ACPI / LPSS: make code less confusing for reader
[deliverable/linux.git] / drivers / gpu / drm / exynos / exynos_drm_vidi.c
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/module.h>
17 #include <linux/platform_device.h>
18
19 #include <drm/exynos_drm.h>
20
21 #include <drm/drm_edid.h>
22 #include <drm/drm_crtc_helper.h>
23
24 #include "exynos_drm_drv.h"
25 #include "exynos_drm_crtc.h"
26 #include "exynos_drm_encoder.h"
27
28 /* vidi has totally three virtual windows. */
29 #define WINDOWS_NR 3
30
31 #define get_vidi_context(dev) platform_get_drvdata(to_platform_device(dev))
32
33 struct vidi_win_data {
34 unsigned int offset_x;
35 unsigned int offset_y;
36 unsigned int ovl_width;
37 unsigned int ovl_height;
38 unsigned int fb_width;
39 unsigned int fb_height;
40 unsigned int bpp;
41 dma_addr_t dma_addr;
42 unsigned int buf_offsize;
43 unsigned int line_size; /* bytes */
44 bool enabled;
45 };
46
47 struct vidi_context {
48 struct exynos_drm_subdrv subdrv;
49 struct drm_crtc *crtc;
50 struct vidi_win_data win_data[WINDOWS_NR];
51 struct edid *raw_edid;
52 unsigned int clkdiv;
53 unsigned int default_win;
54 unsigned long irq_flags;
55 unsigned int connected;
56 bool vblank_on;
57 bool suspended;
58 bool direct_vblank;
59 struct work_struct work;
60 struct mutex lock;
61 };
62
63 static const char fake_edid_info[] = {
64 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x4c, 0x2d, 0x05, 0x05,
65 0x00, 0x00, 0x00, 0x00, 0x30, 0x12, 0x01, 0x03, 0x80, 0x10, 0x09, 0x78,
66 0x0a, 0xee, 0x91, 0xa3, 0x54, 0x4c, 0x99, 0x26, 0x0f, 0x50, 0x54, 0xbd,
67 0xee, 0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
68 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x66, 0x21, 0x50, 0xb0, 0x51, 0x00,
69 0x1b, 0x30, 0x40, 0x70, 0x36, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e,
70 0x01, 0x1d, 0x00, 0x72, 0x51, 0xd0, 0x1e, 0x20, 0x6e, 0x28, 0x55, 0x00,
71 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x18,
72 0x4b, 0x1a, 0x44, 0x17, 0x00, 0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
73 0x00, 0x00, 0x00, 0xfc, 0x00, 0x53, 0x41, 0x4d, 0x53, 0x55, 0x4e, 0x47,
74 0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x01, 0xbc, 0x02, 0x03, 0x1e, 0xf1,
75 0x46, 0x84, 0x05, 0x03, 0x10, 0x20, 0x22, 0x23, 0x09, 0x07, 0x07, 0x83,
76 0x01, 0x00, 0x00, 0xe2, 0x00, 0x0f, 0x67, 0x03, 0x0c, 0x00, 0x10, 0x00,
77 0xb8, 0x2d, 0x01, 0x1d, 0x80, 0x18, 0x71, 0x1c, 0x16, 0x20, 0x58, 0x2c,
78 0x25, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x9e, 0x8c, 0x0a, 0xd0, 0x8a,
79 0x20, 0xe0, 0x2d, 0x10, 0x10, 0x3e, 0x96, 0x00, 0xa0, 0x5a, 0x00, 0x00,
80 0x00, 0x18, 0x02, 0x3a, 0x80, 0x18, 0x71, 0x38, 0x2d, 0x40, 0x58, 0x2c,
81 0x45, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e, 0x00, 0x00, 0x00, 0x00,
82 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
83 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
84 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
85 0x00, 0x00, 0x00, 0x06
86 };
87
88 static bool vidi_display_is_connected(struct device *dev)
89 {
90 struct vidi_context *ctx = get_vidi_context(dev);
91
92 DRM_DEBUG_KMS("%s\n", __FILE__);
93
94 /*
95 * connection request would come from user side
96 * to do hotplug through specific ioctl.
