Version:  2.0.40 2.2.26 2.4.37 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1

Linux/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/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 
 24 #include "exynos_drm_drv.h"
 25 #include "exynos_drm_crtc.h"
 26 #include "exynos_drm_plane.h"
 27 #include "exynos_drm_encoder.h"
 28 #include "exynos_drm_vidi.h"
 29 
 30 /* vidi has totally three virtual windows. */
 31 #define WINDOWS_NR              3
 32 
 33 #define ctx_from_connector(c)   container_of(c, struct vidi_context, \
 34                                         connector)
 35 
 36 struct vidi_context {
 37         struct exynos_drm_display       display;
 38         struct platform_device          *pdev;
 39         struct drm_device               *drm_dev;
 40         struct exynos_drm_crtc          *crtc;
 41         struct drm_encoder              *encoder;
 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                    default_win;
 47         unsigned long                   irq_flags;
 48         unsigned int                    connected;
 49         bool                            vblank_on;
 50         bool                            suspended;
 51         bool                            direct_vblank;
 52         struct work_struct              work;
 53         struct mutex                    lock;
 54         int                             pipe;
 55 };
 56 
 57 static inline struct vidi_context *display_to_vidi(struct exynos_drm_display *d)
 58 {
 59         return container_of(d, struct vidi_context, display);
 60 }
 61 
 62 static const char fake_edid_info[] = {
 63         0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x4c, 0x2d, 0x05, 0x05,
 64         0x00, 0x00, 0x00, 0x00, 0x30, 0x12, 0x01, 0x03, 0x80, 0x10, 0x09, 0x78,
 65         0x0a, 0xee, 0x91, 0xa3, 0x54, 0x4c, 0x99, 0x26, 0x0f, 0x50, 0x54, 0xbd,
 66         0xee, 0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
 67         0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x66, 0x21, 0x50, 0xb0, 0x51, 0x00,
 68         0x1b, 0x30, 0x40, 0x70, 0x36, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e,
 69         0x01, 0x1d, 0x00, 0x72, 0x51, 0xd0, 0x1e, 0x20, 0x6e, 0x28, 0x55, 0x00,
 70         0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x18,
 71         0x4b, 0x1a, 0x44, 0x17, 0x00, 0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
 72         0x00, 0x00, 0x00, 0xfc, 0x00, 0x53, 0x41, 0x4d, 0x53, 0x55, 0x4e, 0x47,
 73         0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x01, 0xbc, 0x02, 0x03, 0x1e, 0xf1,
 74         0x46, 0x84, 0x05, 0x03, 0x10, 0x20, 0x22, 0x23, 0x09, 0x07, 0x07, 0x83,
 75         0x01, 0x00, 0x00, 0xe2, 0x00, 0x0f, 0x67, 0x03, 0x0c, 0x00, 0x10, 0x00,
 76         0xb8, 0x2d, 0x01, 0x1d, 0x80, 0x18, 0x71, 0x1c, 0x16, 0x20, 0x58, 0x2c,
 77         0x25, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x9e, 0x8c, 0x0a, 0xd0, 0x8a,
 78         0x20, 0xe0, 0x2d, 0x10, 0x10, 0x3e, 0x96, 0x00, 0xa0, 0x5a, 0x00, 0x00,
 79         0x00, 0x18, 0x02, 0x3a, 0x80, 0x18, 0x71, 0x38, 0x2d, 0x40, 0x58, 0x2c,
 80         0x45, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e, 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, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 84         0x00, 0x00, 0x00, 0x06
 85 };
 86 
 87 static int vidi_enable_vblank(struct exynos_drm_crtc *crtc)
 88 {
 89         struct vidi_context *ctx = crtc->ctx;
 90 
 91         if (ctx->suspended)
 92                 return -EPERM;
 93 
 94         if (!test_and_set_bit(0, &ctx->irq_flags))
 95                 ctx->vblank_on = true;
 96 
 97         ctx->direct_vblank = true;
 98 
 99         /*
100          * in case of page flip request, vidi_finish_pageflip function
101          * will not be called because direct_vblank is true and then
102          * that function will be called by crtc_ops->win_commit callback
103          */
104         schedule_work(&ctx->work);
105 
106         return 0;
107 }
108 
109 static void vidi_disable_vblank(struct exynos_drm_crtc *crtc)
110 {
111         struct vidi_context *ctx = crtc->ctx;
112 
113         if (ctx->suspended)
114                 return;
115 
116         if (test_and_clear_bit(0, &ctx->irq_flags))
