n", ret);
490 drm_encoder_cleanup(encoder);
491 return ret;
492 }
493
494 return 0;
495}
496
497
498static void vidi_unbind(struct device *dev, struct device *master, void *data)
499{
500}
501
502static const struct component_ops vidi_component_ops = {
503 .bind = vidi_bind,
504 .unbind = vidi_unbind,
505};
506
507static int vidi_probe(struct platform_device *pdev)
508{
509 struct vidi_context *ctx;
510 int ret;
511
512 ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
513 if (!ctx)
514 return -ENOMEM;
515
516 ctx->pdev = pdev;
517
518 INIT_WORK(&ctx->work, vidi_fake_vblank_handler);
519
520 mutex_init(&ctx->lock);
521
522 platform_set_drvdata(pdev, ctx);
523
524 ret = device_create_file(&pdev->dev, &dev_attr_connection);
525 if (ret < 0) {
526 DRM_ERROR("failed to create connection sysfs.\n");
527 return ret;
528 }
529
530 ret = component_add(&pdev->dev, &vidi_component_ops);
531 if (ret)
532 goto err_remove_file;
533
534 return ret;
535
536err_remove_file:
537 device_remove_file(&pdev->dev, &dev_attr_connection);
538
539 return ret;
540}
541
542static int vidi_remove(struct platform_device *pdev)
543{
544 struct vidi_context *ctx = platform_get_drvdata(pdev);
545
546 if (ctx->raw_edid != (struct edid *)fake_edid_info) {
547 kfree(ctx->raw_edid);
548 ctx->raw_edid = NULL;
549
550 return -EINVAL;
551 }
552
553 component_del(&pdev->dev, &vidi_component_ops);
554
555 return 0;
556}
557
558struct platform_driver vidi_driver = {
559 .probe = vidi_probe,
560 .remove = vidi_remove,
561 .driver = {
562 .name = "exynos-drm-vidi",
563 .owner = THIS_MODULE,
564 },
565};