97 */
98 return ctx->connected ? true : false;
99 }
100
101 static struct edid *vidi_get_edid(struct device *dev,
102 struct drm_connector *connector)
103 {
104 struct vidi_context *ctx = get_vidi_context(dev);
105 struct edid *edid;
106 int edid_len;
107
108 DRM_DEBUG_KMS("%s\n", __FILE__);
109
110 /*
111 * the edid data comes from user side and it would be set
112 * to ctx->raw_edid through specific ioctl.
113 */
114 if (!ctx->raw_edid) {
115 DRM_DEBUG_KMS("raw_edid is null.\n");
116 return ERR_PTR(-EFAULT);
117 }
118
119 edid_len = (1 + ctx->raw_edid->extensions) * EDID_LENGTH;
120 edid = kzalloc(edid_len, GFP_KERNEL);
121 if (!edid) {
122 DRM_DEBUG_KMS("failed to allocate edid\n");
123 return ERR_PTR(-ENOMEM);
124 }
125
126 memcpy(edid, ctx->raw_edid, edid_len);
127 return edid;
128 }
129
130 static void *vidi_get_panel(struct device *dev)
131 {
132 DRM_DEBUG_KMS("%s\n", __FILE__);
133
134 /* TODO. */
135
136 return NULL;
137 }
138
139 static int vidi_check_timing(struct device *dev, void *timing)
140 {
141 DRM_DEBUG_KMS("%s\n", __FILE__);
142
143 /* TODO. */
144
145 return 0;
146 }
147
148 static int vidi_display_power_on(struct device *dev, int mode)
149 {
150 DRM_DEBUG_KMS("%s\n", __FILE__);
151
152 /* TODO */
153
154 return 0;
155 }
156
157 static struct exynos_drm_display_ops vidi_display_ops = {
158 .type = EXYNOS_DISPLAY_TYPE_VIDI,
159 .is_connected = vidi_display_is_connected,
160 .get_edid = vidi_get_edid,
161 .get_panel = vidi_get_panel,
162 .check_timing = vidi_check_timing,
163 .power_on = vidi_display_power_on,
164 };
165
166 static void vidi_dpms(struct device *subdrv_dev, int mode)
167 {
168 struct vidi_context *ctx = get_vidi_context(subdrv_dev);
169
170 DRM_DEBUG_KMS("%s, %d\n", __FILE__, mode);
171
172 mutex_lock(&ctx->lock);
173
174 switch (mode) {
175 case DRM_MODE_DPMS_ON:
176 /* TODO. */
177 break;
178 case DRM_MODE_DPMS_STANDBY:
179 case DRM_MODE_DPMS_SUSPEND:
180 case DRM_MODE_DPMS_OFF:
181 /* TODO. */
182 break;
183 default:
184 DRM_DEBUG_KMS("unspecified mode %d\n", mode);
185 break;
186 }
187
188 mutex_unlock(&ctx->lock);
189 }
190
191 static void vidi_apply(struct device *subdrv_dev)
192 {
193 struct vidi_context *ctx = get_vidi_context(subdrv_dev);
194 struct exynos_drm_manager *mgr = ctx->subdrv.manager;
195 struct exynos_drm_manager_ops *mgr_ops = mgr->ops;
196 struct exynos_drm_overlay_ops *ovl_ops = mgr->overlay_ops;
197 struct vidi_win_data *win_data;
198 int i;
199
200 DRM_DEBUG_KMS("%s\n", __FILE__);
201
202 for (i = 0; i < WINDOWS_NR; i++) {
203 win_data = &ctx->win_data[i];
204 if (win_data->enabled && (ovl_ops && ovl_ops->commit))
205 ovl_ops->commit(subdrv_dev, i);
206 }
207
208 if (mgr_ops && mgr_ops->commit)