117                 ctx->vblank_on = false;
118 }
119 
120 static void vidi_win_commit(struct exynos_drm_crtc *crtc, unsigned int win)
121 {
122         struct vidi_context *ctx = crtc->ctx;
123         struct exynos_drm_plane *plane;
124 
125         if (ctx->suspended)
126                 return;
127 
128         if (win < 0 || win >= WINDOWS_NR)
129                 return;
130 
131         plane = &ctx->planes[win];
132 
133         plane->enabled = true;
134 
135         DRM_DEBUG_KMS("dma_addr = %pad\n", plane->dma_addr);
136 
137         if (ctx->vblank_on)
138                 schedule_work(&ctx->work);
139 }
140 
141 static void vidi_win_disable(struct exynos_drm_crtc *crtc, unsigned int win)
142 {
143         struct vidi_context *ctx = crtc->ctx;
144         struct exynos_drm_plane *plane;
145 
146         if (win < 0 || win >= WINDOWS_NR)
147                 return;
148 
149         plane = &ctx->planes[win];
150         plane->enabled = false;
151 
152         /* TODO. */
153 }
154 
155 static int vidi_power_on(struct vidi_context *ctx, bool enable)
156 {
157         struct exynos_drm_plane *plane;
158         int i;
159 
160         DRM_DEBUG_KMS("%s\n", __FILE__);
161 
162         if (enable != false && enable != true)
163                 return -EINVAL;
164 
165         if (enable) {
166                 ctx->suspended = false;
167 
168                 /* if vblank was enabled status, enable it again. */
169                 if (test_and_clear_bit(0, &ctx->irq_flags))
170                         vidi_enable_vblank(ctx->crtc);
171 
172                 for (i = 0; i < WINDOWS_NR; i++) {
173                         plane = &ctx->planes[i];
174                         if (plane->enabled)
175                                 vidi_win_commit(ctx->crtc, i);
176                 }
177         } else {
178                 ctx->suspended = true;
179         }
180 
181         return 0;
182 }
183 
184 static void vidi_dpms(struct exynos_drm_crtc *crtc, int mode)
185 {
186         struct vidi_context *ctx = crtc->ctx;
187 
188         DRM_DEBUG_KMS("%d\n", mode);
189 
190         mutex_lock(&ctx->lock);
191 
192         switch (mode) {
193         case DRM_MODE_DPMS_ON:
194                 vidi_power_on(ctx, true);
195                 break;
196         case DRM_MODE_DPMS_STANDBY:
197         case DRM_MODE_DPMS_SUSPEND:
198         case DRM_MODE_DPMS_OFF:
199                 vidi_power_on(ctx, false);
200                 break;
201         default:
202                 DRM_DEBUG_KMS("unspecified mode %d\n", mode);
203                 break;
204         }
205 
206         mutex_unlock(&ctx->lock);
207 }
208 
209 static int vidi_ctx_initialize(struct vidi_context *ctx,
210                         struct drm_device *drm_dev)
211 {
212         struct exynos_drm_private *priv = drm_dev->dev_private;
213 
214         ctx->drm_dev = drm_dev;
215         ctx->pipe = priv->pipe++;
216 
217         return 0;
218 }
219 
220 static const struct exynos_drm_crtc_ops vidi_crtc_ops = {
221         .dpms = vidi_dpms,
222         .enable_vblank = vidi_enable_vblank,
223         .disable_vblank = vidi_disable_vblank,
224         .win_commit = vidi_win_commit,
225         .win_disable = vidi_win_disable,
226 };
227 
228 static void vidi_fake_vblank_handler(struct work_struct *work)
229 {
230         struct vidi_context *ctx = container_of(work, struct vidi_context,
231                                         work);
232 
233         if (ctx->pipe < 0)
234                 return;
235 
236         /* refresh rate is about 50Hz. */
237         usleep_range(16000, 20000);
238 
239         mutex_lock(&ctx->lock);
240 
241         if (ctx->direct_vblank) {
242                 drm_handle_vblank(ctx->drm_dev, ctx->pipe);
243                 ctx->direct_vblank = false;
244                 mutex_unlock(&ctx->lock);
245                 return;
246         }
247 
248         mutex_unlock(&ctx->lock);
249 
250         exynos_drm_crtc_finish_pageflip(ctx->drm_dev, ctx->pipe);
251 }
252 
253 static int vidi_show_connection(struct device *dev,
254                                 struct device_attribute *attr, char *buf)
255 {
256         struct vidi_context *ctx = dev_get_drvdata(dev);
257         int rc;
258 
259         mutex_lock(&ctx->lock);
260 
261         rc = sprintf(buf, "%d\n", ctx->connected);
262 
263         mutex_unlock(&ctx->lock);
264 
265         return rc;
266 }
267 
268 static int vidi_store_connection(struct device *dev,
269                                 struct device_attribute *attr,
270                                 const char *buf, size_t len)
271 {
272         struct vidi_context *ctx = dev_get_drvdata(dev);
273         int ret;
274 
275         ret = kstrtoint(buf, 0, &ctx->connected);
276         if (ret)
277                 return ret;
278 
279         if (ctx->connected > 1)
280                 return -EINVAL;
281 
282         /* use fake edid data for test. */
283         if (!ctx->raw_edid)
284                 ctx->raw_edid = (struct edid *)fake_edid_info;
285 
286         /* if raw_edid isn't same as fake data then it can't be tested. */
287         if (ctx->raw_edid != (struct edid *)fake_edid_info) {
288                 DRM_DEBUG_KMS("edid data is not fake data.\n");
289                 return -EINVAL;
290         }
291 
292         DRM_DEBUG_KMS("requested connection.\n");
293 
294         drm_helper_hpd_irq_event(ctx->drm_dev);
295 
296         return len;
297 }
298 
299 static DEVICE_ATTR(connection, 0644, vidi_show_connection,
300                         vidi_store_connection);
301 
302 int vidi_connection_ioctl(struct drm_device *drm_dev, void *data,
303                                 struct drm_file *file_priv)
304 {
305         struct vidi_context *ctx = NULL;
306         struct drm_encoder *encoder;
307         struct exynos_drm_display *display;
308         struct drm_exynos_vidi_connection *vidi = data;
309 
310         if (!vidi) {
311                 DRM_DEBUG_KMS("user data for vidi is null.\n");
312                 return -EINVAL;
313         }
314 
315         if (vidi->connection > 1) {
316                 DRM_DEBUG_KMS("connection should be 0 or 1.\n");
317                 return -EINVAL;
318         }
319 
320         list_for_each_entry(encoder, &drm_dev->mode_config.encoder_list,
321                                                                 head) {
322                 display = exynos_drm_get_display(encoder);
323 
324                 if (display->type == EXYNOS_DISPLAY_TYPE_VIDI) {
325                         ctx = display_to_vidi(display);
326                         break;
327                 }
328         }
329 
330         if (!ctx) {
331                 DRM_DEBUG_KMS("not found virtual device type encoder.\n");
332                 return -EINVAL;
333         }
334 
335         if (ctx->connected == vidi->connection) {
336                 DRM_DEBUG_KMS("same connection request.\n");
337                 return -EINVAL;
338         }
339 
340         if (vidi->connection) {
341                 struct edid *raw_edid  = (struct edid *)(uint32_t)vidi->edid;
342                 if (!drm_edid_is_valid(raw_edid)) {
343                         DRM_DEBUG_KMS("edid data is invalid.\n");
344                         return -EINVAL;
345                 }
346                 ctx->raw_edid = drm_edid_duplicate(raw_edid);
347                 if (!ctx->raw_edid) {
348                         DRM_DEBUG_KMS("failed to allocate raw_edid.\n");
349                         return -ENOMEM;
350                 }
351         } else {
352                 /*
353                  * with connection = 0, free raw_edid
354                  * only if raw edid data isn't same as fake data.
355                  */
356                 if (ctx->raw_edid && ctx->raw_edid !=
357                                 (struct edid *)fake_edid_info) {
358                         kfree(ctx->raw_edid);
359                         ctx->raw_edid = NULL;
360                 }
361         }
362 
363         ctx->connected = vidi->connection;
364         drm_helper_hpd_irq_event(ctx->drm_dev);
365 
366         return 0;
367 }
368 
369 static enum drm_connector_status vidi_detect(struct drm_connector *connector,
370                         bool force)
371 {
372         struct vidi_context *ctx = ctx_from_connector(connector);
373 
374         /*
375          * connection request would come from user side
376          * to do hotplug through specific ioctl.