209 mgr_ops->commit(subdrv_dev);
210 }
211
212 static void vidi_commit(struct device *dev)
213 {
214 struct vidi_context *ctx = get_vidi_context(dev);
215
216 DRM_DEBUG_KMS("%s\n", __FILE__);
217
218 if (ctx->suspended)
219 return;
220 }
221
222 static int vidi_enable_vblank(struct device *dev)
223 {
224 struct vidi_context *ctx = get_vidi_context(dev);
225
226 DRM_DEBUG_KMS("%s\n", __FILE__);
227
228 if (ctx->suspended)
229 return -EPERM;
230
231 if (!test_and_set_bit(0, &ctx->irq_flags))
232 ctx->vblank_on = true;
233
234 ctx->direct_vblank = true;
235
236 /*
237 * in case of page flip request, vidi_finish_pageflip function
238 * will not be called because direct_vblank is true and then
239 * that function will be called by overlay_ops->commit callback
240 */
241 schedule_work(&ctx->work);
242
243 return 0;
244 }
245
246 static void vidi_disable_vblank(struct device *dev)
247 {
248 struct vidi_context *ctx = get_vidi_context(dev);
249
250 DRM_DEBUG_KMS("%s\n", __FILE__);
251
252 if (ctx->suspended)
253 return;
254
255 if (test_and_clear_bit(0, &ctx->irq_flags))
256 ctx->vblank_on = false;
257 }
258
259 static struct exynos_drm_manager_ops vidi_manager_ops = {
260 .dpms = vidi_dpms,
261 .apply = vidi_apply,
262 .commit = vidi_commit,
263 .enable_vblank = vidi_enable_vblank,
264 .disable_vblank = vidi_disable_vblank,
265 };
266
267 static void vidi_win_mode_set(struct device *dev,
268 struct exynos_drm_overlay *overlay)
269 {
270 struct vidi_context *ctx = get_vidi_context(dev);
271 struct vidi_win_data *win_data;
272 int win;
273 unsigned long offset;
274
275 DRM_DEBUG_KMS("%s\n", __FILE__);
276
277 if (!overlay) {
278 dev_err(dev, "overlay is NULL\n");
279 return;
280 }
281
282 win = overlay->zpos;
283 if (win == DEFAULT_ZPOS)
284 win = ctx->default_win;
285
286 if (win < 0 || win > WINDOWS_NR)
287 return;
288
289 offset = overlay->fb_x * (overlay->bpp >> 3);
290 offset += overlay->fb_y * overlay->pitch;
291
292 DRM_DEBUG_KMS("offset = 0x%lx, pitch = %x\n", offset, overlay->pitch);
293
294 win_data = &ctx->win_data[win];
295
296 win_data->offset_x = overlay->crtc_x;
297 win_data->offset_y = overlay->crtc_y;
298 win_data->ovl_width = overlay->crtc_width;
299 win_data->ovl_height = overlay->crtc_height;
300 win_data->fb_width = overlay->fb_width;
301 win_data->fb_height = overlay->fb_height;
302 win_data->dma_addr = overlay->dma_addr[0] + offset;
303 win_data->bpp = overlay->bpp;
304 win_data->buf_offsize = (overlay->fb_width - overlay->crtc_width) *
305 (overlay->bpp >> 3);
306 win_data->line_size = overlay->crtc_width * (overlay->bpp >> 3);
307
308 /*
309 * some parts of win_data should be transferred to user side
310 * through specific ioctl.