377          */
378         return ctx->connected ? connector_status_connected :
379                         connector_status_disconnected;
380 }
381 
382 static void vidi_connector_destroy(struct drm_connector *connector)
383 {
384 }
385 
386 static struct drm_connector_funcs vidi_connector_funcs = {
387         .dpms = drm_helper_connector_dpms,
388         .fill_modes = drm_helper_probe_single_connector_modes,
389         .detect = vidi_detect,
390         .destroy = vidi_connector_destroy,
391 };
392 
393 static int vidi_get_modes(struct drm_connector *connector)
394 {
395         struct vidi_context *ctx = ctx_from_connector(connector);
396         struct edid *edid;
397         int edid_len;
398 
399         /*
400          * the edid data comes from user side and it would be set
401          * to ctx->raw_edid through specific ioctl.
402          */
403         if (!ctx->raw_edid) {
404                 DRM_DEBUG_KMS("raw_edid is null.\n");
405                 return -EFAULT;
406         }
407 
408         edid_len = (1 + ctx->raw_edid->extensions) * EDID_LENGTH;
409         edid = kmemdup(ctx->raw_edid, edid_len, GFP_KERNEL);
410         if (!edid) {
411                 DRM_DEBUG_KMS("failed to allocate edid\n");
412                 return -ENOMEM;
413         }
414 
415         drm_mode_connector_update_edid_property(connector, edid);
416 
417         return drm_add_edid_modes(connector, edid);
418 }
419 
420 static struct drm_encoder *vidi_best_encoder(struct drm_connector *connector)
421 {
422         struct vidi_context *ctx = ctx_from_connector(connector);
423 
424         return ctx->encoder;
425 }
426 
427 static struct drm_connector_helper_funcs vidi_connector_helper_funcs = {
428         .get_modes = vidi_get_modes,
429         .best_encoder = vidi_best_encoder,
430 };
431 
432 static int vidi_create_connector(struct exynos_drm_display *display,
433                                 struct drm_encoder *encoder)
434 {
435         struct vidi_context *ctx = display_to_vidi(display);
436         struct drm_connector *connector = &ctx->connector;
437         int ret;
438 
439         ctx->encoder = encoder;
440         connector->polled = DRM_CONNECTOR_POLL_HPD;
441 
442         ret = drm_connector_init(ctx->drm_dev, connector,
443                         &vidi_connector_funcs, DRM_MODE_CONNECTOR_VIRTUAL);
444         if (ret) {
445                 DRM_ERROR("Failed to initialize connector with drm\n");
446                 return ret;
447         }
448 
449         drm_connector_helper_add(connector, &vidi_connector_helper_funcs);
450         drm_connector_register(connector);
451         drm_mode_connector_attach_encoder(connector, encoder);
452 
453         return 0;
454 }
455 
456 
457 static struct exynos_drm_display_ops vidi_display_ops = {
458         .create_connector = vidi_create_connector,
459 };
460 
461 static int vidi_bind(struct device *dev, struct device *master, void *data)
462 {
463         struct vidi_context *ctx = dev_get_drvdata(dev);
464         struct drm_device *drm_dev = data;
465         struct exynos_drm_plane *exynos_plane;
466         enum drm_plane_type type;
467         unsigned int zpos;
468         int ret;
469 
470         vidi_ctx_initialize(ctx, drm_dev);
471 
472         for (zpos = 0; zpos < WINDOWS_NR; zpos++) {
473                 type = (zpos == ctx->default_win) ? DRM_PLANE_TYPE_PRIMARY :
474                                                 DRM_PLANE_TYPE_OVERLAY;
475                 ret = exynos_plane_init(drm_dev, &ctx->planes[zpos],
476                                         1 << ctx->pipe, type, zpos);
477                 if (ret)
478                         return ret;
479         }
480 
481         exynos_plane = &ctx->planes[ctx->default_win];
482         ctx->crtc = exynos_drm_crtc_create(drm_dev, &exynos_plane->base,
483                                            ctx->pipe, EXYNOS_DISPLAY_TYPE_VIDI,
484                                            &vidi_crtc_ops, ctx);
485         if (IS_ERR(ctx->crtc)) {
486                 DRM_ERROR("failed to create crtc.\n");
487                 return PTR_ERR(ctx->crtc);
488         }
489 
490         ret = exynos_drm_create_enc_conn(drm_dev, &ctx->display);
491         if (ret) {
492                 ctx->crtc->base.funcs->destroy(&ctx->crtc->base);
493                 return ret;
494         }
495 
496         return 0;
497 }
498 
499 
500 static void vidi_unbind(struct device *dev, struct device *master, void *data)
501 {
502 }
503 
504 static const struct component_ops vidi_component_ops = {
505         .bind   = vidi_bind,
506         .unbind = vidi_unbind,
507 };
508 
509 static int vidi_probe(struct platform_device *pdev)
510 {
511         struct vidi_context *ctx;
512         int ret;
513 
514         ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
515         if (!ctx)
516                 return -ENOMEM;
517 
518         ctx->display.type = EXYNOS_DISPLAY_TYPE_VIDI;
519         ctx->display.ops = &vidi_display_ops;
520         ctx->default_win = 0;
521         ctx->pdev = pdev;
522 
523         ret = exynos_drm_component_add(&pdev->dev, EXYNOS_DEVICE_TYPE_CRTC,
524                                         EXYNOS_DISPLAY_TYPE_VIDI);
525         if (ret)
526                 return ret;
527 
528         ret = exynos_drm_component_add(&pdev->dev, EXYNOS_DEVICE_TYPE_CONNECTOR,
529                                         ctx->display.type);
530         if (ret)
531                 goto err_del_crtc_component;
532 
533         INIT_WORK(&ctx->work, vidi_fake_vblank_handler);
534 
535         mutex_init(&ctx->lock);
536 
537         platform_set_drvdata(pdev, ctx);
538 
539         ret = device_create_file(&pdev->dev, &dev_attr_connection);
540         if (ret < 0) {
541                 DRM_ERROR("failed to create connection sysfs.\n");
542                 goto err_del_conn_component;
543         }
544 
545         ret = component_add(&pdev->dev, &vidi_component_ops);
546         if (ret)
547                 goto err_remove_file;
548 
549         return ret;
550 
551 err_remove_file:
552         device_remove_file(&pdev->dev, &dev_attr_connection);
553 err_del_conn_component:
554         exynos_drm_component_del(&pdev->dev, EXYNOS_DEVICE_TYPE_CONNECTOR);
555 err_del_crtc_component:
556         exynos_drm_component_del(&pdev->dev, EXYNOS_DEVICE_TYPE_CRTC);
557 
558         return ret;
559 }
560 
561 static int vidi_remove(struct platform_device *pdev)
562 {
563         struct vidi_context *ctx = platform_get_drvdata(pdev);
564 
565         if (ctx->raw_edid != (struct edid *)fake_edid_info) {
566                 kfree(ctx->raw_edid);
567                 ctx->raw_edid = NULL;
568 
569                 return -EINVAL;
570         }
571 
572         component_del(&pdev->dev, &vidi_component_ops);
573         exynos_drm_component_del(&pdev->dev, EXYNOS_DEVICE_TYPE_CONNECTOR);
574         exynos_drm_component_del(&pdev->dev, EXYNOS_DEVICE_TYPE_CRTC);
575 
576         return 0;
577 }
578 
579 struct platform_driver vidi_driver = {
580         .probe          = vidi_probe,
581         .remove         = vidi_remove,
582         .driver         = {
583                 .name   = "exynos-drm-vidi",
584                 .owner  = THIS_MODULE,
585         },
586 };
587 
588 int exynos_drm_probe_vidi(void)
589 {
590         struct platform_device *pdev;
591         int ret;
592 
593         pdev = platform_device_register_simple("exynos-drm-vidi", -1, NULL, 0);
594         if (IS_ERR(pdev))
595                 return PTR_ERR(pdev);
596 
597         ret = platform_driver_register(&vidi_driver);
598         if (ret) {
599                 platform_device_unregister(pdev);
600                 return ret;
601         }
602 
603         return ret;
604 }
605 
606 static int exynos_drm_remove_vidi_device(struct device *dev, void *data)
607 {
608         platform_device_unregister(to_platform_device(dev));
609 
610         return 0;
611 }
612 
613 void exynos_drm_remove_vidi(void)
614 {
615         int ret = driver_for_each_device(&vidi_driver.driver, NULL, NULL,
616                                          exynos_drm_remove_vidi_device);
617         /* silence compiler warning */
618         (void)ret;
619 
620         platform_driver_unregister(&vidi_driver);
621 }
622 

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