311 */
312
313 DRM_DEBUG_KMS("offset_x = %d, offset_y = %d\n",
314 win_data->offset_x, win_data->offset_y);
315 DRM_DEBUG_KMS("ovl_width = %d, ovl_height = %d\n",
316 win_data->ovl_width, win_data->ovl_height);
317 DRM_DEBUG_KMS("paddr = 0x%lx\n", (unsigned long)win_data->dma_addr);
318 DRM_DEBUG_KMS("fb_width = %d, crtc_width = %d\n",
319 overlay->fb_width, overlay->crtc_width);
320 }
321
322 static void vidi_win_commit(struct device *dev, int zpos)
323 {
324 struct vidi_context *ctx = get_vidi_context(dev);
325 struct vidi_win_data *win_data;
326 int win = zpos;
327
328 DRM_DEBUG_KMS("%s\n", __FILE__);
329
330 if (ctx->suspended)
331 return;
332
333 if (win == DEFAULT_ZPOS)
334 win = ctx->default_win;
335
336 if (win < 0 || win > WINDOWS_NR)
337 return;
338
339 win_data = &ctx->win_data[win];
340
341 win_data->enabled = true;
342
343 DRM_DEBUG_KMS("dma_addr = 0x%x\n", win_data->dma_addr);
344
345 if (ctx->vblank_on)
346 schedule_work(&ctx->work);
347 }
348
349 static void vidi_win_disable(struct device *dev, int zpos)
350 {
351 struct vidi_context *ctx = get_vidi_context(dev);
352 struct vidi_win_data *win_data;
353 int win = zpos;
354
355 DRM_DEBUG_KMS("%s\n", __FILE__);
356
357 if (win == DEFAULT_ZPOS)
358 win = ctx->default_win;
359
360 if (win < 0 || win > WINDOWS_NR)
361 return;
362
363 win_data = &ctx->win_data[win];
364 win_data->enabled = false;
365
366 /* TODO. */
367 }
368
369 static struct exynos_drm_overlay_ops vidi_overlay_ops = {
370 .mode_set = vidi_win_mode_set,
371 .commit = vidi_win_commit,
372 .disable = vidi_win_disable,
373 };
374
375 static struct exynos_drm_manager vidi_manager = {
376 .pipe = -1,
377 .ops = &vidi_manager_ops,
378 .overlay_ops = &vidi_overlay_ops,
379 .display_ops = &vidi_display_ops,
380 };
381
382 static void vidi_fake_vblank_handler(struct work_struct *work)
383 {
384 struct vidi_context *ctx = container_of(work, struct vidi_context,
385 work);
386 struct exynos_drm_subdrv *subdrv = &ctx->subdrv;
387 struct exynos_drm_manager *manager = subdrv->manager;
388
389 if (manager->pipe < 0)
390 return;
391
392 /* refresh rate is about 50Hz. */
393 usleep_range(16000, 20000);
394
395 mutex_lock(&ctx->lock);
396
397 if (ctx->direct_vblank) {
398 drm_handle_vblank(subdrv->drm_dev, manager->pipe);
399 ctx->direct_vblank = false;
400 mutex_unlock(&ctx->lock);
401 return;
402 }
403
404 mutex_unlock(&ctx->lock);
405
406 exynos_drm_crtc_finish_pageflip(subdrv->drm_dev, manager->pipe);
407 }
408
409 static int vidi_subdrv_probe(struct drm_device *drm_dev, struct device *dev)
410 {
411 DRM_DEBUG_KMS("%s\n", __FILE__);
412
413 /*
414 * enable drm irq mode.
415 * - with irq_enabled = 1, we can use the vblank feature.
416 *
417 * P.S. note that we wouldn't use drm irq handler but
418 * just specific driver own one instead because
419 * drm framework supports only one irq handler.
420 */
421 drm_dev->irq_enabled = 1;
422
423 /*
424 * with vblank_disable_allowed = 1, vblank interrupt will be disabled
425 * by drm timer once a current process gives up ownership of
426 * vblank event.(after drm_vblank_put function is called)
427 */
428 drm_dev->vblank_disable_allowed = 1;
429
430 return 0;
431 }
432
433 static void vidi_subdrv_remove(struct drm_device *drm_dev, struct device *dev)
434 {
435 DRM_DEBUG_KMS("%s\n", __FILE__);
436
437 /* TODO. */
438 }
439
440 static int vidi_power_on(struct vidi_context *ctx, bool enable)
441 {
442 struct exynos_drm_subdrv *subdrv = &ctx->subdrv;
443 struct device *dev = subdrv->dev;
444
445 DRM_DEBUG_KMS("%s\n", __FILE__);
446
447 if (enable != false && enable != true)
448 return -EINVAL;
449
450 if (enable) {
451 ctx->suspended = false;
452
453 /* if vblank was enabled status, enable it again. */
454 if (test_and_clear_bit(0, &ctx->irq_flags))
455 vidi_enable_vblank(dev);
456
457 vidi_apply(dev);
458 } else {
459 ctx->suspended = true;
460 }
461
462 return 0;
463 }
464
465 static int vidi_show_connection(struct device *dev,
466 struct device_attribute *attr, char *buf)
467 {
468 int rc;
469 struct vidi_context *ctx = get_vidi_context(dev);
470
471 mutex_lock(&ctx->lock);
472
473 rc = sprintf(buf, "%d\n", ctx->connected);
474
475 mutex_unlock(&ctx->lock);
476
477 return rc;
478 }
479
480 static int vidi_store_connection(struct device *dev,
481 struct device_attribute *attr,
482 const char *buf, size_t len)
483 {
484 struct vidi_context *ctx = get_vidi_context(dev);
485 int ret;
486
487 DRM_DEBUG_KMS("%s\n", __FILE__);
488
489 ret = kstrtoint(buf, 0, &ctx->connected);
490 if (ret)
491 return ret;
492
493 if (ctx->connected > 1)
494 return -EINVAL;
495
496 /* use fake edid data for test. */
497 if (!ctx->raw_edid)
498 ctx->raw_edid = (struct edid *)fake_edid_info;
499
500 /* if raw_edid isn't same as fake data then it can't be tested. */
501 if (ctx->raw_edid != (struct edid *)fake_edid_info) {
502 DRM_DEBUG_KMS("edid data is not fake data.\n");
503 return -EINVAL;
504 }
505
506 DRM_DEBUG_KMS("requested connection.\n");
507
508 drm_helper_hpd_irq_event(ctx->subdrv.drm_dev);
509
510 return len;
511 }
512
513 static DEVICE_ATTR(connection, 0644, vidi_show_connection,
514 vidi_store_connection);
515
516 int vidi_connection_ioctl(struct drm_device *drm_dev, void *data,
517 struct drm_file *file_priv)
518 {
519 struct vidi_context *ctx = NULL;
520 struct drm_encoder *encoder;
521 struct exynos_drm_manager *manager;
522 struct exynos_drm_display_ops *display_ops;
523 struct drm_exynos_vidi_connection *vidi = data;
524 int edid_len;
525
526 DRM_DEBUG_KMS("%s\n", __FILE__);
527
528 if (!vidi) {
529 DRM_DEBUG_KMS("user data for vidi is null.\n");
530 return -EINVAL;
531 }
532
533 if (vidi->connection > 1) {
534 DRM_DEBUG_KMS("connection should be 0 or 1.\n");
535 return -EINVAL;
536 }
537
538 list_for_each_entry(encoder, &drm_dev->mode_config.encoder_list,
539 head) {
540 manager = exynos_drm_get_manager(encoder);
541 display_ops = manager->display_ops;
542
543 if (display_ops->type == EXYNOS_DISPLAY_TYPE_VIDI) {
544 ctx = get_vidi_context(manager->dev);
545 break;
546 }
547 }
548
549 if (!ctx) {
550 DRM_DEBUG_KMS("not found virtual device type encoder.\n");
551 return -EINVAL;
552 }
553
554 if (ctx->connected == vidi->connection) {
555 DRM_DEBUG_KMS("same connection request.\n");
556 return -EINVAL;
557 }
558
559 if (vidi->connection) {
560 struct edid *raw_edid = (struct edid *)(uint32_t)vidi->edid;
561 if (!drm_edid_is_valid(raw_edid)) {
562 DRM_DEBUG_KMS("edid data is invalid.\n");
563 return -EINVAL;
564 }
565 edid_len = (1 + raw_edid->extensions) * EDID_LENGTH;
566 ctx->raw_edid = kzalloc(edid_len, GFP_KERNEL);
567 if (!ctx->raw_edid) {
568 DRM_DEBUG_KMS("failed to allocate raw_edid.\n");
569 return -ENOMEM;
570 }
571 memcpy(ctx->raw_edid, raw_edid, edid_len);
572 } else {
573 /*
574 * with connection = 0, free raw_edid
575 * only if raw edid data isn't same as fake data.
576 */
577 if (ctx->raw_edid && ctx->raw_edid !=
578 (struct edid *)fake_edid_info) {
579 kfree(ctx->raw_edid);
580 ctx->raw_edid = NULL;
581 }
582 }
583
584 ctx->connected = vidi->connection;
585 drm_helper_hpd_irq_event(ctx->subdrv.drm_dev);
586
587 return 0;
588 }
589
590 static int vidi_probe(struct platform_device *pdev)
591 {
592 struct device *dev = &pdev->dev;
593 struct vidi_context *ctx;
594 struct exynos_drm_subdrv *subdrv;
595 int ret;
596
597 DRM_DEBUG_KMS("%s\n", __FILE__);
598
599 ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
600 if (!ctx)
601 return -ENOMEM;
602
603 ctx->default_win = 0;
604
605 INIT_WORK(&ctx->work, vidi_fake_vblank_handler);
606
607 subdrv = &ctx->subdrv;
608 subdrv->dev = dev;
609 subdrv->manager = &vidi_manager;
610 subdrv->probe = vidi_subdrv_probe;
611 subdrv->remove = vidi_subdrv_remove;
612
613 mutex_init(&ctx->lock);
614
615 platform_set_drvdata(pdev, ctx);
616
617 ret = device_create_file(&pdev->dev, &dev_attr_connection);
618 if (ret < 0)
619 DRM_INFO("failed to create connection sysfs.\n");
620
621 exynos_drm_subdrv_register(subdrv);
622
623 return 0;
624 }
625
626 static int vidi_remove(struct platform_device *pdev)
627 {
628 struct vidi_context *ctx = platform_get_drvdata(pdev);
629
630 DRM_DEBUG_KMS("%s\n", __FILE__);
631
632 exynos_drm_subdrv_unregister(&ctx->subdrv);
633
634 if (ctx->raw_edid != (struct edid *)fake_edid_info) {
635 kfree(ctx->raw_edid);
636 ctx->raw_edid = NULL;
637 }
638
639 return 0;
640 }
641
642 #ifdef CONFIG_PM_SLEEP
643 static int vidi_suspend(struct device *dev)
644 {
645 struct vidi_context *ctx = get_vidi_context(dev);
646
647 return vidi_power_on(ctx, false);
648 }
649
650 static int vidi_resume(struct device *dev)
651 {
652 struct vidi_context *ctx = get_vidi_context(dev);
653
654 return vidi_power_on(ctx, true);
655 }
656 #endif
657
658 static const struct dev_pm_ops vidi_pm_ops = {
659 SET_SYSTEM_SLEEP_PM_OPS(vidi_suspend, vidi_resume)
660 };
661
662 struct platform_driver vidi_driver = {
663 .probe = vidi_probe,
664 .remove = vidi_remove,
665 .driver = {
666 .name = "exynos-drm-vidi",
667 .owner = THIS_MODULE,
668 .pm = &vidi_pm_ops,
669 },
670 };
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